ch32v20x-examples/EVT/EXAM/USART/USART_HalfDuplex/User/main.c

/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2024/01/06
 * 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
 *single wire half duplex mode, master/slave mode transceiver routine:
 *Master:USART2_Tx(PA2)
 *Slave:USART3_Tx(PB10)
 *
 *This example demonstrates UART2 and USART3 single-wire half-duplex mode data
 *transmission and reception.
 *
 *Hardware connection:PA2 -- PB10
 *Note: The pin should be GPIO_Mode_AF_OD in single-wire half-duplex mode.
 *      The pin needs to connected a pull_up resistor 
 */

#include "debug.h"

/* Global typedef */
typedef enum
{
    FAILED = 0,
    PASSED = !FAILED
} TestStatus;

/* Global define */
#define TxSize1    (size(TxBuffer1))
#define TxSize2    (size(TxBuffer2))
#define size(a)    (sizeof(a) / sizeof(*(a)))

/* Global Variable */
u8 TxBuffer1[] = "*Buffer1 Send from USART2 to USART3 using HalfDuplex Mode!"; /* Send by UART2 */
u8 TxBuffer2[] = "#Buffer2 Send from USART3 to USART2 using HalfDuplex Mode!"; /* Send by UART3 */
u8 RxBuffer1[TxSize1] = {0};                                                   /* USART2 Using */
u8 RxBuffer2[TxSize2] = {0};                                                   /* USART3 Using  */

u8 TxCnt1 = 0, RxCnt1 = 0;
u8 TxCnt2 = 0, RxCnt2 = 0;

TestStatus TransferStatus1 = FAILED;
TestStatus TransferStatus2 = FAILED;
/*********************************************************************
 * @fn      Buffercmp
 *
 * @brief   Compares two buffers
 *
 * @param   Buf1,Buf2 - buffers to be compared
 *          BufferLength - buffer's length
 *
 * @return  PASSED - Buf1 identical to Buf
 *          FAILED - Buf1 differs from Buf2
 */
TestStatus Buffercmp(uint8_t *Buf1, uint8_t *Buf2, uint16_t BufLength)
{
    while(BufLength--)
    {
        if(*Buf1 != *Buf2)
        {
            return FAILED;
        }
        Buf1++;
        Buf2++;
    }
    return PASSED;
}

/*********************************************************************
 * @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_APB1PeriphClockCmd(RCC_APB1Periph_USART2 | RCC_APB1Periph_USART3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    /* USART2 TX-->A.2 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; /* Only Configure TX Pin */
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* USART3 TX-->B.10 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; /* Only Configure TX Pin */
    GPIO_Init(GPIOB, &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(USART2, &USART_InitStructure);
    USART_Init(USART3, &USART_InitStructure);
    USART_Cmd(USART2, ENABLE);
    USART_Cmd(USART3, ENABLE);

    USART_HalfDuplexCmd(USART2, ENABLE);
    USART_HalfDuplexCmd(USART3, ENABLE);
}
/*********************************************************************
 * @fn      DMA_INIT
 *
 * @brief   Configures the DMA for USART2 & USART3.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n", SystemCoreClock);
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
    printf("USART HalfDuplex TEST\r\n");
    USARTx_CFG(); /* USART2 & USART3 INIT */

    while(TxCnt2 < TxSize2) /* USART3--->USART2 */
    {
        while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET) /* waiting for sending finish */
        {
        }
        USART_SendData(USART3, TxBuffer2[TxCnt2++]);

        while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET)
        {
        }
        RxBuffer1[RxCnt1++] = USART_ReceiveData(USART2);
    }

    while(TxCnt1 < TxSize1) /* USART2--->USART3 */
    {
        while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET) /* waiting for sending finish */
        {
        }
        USART_SendData(USART2, TxBuffer1[TxCnt1++]);

        while(USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET)
        {
        }
        RxBuffer2[RxCnt2++] = USART_ReceiveData(USART3);
    }

    TransferStatus1 = Buffercmp(TxBuffer1, RxBuffer2, TxSize1);
    TransferStatus2 = Buffercmp(TxBuffer2, RxBuffer1, TxSize2);

    if(TransferStatus1 && TransferStatus2)
    {
        printf("\r\nSend Success!\r\n");
    }
    else
    {
        printf("\r\nSend Fail!\r\n");
    }
    printf("TxBuffer1---->RxBuffer2     TxBuffer2---->RxBuffer1\r\n");
    printf("TxBuffer1:%s\r\n", TxBuffer1);
    printf("RxBuffer1:%s\r\n", RxBuffer1);
    printf("TxBuffer2:%s\r\n", TxBuffer2);
    printf("RxBuffer2:%s\r\n", RxBuffer2);

    while(1)
    {
    }
}