uart_polling
---

This is an example of UART polling

+ Select the UART TX/RX pins

    ```
    // in main.c
    #define CONFIG_UART_IO_TX_PORT		GPIOA
    #define CONFIG_UART_IO_TX_PIN		GPIO_Pin_01
    #define CONFIG_UART_IO_TX_AF_MODE	GPIO_AF_1
    #define CONFIG_UART_IO_RX_PORT		GPIOA
    #define CONFIG_UART_IO_RX_PIN		GPIO_Pin_00
    #define CONFIG_UART_IO_RX_AF_MODE	GPIO_AF_1
    ```

+ Configure the parameters related to UART
+ It can be modified according to the requirements

    ```
    // in main.c
    #define CONFIG_BAUD_RATE_VALUE  38400
    UART_WordLength_8b	//Data bit 8
    UART_StopBits_1		//Stop bit 1
    UART_Parity_No		//No check bit
    UART_Mode_TxRx	//Transmit-Receive Mode
    ```


## Log

Use serial port with baudrate 38400, 8bit, no parity check

+ PC sends 1~255 to PEC930
+ PEC930 receives and sends back data