mirror of
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arm64/a64: Add driver for MIPI DSI
This PR adds the driver for Allwinner A64's MIPI Display Serial Interface (DSI) and MIPI Display Physical Layer (D-PHY). This driver will be used by the upcoming Display Driver for PINE64 PinePhone. - `include/nuttx/crc16.h`: Added 16-bit CRC-CCITT - `libs/libc/misc/Make.defs`: Added 16-bit CRC-CCITT to Makefile - `arch/arm64/src/a64/Kconfig`: Added the Kconfig option for "A64 Peripheral Selection > MIPI DSI" (`CONFIG_A64_MIPI_DSI`), which enables the MIPI DSI Driver - `arch/arm64/src/a64/hardware/a64_memorymap.h`: Added the Base Address for MIPI DSI - `arch/arm64/src/a64/Make.defs`: Added the MIPI DSI Driver to the Makefile - `libs/libc/misc/lib_crc16ccitt.c`: Compute 16-bit CRC-CCITT - `arch/arm64/src/a64/mipi_dsi.c`, `mipi_dsi.h`: Compose MIPI DSI Packets (Long, Short, Short with Parameter) - `arch/arm64/src/a64/a64_mipi_dsi.c`, `a64_mipi_dsi.h`: MIPI DSI Driver for Allwinner A64 - `arch/arm64/src/a64/a64_mipi_dphy.c`, `a64_mipi_dphy.h`: MIPI D-PHY Driver for Allwinner A64 - `platforms/arm/a64/boards/pinephone/index.rst`: Added MIPI DSI as supported peripheral for PinePhone Co-Authored-By: Petro Karashchenko <petro.karashchenko@gmail.com>
This commit is contained in:
Lee Lup Yuen
Xiang Xiao
@@ -145,6 +145,8 @@ NuttX for PinePhone supports these peripherals:
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=========== ======= =====
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=========== ======= =====
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Peripheral Support NOTES
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Peripheral Support NOTES
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=========== ======= =====
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=========== ======= =====
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MIPI D-PHY Yes
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MIPI DSI Yes
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PIO Yes
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PIO Yes
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UART Yes Only UART0 is supported
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UART Yes Only UART0 is supported
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=========== ======= =====
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=========== ======= =====
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@@ -6,10 +6,21 @@
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if ARCH_CHIP_A64
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if ARCH_CHIP_A64
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menu "Allwinner A64 Peripheral Selection"
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menu "Allwinner A64 Peripheral Selection"
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config A64_MIPI_DSI
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bool "MIPI DSI"
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default n
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---help---
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Select to enable support for MIPI Display Serial Interface (DSI)
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and MIPI Display Physical Layer (D-PHY).
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config A64_UART
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config A64_UART
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bool "UART"
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bool "UART"
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default n
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default n
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select UART1_SERIALDRIVER
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select UART1_SERIALDRIVER
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---help---
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Select to enable support for UART.
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endmenu # Allwinner A64 Peripheral Selection
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endmenu # Allwinner A64 Peripheral Selection
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endif # ARCH_CHIP_A64
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endif # ARCH_CHIP_A64
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@@ -23,4 +23,8 @@ include common/Make.defs
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# Allwinner A64 specific C source files
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# Allwinner A64 specific C source files
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CHIP_CSRCS = a64_boot.c a64_pio.c a64_serial.c
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CHIP_CSRCS = a64_boot.c a64_pio.c a64_serial.c
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ifeq ($(CONFIG_A64_MIPI_DSI),y)
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CHIP_CSRCS += a64_mipi_dphy.c a64_mipi_dsi.c mipi_dsi.c
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endif
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CHIP_ASRCS = a64_lowputc.S
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CHIP_ASRCS = a64_lowputc.S
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@@ -0,0 +1,162 @@
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/****************************************************************************
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* arch/arm64/src/a64/a64_mipi_dphy.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* Reference:
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*
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* "Understanding PinePhone's Display (MIPI DSI)"
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* https://lupyuen.github.io/articles/dsi
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*
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* "NuttX RTOS for PinePhone: Display Driver in Zig"
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* https://lupyuen.github.io/articles/dsi2
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*
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* "A64 Page" refers to Allwinner A64 User Manual
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* https://lupyuen.github.io/images/Allwinner_A64_User_Manual_V1.1.pdf
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include "arm64_arch.h"
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#include "a64_mipi_dphy.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* A64 CCU Registers and Bit Definitions ************************************/
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/* MIPI_DSI Clock Register */
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#define MIPI_DSI_CLK_REG (A64_CCU_ADDR + 0x168)
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#define DPHY_CLK_DIV_M(n) ((n) << 0)
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#define DSI_DPHY_SRC_SEL(n) ((n) << 8)
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#define DSI_DPHY_GATING (1 << 15)
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/* A64 MIPI D-PHY Registers (Undocumented) **********************************/
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#define DPHY_TX_CTL_REG (A64_DPHY_ADDR + 0x04)
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#define DPHY_TX_TIME0_REG (A64_DPHY_ADDR + 0x10)
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#define DPHY_TX_TIME1_REG (A64_DPHY_ADDR + 0x14)
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#define DPHY_TX_TIME2_REG (A64_DPHY_ADDR + 0x18)
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#define DPHY_TX_TIME3_REG (A64_DPHY_ADDR + 0x1c)
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#define DPHY_TX_TIME4_REG (A64_DPHY_ADDR + 0x20)
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#define DPHY_GCTL_REG (A64_DPHY_ADDR + 0x00)
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#define DPHY_ANA0_REG (A64_DPHY_ADDR + 0x4c)
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#define DPHY_ANA1_REG (A64_DPHY_ADDR + 0x50)
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#define DPHY_ANA4_REG (A64_DPHY_ADDR + 0x5c)
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#define DPHY_ANA2_REG (A64_DPHY_ADDR + 0x54)
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#define DPHY_ANA3_REG (A64_DPHY_ADDR + 0x58)
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/* A64 MIPI D-PHY Values (Undocumented) */
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#define ANA1_VTTMODE 0x80000000
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#define ANA2_ENABLECKCPU 0x10
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#define ANA2_ENABLEP2SCPU 0xf000000
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#define ANA3_ENABLEVTTC 0xf8000000
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#define ANA3_ENABLEDIV 0x4000000
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: a64_mipi_dphy_enable
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*
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* Description:
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* Enable MIPI Display Physical Layer (D-PHY).
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* OK is always returned at present.
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*
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****************************************************************************/
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int a64_mipi_dphy_enable(void)
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{
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uint32_t mipi_dsi_clk;
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/* Set DSI Clock to 150 MHz (600 MHz / 4) *********************************/
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ginfo("Set DSI Clock to 150 MHz\n");
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/* MIPI_DSI Clock Register
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* Set DSI_DPHY_GATING (Bit 15) to 1
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* (DSI DPHY Clock is On)
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* Set DSI_DPHY_SRC_SEL (Bits 8 to 9) to 0b10
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* (DSI DPHY Clock Source is PLL_PERIPH0(1X))
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* Set DPHY_CLK_DIV_M (Bits 0 to 3) to 3
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* (DSI DPHY Clock divide ratio - 1)
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*/
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mipi_dsi_clk = DSI_DPHY_GATING |
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DSI_DPHY_SRC_SEL(0b10) |
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DPHY_CLK_DIV_M(3);
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putreg32(mipi_dsi_clk, MIPI_DSI_CLK_REG);
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/* Power on DPHY Tx (Undocumented) ****************************************/
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ginfo("Power on DPHY Tx\n");
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putreg32(0x10000000, DPHY_TX_CTL_REG);
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putreg32(0xa06000e, DPHY_TX_TIME0_REG);
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putreg32(0xa033207, DPHY_TX_TIME1_REG);
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putreg32(0x1e, DPHY_TX_TIME2_REG);
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putreg32(0x0, DPHY_TX_TIME3_REG);
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putreg32(0x303, DPHY_TX_TIME4_REG);
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/* Enable DPHY (Undocumented) *********************************************/
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ginfo("Enable DPHY\n");
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putreg32(0x31, DPHY_GCTL_REG);
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putreg32(0x9f007f00, DPHY_ANA0_REG);
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putreg32(0x17000000, DPHY_ANA1_REG);
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putreg32(0x1f01555, DPHY_ANA4_REG);
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putreg32(0x2, DPHY_ANA2_REG);
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up_mdelay(1); /* Wait at least 5 microseconds */
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/* Enable LDOR, LDOC, LDOD (Undocumented) *********************************/
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ginfo("Enable LDOR, LDOC, LDOD\n");
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putreg32(0x3040000, DPHY_ANA3_REG);
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up_mdelay(1); /* Wait at least 1 microsecond */
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modreg32(ANA3_ENABLEVTTC, ANA3_ENABLEVTTC, DPHY_ANA3_REG);
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up_mdelay(1); /* Wait at least 1 microsecond */
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modreg32(ANA3_ENABLEDIV, ANA3_ENABLEDIV, DPHY_ANA3_REG);
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up_mdelay(1); /* Wait at least 1 microsecond */
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modreg32(ANA2_ENABLECKCPU, ANA2_ENABLECKCPU, DPHY_ANA2_REG);
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up_mdelay(1); /* Wait at least 1 microsecond */
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modreg32(ANA1_VTTMODE, ANA1_VTTMODE, DPHY_ANA1_REG);
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modreg32(ANA2_ENABLEP2SCPU, ANA2_ENABLEP2SCPU, DPHY_ANA2_REG);
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return OK;
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}
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@@ -0,0 +1,51 @@
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/****************************************************************************
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* arch/arm64/src/a64/a64_mipi_dphy.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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|
* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM64_SRC_A64_A64_MIPI_DPHY_H
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#define __ARCH_ARM64_SRC_A64_A64_MIPI_DPHY_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "hardware/a64_memorymap.h"
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: a64_mipi_dphy_enable
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*
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* Description:
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* Enable MIPI Display Physical Layer (D-PHY).
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* OK is always returned at present.
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*
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****************************************************************************/
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int a64_mipi_dphy_enable(void);
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#endif /* __ARCH_ARM64_SRC_A64_A64_MIPI_DPHY_H */
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File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,105 @@
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/****************************************************************************
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* arch/arm64/src/a64/a64_mipi_dsi.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
|
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|
* contributor license agreements. See the NOTICE file distributed with
|
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|
* this work for additional information regarding copyright ownership. The
|
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|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
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|
* "License"); you may not use this file except in compliance with the
|
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|
* License. You may obtain a copy of the License at
|
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|
*
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|
* http://www.apache.org/licenses/LICENSE-2.0
|
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|
*
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* Unless required by applicable law or agreed to in writing, software
|
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|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
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|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
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|
* License for the specific language governing permissions and limitations
|
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|
* under the License.
|
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|
*
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****************************************************************************/
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#ifndef __ARCH_ARM64_SRC_A64_A64_MIPI_DSI_H
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#define __ARCH_ARM64_SRC_A64_A64_MIPI_DSI_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "hardware/a64_memorymap.h"
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#include "mipi_dsi.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Virtual Channel to be used for data transfer on the MIPI DSI Bus */
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#define A64_MIPI_DSI_VIRTUAL_CHANNEL 0
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/****************************************************************************
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|
* Public Function Prototypes
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****************************************************************************/
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|
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/****************************************************************************
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* Name: a64_mipi_dsi_enable
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*
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* Description:
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* Enable the MIPI DSI Block on the SoC. Should be called before
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* transferring data on the MIPI DSI Bus.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* OK is always returned at present.
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*
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****************************************************************************/
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int a64_mipi_dsi_enable(void);
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/****************************************************************************
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* Name: a64_mipi_dsi_write
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*
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* Description:
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* Transmit the payload data to the MIPI DSI Bus as a MIPI DSI Short or
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* Long Packet. This function is called to initialize the LCD Controller.
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* Assumes that the MIPI DSI Block has been enabled on the SoC.
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*
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* Input Parameters:
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* channel - Virtual Channel
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* cmd - DCS Command (Data Type)
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* txbuf - Payload data for the packet
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* txlen - Length of payload data (Max 65541 bytes)
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*
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* Returned Value:
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||||||
|
* Number of bytes transmitted; a negated errno value is returned on any
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||||||
|
* failure.
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*
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****************************************************************************/
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||||||
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ssize_t a64_mipi_dsi_write(uint8_t channel,
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enum mipi_dsi_e cmd,
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FAR const uint8_t *txbuf,
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|
size_t txlen);
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|
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||||||
|
/****************************************************************************
|
||||||
|
* Name: a64_mipi_dsi_start
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||||||
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*
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||||||
|
* Description:
|
||||||
|
* Start the MIPI DSI Bus in High Speed Clock Mode (HSC) for High Speed
|
||||||
|
* Data Transmission (HSD). Should be called after initializing the LCD
|
||||||
|
* Controller, and before executing any Display Engine operations.
|
||||||
|
* Assumes that the MIPI DSI Block has been enabled on the SoC.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* None
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* OK is always returned at present.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
int a64_mipi_dsi_start(void);
|
||||||
|
|
||||||
|
#endif /* __ARCH_ARM64_SRC_A64_A64_MIPI_DSI_H */
|
||||||
@@ -33,7 +33,10 @@
|
|||||||
|
|
||||||
/* Peripheral Base Addresses */
|
/* Peripheral Base Addresses */
|
||||||
|
|
||||||
|
#define A64_CCU_ADDR 0x01c20000 /* CCU 0x01c2:0000-0x01c2:03ff 1K */
|
||||||
#define A64_PIO_ADDR 0x01c20800 /* PIO 0x01c2:0800-0x01c2:0bff 1K */
|
#define A64_PIO_ADDR 0x01c20800 /* PIO 0x01c2:0800-0x01c2:0bff 1K */
|
||||||
|
#define A64_DSI_ADDR 0x01ca0000 /* MIPI DSI 0x01ca:0000-0x01ca:0fff 4K */
|
||||||
|
#define A64_DPHY_ADDR 0x01ca1000 /* MIPI DSI-PHY 0x01ca:1000-0x01ca:1fff 4K */
|
||||||
#define A64_RPIO_ADDR 0x01f02c00 /* R_PIO 0x01f0:2c00-0x01f0:2fff 1K */
|
#define A64_RPIO_ADDR 0x01f02c00 /* R_PIO 0x01f0:2c00-0x01f0:2fff 1K */
|
||||||
|
|
||||||
/****************************************************************************
|
/****************************************************************************
|
||||||
|
|||||||
@@ -0,0 +1,386 @@
|
|||||||
|
/****************************************************************************
|
||||||
|
* arch/arm64/src/a64/mipi_dsi.c
|
||||||
|
*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
||||||
|
* contributor license agreements. See the NOTICE file distributed with
|
||||||
|
* this work for additional information regarding copyright ownership. The
|
||||||
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance with the
|
||||||
|
* License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||||
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||||
|
* License for the specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/* Reference:
|
||||||
|
*
|
||||||
|
* "Understanding PinePhone's Display (MIPI DSI)"
|
||||||
|
* https://lupyuen.github.io/articles/dsi
|
||||||
|
*
|
||||||
|
* "NuttX RTOS for PinePhone: Display Driver in Zig"
|
||||||
|
* https://lupyuen.github.io/articles/dsi2
|
||||||
|
*/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Included Files
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#include <nuttx/config.h>
|
||||||
|
#include <nuttx/crc16.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <assert.h>
|
||||||
|
#include <debug.h>
|
||||||
|
#include "mipi_dsi.h"
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Private Functions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: compute_crc
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Compute the MIPI DSI CRC for the data buffer.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* data - Data buffer
|
||||||
|
* len - Length of data buffer
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* MIPI DSI CRC value of the data buffer
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static uint16_t compute_crc(const uint8_t *data, size_t len)
|
||||||
|
{
|
||||||
|
uint16_t crc;
|
||||||
|
|
||||||
|
/* Compute CRC-16-CCITT (x^16+x^12+x^5+1) */
|
||||||
|
|
||||||
|
DEBUGASSERT(data != NULL);
|
||||||
|
crc = crc16ccittpart(data, len, 0xffff);
|
||||||
|
|
||||||
|
return crc;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: compute_ecc
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Compute the MIPI DSI Error Correction Code (ECC) for the 3-byte
|
||||||
|
* Packet Header. The ECC allows single-bit errors to be corrected and
|
||||||
|
* 2-bit errors to be detected in the MIPI DSI Packet Header.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* di_wc - Packet Header (Data Identifier + Word Count)
|
||||||
|
* len - Length of Packet Header (Should be 3 bytes)
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* MIPI DSI ECC value of the Packet Header
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
static uint8_t compute_ecc(const uint8_t *di_wc, size_t len)
|
||||||
|
{
|
||||||
|
uint32_t di_wc_word;
|
||||||
|
bool d[24];
|
||||||
|
bool ecc[8];
|
||||||
|
int i;
|
||||||
|
|
||||||
|
/* Packet Header should be exactly 3 bytes */
|
||||||
|
|
||||||
|
DEBUGASSERT(di_wc != NULL);
|
||||||
|
if (len != 3)
|
||||||
|
{
|
||||||
|
DEBUGPANIC();
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Combine Data Identifier and Word Count into a 24-bit word */
|
||||||
|
|
||||||
|
di_wc_word = di_wc[0] | (di_wc[1] << 8) | (di_wc[2] << 16);
|
||||||
|
|
||||||
|
/* Extract the 24 bits from the word */
|
||||||
|
|
||||||
|
memset(d, 0, sizeof(d));
|
||||||
|
for (i = 0; i < 24; i++)
|
||||||
|
{
|
||||||
|
d[i] = di_wc_word & 1;
|
||||||
|
di_wc_word >>= 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Compute the ECC bits */
|
||||||
|
|
||||||
|
memset(ecc, 0, sizeof(ecc));
|
||||||
|
ecc[7] = 0;
|
||||||
|
ecc[6] = 0;
|
||||||
|
ecc[5] = d[10] ^ d[11] ^ d[12] ^ d[13] ^ d[14] ^ d[15] ^ d[16] ^ d[17] ^
|
||||||
|
d[18] ^ d[19] ^ d[21] ^ d[22] ^ d[23];
|
||||||
|
ecc[4] = d[4] ^ d[5] ^ d[6] ^ d[7] ^ d[8] ^ d[9] ^ d[16] ^ d[17] ^
|
||||||
|
d[18] ^ d[19] ^ d[20] ^ d[22] ^ d[23];
|
||||||
|
ecc[3] = d[1] ^ d[2] ^ d[3] ^ d[7] ^ d[8] ^ d[9] ^ d[13] ^ d[14] ^
|
||||||
|
d[15] ^ d[19] ^ d[20] ^ d[21] ^ d[23];
|
||||||
|
ecc[2] = d[0] ^ d[2] ^ d[3] ^ d[5] ^ d[6] ^ d[9] ^ d[11] ^ d[12] ^
|
||||||
|
d[15] ^ d[18] ^ d[20] ^ d[21] ^ d[22];
|
||||||
|
ecc[1] = d[0] ^ d[1] ^ d[3] ^ d[4] ^ d[6] ^ d[8] ^ d[10] ^ d[12] ^
|
||||||
|
d[14] ^ d[17] ^ d[20] ^ d[21] ^ d[22] ^ d[23];
|
||||||
|
ecc[0] = d[0] ^ d[1] ^ d[2] ^ d[4] ^ d[5] ^ d[7] ^ d[10] ^ d[11] ^
|
||||||
|
d[13] ^ d[16] ^ d[20] ^ d[21] ^ d[22] ^ d[23];
|
||||||
|
|
||||||
|
/* Merge the ECC bits */
|
||||||
|
|
||||||
|
return ecc[0] | (ecc[1] << 1) | (ecc[2] << 2) | (ecc[3] << 3) |
|
||||||
|
(ecc[4] << 4) | (ecc[5] << 5) | (ecc[6] << 6) | (ecc[7] << 7);
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Functions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: mipi_dsi_long_packet
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Compose a MIPI DSI Long Packet. A Short Packet consists of Data
|
||||||
|
* Identifier (Virtual Channel + Data Type), Word Count (Payload Size),
|
||||||
|
* Error Correction Code, Payload and Checksum. Packet Length is
|
||||||
|
* Payload Size + 6 bytes.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* pktbuf - Buffer for the returned packet
|
||||||
|
* pktlen - Size of the packet buffer
|
||||||
|
* channel - Virtual Channel
|
||||||
|
* cmd - DCS Command (Data Type)
|
||||||
|
* txbuf - Payload data for the packet
|
||||||
|
* txlen - Length of payload data (Max 65541 bytes)
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Number of bytes in the returned packet; ERROR (-1) if packet buffer is
|
||||||
|
* too small for the packet
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
ssize_t mipi_dsi_long_packet(uint8_t *pktbuf,
|
||||||
|
size_t pktlen,
|
||||||
|
uint8_t channel,
|
||||||
|
enum mipi_dsi_e cmd,
|
||||||
|
const uint8_t *txbuf,
|
||||||
|
size_t txlen)
|
||||||
|
{
|
||||||
|
/* Data Identifier (DI) (1 byte):
|
||||||
|
* Virtual Channel Identifier (Bits 6 to 7)
|
||||||
|
* Data Type (Bits 0 to 5)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t vc = channel;
|
||||||
|
const uint8_t dt = cmd;
|
||||||
|
const uint8_t di = (vc << 6) | dt;
|
||||||
|
|
||||||
|
/* Word Count (WC) (2 bytes)：
|
||||||
|
* Number of bytes in the Packet Payload
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint16_t wc = txlen;
|
||||||
|
const uint8_t wcl = wc & 0xff;
|
||||||
|
const uint8_t wch = wc >> 8;
|
||||||
|
|
||||||
|
/* Data Identifier + Word Count (3 bytes):
|
||||||
|
* For computing Error Correction Code (ECC)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t di_wc[3] =
|
||||||
|
{
|
||||||
|
di,
|
||||||
|
wcl,
|
||||||
|
wch
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Compute ECC for Data Identifier + Word Count */
|
||||||
|
|
||||||
|
const uint8_t ecc = compute_ecc(di_wc, sizeof(di_wc));
|
||||||
|
|
||||||
|
/* Packet Header (4 bytes):
|
||||||
|
* Data Identifier + Word Count + Error Correction Code
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t header[4] =
|
||||||
|
{
|
||||||
|
di_wc[0],
|
||||||
|
di_wc[1],
|
||||||
|
di_wc[2],
|
||||||
|
ecc
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Checksum (CS) (2 bytes):
|
||||||
|
* 16-bit Cyclic Redundancy Check (CRC) of the Payload
|
||||||
|
* (Not the entire packet)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint16_t cs = compute_crc(txbuf, txlen);
|
||||||
|
const uint8_t csl = cs & 0xff;
|
||||||
|
const uint8_t csh = cs >> 8;
|
||||||
|
|
||||||
|
/* Packet Footer (2 bytes):
|
||||||
|
* Checksum (CS)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t footer[2] =
|
||||||
|
{
|
||||||
|
csl,
|
||||||
|
csh
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Packet Length:
|
||||||
|
* Packet Header (4 bytes)
|
||||||
|
* Payload (txlen bytes)
|
||||||
|
* Packet Footer (2 bytes)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const size_t len = sizeof(header) + txlen + sizeof(footer);
|
||||||
|
|
||||||
|
ginfo("channel=%d, cmd=0x%x, txlen=%ld\n", channel, cmd, txlen);
|
||||||
|
DEBUGASSERT(pktbuf != NULL && txbuf != NULL);
|
||||||
|
DEBUGASSERT(channel < 4);
|
||||||
|
DEBUGASSERT(cmd < (1 << 6));
|
||||||
|
|
||||||
|
if (txlen > 65541) /* Max 65,541 bytes for payload */
|
||||||
|
{
|
||||||
|
DEBUGPANIC();
|
||||||
|
return ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (len > pktlen) /* Packet Buffer too small */
|
||||||
|
{
|
||||||
|
DEBUGPANIC();
|
||||||
|
return ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Copy Packet Header, Payload, Packet Footer to Packet Buffer */
|
||||||
|
|
||||||
|
memcpy(pktbuf, header, sizeof(header));
|
||||||
|
memcpy(pktbuf + sizeof(header), txbuf, txlen);
|
||||||
|
memcpy(pktbuf + sizeof(header) + txlen, footer, sizeof(footer));
|
||||||
|
|
||||||
|
/* Return the Packet Length */
|
||||||
|
|
||||||
|
return len;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: mipi_dsi_short_packet
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Compose a MIPI DSI Short Packet. A Short Packet consists of Data
|
||||||
|
* Identifier (Virtual Channel + Data Type), Data (1 or 2 bytes) and
|
||||||
|
* Error Correction Code. Packet Length is 4 bytes.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* pktbuf - Buffer for the returned packet
|
||||||
|
* pktlen - Size of the packet buffer
|
||||||
|
* channel - Virtual Channel
|
||||||
|
* cmd - DCS Command (Data Type)
|
||||||
|
* txbuf - Payload data for the packet
|
||||||
|
* txlen - Length of payload data (1 or 2 bytes)
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Number of bytes in the returned packet; ERROR (-1) if packet buffer is
|
||||||
|
* too small for the packet
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
ssize_t mipi_dsi_short_packet(uint8_t *pktbuf,
|
||||||
|
size_t pktlen,
|
||||||
|
uint8_t channel,
|
||||||
|
enum mipi_dsi_e cmd,
|
||||||
|
const uint8_t *txbuf,
|
||||||
|
size_t txlen)
|
||||||
|
{
|
||||||
|
/* A Short Packet consists of 8-bit Data Identifier (DI),
|
||||||
|
* 2 bytes of commands or data, and 8-bit ECC.
|
||||||
|
* The length of a short packet is 4 bytes including ECC.
|
||||||
|
* Thus a MIPI DSI Short Packet (compared with Long Packet):
|
||||||
|
* - Doesn't have Packet Payload and Packet Footer (CRC)
|
||||||
|
* - Instead of Word Count (WC), the Packet Header now has 2 bytes of data
|
||||||
|
* Everything else is the same.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Data Identifier (DI) (1 byte):
|
||||||
|
* Virtual Channel Identifier (Bits 6 to 7)
|
||||||
|
* Data Type (Bits 0 to 5)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t vc = channel;
|
||||||
|
const uint8_t dt = cmd;
|
||||||
|
const uint8_t di = (vc << 6) | dt;
|
||||||
|
|
||||||
|
/* Data (2 bytes): Fill with 0 if Second Byte is missing */
|
||||||
|
|
||||||
|
const uint8_t data[2] =
|
||||||
|
{
|
||||||
|
txbuf[0], /* First Byte */
|
||||||
|
(txlen == 2) ? txbuf[1] : 0, /* Second Byte */
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Data Identifier + Data (3 bytes):
|
||||||
|
* For computing Error Correction Code (ECC)
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t di_data[3] =
|
||||||
|
{
|
||||||
|
di,
|
||||||
|
data[0],
|
||||||
|
data[1]
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Compute ECC for Data Identifier + Word Count */
|
||||||
|
|
||||||
|
const uint8_t ecc = compute_ecc(di_data, sizeof(di_data));
|
||||||
|
|
||||||
|
/* Packet Header (4 bytes):
|
||||||
|
* Data Identifier + Data + Error Correction Code
|
||||||
|
*/
|
||||||
|
|
||||||
|
const uint8_t header[4] =
|
||||||
|
{
|
||||||
|
di_data[0],
|
||||||
|
di_data[1],
|
||||||
|
di_data[2],
|
||||||
|
ecc
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Packet Length is Packet Header Size (4 bytes) */
|
||||||
|
|
||||||
|
const size_t len = sizeof(header);
|
||||||
|
|
||||||
|
ginfo("channel=%d, cmd=0x%x, txlen=%ld\n", channel, cmd, txlen);
|
||||||
|
DEBUGASSERT(pktbuf != NULL && txbuf != NULL);
|
||||||
|
DEBUGASSERT(channel < 4);
|
||||||
|
DEBUGASSERT(cmd < (1 << 6));
|
||||||
|
|
||||||
|
if (txlen < 1 || txlen > 2) /* Payload should be 1 or 2 bytes */
|
||||||
|
{
|
||||||
|
DEBUGPANIC();
|
||||||
|
return ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (len > pktlen) /* Packet Buffer too small */
|
||||||
|
{
|
||||||
|
DEBUGPANIC();
|
||||||
|
return ERROR;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Copy Packet Header to Packet Buffer */
|
||||||
|
|
||||||
|
memcpy(pktbuf, header, sizeof(header)); /* 4 bytes */
|
||||||
|
|
||||||
|
/* Return the Packet Length */
|
||||||
|
|
||||||
|
return len;
|
||||||
|
}
|
||||||
@@ -0,0 +1,108 @@
|
|||||||
|
/****************************************************************************
|
||||||
|
* arch/arm64/src/a64/mipi_dsi.h
|
||||||
|
*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
||||||
|
* contributor license agreements. See the NOTICE file distributed with
|
||||||
|
* this work for additional information regarding copyright ownership. The
|
||||||
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance with the
|
||||||
|
* License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||||
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||||
|
* License for the specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#ifndef __ARCH_ARM64_SRC_A64_MIPI_DSI_H
|
||||||
|
#define __ARCH_ARM64_SRC_A64_MIPI_DSI_H
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Pre-processor Definitions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/* MIPI DSI Processor-to-Peripheral Transaction Types */
|
||||||
|
|
||||||
|
enum mipi_dsi_e
|
||||||
|
{
|
||||||
|
/* DCS Short Write (Without Parameter) */
|
||||||
|
|
||||||
|
MIPI_DSI_DCS_SHORT_WRITE = 0x05,
|
||||||
|
|
||||||
|
/* DCS Short Write (With Parameter) */
|
||||||
|
|
||||||
|
MIPI_DSI_DCS_SHORT_WRITE_PARAM = 0x15,
|
||||||
|
|
||||||
|
/* DCS Long Write */
|
||||||
|
|
||||||
|
MIPI_DSI_DCS_LONG_WRITE = 0x39
|
||||||
|
};
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Function Prototypes
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: mipi_dsi_long_packet
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Compose a MIPI DSI Long Packet. A Short Packet consists of Data
|
||||||
|
* Identifier (Virtual Channel + Data Type), Word Count (Payload Size),
|
||||||
|
* Error Correction Code, Payload and Checksum. Packet Length is
|
||||||
|
* Payload Size + 6 bytes.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* pktbuf - Buffer for the returned packet
|
||||||
|
* pktlen - Size of the packet buffer
|
||||||
|
* channel - Virtual Channel
|
||||||
|
* cmd - DCS Command (Data Type)
|
||||||
|
* txbuf - Payload data for the packet
|
||||||
|
* txlen - Length of payload data (Max 65541 bytes)
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Number of bytes in the returned packet; ERROR (-1) if packet buffer is
|
||||||
|
* too small for the packet
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
ssize_t mipi_dsi_long_packet(uint8_t *pktbuf,
|
||||||
|
size_t pktlen,
|
||||||
|
uint8_t channel,
|
||||||
|
enum mipi_dsi_e cmd,
|
||||||
|
const uint8_t *txbuf,
|
||||||
|
size_t txlen);
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: mipi_dsi_short_packet
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Compose a MIPI DSI Short Packet. A Short Packet consists of Data
|
||||||
|
* Identifier (Virtual Channel + Data Type), Data (1 or 2 bytes) and
|
||||||
|
* Error Correction Code. Packet Length is 4 bytes.
|
||||||
|
*
|
||||||
|
* Input Parameters:
|
||||||
|
* pktbuf - Buffer for the returned packet
|
||||||
|
* pktlen - Size of the packet buffer
|
||||||
|
* channel - Virtual Channel
|
||||||
|
* cmd - DCS Command (Data Type)
|
||||||
|
* txbuf - Payload data for the packet
|
||||||
|
* txlen - Length of payload data (1 or 2 bytes)
|
||||||
|
*
|
||||||
|
* Returned Value:
|
||||||
|
* Number of bytes in the returned packet; ERROR (-1) if packet buffer is
|
||||||
|
* too small for the packet
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
ssize_t mipi_dsi_short_packet(uint8_t *pktbuf,
|
||||||
|
size_t pktlen,
|
||||||
|
uint8_t channel,
|
||||||
|
enum mipi_dsi_e cmd,
|
||||||
|
const uint8_t *txbuf,
|
||||||
|
size_t txlen);
|
||||||
|
|
||||||
|
#endif /* __ARCH_ARM64_SRC_A64_MIPI_DSI_H */
|
||||||
@@ -68,6 +68,29 @@ uint16_t crc16part(FAR const uint8_t *src, size_t len, uint16_t crc16val);
|
|||||||
|
|
||||||
uint16_t crc16(FAR const uint8_t *src, size_t len);
|
uint16_t crc16(FAR const uint8_t *src, size_t len);
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: crc16ccittpart
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Continue 16-bit CRC-CCITT calculation on a part of the buffer using the
|
||||||
|
* polynomial x^16+x^12+x^5+1.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
uint16_t crc16ccittpart(FAR const uint8_t *src, size_t len,
|
||||||
|
uint16_t crc16val);
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: crc16ccitt
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Return a 16-bit CRC-CCITT of the contents of the 'src' buffer, length
|
||||||
|
* 'len' using the polynomial x^16+x^12+x^5+1.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
uint16_t crc16ccitt(FAR const uint8_t *src, size_t len);
|
||||||
|
|
||||||
#undef EXTERN
|
#undef EXTERN
|
||||||
#ifdef __cplusplus
|
#ifdef __cplusplus
|
||||||
}
|
}
|
||||||
|
|||||||
@@ -36,8 +36,9 @@ endif
|
|||||||
# Add the miscellaneous C files to the build
|
# Add the miscellaneous C files to the build
|
||||||
|
|
||||||
CSRCS += lib_dumpbuffer.c lib_dumpvbuffer.c lib_fnmatch.c lib_debug.c
|
CSRCS += lib_dumpbuffer.c lib_dumpvbuffer.c lib_fnmatch.c lib_debug.c
|
||||||
CSRCS += lib_crc64.c lib_crc32.c lib_crc16.c lib_crc8.c lib_crc8ccitt.c
|
CSRCS += lib_crc64.c lib_crc32.c lib_crc16.c lib_crc16ccitt.c lib_crc8.c
|
||||||
CSRCS += lib_crc8table.c lib_glob.c lib_execinfo.c lib_ftok.c lib_err.c
|
CSRCS += lib_crc8ccitt.c lib_crc8table.c lib_glob.c lib_execinfo.c
|
||||||
|
CSRCS += lib_ftok.c lib_err.c
|
||||||
|
|
||||||
# Keyboard driver encoder/decoder
|
# Keyboard driver encoder/decoder
|
||||||
|
|
||||||
|
|||||||
@@ -0,0 +1,111 @@
|
|||||||
|
/****************************************************************************
|
||||||
|
* libs/libc/misc/lib_crc16ccitt.c
|
||||||
|
*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
||||||
|
* contributor license agreements. See the NOTICE file distributed with
|
||||||
|
* this work for additional information regarding copyright ownership. The
|
||||||
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance with the
|
||||||
|
* License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||||
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||||
|
* License for the specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Included Files
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
|
||||||
|
#include <nuttx/crc16.h>
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Private Data
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/* From CRC-16-CCITT (x^16+x^12+x^5+1) */
|
||||||
|
|
||||||
|
static uint16_t crc16ccitt_tab[256] =
|
||||||
|
{
|
||||||
|
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
|
||||||
|
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
|
||||||
|
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
|
||||||
|
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
|
||||||
|
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
|
||||||
|
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
|
||||||
|
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
|
||||||
|
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
|
||||||
|
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
|
||||||
|
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
|
||||||
|
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
|
||||||
|
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
|
||||||
|
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
|
||||||
|
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
|
||||||
|
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
|
||||||
|
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
|
||||||
|
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
|
||||||
|
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
|
||||||
|
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
|
||||||
|
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
|
||||||
|
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
|
||||||
|
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
|
||||||
|
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
|
||||||
|
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
|
||||||
|
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
|
||||||
|
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
|
||||||
|
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
|
||||||
|
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
|
||||||
|
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
|
||||||
|
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
|
||||||
|
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
|
||||||
|
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78,
|
||||||
|
};
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Public Functions
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: crc16ccittpart
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Continue 16-bit CRC-CCITT calculation on a part of the buffer using the
|
||||||
|
* polynomial x^16+x^12+x^5+1.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
uint16_t crc16ccittpart(FAR const uint8_t *src, size_t len,
|
||||||
|
uint16_t crc16val)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
uint16_t v = crc16val;
|
||||||
|
|
||||||
|
for (i = 0; i < len; i++)
|
||||||
|
{
|
||||||
|
v = (v >> 8) ^ crc16ccitt_tab[(v ^ src[i]) & 0xff];
|
||||||
|
}
|
||||||
|
|
||||||
|
return v;
|
||||||
|
}
|
||||||
|
|
||||||
|
/****************************************************************************
|
||||||
|
* Name: crc16ccitt
|
||||||
|
*
|
||||||
|
* Description:
|
||||||
|
* Return a 16-bit CRC-CCITT of the contents of the 'src' buffer, length
|
||||||
|
* 'len' using the polynomial x^16+x^12+x^5+1.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
|
||||||
|
uint16_t crc16ccitt(FAR const uint8_t *src, size_t len)
|
||||||
|
{
|
||||||
|
return crc16ccittpart(src, len, 0);
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user