零基础开发小安派-Eyes-S1【外设篇】——UART

#define UART_INTSTS_TX_END  (1 << 0)#define UART_INTSTS_RX_END  (1 << 1)#define UART_INTSTS_TX_FIFO (1 << 2)#define UART_INTSTS_RX_FIFO (1 << 3)#define UART_INTSTS_RTO     (1 << 4)#define UART_INTSTS_PCE     (1 << 5)#define UART_INTSTS_TX_FER  (1 << 6)#define UART_INTSTS_RX_FER  (1 << 7)#if !defined(BL602)#define UART_INTSTS_RX_LSE (1 << 8)#endif#if !defined(BL602) && !defined(BL702)#define UART_INTSTS_RX_BCR (1 << 9)#define UART_INTSTS_RX_ADS (1 << 10)#define UART_INTSTS_RX_AD5 (1 << 11)#endif

void bflb_uart_int_clear(struct bflb_device_s *dev, uint32_t int_clear);

#define UART_INTCLR_TX_END (1 << 0)#define UART_INTCLR_RX_END (1 << 1)#define UART_INTCLR_RTO    (1 << 4)#define UART_INTCLR_PCE    (1 << 5)#if !defined(BL602)#define UART_INTCLR_RX_LSE (1 << 8)#endif#if !defined(BL602) && !defined(BL702)#define UART_INTCLR_RX_BCR (1 << 9)#define UART_INTCLR_RX_ADS (1 << 10)#define UART_INTCLR_RX_AD5 (1 << 11)#endif

int bflb_uart_feature_control(struct bflb_device_s *dev, int cmd, size_t arg);

#define UART_CMD_SET_BAUD_RATE           (0x01)#define UART_CMD_SET_DATA_BITS           (0x02)#define UART_CMD_SET_STOP_BITS           (0x03)#define UART_CMD_SET_PARITY_BITS         (0x04)#define UART_CMD_CLR_TX_FIFO             (0x05)#define UART_CMD_CLR_RX_FIFO             (0x06)#define UART_CMD_SET_RTO_VALUE           (0x07)#define UART_CMD_SET_RTS_VALUE           (0x08)#define UART_CMD_GET_TX_FIFO_CNT         (0x09)#define UART_CMD_GET_RX_FIFO_CNT         (0x0a)#define UART_CMD_SET_AUTO_BAUD           (0x0b)#define UART_CMD_GET_AUTO_BAUD           (0x0c)#define UART_CMD_SET_BREAK_VALUE         (0x0d)#define UART_CMD_SET_TX_LIN_VALUE        (0x0e)#define UART_CMD_SET_RX_LIN_VALUE        (0x0f)#define UART_CMD_SET_TX_RX_EN            (0x10)#define UART_CMD_SET_TX_RS485_EN         (0x11)#define UART_CMD_SET_TX_RS485_POLARITY   (0x12)#define UART_CMD_SET_ABR_ALLOWABLE_ERROR (0x13)#define UART_CMD_SET_SW_RTS_CONTROL      (0x14)#define UART_CMD_IR_CONFIG               (0x15)#define UART_CMD_SET_TX_FREERUN          (0x16)#define UART_CMD_SET_TX_END_INTERRUPT    (0x17)#define UART_CMD_SET_RX_END_INTERRUPT    (0x18)#define UART_CMD_SET_TX_TRANSFER_LEN     (0x19)#define UART_CMD_SET_RX_TRANSFER_LEN     (0x20)#define UART_CMD_SET_TX_EN               (0x21)#define UART_CMD_SET_BCR_END_INTERRUPT   (0x22)#define UART_CMD_GET_BCR_COUNT           (0x23)

//头文件#include "bflb_mtimer.h"#include "bflb_uart.h"#include "bflb_gpio.h"#include "board.h"
//设置名为uart1的外设句柄struct bflb_device_s *uart1;
//定义需要轮询发送的数据static uint8_t uart_txbuf[4] = { 0,1,2,3 };
void uart_isr(int irq, void *arg);
//初始化串口配置，如波特率，数据位和停止位//tx_fifo_threshold 和 rx_fifo_threshold 参数设置表示为fifo中断的触发阈值
static void uart_init(void){    struct bflb_device_s* gpio;    struct bflb_uart_config_s cfg = {        .baudrate = 115200,        .data_bits = UART_DATA_BITS_8,        .stop_bits = UART_STOP_BITS_1,        .parity = UART_PARITY_NONE,        .flow_ctrl = 0,        .tx_fifo_threshold = 4,        .rx_fifo_threshold = 4,    };
    gpio = bflb_device_get_by_name("gpio");    uart1 = bflb_device_get_by_name("uart1");
    //将GPIO_1和GPIO_0设置为TX和RX
    bflb_gpio_uart_init(gpio, GPIO_PIN_1, GPIO_UART_FUNC_UART1_TX);    bflb_gpio_uart_init(gpio, GPIO_PIN_0, GPIO_UART_FUNC_UART1_RX);
    bflb_uart_init(uart1, &cfg);
    bflb_uart_txint_mask(uart1, true);    bflb_uart_rxint_mask(uart1, false);    bflb_irq_attach(uart1->irq_num, uart_isr, NULL);    bflb_irq_enable(uart1->irq_num);
}
//中断服务函数，触发中断后会进入该函数
void uart_isr(int irq, void *arg){    uint32_t intstatus = bflb_uart_get_intstatus(uart1);
   //这里注释了fifo管道的RX中断触发，fifo的触发方式也就是上面设置的字节数4，也就是要接收4个字节以上数据才会触发fifo中断
    // if (intstatus & UART_INTSTS_RX_FIFO) {    //     printf("rx fifo\r\n");    //     while (bflb_uart_rxavailable(uart1)) {    //         printf("0x%02x\r\n", bflb_uart_getchar(uart1));    //     }    // }
   //接收超时中断，当一段时间内数据没有接收后便会停止，在触发中断后，轮询使用prtintf发送uart1接收到的字符，停止接收后清空中断标志等待下一次发送
    if (intstatus & UART_INTSTS_RTO) {        printf("rto\r\n");        while (bflb_uart_rxavailable(uart1)) {            printf("0x%02x\r\n", bflb_uart_getchar(uart1));        }        bflb_uart_int_clear(uart1, UART_INTCLR_RTO);    }}
int main(void){    board_init();    uart_init();        //主函数每两秒轮询一次发送 uart_txbuf 数据      while (1) {        bflb_mtimer_delay_ms(2000);        bflb_uart_put(uart1,uart_txbuf,4);    }}