rt-thread-official/bsp/at32/Libraries/rt_drivers/drv_usart.c

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2020-03-09 15:10:16 +08:00
/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-01-06 shelton first version
*/
#include <board.h>
#include "drv_usart.h"
#ifdef RT_USING_SERIAL
#if !defined(BSP_USING_UART1) && !defined(BSP_USING_UART2) && \
!defined(BSP_USING_UART3)
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#error "Please define at least one BSP_USING_UARTx"
/* this driver can be disabled at menuconfig <20><> RT-Thread Components <20><> Device Drivers */
#endif
struct at32_usart {
char *name;
USART_Type* usartx;
IRQn_Type irqn;
struct rt_serial_device serial;
};
enum {
#ifdef BSP_USING_UART1
USART1_INDEX,
#endif
#ifdef BSP_USING_UART2
USART2_INDEX,
#endif
#ifdef BSP_USING_UART3
USART3_INDEX,
#endif
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};
static struct at32_usart usart_config[] = {
#ifdef BSP_USING_UART1
{ "uart1",
USART1,
USART1_IRQn, },
#endif
#ifdef BSP_USING_UART2
{ "uart2",
USART2,
USART2_IRQn, },
#endif
#ifdef BSP_USING_UART3
{ "uart3",
USART3,
USART3_IRQn, },
#endif
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};
static rt_err_t at32_configure(struct rt_serial_device *serial,
struct serial_configure *cfg) {
struct at32_usart *usart_instance = (struct at32_usart *) serial->parent.user_data;
USART_InitType USART_InitStructure;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
RT_ASSERT(usart_instance != RT_NULL);
at32_msp_usart_init((void *)usart_instance->usartx);
USART_StructInit(&USART_InitStructure);
USART_Reset(usart_instance->usartx);
USART_InitStructure.USART_BaudRate = cfg->baud_rate;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
switch (cfg->data_bits) {
case DATA_BITS_8:
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
break;
case DATA_BITS_9:
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
break;
default:
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
break;
}
switch (cfg->stop_bits) {
case STOP_BITS_1:
USART_InitStructure.USART_StopBits = USART_StopBits_1;
break;
case STOP_BITS_2:
USART_InitStructure.USART_StopBits = USART_StopBits_2;
break;
default:
USART_InitStructure.USART_StopBits = USART_StopBits_1;
break;
}
switch (cfg->parity) {
case PARITY_NONE:
USART_InitStructure.USART_Parity = USART_Parity_No;
break;
case PARITY_ODD:
USART_InitStructure.USART_Parity = USART_Parity_Odd;
break;
case PARITY_EVEN:
USART_InitStructure.USART_Parity = USART_Parity_Even;
break;
default:
USART_InitStructure.USART_Parity = USART_Parity_No;
break;
}
USART_Init(usart_instance->usartx, &USART_InitStructure);
USART_Cmd(usart_instance->usartx, ENABLE);
return RT_EOK;
}
static rt_err_t at32_control(struct rt_serial_device *serial, int cmd,
void *arg) {
struct at32_usart *usart;
NVIC_InitType NVIC_InitStruct;
RT_ASSERT(serial != RT_NULL);
usart = (struct at32_usart *) serial->parent.user_data;
RT_ASSERT(usart != RT_NULL);
NVIC_InitStruct.NVIC_IRQChannel = usart->irqn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
switch (cmd) {
case RT_DEVICE_CTRL_CLR_INT:
NVIC_InitStruct.NVIC_IRQChannelCmd = DISABLE;
NVIC_Init(&NVIC_InitStruct);
USART_INTConfig(usart->usartx, USART_INT_RDNE, DISABLE);
break;
case RT_DEVICE_CTRL_SET_INT:
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
USART_INTConfig(usart->usartx, USART_INT_RDNE, ENABLE);
break;
}
return RT_EOK;
}
static int at32_putc(struct rt_serial_device *serial, char ch) {
struct at32_usart *usart;
RT_ASSERT(serial != RT_NULL);
usart = (struct at32_usart *) serial->parent.user_data;
RT_ASSERT(usart != RT_NULL);
USART_SendData(usart->usartx, (uint8_t) ch);
while (USART_GetFlagStatus(usart->usartx, USART_FLAG_TDE) == RESET);
return 1;
}
static int at32_getc(struct rt_serial_device *serial) {
int ch;
struct at32_usart *usart;
RT_ASSERT(serial != RT_NULL);
usart = (struct at32_usart *) serial->parent.user_data;
RT_ASSERT(usart != RT_NULL);
ch = -1;
if (RESET != USART_GetFlagStatus(usart->usartx, USART_FLAG_RDNE)) {
ch = USART_ReceiveData(usart->usartx) & 0xff;
}
return ch;
}
static const struct rt_uart_ops at32_usart_ops = {
at32_configure,
at32_control,
at32_putc,
at32_getc,
RT_NULL };
static void usart_isr(struct rt_serial_device *serial) {
struct at32_usart *usart_instance;
RT_ASSERT(serial != RT_NULL);
usart_instance = (struct at32_usart *) serial->parent.user_data;
RT_ASSERT(usart_instance != RT_NULL);
if ((USART_GetITStatus(usart_instance->usartx, USART_INT_RDNE) != RESET) \
&& (RESET != USART_GetFlagStatus(usart_instance->usartx, USART_FLAG_RDNE))) {
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
USART_ClearITPendingBit(usart_instance->usartx, USART_INT_RDNE);
USART_ClearFlag(usart_instance->usartx, USART_FLAG_RDNE);
} else {
if (USART_GetFlagStatus(usart_instance->usartx, USART_FLAG_CTSF) != RESET) {
USART_ClearFlag(usart_instance->usartx, USART_FLAG_CTSF);
}
if (USART_GetFlagStatus(usart_instance->usartx, USART_FLAG_LBDF) != RESET) {
USART_ClearFlag(usart_instance->usartx, USART_FLAG_LBDF);
}
if (USART_GetFlagStatus(usart_instance->usartx, USART_FLAG_TRAC) != RESET) {
USART_ClearFlag(usart_instance->usartx, USART_FLAG_TRAC);
}
}
}
#ifdef BSP_USING_UART1
void USART1_IRQHandler(void) {
rt_interrupt_enter();
usart_isr(&usart_config[USART1_INDEX].serial);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART2
void USART2_IRQHandler(void) {
rt_interrupt_enter();
usart_isr(&usart_config[USART2_INDEX].serial);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART3
void USART3_IRQHandler(void) {
rt_interrupt_enter();
usart_isr(&usart_config[USART3_INDEX].serial);
rt_interrupt_leave();
}
#endif
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int rt_hw_usart_init(void) {
rt_size_t obj_num;
int index;
obj_num = sizeof(usart_config) / sizeof(struct at32_usart);
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
rt_err_t result = 0;
for (index = 0; index < obj_num; index++) {
usart_config[index].serial.ops = &at32_usart_ops;
usart_config[index].serial.config = config;
/* register UART device */
result = rt_hw_serial_register(&usart_config[index].serial,
usart_config[index].name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX
| RT_DEVICE_FLAG_INT_TX, &usart_config[index]);
RT_ASSERT(result == RT_EOK);
}
return result;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);
#endif /* BSP_USING_SERIAL */
/******************** end of file *******************/