ch32v20x-examples/EVT/EXAM/SPI/SPI_CRC/User/main.c

/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2021/06/06
 * 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
 *CRC error check and master/slave mode transceiver routine:
 *Master:SPI1_SCK(PA5)\SPI1_MOSI(PA7).
 *Slave:SPI1_SCK(PA5)\SPI1_MISO(PA6).
 *
 *This example demonstrates the use of CRC error checking, the Master sends and
 *the Slave receives.
 *Note: The two boards download the Master and Slave programs respectively, and
 *power on at the same time.
 *    Hardware connection:PA5--PA5
 *                        PA7--PA6
 *
 */

#include "debug.h"

/* SPI Mode Definition */
#define HOST_MODE     0
#define SLAVE_MODE    1

/* SPI Communication Mode Selection */
//#define SPI_MODE      HOST_MODE
#define SPI_MODE   SLAVE_MODE

/* Global define */
#define Size          4

/* Global Variable */
u8 TxData[Size] = {0x01, 0x02, 0x03, 0x04};
u8 RxData[Size];

/*********************************************************************
 * @fn      SPI_1Lines_HalfDuplex_Init
 *
 * @brief   Configuring the SPI for half-duplex communication.
 *
 * @return  none
 */
void SPI_1Lines_HalfDuplex_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    SPI_InitTypeDef  SPI_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);

#if(SPI_MODE == HOST_MODE)
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

#elif(SPI_MODE == SLAVE_MODE)
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
#endif

#if(SPI_MODE == HOST_MODE)
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

#elif(SPI_MODE == SLAVE_MODE)
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

#endif

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_CalculateCRC(SPI1, ENABLE);
    SPI_Cmd(SPI1, ENABLE);
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    u8 i = 0, crcval;

    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() );

#if(SPI_MODE == SLAVE_MODE)
    printf("SLAVE Mode\r\n");
    Delay_Ms(1000);

#endif
    SPI_1Lines_HalfDuplex_Init();

#if(SPI_MODE == HOST_MODE)
    printf("HOST Mode\r\n");
    Delay_Ms(2000);

#endif

    while(1)
    {
#if(SPI_MODE == HOST_MODE)
        while(i < 3)
        {
            if(i < 2)
            {
                if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) != RESET)
                {
                    SPI_I2S_SendData(SPI1, TxData[i]);
                    i++;
                }
            }
            else
            {
                if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) != RESET)
                {
                    SPI_I2S_SendData(SPI1, TxData[i]);
                    SPI_TransmitCRC(SPI1);
                    i++;
                }
            }
        }

        while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) != RESET)
        {
            if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == RESET)
            {
                SPI_Cmd(SPI1, DISABLE);
                crcval = SPI_GetCRC(SPI1, SPI_CRC_Tx);
                printf("CRC:%02x\r\n", crcval);
                while(1)
                    ;
            }
        }

#elif(SPI_MODE == SLAVE_MODE)
        while(i < 4)
        {
            if(i < 2)
            {
                if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) != RESET)
                {
                    RxData[i] = SPI_I2S_ReceiveData(SPI1);
                    i++;
                }
            }
            else if(i == 2)
            {
                SPI_TransmitCRC(SPI1);
                if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) != RESET)
                {
                    RxData[i] = SPI_I2S_ReceiveData(SPI1);
                    i++;
                }
            }
            else
            {
                if(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) != RESET)
                {
                    RxData[i] = SPI_I2S_ReceiveData(SPI1);
                    i++;
                }
            }
        }

        crcval = SPI_GetCRC(SPI1, SPI_CRC_Rx);
        printf("CRC:%02x\r\n", crcval);

        for(i = 0; i < 4; i++)
        {
            printf("Rxdata:%02x\r\n", RxData[i]);
        }

        while(1);

#endif
    }
}