/*!
    \file    main.c
    \brief   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"

#define I2C_10BIT_ADDRESS    0
#define I2C1_OWN_ADDRESS7    0x82
#define I2C1_OWN_ADDRESS10   0x0322

uint8_t i2c_transmitter[16];

void rcu_config(void);
void i2c1_gpio_config(void);
void i2c_config(void);

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    int i;
    
    /* enable the peripheral clock */
    rcu_config();
    /* configure the I2C1 GPIO ports */
    i2c1_gpio_config();
    /* configure I2C1 */
    i2c_config();

    for(i=0; i<16; i++){
        i2c_transmitter[i] = i + 0x80;
    }
    
    /* wait until ADDSEND bit is set */
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    /* clear ADDSEND bit */
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
#if I2C_10BIT_ADDRESS
    /* wait until ADDSEND bit is set */
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
#endif
    I2C_STAT(I2C1) |= I2C_STAT_TBE;
    /* wait until the transmission data register is empty */
    while(!i2c_flag_get(I2C1, I2C_FLAG_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_TI));
    }
    /* wait until stop condition generate */
    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));
    /* clear the STPDET bit */
    i2c_flag_clear(I2C1, I2C_FLAG_STPDET);

    while(1){
    }
}

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

/*!
    \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 I2C1 interface
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c_config(void)
{
#if I2C_10BIT_ADDRESS
    /* enable 10-bit addressing mode in master mode */
    i2c_address10_enable(I2C1);
    /* configure I2C address */
    i2c_address_config(I2C1, I2C1_OWN_ADDRESS10, I2C_ADDFORMAT_10BITS);
#else
    /* configure I2C address */
    i2c_address_config(I2C1, I2C1_OWN_ADDRESS7, I2C_ADDFORMAT_7BITS);
#endif
    /* enable I2C1 */
    i2c_enable(I2C1);
}