mirror of
https://github.com/apache/nuttx.git
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arch/arm/src/samd2l2: Add RS485 support to SAMD2L2 serial
This commit is contained in:
Alan Carvalho de Assis
committed by
Gregory Nutt
Gregory Nutt
parent
bb2391358c
commit
a34c9733bc
@@ -616,6 +616,27 @@ config SAMD2L2_SERCOM0_ISUSART
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endchoice
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if USART0_SERIALDRIVER
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config USART0_RS485MODE
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bool "RS-485 on USART0"
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default n
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---help---
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Enable RS-485 interface on USART0. Your board config will have to
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provide GPIO_USART0_RS485_DIR pin definition. Currently it cannot be
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used with USART0_RXDMA.
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config USART0_RS485_DIR_POLARITY
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int "USART0 RS-485 DIR pin polarity"
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default 1
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range 0 1
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depends on USART0_RS485MODE
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---help---
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Polarity of DIR pin for RS-485 on USART0. Set to state on DIR pin which
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enables TX (0 - low / nTXEN, 1 - high / TXEN).
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endif # USART0_SERIALDRIVER
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choice
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prompt "SERCOM1 mode"
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default SAMD2L2_SERCOM1_ISUSART
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@@ -636,6 +657,27 @@ config SAMD2L2_SERCOM1_ISUSART
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endchoice
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if USART1_SERIALDRIVER
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config USART1_RS485MODE
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bool "RS-485 on USART1"
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default n
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---help---
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Enable RS-485 interface on USART1. Your board config will have to
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provide GPIO_USART1_RS485_DIR pin definition. Currently it cannot be
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used with USART1_RXDMA.
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config USART1_RS485_DIR_POLARITY
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int "USART1 RS-485 DIR pin polarity"
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default 1
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range 0 1
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depends on USART1_RS485MODE
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---help---
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Polarity of DIR pin for RS-485 on USART1. Set to state on DIR pin which
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enables TX (0 - low / nTXEN, 1 - high / TXEN).
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endif # USART1_SERIALDRIVER
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choice
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prompt "SERCOM2 mode"
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default SAMD2L2_SERCOM2_ISUSART
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@@ -656,6 +698,27 @@ config SAMD2L2_SERCOM2_ISUSART
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endchoice
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if USART2_SERIALDRIVER
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config USART2_RS485MODE
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bool "RS-485 on USART2"
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default n
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---help---
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Enable RS-485 interface on USART2. Your board config will have to
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provide GPIO_USART2_RS485_DIR pin definition. Currently it cannot be
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used with USART2_RXDMA.
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config USART2_RS485_DIR_POLARITY
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int "USART2 RS-485 DIR pin polarity"
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default 1
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range 0 1
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depends on USART2_RS485MODE
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---help---
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Polarity of DIR pin for RS-485 on USART2. Set to state on DIR pin which
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enables TX (0 - low / nTXEN, 1 - high / TXEN).
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endif # USART2_SERIALDRIVER
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choice
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prompt "SERCOM3 mode"
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default SAMD2L2_SERCOM3_ISUSART
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@@ -676,6 +739,27 @@ config SAMD2L2_SERCOM3_ISUSART
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endchoice
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if USART3_SERIALDRIVER
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config USART3_RS485MODE
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bool "RS-485 on USART3"
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default n
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---help---
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Enable RS-485 interface on USART3. Your board config will have to
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provide GPIO_USART3_RS485_DIR pin definition. Currently it cannot be
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used with USART3_RXDMA.
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config USART3_RS485_DIR_POLARITY
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int "USART3 RS-485 DIR pin polarity"
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default 1
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range 0 1
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depends on USART3_RS485MODE
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---help---
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Polarity of DIR pin for RS-485 on USART3. Set to state on DIR pin which
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enables TX (0 - low / nTXEN, 1 - high / TXEN).
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endif # USART3_SERIALDRIVER
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choice
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prompt "SERCOM4 mode"
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default SAMD2L2_SERCOM4_ISUSART
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@@ -696,6 +780,27 @@ config SAMD2L2_SERCOM4_ISUSART
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endchoice
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if USART4_SERIALDRIVER
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config USART4_RS485MODE
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bool "RS-485 on USART4"
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default n
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---help---
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Enable RS-485 interface on USART4. Your board config will have to
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provide GPIO_USART4_RS485_DIR pin definition. Currently it cannot be
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used with USART4_RXDMA.
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config USART4_RS485_DIR_POLARITY
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int "USART4 RS-485 DIR pin polarity"
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default 1
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range 0 1
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depends on USART4_RS485MODE
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---help---
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Polarity of DIR pin for RS-485 on USART4. Set to state on DIR pin which
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enables TX (0 - low / nTXEN, 1 - high / TXEN).
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endif # USART4_SERIALDRIVER
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choice
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prompt "SERCOM5 mode"
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default SAMD2L2_SERCOM5_ISUSART
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@@ -716,6 +821,27 @@ config SAMD2L2_SERCOM5_ISUSART
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endchoice
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if USART5_SERIALDRIVER
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config USART5_RS485MODE
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bool "RS-485 on USART5"
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default n
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---help---
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Enable RS-485 interface on USART5. Your board config will have to
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provide GPIO_USART5_RS485_DIR pin definition. Currently it cannot be
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used with USART5_RXDMA.
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config USART5_RS485_DIR_POLARITY
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int "USART5 RS-485 DIR pin polarity"
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default 1
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range 0 1
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depends on USART5_RS485MODE
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---help---
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Polarity of DIR pin for RS-485 on USART5. Set to state on DIR pin which
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enables TX (0 - low / nTXEN, 1 - high / TXEN).
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endif # USART5_SERIALDRIVER
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config SAMD2L2_HAVE_SPI
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bool
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select SPI
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@@ -1,7 +1,7 @@
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/************************************************************************************
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* arch/arm/src/samd2l2/sam_config.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Copyright (C) 2014, 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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@@ -135,6 +135,14 @@
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# undef CONFIG_USART4_SERIAL_CONSOLE
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# undef CONFIG_USART5_SERIAL_CONSOLE
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# define HAVE_SERIAL_CONSOLE 1
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# ifdef CONFIG_USART0_RS485MODE
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# define SAM_CONSOLE_RS485_DIR GPIO_USART0_RS485_DIR
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# if (CONFIG_USART0_RS485_DIR_POLARITY == 0)
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# define SAM_CONSOLE_RS485_DIR_POLARITY false
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# else
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# define SAM_CONSOLE_RS485_DIR_POLARITY true
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# endif
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# endif
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#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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@@ -142,6 +150,14 @@
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# undef CONFIG_USART4_SERIAL_CONSOLE
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# undef CONFIG_USART5_SERIAL_CONSOLE
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# define HAVE_SERIAL_CONSOLE 1
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# ifdef CONFIG_USART1_RS485MODE
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# define SAM_CONSOLE_RS485_DIR GPIO_USART1_RS485_DIR
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# if (CONFIG_USART1_RS485_DIR_POLARITY == 0)
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# define SAM_CONSOLE_RS485_DIR_POLARITY false
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# else
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# define SAM_CONSOLE_RS485_DIR_POLARITY true
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# endif
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# endif
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#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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@@ -149,6 +165,14 @@
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# undef CONFIG_USART4_SERIAL_CONSOLE
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# undef CONFIG_USART5_SERIAL_CONSOLE
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# define HAVE_SERIAL_CONSOLE 1
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# ifdef CONFIG_USART2_RS485MODE
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# define SAM_CONSOLE_RS485_DIR GPIO_USART2_RS485_DIR
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# if (CONFIG_USART2_RS485_DIR_POLARITY == 0)
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# define SAM_CONSOLE_RS485_DIR_POLARITY false
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# else
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# define SAM_CONSOLE_RS485_DIR_POLARITY true
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# endif
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# endif
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#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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@@ -156,6 +180,14 @@
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# undef CONFIG_USART4_SERIAL_CONSOLE
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# undef CONFIG_USART5_SERIAL_CONSOLE
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# define HAVE_SERIAL_CONSOLE 1
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# ifdef CONFIG_USART3_RS485MODE
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# define SAM_CONSOLE_RS485_DIR GPIO_USART3_RS485_DIR
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# if (CONFIG_USART3_RS485_DIR_POLARITY == 0)
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# define SAM_CONSOLE_RS485_DIR_POLARITY false
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# else
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# define SAM_CONSOLE_RS485_DIR_POLARITY true
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# endif
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# endif
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#elif defined(CONFIG_USART4_SERIAL_CONSOLE)
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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@@ -163,6 +195,14 @@
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# undef CONFIG_USART5_SERIAL_CONSOLE
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# define HAVE_SERIAL_CONSOLE 1
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# ifdef CONFIG_USART4_RS485MODE
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# define SAM_CONSOLE_RS485_DIR GPIO_USART4_RS485_DIR
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# if (CONFIG_USART4_RS485_DIR_POLARITY == 0)
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# define SAM_CONSOLE_RS485_DIR_POLARITY false
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# else
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# define SAM_CONSOLE_RS485_DIR_POLARITY true
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# endif
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# endif
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#elif defined(CONFIG_USART5_SERIAL_CONSOLE)
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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@@ -170,6 +210,14 @@
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# undef CONFIG_USART4_SERIAL_CONSOLE
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# define HAVE_SERIAL_CONSOLE 1
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# ifdef CONFIG_USART5_RS485MODE
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# define SAM_CONSOLE_RS485_DIR GPIO_USART5_RS485_DIR
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# if (CONFIG_USART5_RS485_DIR_POLARITY == 0)
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# define SAM_CONSOLE_RS485_DIR_POLARITY false
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# else
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# define SAM_CONSOLE_RS485_DIR_POLARITY true
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# endif
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# endif
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#else
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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@@ -178,6 +226,7 @@
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# undef CONFIG_USART4_SERIAL_CONSOLE
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# undef CONFIG_USART5_SERIAL_CONSOLE
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# undef HAVE_SERIAL_CONSOLE
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# undef SAM_CONSOLE_RS485_DIR
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#endif
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/* Are any SERCOM peripherals are configured as SPI peripherals? */
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@@ -1,7 +1,7 @@
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/****************************************************************************
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* arch/arm/src/samd2l2/sam_lowputc.c
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*
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* Copyright (C) 2014-2016 Gregory Nutt. All rights reserved.
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* Copyright (C) 2014-2016, 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* References:
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@@ -467,7 +467,13 @@ void sam_lowputc(uint32_t ch)
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/* Wait for the USART to be ready for new TX data */
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while ((getreg8(intflag) & USART_INT_DRE) == 0);
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while ((getreg8(intflag) & USART_INT_DRE) == 0)
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{
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}
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#ifdef SAM_CONSOLE_RS485_DIR
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sam_portwrite(SAM_CONSOLE_RS485_DIR, SAM_CONSOLE_RS485_DIR_POLARITY);
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#endif
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/* Wait until synchronization is complete */
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@@ -479,6 +485,12 @@ void sam_lowputc(uint32_t ch)
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/* Wait until data is sent */
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while ((getreg8(intflag) & USART_INT_TXC) == 0);
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while ((getreg8(intflag) & USART_INT_TXC) == 0)
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{
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}
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#ifdef SAM_CONSOLE_RS485_DIR
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sam_portwrite(SAM_CONSOLE_RS485_DIR, !SAM_CONSOLE_RS485_DIR_POLARITY);
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#endif
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}
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#endif
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@@ -1,7 +1,7 @@
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/****************************************************************************
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* arch/arm/src/samd2l2/sam_serial.c
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*
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* Copyright (C) 2014-2015 Gregory Nutt. All rights reserved.
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* Copyright (C) 2014-2015, 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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@@ -229,6 +229,11 @@ struct sam_dev_s
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const struct sam_usart_config_s * const config;
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/* Information unique to the serial driver */
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#ifdef HAVE_RS485
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const uint32_t rs485_dir_gpio; /* USART RS-485 DIR GPIO pin configuration */
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const bool rs485_dir_polarity; /* USART RS-485 DIR pin state for TX enabled */
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#endif
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};
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/****************************************************************************
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@@ -320,6 +325,14 @@ static char g_usart5txbuffer[CONFIG_USART5_TXBUFSIZE];
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static struct sam_dev_s g_usart0priv =
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{
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.config = &g_usart0config,
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#ifdef CONFIG_USART0_RS485MODE
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.rs485_dir_gpio = GPIO_USART0_RS485_DIR,
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# if (CONFIG_USART0_RS485_DIR_POLARITY == 0)
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.rs485_dir_polarity = false,
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# else
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.rs485_dir_polarity = true,
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# endif
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#endif
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};
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static uart_dev_t g_usart0port =
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@@ -345,6 +358,14 @@ static uart_dev_t g_usart0port =
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static struct sam_dev_s g_usart1priv =
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{
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.config = &g_usart1config,
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#ifdef CONFIG_USART1_RS485MODE
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.rs485_dir_gpio = GPIO_USART1_RS485_DIR,
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# if (CONFIG_USART1_RS485_DIR_POLARITY == 0)
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.rs485_dir_polarity = false,
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# else
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.rs485_dir_polarity = true,
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# endif
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#endif
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};
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static uart_dev_t g_usart1port =
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@@ -370,6 +391,14 @@ static uart_dev_t g_usart1port =
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static struct sam_dev_s g_usart2priv =
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{
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.config = &g_usart2config,
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#ifdef CONFIG_USART2_RS485MODE
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.rs485_dir_gpio = GPIO_USART2_RS485_DIR,
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# if (CONFIG_USART2_RS485_DIR_POLARITY == 0)
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.rs485_dir_polarity = false,
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# else
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.rs485_dir_polarity = true,
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# endif
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#endif
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};
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static uart_dev_t g_usart2port =
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@@ -395,6 +424,14 @@ static uart_dev_t g_usart2port =
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static struct sam_dev_s g_usart3priv =
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{
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.config = &g_usart3config,
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#ifdef CONFIG_USART3_RS485MODE
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.rs485_dir_gpio = GPIO_USART3_RS485_DIR,
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# if (CONFIG_USART3_RS485_DIR_POLARITY == 0)
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.rs485_dir_polarity = false,
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# else
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.rs485_dir_polarity = true,
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# endif
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#endif
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};
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static uart_dev_t g_usart3port =
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@@ -420,6 +457,14 @@ static uart_dev_t g_usart3port =
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static struct sam_dev_s g_usart4priv =
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{
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.config = &g_usart4config,
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#ifdef CONFIG_USART4_RS485MODE
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.rs485_dir_gpio = GPIO_USART4_RS485_DIR,
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# if (CONFIG_USART4_RS485_DIR_POLARITY == 0)
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.rs485_dir_polarity = false,
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# else
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.rs485_dir_polarity = true,
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# endif
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#endif
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};
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static uart_dev_t g_usart4port =
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@@ -445,6 +490,14 @@ static uart_dev_t g_usart4port =
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static struct sam_dev_s g_usart5priv =
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{
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.config = &g_usart5config,
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#ifdef CONFIG_USART5_RS485MODE
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.rs485_dir_gpio = GPIO_USART5_RS485_DIR,
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# if (CONFIG_USART5_RS485_DIR_POLARITY == 0)
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.rs485_dir_polarity = false,
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# else
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.rs485_dir_polarity = true,
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# endif
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#endif
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};
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static uart_dev_t g_usart5port =
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@@ -548,6 +601,20 @@ static int sam_interrupt(int irq, void *context, FAR void *arg)
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inten = sam_serialin8(priv, SAM_USART_INTENCLR_OFFSET);
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pending = intflag & inten;
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#ifdef HAVE_RS485
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/* Transmission of whole buffer is over - TXC is set.
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* Note - this should be first, to have the most recent TC bit value from
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* SR register - sending data affects TXC, but without refresh we will not
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* know that...
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*/
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if ((pending & USART_INT_TXC) != 0)
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{
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sam_portwrite(priv->rs485_dir_gpio, !priv->rs485_dir_polarity);
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sam_serialout8(priv, SAM_USART_INTENCLR_OFFSET, USART_INT_TXC);
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}
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||||
#endif
|
||||
|
||||
/* Handle an incoming, receive byte. The RXC flag is set when there is
|
||||
* unread data in DATA register. This flag is cleared by reading the DATA
|
||||
* register (or by disabling the receiver).
|
||||
@@ -602,6 +669,14 @@ static int sam_setup(struct uart_dev_s *dev)
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_RS485
|
||||
if (priv->rs485_dir_gpio != 0)
|
||||
{
|
||||
(void)sam_configport(priv->rs485_dir_gpio);
|
||||
sam_portwrite(priv->rs485_dir_gpio, !priv->rs485_dir_polarity);
|
||||
}
|
||||
#endif
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
@@ -831,7 +906,7 @@ static void sam_txint(struct uart_dev_s *dev, bool enable)
|
||||
*/
|
||||
|
||||
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
|
||||
sam_serialout8(priv, SAM_USART_INTENSET_OFFSET, USART_INT_DRE);
|
||||
sam_serialout8(priv, SAM_USART_INTENSET_OFFSET, USART_TX_INTS);
|
||||
|
||||
/* Fake a TX interrupt here by just calling uart_xmitchars() with
|
||||
* interrupts disabled (note this may recurse).
|
||||
@@ -843,7 +918,7 @@ static void sam_txint(struct uart_dev_s *dev, bool enable)
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Disable the TX interrupt */
|
||||
/* Disable the TX interrupt. Only disable DRE, TXC will disable itself! */
|
||||
|
||||
sam_serialout8(priv, SAM_USART_INTENCLR_OFFSET, USART_INT_DRE);
|
||||
}
|
||||
|
||||
@@ -79,6 +79,20 @@
|
||||
# undef g_consoleconfig
|
||||
#endif
|
||||
|
||||
/* Is RS-485 used? */
|
||||
|
||||
#if defined(CONFIG_USART0_RS485MODE) || defined(CONFIG_USART1_RS485MODE) || \
|
||||
defined(CONFIG_USART2_RS485MODE) || defined(CONFIG_USART3_RS485MODE) || \
|
||||
defined(CONFIG_USART4_RS485MODE) || defined(CONFIG_USART5_RS485MODE)
|
||||
# define HAVE_RS485 1
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_RS485
|
||||
# define USART_TX_INTS (USART_INT_DRE | USART_INT_TXC)
|
||||
#else
|
||||
# define USART_TX_INTS (USART_INT_DRE)
|
||||
#endif
|
||||
|
||||
/************************************************************************************
|
||||
* Public Types
|
||||
************************************************************************************/
|
||||
|
||||
Reference in New Issue
Block a user