CH32V003 UART example

It's a UART example run on Muse Lab nanoCH32V003. Actually, it is the default Hello World generated by MounStudio Studio. It demonstrates that USART1 receives the data sent by CH341 and inverts it and sends it (baud rate 115200).

This video also show the Muse Lab WCH-LinkE act as USB to TTL serial adapter to communicate with CH32V003 via UART using RuTTY.


Connection

The modified main.c is listed here for reference.

/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2022/08/08
 * Description        : Main program body.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for 
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/

/*
 *@Note
 Multiprocessor communication mode routine:
 Master:USART1_Tx(PD5)\USART1_Rx(PD6).
 This routine demonstrates that USART1 receives the data sent by CH341 and inverts
 it and sends it (baud rate 115200).

 Hardware connection:PD5 -- Rx
                     PD6 -- Tx

*/

#include "debug.h"


/* Global define */


/* Global Variable */
vu8 val;

/*********************************************************************
 * @fn      USARTx_CFG
 *
 * @brief   Initializes the USART2 & USART3 peripheral.
 *
 * @return  none
 */
void USARTx_CFG(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure = {0};
    USART_InitTypeDef USART_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1, ENABLE);

    /* USART1 TX-->D.5   RX-->D.6 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    Delay_Init();
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n",SystemCoreClock);

    USARTx_CFG();

    while(1)
    {

        while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET)
        {
            /* waiting for receiving finish */
        }
        val = (USART_ReceiveData(USART1));
        //USART_SendData(USART1, ~val);
        USART_SendData(USART1, val);
        while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
        {
            /* waiting for sending finish */
        }
    }
}