ch32v20x-examples/EVT/EXAM/I2C/I2C_PEC/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
 *PEC error check, master/slave mode transceiver routine:
 *I2C1_SCL(PB8)\I2C1_SDA(PB9).
 *This example demonstrates that the Master sends with PEC error checking, and the
 *Slave receives. If a transmission error occurs, an error interrupt is triggered.
 *Note: The two boards download the Master and Slave programs respectively,
 *and power on at the same time.
 *    Hardware connection:PB8 -- PB8
 *                        PB9 -- PB9
 *
 */

#include "debug.h"

/* I2C Mode Definition */
#define HOST_MODE     0
#define SLAVE_MODE    1

/* I2C Communication Mode Selection */
//#define I2C_MODE   HOST_MODE
#define I2C_MODE      SLAVE_MODE

/* Global define */
#define Size          7
#define RXAdderss     0x02
#define TxAdderss     0x02

/* Global Variable */
u8 TxData[Size] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06};
u8 RxData[Size];

/*********************************************************************
 * @fn      IIC_Init
 *
 * @brief   Initializes the IIC peripheral.
 *
 * @return  none
 */
void IIC_Init(u32 bound, u16 address)
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    I2C_InitTypeDef  I2C_InitTSturcture = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    I2C_InitTSturcture.I2C_ClockSpeed = bound;
    I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
    I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_16_9;
    I2C_InitTSturcture.I2C_OwnAddress1 = address;
    I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
    I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_Init(I2C1, &I2C_InitTSturcture);

#if(I2C_MODE == SLAVE_MODE)
    NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    I2C_ITConfig(I2C1, I2C_IT_ERR, ENABLE);

#endif

    I2C_Cmd(I2C1, ENABLE);
    I2C_CalculatePEC(I2C1, ENABLE);
}

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

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init(460800);
    printf("SystemClk:%d\r\n", SystemCoreClock);
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

#if(I2C_MODE == HOST_MODE)
    printf("IIC Host mode\r\n");
    IIC_Init(80000, TxAdderss);

    while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET);
    I2C_GenerateSTART(I2C1, ENABLE);

    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
    I2C_Send7bitAddress(I2C1, 0x02, I2C_Direction_Transmitter);

    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    while(i < 7)
    {
        if(i < 6)
        {
            if(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXE) != RESET)
            {
                I2C_SendData(I2C1, TxData[i]);
                i++;
            }
        }

        if(i == 6)
        {
            if(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXE) != RESET)
            {
                I2C_TransmitPEC(I2C1, ENABLE);
                i++;
            }
        }
    }

    while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    I2C_GenerateSTOP(I2C1, ENABLE);

#elif(I2C_MODE == SLAVE_MODE)
    printf("IIC Slave mode\r\n");
    IIC_Init(80000, RXAdderss);

    while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED));

    while(i < 7)
    {
        if(i < 5)
        {
            if(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) != RESET)
            {
                RxData[i] = I2C_ReceiveData(I2C1);
                i++;
            }
        }

        if(i == 5)
        {
            pecValue = I2C_GetPEC(I2C1);
            if(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) != RESET)
            {
                RxData[i] = I2C_ReceiveData(I2C1);
                i++;
            }
        }

        if(i == 6)
        {
            I2C_TransmitPEC(I2C1, ENABLE);
            if(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) != RESET)
            {
                RxData[i] = I2C_ReceiveData(I2C1);
                i++;
            }
        }
    }

    printf("pecValue:%02x\r\n", pecValue);
    printf("RxData:\r\n");

    for(i = 0; i < 7; i++)
    {
        printf("%02x\r\n", RxData[i]);
    }

#endif

    while(1);
}