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rt-thread-official/bsp/gd32103c-eval/drivers/drv_usart.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-01-04 iysheng first version
*/
#include <gd32f10x.h>
#include <drv_usart.h>
#include <board.h>
#ifdef RT_USING_SERIAL
#if !defined(BSP_USING_UART0) && !defined(BSP_USING_UART1) && \
!defined(BSP_USING_UART2) && !defined(BSP_USING_UART3) && \
!defined(BSP_USING_UART4)
#error "Please define at least one UARTx"
#endif
#include <rtdevice.h>
static void uart_isr(struct rt_serial_device *serial);
#if defined(BSP_USING_UART0)
struct rt_serial_device serial0;
void USART0_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial0);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART0 */
#if defined(BSP_USING_UART1)
struct rt_serial_device serial1;
void USART1_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART1 */
#if defined(BSP_USING_UART2)
struct rt_serial_device serial2;
void USART2_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial2);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART2 */
#if defined(BSP_USING_UART3)
struct rt_serial_device serial3;
void UART3_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial3);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART3 */
#if defined(BSP_USING_UART4)
struct rt_serial_device serial4;
void UART4_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial4);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART4 */
static const struct gd32_uart uarts[] = {
#ifdef BSP_USING_UART0
{
USART0, /* uart peripheral index */
USART0_IRQn, /* uart iqrn */
RCU_USART0, RCU_GPIOA, RCU_GPIOA, /* periph clock, tx gpio clock, rt gpio clock */
GPIOA, GPIOA, /* tx port, tx alternate, tx pin */
GPIO_PIN_9, GPIO_PIN_10, /* rx port, rx alternate, rx pin */
&serial0,
"uart0",
},
#endif
#ifdef BSP_USING_UART1
{
USART1, /* uart peripheral index */
USART1_IRQn, /* uart iqrn */
RCU_USART1, RCU_GPIOA, RCU_GPIOA, /* periph clock, tx gpio clock, rt gpio clock */
GPIOA, GPIOA, /* tx port, tx alternate, tx pin */
GPIO_PIN_2, GPIO_PIN_3, /* rx port, rx alternate, rx pin */
&serial1,
"uart1",
},
#endif
#ifdef BSP_USING_UART2
{
USART2, /* uart peripheral index */
USART2_IRQn, /* uart iqrn */
RCU_USART2, RCU_GPIOB, RCU_GPIOB, /* periph clock, tx gpio clock, rt gpio clock */
GPIOB, GPIOB, /* tx port, tx alternate, tx pin */
GPIO_PIN_10, GPIO_PIN_11, /* rx port, rx alternate, rx pin */
&serial2,
"uart2",
},
#endif
#ifdef BSP_USING_UART3
{
UART3, /* uart peripheral index */
UART3_IRQn, /* uart iqrn */
RCU_UART3, RCU_GPIOC, RCU_GPIOC, /* periph clock, tx gpio clock, rt gpio clock */
GPIOC, GPIOC, /* tx port, tx alternate, tx pin */
GPIO_PIN_10, GPIO_PIN_11, /* rx port, rx alternate, rx pin */
&serial3,
"uart3",
},
#endif
#ifdef BSP_USING_UART4
{
UART4, /* uart peripheral index */
UART4_IRQn, /* uart iqrn */
RCU_UART4, RCU_GPIOC, RCU_GPIOD, /* periph clock, tx gpio clock, rt gpio clock */
GPIOC, GPIOD, /* tx port, tx alternate, tx pin */
GPIO_PIN_12, GPIO_PIN_2, /* rx port, rx alternate, rx pin */
&serial4,
"uart4",
},
#endif
};
/**
* @brief UART MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* - Peripheral's GPIO Configuration
* - NVIC configuration for UART interrupt request enable
* @param huart: UART handle pointer
* @retval None
*/
void gd32_uart_gpio_init(struct gd32_uart *uart)
{
GPIO_TypeDef *GPIOx;
GPIO_InitPara GPIO_InitStructure = {0};
/* enable USART clock */
rcu_periph_clock_enable(uart->tx_gpio_clk);
rcu_periph_clock_enable(uart->rx_gpio_clk);
rcu_periph_clock_enable(uart->per_clk);
GPIOx = (GPIO_TypeDef *)uart->tx_port;
GPIO_InitStructure.GPIO_Pin = uart->tx_pin;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_10MHZ;
GPIO_Init(GPIOx, &GPIO_InitStructure);
/* TODO 初始化 RX */
GPIOx = (GPIO_TypeDef *)uart->rx_port;
GPIO_InitStructure.GPIO_Pin = uart->rx_pin;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_10MHZ;
GPIO_Init(GPIOx, &GPIO_InitStructure);
NVIC_SetPriority(uart->irqn, 0);
NVIC_EnableIRQ(uart->irqn);
}
static rt_err_t gd32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct gd32_uart *uart;
USART_TypeDef *USARTx;
USART_InitPara USART_InitParaStruct = {0};
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct gd32_uart *)serial->parent.user_data;
gd32_uart_gpio_init(uart);
USARTx = (USART_TypeDef *)uart->uart_periph;
USART_InitParaStruct.USART_BRR = cfg->baud_rate;
switch (cfg->data_bits) {
case DATA_BITS_9:
USART_InitParaStruct.USART_WL = USART_WL_9B;
break;
default:
USART_InitParaStruct.USART_WL = USART_WL_8B;
break;
}
switch (cfg->stop_bits) {
case STOP_BITS_2:
USART_InitParaStruct.USART_STBits = USART_STBITS_2;
break;
default:
USART_InitParaStruct.USART_STBits = USART_STBITS_1;
break;
}
switch (cfg->parity) {
case PARITY_ODD:
USART_InitParaStruct.USART_Parity = USART_PARITY_SETODD;
break;
case PARITY_EVEN:
USART_InitParaStruct.USART_Parity = USART_PARITY_SETEVEN;
break;
default:
USART_InitParaStruct.USART_Parity = USART_PARITY_RESET;
break;
}
USART_InitParaStruct.USART_HardwareFlowControl = USART_HARDWAREFLOWCONTROL_NONE;
USART_InitParaStruct.USART_RxorTx = USART_RXORTX_RX | USART_RXORTX_TX;
USART_Init(USARTx, &USART_InitParaStruct);
USART_Enable(USARTx, ENABLE);
return RT_EOK;
}
static rt_err_t gd32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct gd32_uart *uart;
USART_TypeDef *USARTx;
RT_ASSERT(serial != RT_NULL);
uart = (struct gd32_uart *)serial->parent.user_data;
USARTx = (USART_TypeDef *)uart->uart_periph;
switch (cmd) {
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
NVIC_DisableIRQ(uart->irqn);
/* disable interrupt */
USART_INT_Set(USARTx, USART_INT_RBNE, DISABLE);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
NVIC_EnableIRQ(uart->irqn);
/* enable interrupt */
USART_INT_Set(USARTx, USART_INT_RBNE, ENABLE);
break;
}
return RT_EOK;
}
static int gd32_putc(struct rt_serial_device *serial, char ch)
{
struct gd32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct gd32_uart *)serial->parent.user_data;
USART_DataSend((USART_TypeDef *)uart->uart_periph, ch);
while ((USART_GetBitState(uart->uart_periph, USART_FLAG_TC) == RESET));
return 1;
}
static int gd32_getc(struct rt_serial_device *serial)
{
int ch;
struct gd32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct gd32_uart *)serial->parent.user_data;
ch = -1;
if (USART_GetBitState(uart->uart_periph, USART_FLAG_RBNE) != RESET)
ch = USART_DataReceive(uart->uart_periph);
return ch;
}
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
struct gd32_uart *uart = (struct gd32_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
if ((USART_GetIntBitState((USART_TypeDef *)uart->uart_periph, USART_INT_RBNE) != RESET) &&
(USART_GetBitState((USART_TypeDef *)uart->uart_periph, USART_FLAG_RBNE) != RESET)) {
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
/* Clear RXNE interrupt flag */
USART_ClearBitState(uart->uart_periph, USART_FLAG_RBNE);
}
}
static const struct rt_uart_ops gd32_uart_ops = {
gd32_configure,
gd32_control,
gd32_putc,
gd32_getc,
};
int gd32_hw_usart_init(void)
{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
int i;
for (i = 0; i < sizeof(uarts) / sizeof(uarts[0]); i++) {
uarts[i].serial->ops = &gd32_uart_ops;
uarts[i].serial->config = config;
/* register UART device */
rt_hw_serial_register(uarts[i].serial,
uarts[i].device_name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
(void *)&uarts[i]);
}
return 0;
}
INIT_BOARD_EXPORT(gd32_hw_usart_init);
#endif
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