c - mcu UART，从传感器(rx 引脚)读取串行数据并在 PC 上显示(Tx 引脚)

Question

我正在 MCU 上使用 UART。下面是 MCU 通过串行电缆向 PC 打印“hello world”的示例代码。

#define BANNER ("Hello, world!\n\n")
int main(void)
{
ti_uart_write_buffer(TI_UART_0, (uint8_t *)BANNER,
                 sizeof(BANNER));
    return 0;
}

这是头文件中的ti_uart_write_buffer定义。

/**
 * Perform a write on the UART interface. This is a blocking
 * synchronous call. The function will block until all data has
 * been transferred.
 *
 * @brief UART multi-byte data write.
 * @param [in] uart UART index.
 * @param [in] data Data to write to UART.
 * @param [in] len Length of data to write to UART.
 * @return ti_rc_t ti_RC_OK on success, error code otherwise.
 */
ti_rc_t ti_uart_write_buffer(const ti_uart_t uart, const uint8_t *const data,
                 uint32_t len);

我正在使用带有串行接口(interface)的传感器。这是来自数据表。

Pin 5 Serial Output: The sensor has a TTL outputs. The output is an ASCII capital “R”, followed by four ASCII character digits representing the range in millimeters, followed by a carriage return (ASCII 13).

我正在尝试读取 Rx 引脚上的传感器数据并将其传输到 Tx 引脚上的 PC。

这是我收集的需要使用的头文件中的 uart 读取函数。

/**
 * Perform a single character read from the UART interface.
 * This is a blocking synchronous call.
 *
 * @brief UART character data read.
 * @param [in] uart UART index.
 * @param [out] data Data to read from UART.
 * @return qm_uart_status_t Returns UART specific return code.
 */
ti_uart_status_t ti_uart_read(const ti_uart_t uart, uint8_t *data);

我的问题是:

1. 我在 main() 中创建了一个循环，它不断读取序列并将新数据添加到数组中，直到到达结束标记。这有道理吗？
2. 鉴于上面的 hello world 示例，我如何打印出数组？

<小时/>

typedef uint8_t byte;
const byte numChars = 32;
char receivedChars[32]; 
bool newData = false;

void recvWithEndMarker();

int main(void)
{
        do{  
    recvWithEndMarker();
        }
        while (1);
    return 0;
}

void recvWithEndMarker()
{
     static byte ndx = 0;
     char endMarker = '\r';
     char rc;
     while (newData == false) {
        rc = ti_uart_read_non_block(QM_UART_0);  
        if (rc != endMarker) {
        receivedChars[ndx] = rc;
        ndx++;
            if (ndx >= numChars) {
                ndx = numChars - 1;
                        }
                }
            else {
                receivedChars[ndx] = '\0'; 
                ndx = 0;
                newData = true;
        }
    }
}

Answer 1

回答您的问题:

是的，从传感器读取的每条消息的数据都应该逐字节保存到数组中。

当从传感器收到完整的消息时，然后调用写入函数。