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rt-thread-official/bsp/wch/risc-v/Libraries/ch32_drivers/drv_usart.c

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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2009-01-05 Bernard the first version
* 2010-03-29 Bernard remove interrupt Tx and DMA Rx mode
* 2013-05-13 aozima update for kehong-lingtai.
* 2015-01-31 armink make sure the serial transmit complete in putc()
* 2016-05-13 armink add DMA Rx mode
* 2017-01-19 aubr.cool add interrupt Tx mode
* 2017-04-13 aubr.cool correct Rx parity err
* 2017-10-20 ZYH porting to HAL Libraries(with out DMA)
* 2017-11-15 ZYH update to 3.0.0
*/
#include "board.h"
#include <rtdevice.h>
#include <drv_usart.h>
/* uart driver */
struct ch32_uart
{
USART_InitTypeDef huart;
USART_TypeDef *USARTx;
IRQn_Type irq;
};
static rt_err_t ch32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct ch32_uart *uart;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct ch32_uart *)serial->parent.user_data;
uart->huart.USART_BaudRate = cfg->baud_rate;
uart->huart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
uart->huart.USART_Mode = USART_Mode_Rx|USART_Mode_Tx;
switch (cfg->data_bits)
{
case DATA_BITS_8:
uart->huart.USART_WordLength = USART_WordLength_8b;
break;
case DATA_BITS_9:
uart->huart.USART_WordLength = USART_WordLength_9b;
break;
default:
uart->huart.USART_WordLength = USART_WordLength_8b;
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_1:
uart->huart.USART_StopBits = USART_StopBits_1;
break;
case STOP_BITS_2:
uart->huart.USART_StopBits = USART_StopBits_2;
break;
default:
uart->huart.USART_StopBits = USART_StopBits_1;
break;
}
switch (cfg->parity)
{
case PARITY_NONE:
uart->huart.USART_Parity = USART_Parity_No;
break;
case PARITY_ODD:
uart->huart.USART_Parity = USART_Parity_Odd;
break;
case PARITY_EVEN:
uart->huart.USART_Parity = USART_Parity_Even;
break;
default:
uart->huart.USART_Parity = USART_Parity_No;
break;
}
if(uart->USARTx == USART1)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_Init(uart->USARTx,&uart->huart);
USART_Cmd(uart->USARTx, ENABLE);
}
return RT_EOK;
}
static rt_err_t ch32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct ch32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct ch32_uart *)serial->parent.user_data;
switch (cmd)
{
/* disable interrupt */
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
NVIC_DisableIRQ(uart->irq);
/* disable interrupt */
USART_ITConfig(uart->USARTx,USART_IT_RXNE,DISABLE);
break;
/* enable interrupt */
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
NVIC_EnableIRQ(uart->irq);
/* enable interrupt */
USART_ITConfig(uart->USARTx, USART_IT_RXNE,ENABLE);
break;
}
return RT_EOK;
}
static int ch32_putc(struct rt_serial_device *serial, char c)
{
struct ch32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct ch32_uart *)serial->parent.user_data;
while (USART_GetFlagStatus(uart->USARTx, USART_FLAG_TC) == RESET);
uart->USARTx->DATAR = c;
return 1;
}
static int ch32_getc(struct rt_serial_device *serial)
{
int ch;
struct ch32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct ch32_uart *)serial->parent.user_data;
ch = -1;
if (USART_GetFlagStatus(uart->USARTx, USART_FLAG_RXNE) != RESET)
{
ch = uart->USARTx->DATAR & 0xff;
}
return ch;
}
rt_size_t ch32dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction)
{
return RT_EOK;
}
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
struct ch32_uart *uart = (struct ch32_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
if (USART_GetITStatus(uart->USARTx, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
USART_ClearITPendingBit(uart->USARTx, USART_IT_RXNE);
}
}
static const struct rt_uart_ops ch32_uart_ops =
{
ch32_configure,
ch32_control,
ch32_putc,
ch32_getc,
ch32dma_transmit
};
#if defined(BSP_USING_UART1)
/* UART1 device driver structure */
struct ch32_uart uart1;
struct rt_serial_device serial1;
void USART1_IRQHandler(void) __attribute__((interrupt()));
void USART1_IRQHandler(void)
{
GET_INT_SP();
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
FREE_INT_SP();
}
#endif /* BSP_USING_UART1 */
int rt_hw_usart_init(void)
{
struct ch32_uart *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#if defined(BSP_USING_UART1)
uart=&uart1;
uart->irq=USART1_IRQn;
uart->USARTx=USART1;
config.baud_rate = BAUD_RATE_115200;
serial1.ops = &ch32_uart_ops;
serial1.config = config;
uart->huart.USART_BaudRate = 115200;
uart->huart.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
uart->huart.USART_Mode = USART_Mode_Rx|USART_Mode_Tx;
uart->huart.USART_WordLength = USART_WordLength_8b;
uart->huart.USART_StopBits = USART_StopBits_1;
uart->huart.USART_Parity = USART_Parity_No;
if(uart->USARTx == USART1)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_Init(uart->USARTx,&uart->huart);
USART_Cmd(uart->USARTx, ENABLE);
}
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
#endif /* BSP_USING_UART1 */
return 0;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);
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