GD32F3x0_Firmware_Library/Examples/I2C/Master_transmitter&slave_receiver/main.c

/*!
    \file  main.c
    \brief master transmitter slave receiver
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

#include "gd32f3x0.h"
#include <stdio.h>
#include "gd32f3x0_eval.h"

#define I2C0_SLAVE_ADDRESS7    0x82
#define I2C1_SLAVE_ADDRESS7    0x72

uint8_t i2c_transmitter[16];
uint8_t i2c_receiver[16];
ErrStatus state = ERROR;

void rcu_config(void);
void gpio_config(void);
void i2c_config(void);
ErrStatus memory_compare(uint8_t* src, uint8_t* dst, uint16_t length);

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    int i;
    gd_eval_led_init(LED1);
    gd_eval_led_init(LED2);
    rcu_config();
    gpio_config();
    i2c_config();

    for(i=0;i<16;i++){
        i2c_transmitter[i]=i+0x80;
    }

    /* wait until I2C bus is idle */
    while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));

    /* send a start condition to I2C bus */
    i2c_start_on_bus(I2C0);

    /* wait until SBSEND bit is set */
    while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));

    /* send slave address to I2C bus*/
    i2c_master_addressing(I2C0, I2C1_SLAVE_ADDRESS7, I2C_TRANSMITTER);

    /* wait until ADDSEND bit is set*/
    while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    /* clear ADDSEND bit */
    i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    for(i=0;i<16;i++){
        /* send a data byte */
        i2c_data_transmit(I2C0,i2c_transmitter[i]);
        /* wait until the transmission data register is empty*/
        while(!i2c_flag_get(I2C0, I2C_FLAG_TBE));
        /* wait until the RBNE bit is set */
        while(!i2c_flag_get(I2C1, I2C_FLAG_RBNE));
        /* read a data from I2C_DATA */
        i2c_receiver[i] = i2c_data_receive(I2C1);
    }
    /* send a stop condition to I2C bus*/
    i2c_stop_on_bus(I2C0);
    while(I2C_CTL0(I2C0)&0x0200);
    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));
    /* clear the STPDET bit */
    i2c_enable(I2C0);
    state = memory_compare(i2c_transmitter, i2c_receiver,16);
    if(SUCCESS == state){
        gd_eval_led_on(LED1);
        gd_eval_led_on(LED2);
    }else{
        gd_eval_led_off(LED1);
        gd_eval_led_off(LED2); 
    }
    while(1);
}

/*!
    \brief      memory compare function
    \param[in]  src : source data
    \param[in]  dst : destination data
    \param[in]  length : the compare data length
    \param[out] none
    \retval     ErrStatus : ERROR or SUCCESS
*/
ErrStatus memory_compare(uint8_t* src, uint8_t* dst, uint16_t length) 
{
    while(length--){
        if(*src++ != *dst++){
            return ERROR;
        }
    }
    return SUCCESS;
}

/*!
    \brief      enable the peripheral clock
    \param[in]  none
    \param[out] none
    \retval     none
*/
void rcu_config(void)
{
    /* enable GPIOB clock */
    rcu_periph_clock_enable(RCU_GPIOB);
    /* enable I2C1 clock */
    rcu_periph_clock_enable(RCU_I2C1);
    /* enable I2C0 clock */
    rcu_periph_clock_enable(RCU_I2C0);
}

/*!
    \brief      cofigure the GPIO ports.
    \param[in]  none
    \param[out] none
    \retval     none
*/
void gpio_config(void)
{
    /* connect PB6 to I2C0_SCL */
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_6);
    /* connect PB7 to I2C0_SDA */
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_7);
    /* connect PB10 to I2C1_SCL */
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_10);
    /* connect PB11 to I2C1_SDA */
    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_11);
    /* configure GPIO pins of I2C0 */
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_6);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ,GPIO_PIN_6);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_7);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ,GPIO_PIN_7);
    /* configure GPIO pins of I2C1 */
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_10);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ,GPIO_PIN_10);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_11);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ,GPIO_PIN_11);
}

/*!
    \brief      cofigure the I2C0 and I2C1 interfaces
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c_config(void)
{
    /* configure I2C0 clock */
    i2c_clock_config(I2C0, 100000, I2C_DTCY_2);
    /* configure I2C0 address */
    i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C0_SLAVE_ADDRESS7);
    /* enable I2C0 */
    i2c_enable(I2C0);
    /* enable acknowledge */
    i2c_ack_config(I2C0, I2C_ACK_ENABLE);
    /* configure I2C1 clock */
    i2c_clock_config(I2C1, 100000, I2C_DTCY_2);
    /* configure I2C1 address */
    i2c_mode_addr_config(I2C1, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C1_SLAVE_ADDRESS7);
    /* enable I2C1 */
    i2c_enable(I2C1);
    /* enable acknowledge */
    i2c_ack_config(I2C1, I2C_ACK_ENABLE);
}