UART

更新时间：2019-01-25 14:41:26

接口列表

接口详情

int32_t hal_uart_init(uart_dev_t *uart)

int32_t hal_uart_send(uart_dev_t uart, const void data, uint32_t size, uint32_t timeout)

int32_t hal_uart_recv(uart_dev_t uart, void data, uint32_t expect_size, uint32_t timeout)

int32_t hal_uart_recv_II(uart_dev_t uart, void data, uint32_t expect_size, uint32_t *recv_size, uint32_t timeout)

int32_t hal_uart_finalize(uart_dev_t *uart)

相关结数据结构

uart_dev_t

typedef struct {
    uint8_t       port;   /* uart port */
    uart_config_t config; /* uart config */
    void         *priv;   /* priv data */
} uart_dev_t;

uart_config_t

typedef struct {
    uint32_t                baud_rate;
    hal_uart_data_width_t   data_width;
    hal_uart_parity_t       parity;
    hal_uart_stop_bits_t    stop_bits;
    hal_uart_flow_control_t flow_control;
    hal_uart_mode_t         mode;
} uart_config_t;

hal_uart_data_width_t

typedef enum {
    DATA_WIDTH_5BIT,
    DATA_WIDTH_6BIT,
    DATA_WIDTH_7BIT,
    DATA_WIDTH_8BIT,
    DATA_WIDTH_9BIT
} hal_uart_data_width_t;

hal_uart_parity_t

typedef enum {
    NO_PARITY,
    ODD_PARITY,
    EVEN_PARITY
} hal_uart_parity_t;

hal_uart_stop_bits_t

typedef enum {
    STOP_BITS_1,
    STOP_BITS_2
} hal_uart_stop_bits_t;

hal_uart_flow_control_t

typedef enum {
    FLOW_CONTROL_DISABLED,
    FLOW_CONTROL_CTS,
    FLOW_CONTROL_RTS,
    FLOW_CONTROL_CTS_RTS
} hal_uart_flow_control_t;

hal_uart_mode_t

typedef enum {
    MODE_TX,
    MODE_RX,
    MODE_TX_RX
} hal_uart_mode_t;

使用示例

#include <aos/hal/uart.h>

#define UART1_PORT_NUM  1
#define UART_BUF_SIZE   10
#define UART_TX_TIMEOUT 10
#define UART_RX_TIMEOUT 10

/* define dev */
uart_dev_t uart1;

/* data buffer */
char uart_data_buf[UART_BUF_SIZE];

int application_start(int argc, char *argv[])
{
    int count   = 0;
    int ret     = -1;
    int i       = 0;
    int rx_size = 0;

    /* uart port set */
    uart1.port = UART1_PORT_NUM;

    /* uart attr config */
    uart1.config.baud_rate    = 115200;
    uart1.config.data_width   = DATA_WIDTH_8BIT;
    uart1.config.parity       = NO_PARITY;
    uart1.config.stop_bits    = STOP_BITS_1;
    uart1.config.flow_control = FLOW_CONTROL_DISABLED;
    uart1.config.mode         = MODE_TX_RX;

    /* init uart1 with the given settings */
    ret = hal_uart_init(&uart1);
    if (ret != 0) {
        printf("uart1 init error !\n");
    }

    /* init the tx buffer */
    for (i = 0; i < UART_BUF_SIZE; i++) {
        uart_data_buf[i] = i + 1;
    }

    /* send 0,1,2,3,4,5,6,7,8,9 by uart1 */
    ret = hal_uart_send(&uart1, uart_data_buf, UART_BUF_SIZE, UART_TX_TIMEOUT);
    if (ret == 0) {
        printf("uart1 data send succeed !\n");
    }

    /* scan uart1 every 100ms, if data received send it back */
    while(1) {
        ret = hal_uart_recv_II(&uart1, uart_data_buf, UART_BUF_SIZE,
                               &rx_size, UART_RX_TIMEOUT);
        if ((ret == 0) && (rx_size == UART_BUF_SIZE)) {
            printf("uart1 data received succeed !\n");

            ret = hal_uart_send(&uart1, uart_data_buf, rx_size, UART_TX_TIMEOUT);
            if (ret == 0) {
                printf("uart1 data send succeed !\n");
            }
        }

        /* sleep 100ms */
        aos_msleep(100);
    };
}

注：port为逻辑端口号，其与物理端口号的对应关系见具体的对接实现

移植说明

   新建hal_uart_xxmcu.c和hal_uart_xxmcu.h的文件，并将这两个文件放到platform/mcu/xxmcu/hal目录下。在hal_uart_xxmcu.c中实现所需要的hal函数，hal_uart_xxmcu.h中放置相关宏定义。<br />       参考platform/mcu/stm32l4xx/src/STM32L496G-Discovery/hal/hal_uart_stm32l4.c