GD32F150G8 USART1 REA接收状态无法使能

2021-3-4 15:33

void rs422_uart_init(uint32_t baudrate, uint16_t data_bits,uint16_t parity, uint16_t stopbits)
{

rcu_periph_clock_enable(AS32_GPIO_RX_RCC);
rcu_periph_clock_enable(AS32_GPIO_TX_RCC);

rcu_periph_clock_enable(AS32_UART_RCC);

/* connect port to USARTx_Tx */
gpio_af_set(AS32_GPIO_TX_PORT, AS32_UART_AF, AS32_GPIO_TX_PIN);

/* connect port to USARTx_Rx */
gpio_af_set(AS32_GPIO_RX_PORT, AS32_UART_AF, AS32_GPIO_RX_PIN);

/* configure USART Tx as alternate function push-pull */
gpio_mode_set(AS32_GPIO_TX_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, AS32_GPIO_TX_PIN);
gpio_output_options_set(AS32_GPIO_TX_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, AS32_GPIO_TX_PIN);

/* configure USART Rx as alternate function push-pull */
gpio_mode_set(AS32_GPIO_RX_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, AS32_GPIO_RX_PIN);
gpio_output_options_set(AS32_GPIO_RX_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, AS32_GPIO_RX_PIN);

usart_deinit(AS32_UART);
usart_baudrate_set(AS32_UART, baudrate);
usart_transmit_config(AS32_UART, USART_TRANSMIT_ENABLE);
usart_receive_config(AS32_UART, USART_RECEIVE_ENABLE);

nvic_irq_enable(AS32_UART_IRQ, 1, 1);

#ifdef AS32_DIR_PORT
rcu_periph_clock_enable(AS32_DIR_RCC);
gpio_output_options_set(AS32_DIR_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, AS32_DIR_PIN);
gpio_mode_set(AS32_DIR_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, AS32_DIR_PIN);
gpio_bit_reset(AS32_DIR_PORT, AS32_DIR_PIN);
#endif
usart_interrupt_flag_clear(RS485_UART,USART_INT_FLAG_RBNE_ORERR);
usart_interrupt_enable(AS32_UART,USART_INT_RBNE);

usart_enable(AS32_UART);
usart_transmit_config(AS32_UART, USART_TRANSMIT_ENABLE);
usart_receive_config(AS32_UART, USART_RECEIVE_ENABLE);
}
ST-link 调试，寄存器STAT REA位，没法变换为1 ，也就是接收核心部分没有工作，
同样的代码使用USART0 就可以，这是为什么？

2021-3-4 15:43

CTL0 的TEN REN UEN 都为1，但是 STAT 的 REA为0， TEA为1 ，并且后面运行过程中一致为0.
是哪里设置错误吗？

2021-3-4 15:45

#define AS32_UART USART1
#define AS32_UART_IRQ USART1_IRQn
#define AS32_UART_RCC RCU_USART1
#define AS32_UART_AF GPIO_AF_1

#define AS32_GPIO_TX_RCC RCU_GPIOA
#define AS32_GPIO_TX_PORT GPIOA
#define AS32_GPIO_TX_PIN GPIO_PIN_2
#define AS32_GPIO_RX_RCC RCU_GPIOA
#define AS32_GPIO_RX_PORT GPIOA
#define AS32_GPIO_RX_PIN GPIO_PIN_3

从逻辑分析仪上能看到，能够发送出数据，但无法接收数据