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

    \version 2021-10-30, V1.0.0, firmware for gd32w51x
*/

/*
    Copyright (c) 2021, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

#include "gd32w51x.h"
#include <stdio.h>
#include "gd32w515p_eval.h"

#define I2C0_SLAVE_ADDRESS7   0x82
#define I2C1_SLAVE_ADDRESS7   0x72

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

void rcu_config(void);
void gpio_config(void);
void i2c0_gpio_config(void);
void i2c1_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;
    
    /* initialize LED1, LED3, as the transfer instruction */
    gd_eval_led_init(LED1);
    gd_eval_led_init(LED3);
    /* enable the peripheral clock */
    rcu_config();
    /* configure the I2C0 and I2C1 GPIO ports */
    i2c0_gpio_config();
    i2c1_gpio_config();
    /* configure I2C0 and I2C1 */
    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 ADDSEND bit is set */
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    /* clear ADDSEND bit */
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
    
    /* clear data in I2C_TDATA register */
    I2C_STAT(I2C1) |= I2C_STAT_TBE;
    for(i=0; i<16; i++){
        /* send a data byte */
        i2c_data_transmit(I2C1, i2c_transmitter[i]);
        /* wait until the transmission data register is empty */
        while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));
        /* wait until the RBNE bit is set */
        while(!i2c_flag_get(I2C0, I2C_FLAG_RBNE));
        /* read a data from I2C_DATA */
        i2c_receiver[i] = i2c_data_receive(I2C0);
    }

    /* wait for the STOP condition */
    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));
    i2c_flag_clear(I2C1, I2C_FLAG_STPDET);
    
    while(!i2c_flag_get(I2C0, I2C_FLAG_STPDET));
    i2c_flag_clear(I2C0, I2C_FLAG_STPDET);
    /* compare the transmit buffer and the receive buffer */
    state = memory_compare(i2c_transmitter, i2c_receiver, 16);
    /* if success, LED1 and LED3 are on */
    if(SUCCESS == state){
        gd_eval_led_on(LED1);
        gd_eval_led_on(LED3);
    }else{
        /* if failed, LED1 and LED3 are off */
        gd_eval_led_off(LED1);
        gd_eval_led_off(LED3);
    }
    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 GPIOC clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* enable I2C0 clock */
    rcu_periph_clock_enable(RCU_I2C0);
    /* enable I2C1 clock */
    rcu_periph_clock_enable(RCU_I2C1);
}

/*!
    \brief      configure the I2C0 GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c0_gpio_config(void)
{
    /* connect PA15 to I2C0_SCL */
    gpio_af_set(GPIOA, GPIO_AF_4, GPIO_PIN_15);
    /* connect PB7 to I2C0_SDA */
    gpio_af_set(GPIOB, GPIO_AF_4, GPIO_PIN_7);
    /* configure GPIO pins of I2C0 */
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_15);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, GPIO_PIN_15);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_7);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, GPIO_PIN_7);
}

/*!
    \brief      configure the I2C1 GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c1_gpio_config(void)
{
    /* connect PA8 to I2C1_SDA */
    gpio_af_set(GPIOA, GPIO_AF_6, GPIO_PIN_8);
    /* connect PB15 to I2C1_SCL */
    gpio_af_set(GPIOB, GPIO_AF_6, GPIO_PIN_15);
    /* configure GPIO pins of I2C1 */
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_8);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, GPIO_PIN_8);
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_15);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_25MHZ, GPIO_PIN_15);
}

/*!
    \brief      configure the I2C0 and I2C1 interfaces
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c_config(void)
{
    /* configure I2C timing */
    i2c_timing_config(I2C0, 0x1, 0x5, 0);
    i2c_master_clock_config(I2C0, 0x59, 0x81);
    /* configure slave address */
    i2c_master_addressing(I2C0, I2C1_SLAVE_ADDRESS7, I2C_MASTER_RECEIVE);
    /* configure I2C address */
    i2c_address_config(I2C0, I2C0_SLAVE_ADDRESS7, I2C_ADDFORMAT_7BITS);
    /* configure number of bytes to be transferred */
    i2c_transfer_byte_number_config(I2C0, 16);
    /* enable I2C automatic end mode in master mode */
    i2c_automatic_end_enable(I2C0);
    /* enable I2C0 */
    i2c_enable(I2C0);
    
    /* configure I2C address */
    i2c_address_config(I2C1, I2C1_SLAVE_ADDRESS7, I2C_ADDFORMAT_7BITS);
    /* enable I2C1 */
    i2c_enable(I2C1);
}