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drivers/mpr121: Add support to MPR121 Capacitive Keypad
This driver adds support to MPR121 Capacitive Keypad usually found at Aliexpress. The MPR121 is a touch sensor chip from Freescale/NXP that supports up to 12 sensor electrodes and 1 proximity electrode. Signed-off-by: Alan C. Assis <acassis@gmail.com>
This commit is contained in:
Alan Carvalho de Assis
committed by
Alan C. Assis
Alan C. Assis
parent
1446961c87
commit
90ab0a8ae1
@@ -138,5 +138,9 @@ if(CONFIG_INPUT)
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list(APPEND SRCS goldfish_events.c)
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endif()
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if(CONFIG_INPUT_MPR121_KEYPAD)
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list(APPEND SRCS mpr121.c)
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endif()
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target_sources(drivers PRIVATE ${SRCS})
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endif()
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@@ -815,4 +815,20 @@ endif # INPUT_KMATRIX_I2C
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endif # INPUT_KMATRIX
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config INPUT_MPR121_KEYPAD
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bool "MPR121 Touch Keypad Driver"
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default n
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select INPUT_KEYBOARD
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---help---
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Enable support for keypad matrix powered by MPR121.
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if INPUT_MPR121_KEYPAD
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config INPUT_MPR121_KEYPAD_BUFSIZE
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int "Keyboard matrix buffer size"
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default 64
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---help---
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Size of the keyboard event buffer for each open file descriptor.
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endif # INPUT_MPR121_KEYPAD
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endif # INPUT
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@@ -138,6 +138,10 @@ ifeq ($(CONFIG_INPUT_GOLDFISH_EVENTS),y)
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CSRCS += goldfish_events.c
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endif
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ifeq ($(CONFIG_INPUT_MPR121_KEYPAD),y)
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CSRCS += mpr121.c
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endif
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# Include input device driver build support
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DEPPATH += --dep-path input
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File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,213 @@
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/****************************************************************************
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* drivers/input/mpr121.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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 __DRIVERS_INPUT_MPR121_H
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#define __DRIVERS_INPUT_MPR121_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* MPR121 Address */
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#define MPR121_ELE0_7_TS (0x00) /* Bits 0-7: E(n) Touch Status */
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#define MPR121_ELE8_11_TS (0x01) /* Bits 0-7: E(n)TS, OVCF */
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#define MPR121_ELE0_7_OOR (0x02) /* Bits 0-7: E(n)OOR status */
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#define MPR121_ELE8_11_OOR (0x03) /* Bits 0-7: E(n)OOR, ACFF, ARFF */
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#define MPR121_ELE0_FDL (0x04) /* Bits 0-7: ELE0 Filtered Data LSB */
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#define MPR121_ELE0_FDM (0x05) /* Bits 0-1: ELE0 Filtered Data MSB */
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#define MPR121_ELE1_FDL (0x06) /* Bits 0-7: ELE1 Filtered Data LSB */
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#define MPR121_ELE1_FDM (0x07) /* Bits 0-1: ELE1 Filtered Data MSB */
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#define MPR121_ELE2_FDL (0x08) /* Bits 0-7: ELE2 Filtered Data LSB */
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#define MPR121_ELE2_FDM (0x09) /* Bits 0-1: ELE2 Filtered Data MSB */
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#define MPR121_ELE3_FDL (0x0a) /* Bits 0-7: ELE3 Filtered Data LSB */
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#define MPR121_ELE3_FDM (0x0b) /* Bits 0-1: ELE3 Filtered Data MSB */
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#define MPR121_ELE4_FDL (0x0c) /* Bits 0-7: ELE4 Filtered Data LSB */
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#define MPR121_ELE4_FDM (0x0d) /* Bits 0-1: ELE4 Filtered Data MSB */
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#define MPR121_ELE5_FDL (0x0e) /* Bits 0-7: ELE5 Filtered Data LSB */
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#define MPR121_ELE5_FDM (0x0f) /* Bits 0-1: ELE5 Filtered Data MSB */
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#define MPR121_ELE6_FDL (0x10) /* Bits 0-7: ELE6 Filtered Data LSB */
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#define MPR121_ELE6_FDM (0x11) /* Bits 0-1: ELE6 Filtered Data MSB */
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#define MPR121_ELE7_FDL (0x12) /* Bits 0-7: ELE7 Filtered Data LSB */
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#define MPR121_ELE7_FDM (0x13) /* Bits 0-1: ELE7 Filtered Data MSB */
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#define MPR121_ELE8_FDL (0x14) /* Bits 0-7: ELE8 Filtered Data LSB */
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#define MPR121_ELE8_FDM (0x15) /* Bits 0-1: ELE8 Filtered Data MSB */
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#define MPR121_ELE9_FDL (0x16) /* Bits 0-7: ELE9 Filtered Data LSB */
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#define MPR121_ELE9_FDM (0x17) /* Bits 0-1: ELE9 Filtered Data MSB */
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#define MPR121_ELE10_FDL (0x18) /* Bits 0-7: ELE10 Filtered Data LSB */
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#define MPR121_ELE10_FDM (0x19) /* Bits 0-1: ELE10 Filtered Data MSB */
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#define MPR121_ELE11_FDL (0x1a) /* Bits 0-7: ELE11 Filtered Data LSB */
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#define MPR121_ELE11_FDM (0x1b) /* Bits 0-1: ELE11 Filtered Data MSB */
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#define MPR121_ELE12_FDL (0x1c) /* Bits 0-7: ELEPROX Filtered Data LSB */
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#define MPR121_ELE12_FDM (0x1d) /* Bits 0-1: ELEPROX Filtered Data MSB */
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#define MPR121_ELE0_BV (0x1e) /* Bits 0-7: ELE0 Baseline Value */
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#define MPR121_ELE1_BV (0x1f) /* Bits 0-7: ELE1 Baseline Value */
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#define MPR121_ELE2_BV (0x20) /* Bits 0-7: ELE2 Baseline Value */
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#define MPR121_ELE3_BV (0x21) /* Bits 0-7: ELE3 Baseline Value */
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#define MPR121_ELE4_BV (0x22) /* Bits 0-7: ELE4 Baseline Value */
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#define MPR121_ELE5_BV (0x23) /* Bits 0-7: ELE5 Baseline Value */
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#define MPR121_ELE6_BV (0x24) /* Bits 0-7: ELE6 Baseline Value */
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#define MPR121_ELE7_BV (0x25) /* Bits 0-7: ELE7 Baseline Value */
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#define MPR121_ELE8_BV (0x26) /* Bits 0-7: ELE8 Baseline Value */
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#define MPR121_ELE9_BV (0x27) /* Bits 0-7: ELE9 Baseline Value */
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#define MPR121_ELE10_BV (0x28) /* Bits 0-7: ELE10 Baseline Value */
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#define MPR121_ELE11_BV (0x29) /* Bits 0-7: ELE11 Baseline Value */
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#define MPR121_ELE12_BV (0x2a) /* Bits 0-7: ELEPROX Baseline Value */
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#define MPR121_MHDR (0x2b) /* Bits 0-5: MHD Rising */
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#define MPR121_NHDR (0x2c) /* Bits 0-5: NHD Rising */
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#define MPR121_NCLR (0x2d) /* Bits 0-7: NCL Rising */
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#define MPR121_FDLR (0x2e) /* Bits 0-7: FDL Rising */
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#define MPR121_MHDF (0x2f) /* Bits 0-5: MHD Falling */
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#define MPR121_NHDF (0x30) /* Bits 0-5: NHD Falling */
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#define MPR121_NCLF (0x31) /* Bits 0-7: NCL Falling */
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#define MPR121_FDLF (0x32) /* Bits 0-7: FDL Falling */
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#define MPR121_NHDT (0x33) /* Bits 0-5: NHD Touched */
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#define MPR121_NCLT (0x34) /* Bits 0-7: NCL Touched */
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#define MPR121_FDLT (0x35) /* Bits 0-7: FDL Touched */
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#define MPR121_MHDPROXR (0x36) /* Bits 0-5: ELEPROX MHD Rising */
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#define MPR121_NHDPROXR (0x37) /* Bits 0-5: ELEPROX NHD Rising */
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#define MPR121_NCLPROXR (0x38) /* Bits 0-7: ELEPROX NCL Rising */
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#define MPR121_FDLPROXR (0x39) /* Bits 0-7: ELEPROX FDL Rising */
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#define MPR121_MHDPROXF (0x3a) /* Bits 0-5: ELEPROX MHD Falling */
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#define MPR121_NHDPROXF (0x3b) /* Bits 0-5: ELEPROX NHD Falling */
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#define MPR121_NCLPROXF (0x3c) /* Bits 0-7: ELEPROX NCL Falling */
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#define MPR121_FDLPROXF (0x3d) /* Bits 0-7: ELEPROX FDL Falling */
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#define MPR121_NHDPROXT (0x3e) /* Bits 0-5: ELEPROX NHD Touched */
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#define MPR121_NCLPROXT (0x3f) /* Bits 0-7: ELEPROX NCL Touched */
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#define MPR121_FDLPROXT (0x40) /* Bits 0-7: ELEPROX FDL Touched */
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#define MPR121_E0TTH (0x41) /* Bits 0-7: ELE0 Touch Threshold */
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#define MPR121_E0RTH (0x42) /* Bits 0-7: ELE0 Release Threshold */
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#define MPR121_E1TTH (0x43) /* Bits 0-7: ELE1 Touch Threshold */
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#define MPR121_E1RTH (0x44) /* Bits 0-7: ELE1 Release Threshold */
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#define MPR121_E2TTH (0x45) /* Bits 0-7: ELE2 Touch Threshold */
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#define MPR121_E2RTH (0x46) /* Bits 0-7: ELE2 Release Threshold */
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#define MPR121_E3TTH (0x47) /* Bits 0-7: ELE3 Touch Threshold */
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#define MPR121_E3RTH (0x48) /* Bits 0-7: ELE3 Release Threshold */
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#define MPR121_E4TTH (0x49) /* Bits 0-7: ELE4 Touch Threshold */
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#define MPR121_E4RTH (0x4a) /* Bits 0-7: ELE4 Release Threshold */
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#define MPR121_E5TTH (0x4b) /* Bits 0-7: ELE5 Touch Threshold */
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#define MPR121_E5RTH (0x4c) /* Bits 0-7: ELE5 Release Threshold */
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#define MPR121_E6TTH (0x4d) /* Bits 0-7: ELE6 Touch Threshold */
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#define MPR121_E6RTH (0x4e) /* Bits 0-7: ELE6 Release Threshold */
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#define MPR121_E7TTH (0x4f) /* Bits 0-7: ELE7 Touch Threshold */
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#define MPR121_E7RTH (0x50) /* Bits 0-7: ELE7 Release Threshold */
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#define MPR121_E8TTH (0x51) /* Bits 0-7: ELE8 Touch Threshold */
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#define MPR121_E8RTH (0x52) /* Bits 0-7: ELE8 Release Threshold */
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#define MPR121_E9TTH (0x53) /* Bits 0-7: ELE9 Touch Threshold */
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#define MPR121_E9RTH (0x54) /* Bits 0-7: ELE9 Release Threshold */
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#define MPR121_E10TTH (0x55) /* Bits 0-7: ELE10 Touch Threshold */
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#define MPR121_E10RTH (0x56) /* Bits 0-7: ELE10 Release Threshold */
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#define MPR121_E11TTH (0x57) /* Bits 0-7: ELE11 Touch Threshold */
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#define MPR121_E11RTH (0x58) /* Bits 0-7: ELE11 Release Threshold */
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#define MPR121_E12TTH (0x59) /* Bits 0-7: ELE12 Touch Threshold */
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#define MPR121_E12RTH (0x5a) /* Bits 0-7: ELE12 Release Threshold */
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#define MPR121_DT_DR (0x5b) /* Bits 0-2,4-6: Debounce Touch & Release */
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#define MPR121_AFE1 (0x5c) /* Bits 0-5,6-7: CDC and FFI */
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#define MPR121_AFE2 (0x5d) /* Bits 0-2,3-4,5-7: ESI, SFI, CDT */
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#define MPR121_ECR (0x5e) /* Bits 0-4,4-5,6-7: ELE, ELEPROX, CL */
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#define MPR121_CDC0 (0x5f) /* Bits 0-5: ELE0 Electrode Current */
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#define MPR121_CDC1 (0x60) /* Bits 0-5: ELE1 Electrode Current */
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#define MPR121_CDC2 (0x61) /* Bits 0-5: ELE2 Electrode Current */
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#define MPR121_CDC3 (0x62) /* Bits 0-5: ELE3 Electrode Current */
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#define MPR121_CDC4 (0x63) /* Bits 0-5: ELE4 Electrode Current */
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#define MPR121_CDC5 (0x64) /* Bits 0-5: ELE5 Electrode Current */
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#define MPR121_CDC6 (0x65) /* Bits 0-5: ELE6 Electrode Current */
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#define MPR121_CDC7 (0x66) /* Bits 0-5: ELE7 Electrode Current */
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#define MPR121_CDC8 (0x67) /* Bits 0-5: ELE8 Electrode Current */
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#define MPR121_CDC9 (0x68) /* Bits 0-5: ELE9 Electrode Current */
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#define MPR121_CDC10 (0x69) /* Bits 0-5: ELE10 Electrode Current */
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#define MPR121_CDC11 (0x6a) /* Bits 0-5: ELE11 Electrode Current */
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#define MPR121_CDC12 (0x6b) /* Bits 0-5: ELE12 Electrode Current */
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#define MPR121_CDT0_CDT1 (0x6c) /* Bits 0-2,4-6: E0 & E1 Charge time */
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#define MPR121_CDT2_CDT3 (0x6d) /* Bits 0-2,4-6: E2 & E3 Charge time */
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#define MPR121_CDT4_CDT5 (0x6e) /* Bits 0-2,4-6: E4 & E5 Charge time */
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#define MPR121_CDT6_CDT7 (0x6f) /* Bits 0-2,4-6: E6 & E7 Charge time */
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#define MPR121_CDT8_CDT9 (0x70) /* Bits 0-2,4-6: E8 & E9 Charge time */
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#define MPR121_CDT10_CDT11 (0x71) /* Bits 0-2,4-6: E10 & E11 Charge time */
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#define MPR121_CDT12 (0x72) /* Bits 0-2: E12 Charge time */
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#define MPR121_CTL0 (0x73) /* Bits 0-7: GPIO Control Register 0 */
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#define MPR121_CTL1 (0x74) /* Bits 0-7: GPIO Control Register 0 */
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#define MPR121_DAT (0x75) /* Bits 0-7: GPIO Data Register */
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#define MPR121_DIR (0x76) /* Bits 0-7: GPIO Direction Control Register */
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#define MPR121_EN (0x77) /* Bits 0-7: GPIO Enable Register */
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#define MPR121_SET (0x78) /* Bits 0-7: GPIO Data Set Register */
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#define MPR121_CLR (0x79) /* Bits 0-7: GPIO Data Clear Register */
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#define MPR121_TOG (0x7a) /* Bits 0-7: GPIO Data Toggle Register */
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#define MPR121_AUTOCONF0 (0x7b) /* Bits 0,1,2-3,4-5,6-7: ACE, ARE, BVA, RETRY, AFES */
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#define MPR121_AUTOCONF1 (0x7c) /* Bits 0,1,3,7: ACFIE, ARFIE, OORIE, SCTS */
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#define MPR121_UPLIMIT (0x7d) /* Bits 0-7: Auto Config USL Register */
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#define MPR121_LOWLIMIT (0x7e) /* Bits 0-7: Auto Config LSL Register */
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#define MPR121_TARGETLIMIT (0x7f) /* Bits 0-7: Auto Config Target Level Register */
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#define MPR121_SRST (0x80) /* Bits 0-7: Soft Reset Register */
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/* Factory Reserved Region (0x81~0xff) */
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/* Tuning defaults for a standard 3.3 V keypad */
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#define MPR121_TOUCH_THRESHOLD 12 /* Lower means more sensitive */
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#define MPR121_RELEASE_THRESHOLD 6 /* Must be < touch threshold */
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/* Touch / Release thresholds (0x41..0x64, 2 bytes each) */
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#define MPR121_REG_TOUCH_THRESH(n) (0x41 + (n) * 2)
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#define MPR121_REG_REL_THRESH(n) (0x42 + (n) * 2)
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/* AFE1: FFI=6 samples (00), CDC=16uA charge (10000) => 0x10 */
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#define MPR121_AFE1_VALUE 0x10
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/* AFE2: CDT=0.5 us (001), SFI=4 samples (00), ESI=1 ms (001) => 0x24 */
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#define MPR121_AFE2_VALUE 0x24
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/* Auto-config: limit registers (Vdd = 3.3 V, target ~70 % of Vdd) */
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#define MPR121_UPLIMIT_VALUE 200 /* (Vdd - 0.7) / Vdd * 256 */
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#define MPR121_LOWLIMIT_VALUE 130 /* UPLIMIT * 0.65 */
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#define MPR121_TARGETLIMIT_VALUE 180 /* UPLIMIT * 0.9 */
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/* ECR: CL=10 (use 5 MSB of baseline), ELEPROX_EN=0, ELE_EN=1100 (ELE0-11) */
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#define MPR121_ECR_VALUE 0xCC /* Run mode, all 12 electrodes */
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __DRIVERS_INPUT_MPR121_H */
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@@ -0,0 +1,96 @@
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/****************************************************************************
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* include/nuttx/input/mpr121.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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 __INCLUDE_NUTTX_INPUT_MPR121_H
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#define __INCLUDE_NUTTX_INPUT_MPR121_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 <nuttx/input/keyboard.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Number of keys used by MPR121 */
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#define MPR121_NUMKEY 12
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/****************************************************************************
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* Public Types
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****************************************************************************/
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typedef uint32_t mpr121_pin_t;
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/* Keypad matrix configuration structure passed to mpr121_register() */
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struct mpr121_config_s
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{
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CODE int (*irq_attach)(FAR const struct mpr121_config_s *state,
|
||||
xcpt_t isr, FAR void *arg);
|
||||
FAR struct i2c_master_s *i2c_dev;
|
||||
uint8_t i2c_addr;
|
||||
|
||||
/* Keymap: keycode[MPR121_NUMKEY] to map the keys of MPR121 keypad */
|
||||
|
||||
FAR const uint32_t *keymap;
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C"
|
||||
{
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: mpr121_register
|
||||
*
|
||||
* Description:
|
||||
* Configure and register a keypad matrix device. This will create the
|
||||
* /dev/keypadN device node and enable keyboard scanning.
|
||||
*
|
||||
* Input Parameters:
|
||||
* config - The keyboard matrix configuration. This structure is not
|
||||
* copied; it must persist for the lifetime of the driver.
|
||||
* devpath - The device path for the /dev/keypadN device.
|
||||
*
|
||||
* Returned Value:
|
||||
* Zero is returned on success. Otherwise, a negated errno value is
|
||||
* returned to indicate the nature of the failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int mpr121_register(FAR const struct mpr121_config_s *config,
|
||||
FAR const char *devpath);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* __INCLUDE_NUTTX_INPUT_MPR121_H */
|
||||
Reference in New Issue
Block a user