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rt-thread-official/bsp/stm32f40x/drivers/usart.c

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/*
* File : usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2009-01-05 Bernard the first version
* 2010-03-29 Bernard remove interrupt Tx and DMA Rx mode
* 2012-02-08 aozima update for F4.
* 2012-07-28 aozima update for ART board.
* 2016-05-28 armink add DMA Rx mode
*/
#include "stm32f4xx.h"
#include "usart.h"
#include "board.h"
#include <rtdevice.h>
/* UART GPIO define. */
#define UART1_GPIO_TX GPIO_Pin_6
#define UART1_TX_PIN_SOURCE GPIO_PinSource6
#define UART1_GPIO_RX GPIO_Pin_7
#define UART1_RX_PIN_SOURCE GPIO_PinSource7
#define UART1_GPIO GPIOB
#define UART1_GPIO_RCC RCC_AHB1Periph_GPIOB
#define RCC_APBPeriph_UART1 RCC_APB2Periph_USART1
#define UART2_GPIO_TX GPIO_Pin_2
#define UART2_TX_PIN_SOURCE GPIO_PinSource2
#define UART2_GPIO_RX GPIO_Pin_3
#define UART2_RX_PIN_SOURCE GPIO_PinSource3
#define UART2_GPIO GPIOA
#define UART2_GPIO_RCC RCC_AHB1Periph_GPIOA
#define RCC_APBPeriph_UART2 RCC_APB1Periph_USART2
#define UART3_GPIO_TX GPIO_Pin_8
#define UART3_TX_PIN_SOURCE GPIO_PinSource8
#define UART3_GPIO_RX GPIO_Pin_9
#define UART3_RX_PIN_SOURCE GPIO_PinSource9
#define UART3_GPIO GPIOD
#define UART3_GPIO_RCC RCC_AHB1Periph_GPIOD
#define RCC_APBPeriph_UART3 RCC_APB1Periph_USART3
#define UART4_GPIO_TX GPIO_Pin_10
#define UART4_TX_PIN_SOURCE GPIO_PinSource10
#define UART4_GPIO_RX GPIO_Pin_11
#define UART4_RX_PIN_SOURCE GPIO_PinSource11
#define UART4_GPIO GPIOC
#define UART4_GPIO_RCC RCC_AHB1Periph_GPIOC
#define RCC_APBPeriph_UART4 RCC_APB1Periph_UART4
#define UART5_GPIO_TX GPIO_Pin_12
#define UART5_TX_PIN_SOURCE GPIO_PinSource12
#define UART5_GPIO_RX GPIO_Pin_2
#define UART5_RX_PIN_SOURCE GPIO_PinSource2
#define UART5_TX GPIOC
#define UART5_RX GPIOD
#define UART5_GPIO_RCC_TX RCC_AHB1Periph_GPIOC
#define UART5_GPIO_RCC_RX RCC_AHB1Periph_GPIOD
#define RCC_APBPeriph_UART5 RCC_APB1Periph_UART5
/* STM32 uart driver */
struct stm32_uart
{
USART_TypeDef *uart_device;
IRQn_Type irq;
struct stm32_uart_dma
{
/* dma stream */
DMA_Stream_TypeDef *rx_stream;
/* dma channel */
uint32_t rx_ch;
/* dma flag */
uint32_t rx_flag;
/* dma irq channel */
uint8_t rx_irq_ch;
/* setting receive len */
rt_size_t setting_recv_len;
/* last receive index */
rt_size_t last_recv_index;
} dma;
};
static void DMA_Configuration(struct rt_serial_device *serial);
static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct stm32_uart* uart;
USART_InitTypeDef USART_InitStructure;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
USART_InitStructure.USART_BaudRate = cfg->baud_rate;
if (cfg->data_bits == DATA_BITS_8){
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
} else if (cfg->data_bits == DATA_BITS_9) {
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
}
if (cfg->stop_bits == STOP_BITS_1){
USART_InitStructure.USART_StopBits = USART_StopBits_1;
} else if (cfg->stop_bits == STOP_BITS_2){
USART_InitStructure.USART_StopBits = USART_StopBits_2;
}
if (cfg->parity == PARITY_NONE){
USART_InitStructure.USART_Parity = USART_Parity_No;
} else if (cfg->parity == PARITY_ODD) {
USART_InitStructure.USART_Parity = USART_Parity_Odd;
} else if (cfg->parity == PARITY_EVEN) {
USART_InitStructure.USART_Parity = USART_Parity_Even;
}
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(uart->uart_device, &USART_InitStructure);
/* Enable USART */
USART_Cmd(uart->uart_device, ENABLE);
return RT_EOK;
}
static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct stm32_uart* uart;
rt_uint32_t ctrl_arg = (rt_uint32_t)(arg);
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
UART_DISABLE_IRQ(uart->irq);
/* disable interrupt */
USART_ITConfig(uart->uart_device, USART_IT_RXNE, DISABLE);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_ENABLE_IRQ(uart->irq);
/* enable interrupt */
USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
break;
/* USART config */
case RT_DEVICE_CTRL_CONFIG :
if (ctrl_arg == RT_DEVICE_FLAG_DMA_RX) {
DMA_Configuration(serial);
}
}
return RT_EOK;
}
static int stm32_putc(struct rt_serial_device *serial, char c)
{
struct stm32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
while (!(uart->uart_device->SR & USART_FLAG_TXE));
uart->uart_device->DR = c;
return 1;
}
static int stm32_getc(struct rt_serial_device *serial)
{
int ch;
struct stm32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
ch = -1;
if (uart->uart_device->SR & USART_FLAG_RXNE)
{
ch = uart->uart_device->DR & 0xff;
}
return ch;
}
/**
* DMA initialize by DMA_InitStruct structure
*
* @param serial serial device
* @param setting_recv_len setting receive length
* @param mem_base_addr memory 0 base address for DMA stream
*/
static void dma_uart_config(struct rt_serial_device *serial, uint32_t setting_recv_len,
void *mem_base_addr)
{
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
DMA_InitTypeDef DMA_InitStructure;
/* rx dma config */
uart->dma.setting_recv_len = setting_recv_len;
DMA_DeInit(uart->dma.rx_stream);
while (DMA_GetCmdStatus(uart->dma.rx_stream) != DISABLE);
DMA_InitStructure.DMA_Channel = uart->dma.rx_ch;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(uart->uart_device->DR);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)mem_base_addr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = uart->dma.setting_recv_len;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(uart->dma.rx_stream, &DMA_InitStructure);
}
/**
* Serial port receive idle process. This need add to uart idle ISR.
*
* @param serial serial device
*/
static void dma_uart_rx_idle_isr(struct rt_serial_device *serial) {
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
rt_size_t recv_total_index, recv_len;
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_total_index = uart->dma.setting_recv_len - DMA_GetCurrDataCounter(uart->dma.rx_stream);
recv_len = recv_total_index - uart->dma.last_recv_index;
uart->dma.last_recv_index = recv_total_index;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len) rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
/* read a data for clear receive idle interrupt flag */
USART_ReceiveData(uart->uart_device);
}
/**
* DMA receive done process. This need add to DMA receive done ISR.
*
* @param serial serial device
*/
static void dma_rx_done_isr(struct rt_serial_device *serial)
{
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
rt_size_t recv_len;
rt_base_t level;
if (DMA_GetFlagStatus(uart->dma.rx_stream, uart->dma.rx_flag) != RESET)
{
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index;
/* reset last recv index */
uart->dma.last_recv_index = 0;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len) rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
/* start receive data */
DMA_ClearFlag(uart->dma.rx_stream, uart->dma.rx_flag);
}
}
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
}
if(USART_GetITStatus(uart->uart_device, USART_IT_IDLE) != RESET)
{
dma_uart_rx_idle_isr(serial);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
}
if (USART_GetFlagStatus(uart->uart_device, USART_FLAG_ORE) == SET)
{
USART_ReceiveData(uart->uart_device);
}
}
static const struct rt_uart_ops stm32_uart_ops =
{
stm32_configure,
stm32_control,
stm32_putc,
stm32_getc,
};
#if defined(RT_USING_UART1)
/* UART1 device driver structure */
struct stm32_uart uart1 =
{
USART1,
USART1_IRQn,
{
DMA2_Stream5,
DMA_Channel_4,
DMA_FLAG_TCIF5,
DMA2_Stream5_IRQn,
0,
},
};
struct rt_serial_device serial1;
void USART1_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA2_Stream5_IRQHandler(void) {
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */
#if defined(RT_USING_UART2)
/* UART2 device driver structure */
struct stm32_uart uart2 =
{
USART2,
USART2_IRQn,
{
DMA1_Stream5,
DMA_Channel_4,
DMA_FLAG_TCIF5,
DMA1_Stream5_IRQn,
0,
0,
},
};
struct rt_serial_device serial2;
void USART2_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial2);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Stream5_IRQHandler(void) {
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial2);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART2 */
#if defined(RT_USING_UART3)
/* UART3 device driver structure */
struct stm32_uart uart3 =
{
USART3,
USART3_IRQn,
{
DMA1_Stream1,
DMA_Channel_4,
DMA_FLAG_TCIF1,
DMA1_Stream1_IRQn,
0,
0,
},
};
struct rt_serial_device serial3;
void USART3_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial3);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Stream1_IRQHandler(void) {
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial3);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART3 */
#if defined(RT_USING_UART4)
/* UART4 device driver structure */
struct stm32_uart uart4 =
{
UART4,
UART4_IRQn,
{
DMA1_Stream2,
DMA_Channel_4,
DMA_FLAG_TCIF2,
DMA1_Stream2_IRQn,
0,
0,
},
};
struct rt_serial_device serial4;
void UART4_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial4);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Stream2_IRQHandler(void) {
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial4);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART4 */
#if defined(RT_USING_UART5)
/* UART5 device driver structure */
struct stm32_uart uart5 =
{
UART5,
UART5_IRQn,
{
DMA1_Stream0,
DMA_Channel_4,
DMA_FLAG_TCIF0,
DMA1_Stream0_IRQn,
0,
0,
},
};
struct rt_serial_device serial5;
void UART5_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial5);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Stream0_IRQHandler(void) {
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial5);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART5 */
static void RCC_Configuration(void)
{
#ifdef RT_USING_UART1
/* Enable UART1 GPIO clocks */
RCC_AHB1PeriphClockCmd(UART1_GPIO_RCC, ENABLE);
/* Enable UART1 clock */
RCC_APB2PeriphClockCmd(RCC_APBPeriph_UART1, ENABLE);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
/* Enable UART2 GPIO clocks */
RCC_AHB1PeriphClockCmd(UART2_GPIO_RCC, ENABLE);
/* Enable UART2 clock */
RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART2, ENABLE);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART3
/* Enable UART3 GPIO clocks */
RCC_AHB1PeriphClockCmd(UART3_GPIO_RCC, ENABLE);
/* Enable UART3 clock */
RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART3, ENABLE);
#endif /* RT_USING_UART3 */
#ifdef RT_USING_UART4
/* Enable UART4 GPIO clocks */
RCC_AHB1PeriphClockCmd(UART4_GPIO_RCC, ENABLE);
/* Enable UART4 clock */
RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART4, ENABLE);
#endif /* RT_USING_UART4 */
#ifdef RT_USING_UART5
/* Enable UART5 GPIO clocks */
RCC_AHB1PeriphClockCmd(UART5_GPIO_RCC_TX | UART5_GPIO_RCC_RX, ENABLE);
/* Enable UART5 clock */
RCC_APB1PeriphClockCmd(RCC_APBPeriph_UART5, ENABLE);
#endif /* RT_USING_UART5 */
}
static void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
#ifdef RT_USING_UART1
/* Configure USART1 Rx/tx PIN */
GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX | UART1_GPIO_TX;
/* Connect alternate function */
GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PIN_SOURCE, GPIO_AF_USART1);
GPIO_PinAFConfig(UART1_GPIO, UART1_RX_PIN_SOURCE, GPIO_AF_USART1);
GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
/* Configure USART2 Rx/tx PIN */
GPIO_InitStructure.GPIO_Pin = UART2_GPIO_RX | UART2_GPIO_TX;
/* Connect alternate function */
GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PIN_SOURCE, GPIO_AF_USART2);
GPIO_PinAFConfig(UART2_GPIO, UART2_RX_PIN_SOURCE, GPIO_AF_USART2);
GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
#endif /* RT_USING_UART2 */
#ifdef RT_USING_UART3
/* Configure USART3 Rx/tx PIN */
GPIO_InitStructure.GPIO_Pin = UART3_GPIO_TX | UART3_GPIO_RX;
/* Connect alternate function */
GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PIN_SOURCE, GPIO_AF_USART3);
GPIO_PinAFConfig(UART3_GPIO, UART3_RX_PIN_SOURCE, GPIO_AF_USART3);
GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
#endif /* RT_USING_UART3 */
#ifdef RT_USING_UART4
/* Configure USART4 Rx/tx PIN */
GPIO_InitStructure.GPIO_Pin = UART4_GPIO_TX | UART4_GPIO_RX;
/* Connect alternate function */
GPIO_PinAFConfig(UART4_GPIO, UART4_TX_PIN_SOURCE, GPIO_AF_UART4);
GPIO_PinAFConfig(UART4_GPIO, UART4_RX_PIN_SOURCE, GPIO_AF_UART4);
GPIO_Init(UART4_GPIO, &GPIO_InitStructure);
#endif /* RT_USING_UART4 */
#ifdef RT_USING_UART5
/* Configure USART5 Rx/tx PIN */
GPIO_InitStructure.GPIO_Pin = UART5_GPIO_TX;
/* Connect alternate function */
GPIO_PinAFConfig(UART5_TX, UART5_TX_PIN_SOURCE, GPIO_AF_UART5);
GPIO_Init(UART5_TX, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = UART5_GPIO_RX;
GPIO_PinAFConfig(UART5_RX, UART5_RX_PIN_SOURCE, GPIO_AF_UART5);
GPIO_Init(UART5_RX, &GPIO_InitStructure);
#endif /* RT_USING_UART5 */
}
static void NVIC_Configuration(struct stm32_uart *uart)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = uart->irq;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
static void DMA_Configuration(struct rt_serial_device *serial) {
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
NVIC_InitTypeDef NVIC_InitStructure;
/* enable transmit idle interrupt */
USART_ITConfig(uart->uart_device, USART_IT_IDLE , ENABLE);
/* DMA clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
/* rx dma config */
dma_uart_config(serial, serial->config.bufsz, rx_fifo->buffer);
DMA_ClearFlag(uart->dma.rx_stream, uart->dma.rx_flag);
DMA_ITConfig(uart->dma.rx_stream, DMA_IT_TC, ENABLE);
USART_DMACmd(uart->uart_device, USART_DMAReq_Rx, ENABLE);
DMA_Cmd(uart->dma.rx_stream, ENABLE);
/* rx dma interrupt config */
NVIC_InitStructure.NVIC_IRQChannel = uart->dma.rx_irq_ch;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int stm32_hw_usart_init(void)
{
struct stm32_uart *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
RCC_Configuration();
GPIO_Configuration();
#ifdef RT_USING_UART1
uart = &uart1;
serial1.ops = &stm32_uart_ops;
serial1.config = config;
NVIC_Configuration(&uart1);
/* register UART1 device */
rt_hw_serial_register(&serial1,
"uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
uart = &uart2;
serial2.ops = &stm32_uart_ops;
serial2.config = config;
NVIC_Configuration(&uart2);
/* register UART1 device */
rt_hw_serial_register(&serial2,
"uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* RT_USING_UART2 */
#ifdef RT_USING_UART3
uart = &uart3;
serial3.ops = &stm32_uart_ops;
serial3.config = config;
NVIC_Configuration(&uart3);
/* register UART3 device */
rt_hw_serial_register(&serial3,
"uart3",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* RT_USING_UART3 */
#ifdef RT_USING_UART4
uart = &uart4;
serial4.ops = &stm32_uart_ops;
serial4.config = config;
NVIC_Configuration(&uart4);
/* register UART4 device */
rt_hw_serial_register(&serial4,
"uart4",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* RT_USING_UART4 */
#ifdef RT_USING_UART5
uart = &uart5;
serial5.ops = &stm32_uart_ops;
serial5.config = config;
NVIC_Configuration(&uart5);
/* register UART5 device */
rt_hw_serial_register(&serial5,
"uart5",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* RT_USING_UART5 */
return 0;
}
INIT_BOARD_EXPORT(stm32_hw_usart_init);
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