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#include "gd32f30x.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
#define I2C0_SLAVE_ADDRESS7 0x82
#define I2C1_SLAVE_ADDRESS7 0x72
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)
{
uint8_t i;
/* initialize led */
gd_eval_led_init(LED2);
gd_eval_led_init(LED3);
/* configure RCU */
rcu_config();
/* configure GPIO */
gpio_config();
/* configure I2C */
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_RECEIVER);
/* wait until ADDSEND bit is set */
while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));
/* clear ADDSEND bit */
i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
/* wait until ADDSEND bit is set */
while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
/* clear ADDSEND bit */
i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);
for(i = 0; i < 15; 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);
}
/* send a NACK for the last data byte */
i2c_ack_config(I2C0, I2C_ACK_DISABLE);
/* 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));
/* the master doesn't acknowledge for the last byte */
while(!i2c_flag_get(I2C1, I2C_FLAG_AERR));
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C0);
while(I2C_CTL0(I2C0) & 0x0200);
i2c_receiver[i] = i2c_data_receive(I2C0);
i2c_ack_config(I2C0, I2C_ACK_ENABLE);
/* clear the bit of AE */
i2c_flag_clear(I2C1, I2C_FLAG_AERR);
/* compare the transmit buffer and the receive buffer */
state = memory_compare(i2c_transmitter, i2c_receiver, 16);
/* if success, LED2 and LED3 are on */
if(SUCCESS == state) {
gd_eval_led_on(LED2);
gd_eval_led_on(LED3);
} else {
/* if failed, LED2 and LED3 are off */
gd_eval_led_off(LED2);
gd_eval_led_off(LED3);
}
while(1) {
}
}
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);
}
void gpio_config(void)
{
/* connect PB6 to I2C0_SCL */
/* connect PB7 to I2C0_SDA */
/* connect PB10 to I2C1_SCL */
/* connect PB11 to I2C1_SDA */
gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_10 | GPIO_PIN_11);
}
void i2c_config(void)
{
/* I2C clock configure */
i2c_clock_config(I2C0, 1000000, I2C_DTCY_16_9);
/* I2C address configure */
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);
i2c_clock_config(I2C1, 1000000, I2C_DTCY_16_9);
/* I2C address configure */
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);
}
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