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boards/samv7/common: add support for UART RX DMA polling
This adds the support for RX DMA polling. The board initializes timer channel SAMV7_UART_RXDMA_POLL_TIMER with frequency SAMV7_UART_RXDMA_POLL_FREQUENCY that triggers DMA polling function. Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc
Xiang Xiao
parent
7af7655234
commit
4fa5e294ac
4 changed files with 339 additions and 0 deletions
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@ -62,6 +62,37 @@ config SAMV7_HSMCI0_MOUNT_MOUNTPOINT
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endif # SAMV7_HSMCI0_MOUNT
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config SAMV7_UART_RXDMA_POLL
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bool "Enable U(S)ART RX DMA Polling"
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default n
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depends on UART0_RXDMA || UART1_RXDMA || UART2_RXDMA || UART3_RXDMA || \
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UART4_RXDMA || USART0_RXDMA || USART1_RXDMA || USART2_RXDMA
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---help---
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UART peripheral with RX DMA need periodic polling that checks the received
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DMA buffers for received bytes that have not accumulated to the point
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where the DMA interrupt has triggered.
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if SAMV7_UART_RXDMA_POLL
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config SAMV7_UART_RXDMA_POLL_TIMER
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int "Timer channel to trigger polling"
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default 0
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range 0 11
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---help---
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The number of timer channel to trigger the polling. Values from 0 to 11
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are available. Be careful not to assign the same channel that is
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already configured to other peripheral (ADC trigger for example).
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config SAMV7_UART_RXDMA_POLL_FREQUENCY
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int "Timer frequency"
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default 1000
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---help---
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Frequency of the timer to trigger the polling. You might want to keep
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this reasonably low to avoid unnecessary overhead and negate
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DMA benefit.
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endif # SAMV7_UART_RXDMA_POLL
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config SAMV7_PROGMEM_OTA_PARTITION
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bool
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default n
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110
boards/arm/samv7/common/include/board_uart_rxdma_poll.h
Normal file
110
boards/arm/samv7/common/include/board_uart_rxdma_poll.h
Normal file
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@ -0,0 +1,110 @@
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/****************************************************************************
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* boards/arm/samv7/common/include/board_uart_rxdma_poll.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 __BOARDS_ARM_SAMV7_COMMON_INCLUDE_BOARD_UART_RXDMA_POLL_H
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#define __BOARDS_ARM_SAMV7_COMMON_INCLUDE_BOARD_UART_RXDMA_POLL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__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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/****************************************************************************
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* Public Functions Definitions
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****************************************************************************/
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/****************************************************************************
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* Name: board_uart_rxdma_poll_stop
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*
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* Description:
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* This function starts the timer polling UART.
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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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* None
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*
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****************************************************************************/
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void board_uart_rxdma_poll_start(void);
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/****************************************************************************
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* Name: board_uart_rxdma_poll_stop
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*
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* Description:
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* This function stops the timer polling UART. No resourses are freed,
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* time is just stopped and can be started again.
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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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* None
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*
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****************************************************************************/
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void board_uart_rxdma_poll_stop(void);
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/****************************************************************************
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* Name: board_uart_rxdma_poll_init
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*
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* Description:
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* This function initializes and starts the timer that is polling
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* UART/USART peripherals with RX DMA enabled.
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*
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* Input Parameters:
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* channel - Channel number (0-11, see TC_CHANx)
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* frequency - Timer frequency
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*
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* Returned Value:
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* 0 on success, negative value (errno) on ERROR.
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*
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****************************************************************************/
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int board_uart_rxdma_poll_init(int channel, uint32_t frequency);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __BOARDS_ARM_SAMV7_COMMON_INCLUDE_BOARD_UART_RXDMA_POLL_H */
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@ -46,6 +46,10 @@ ifeq ($(CONFIG_SAMV7_GPIO_ENC),y)
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CSRCS += sam_gpio_enc.c
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endif
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ifeq ($(CONFIG_SAMV7_UART_RXDMA_POLL),y)
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CSRCS += sam_uart_rxdma_poll.c
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endif
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DEPPATH += --dep-path src
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VPATH += :src
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CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)src
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194
boards/arm/samv7/common/src/sam_uart_rxdma_poll.c
Normal file
194
boards/arm/samv7/common/src/sam_uart_rxdma_poll.c
Normal file
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@ -0,0 +1,194 @@
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/****************************************************************************
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* boards/arm/samv7/common/src/sam_uart_rxdma_poll.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include "sam_tc.h"
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#include "sam_serial.h"
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#include "board_uart_rxdma_poll.h"
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#ifdef CONFIG_SAMV7_UART_RXDMA_POLL
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static TC_HANDLE poll_tc;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: timer_handler
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*
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* Description:
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* Timer interrupt callback.
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*
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* Input Parameters:
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* tch - The handle that represents the timer state
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* arg - An opaque argument provided when the interrupt was registered
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* sr - The value of the timer interrupt status register at the time
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* that the interrupt occurred.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void timer_handler(TC_HANDLE tch, void *arg, uint32_t sr)
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{
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sam_serial_dma_poll();
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_uart_rxdma_poll_stop
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*
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* Description:
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* This function starts the timer polling UART.
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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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* None
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*
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****************************************************************************/
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void board_uart_rxdma_poll_start(void)
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{
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sam_tc_start(poll_tc);
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}
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/****************************************************************************
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* Name: board_uart_rxdma_poll_stop
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*
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* Description:
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* This function stops the timer polling UART. No resourses are freed,
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* time is just stopped and can be started again.
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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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* None
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*
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****************************************************************************/
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void board_uart_rxdma_poll_stop(void)
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{
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sam_tc_stop(poll_tc);
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}
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/****************************************************************************
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* Name: board_uart_rxdma_poll_init
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*
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* Description:
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* This function initializes and starts the timer that is polling
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* UART/USART peripherals with RX DMA enabled.
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*
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* Input Parameters:
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* channel - Channel number (0-11, see TC_CHANx)
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* frequency - Timer frequency
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*
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* Returned Value:
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* 0 on success, negative value (errno) on ERROR.
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*
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****************************************************************************/
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int board_uart_rxdma_poll_init(int channel, uint32_t frequency)
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{
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int ret;
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uint32_t div;
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uint32_t tcclks;
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uint32_t actual;
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uint32_t mode;
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uint32_t fdiv;
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uint32_t regval;
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if (channel < TC_CHAN0 || channel > TC_CHAN11)
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{
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syslog(LOG_ERR, "Invalid channel number: %d", channel);
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return -1;
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}
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ret = sam_tc_clockselect(frequency, &tcclks, &actual);
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if (ret < 0)
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{
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syslog(LOG_ERR, "sam_tc_divisor failed: %d", ret);
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return ret;
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}
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div = BOARD_MCK_FREQUENCY / actual;
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/* Set the timer/counter waveform mode the clock input selected by
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* sam_tc_clockselect()
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*/
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mode = ((tcclks << TC_CMR_TCCLKS_SHIFT) | /* Use selected TCCLKS value */
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TC_CMR_WAVSEL_UPRC | /* UP mode w/ trigger on RC Compare */
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TC_CMR_WAVE); /* Wave mode */
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/* Now allocate and configure the channel */
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poll_tc = sam_tc_allocate(channel, mode);
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if (!poll_tc)
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{
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syslog(LOG_ERR, "Failed to allocate channel %d mode %08" PRIx32 "\n",
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channel, mode);
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return -EINVAL;
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}
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/* The divider returned by sam_tc_clockselect() is the reload value
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* that will achieve a 1Hz rate. We need to multiply this to get the
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* desired frequency. sam_tc_divisor() should have already assure
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* that we can do this without overflowing a 32-bit unsigned integer.
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*/
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fdiv = div * frequency;
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DEBUGASSERT(div > 0 && div <= fdiv); /* Will check for integer overflow */
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/* Calculate the actual counter value from this divider and the tc input
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* frequency.
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*/
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regval = BOARD_MCK_FREQUENCY / fdiv;
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sam_tc_setregister(poll_tc, TC_REGC, regval);
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sam_tc_attach(poll_tc, timer_handler, NULL, TC_INT_CPCS);
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/* And start the timer */
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sam_tc_start(poll_tc);
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return 0;
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}
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#endif /* SAMV7_UART_RXDMA_POLL */
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