问题遇到的现象和发生背景
MCU: GD32E230G8
如图所示，两个I2C，却只有一个是正常的。
我用的代码呢，在GD32F310上成功过。
可是现在只有一个正常。难道我只能用一个I2C了吗？
****
其实这个代码也是从官方的一个例子该来的。
###### 用代码块功能插入代码，请勿粘贴截图。 不用代码块回答率下降 50%
###### 代码如下：
```c
#include "gd32e23x.h"
#include "systick.h"
#include "stdint.h"
#define I2C_10BIT_ADDRESS 0
#define I2C0_OWN_ADDRESS7 0x72
#define I2C0_SLAVE_ADDRESS7 0x53
#define I2C0_SLAVE_ADDRESS10 0x0322
#define I2C0_SPEED 100000
#define I2C1_SPEED 100000
#define TIMEOUT 50
void i2c_init(void);
void i2c_rcu_config(void);
void i2c_gpio_config(void);
void i2c_config(void);
unsigned char i2c1_buffer_read(uint8_t Slave_address, uint8_t reg_address, uint8_t* p_buffer, uint16_t number_of_byte);
unsigned char i2c1_buffer_write(uint8_t Slave_address, uint8_t write_address, uint8_t* p_buffer, uint8_t number_of_byte);
unsigned char i2c0_buffer_read(uint8_t Slave_address, uint8_t reg_address, uint8_t* p_buffer, uint16_t number_of_byte);
unsigned char i2c0_buffer_write(uint8_t Slave_address, uint8_t write_address, uint8_t* p_buffer, uint8_t number_of_byte);
unsigned char i2c_buffer_read(uint32_t I2Cx, uint8_t Slave_address, uint8_t reg_address, uint8_t* p_buffer, uint16_t number_of_byte);
unsigned char i2c_buffer_write(uint32_t I2Cx, uint8_t Slave_address, uint8_t write_address, uint8_t* p_buffer, uint8_t number_of_byte);
/*!
\brief main function
\param[in] none
\param[out] none
\retval none
*/
int main(void)
{
SystemInit();
i2c_init();
unsigned char data = 0;
unsigned char buf[2] = {0x40,0x08};
while(1)
{
i2c0_buffer_write(0x20, 0x00, buf, 2);
i2c0_buffer_read(0xA6, 0x00, &data, 1);
i2c1_buffer_read(0x90, 0x21, &data, 1);
i2c1_buffer_write(0x90, 0x21, buf, 2);
}
}
void i2c_init(void)
{
i2c_gpio_config();
i2c_rcu_config();
i2c_config();
}
void i2c_rcu_config(void)
{
rcu_periph_clock_enable(RCU_I2C1);
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_I2C0);
rcu_periph_clock_enable(RCU_GPIOB);
}
void i2c_gpio_config(void)
{
/* connect PB6 to I2C0_SCL */
gpio_af_set(GPIOA, GPIO_AF_4, GPIO_PIN_0);
/* connect PB7 to I2C0_SDA */
gpio_af_set(GPIOA, GPIO_AF_4, GPIO_PIN_1);
/* configure GPIO pins of I2Cx */
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_0);
gpio_output_options_set(GPIOA, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ,GPIO_PIN_0);
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_1);
gpio_output_options_set(GPIOA, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ,GPIO_PIN_1);
/* connect PB6 to I2C1_SCL */
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_6);
/* connect PB7 to I2C1_SDA */
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_7);
/* configure GPIO pins of I2C1 */
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);
}
void i2c_config(void)
{
i2c_deinit(I2C1);
i2c_clock_config(I2C1,I2C1_SPEED,I2C_DTCY_2);
/* configure I2C address */
i2c_mode_addr_config(I2C1,I2C_I2CMODE_ENABLE,I2C_ADDFORMAT_7BITS,0xA2);
i2c_smbus_type_config(I2C1,I2C_SMBUS_DEVICE);
/* enable I2C1 */
i2c_enable(I2C1);
/* enable acknowledge */
i2c_ack_config(I2C1,I2C_ACK_ENABLE);
i2c_flag_clear(I2C1,I2C_FLAG_I2CBSY);
i2c_deinit(I2C0);
i2c_clock_config(I2C0,I2C0_SPEED,I2C_DTCY_2);
/* configure I2C address */
i2c_mode_addr_config(I2C0,I2C_I2CMODE_ENABLE,I2C_ADDFORMAT_7BITS,0xA2);
i2c_smbus_type_config(I2C0,I2C_SMBUS_DEVICE);
/* enable I2C0 */
i2c_enable(I2C0);
/* enable acknowledge */
i2c_ack_config(I2C0,I2C_ACK_ENABLE);
i2c_flag_clear(I2C0,I2C_FLAG_I2CBSY);
}
unsigned char i2c1_buffer_read(uint8_t Slave_address, uint8_t reg_address, uint8_t* p_buffer, uint16_t number_of_byte)
{
_Bool ack;
ack = i2c_buffer_read(I2C1, Slave_address, reg_address, p_buffer, number_of_byte);
return ack;
}
unsigned char i2c1_buffer_write(uint8_t Slave_address, uint8_t write_address, uint8_t* p_buffer, uint8_t number_of_byte)
{
_Bool ack;
ack = i2c_buffer_write(I2C1, Slave_address, write_address, p_buffer, number_of_byte);
return ack;
}
unsigned char i2c0_buffer_read(uint8_t Slave_address, uint8_t reg_address, uint8_t* p_buffer, uint16_t number_of_byte)
{
_Bool ack;
ack = i2c_buffer_read(I2C0, Slave_address, reg_address, p_buffer, number_of_byte);
return ack;
}
unsigned char i2c0_buffer_write(uint8_t Slave_address, uint8_t write_address, uint8_t* p_buffer, uint8_t number_of_byte)
{
_Bool ack;
ack = i2c_buffer_write(I2C0, Slave_address, write_address, p_buffer, number_of_byte);
return ack;
}
unsigned char i2c_buffer_read(uint32_t I2Cx, uint8_t Slave_address, uint8_t reg_address, uint8_t* p_buffer, uint16_t number_of_byte)
{
uint16_t timingout = TIMEOUT;
/* wait until I2C bus is idle */
while(i2c_flag_get(I2Cx, I2C_FLAG_I2CBSY))
i2c_init();
if(2 == number_of_byte)
{
i2c_ackpos_config(I2Cx,I2C_ACKPOS_NEXT);
}
/* send a start condition to I2C bus */
i2c_start_on_bus(I2Cx);
/* wait until SBSEND bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_SBSEND));
/* send slave address to I2C bus */
i2c_master_addressing(I2Cx, Slave_address, I2C_TRANSMITTER);
/* wait until ADDSEND bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_ADDSEND))
{
timingout--;
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_AERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_AERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 0;
}
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_BERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_BERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 1;
}
}
/* clear the ADDSEND bit */
i2c_flag_clear(I2Cx, I2C_FLAG_ADDSEND);
/* wait until the transmit data buffer is empty */
while(SET != i2c_flag_get( I2Cx , I2C_FLAG_TBE));
/* enable I2Cx*/
i2c_enable(I2Cx);
/* send the EEPROM's internal address to write to */
i2c_data_transmit(I2Cx, reg_address);
/* wait until BTC bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_BTC));
/* send a start condition to I2C bus */
i2c_start_on_bus(I2Cx);
/* wait until SBSEND bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_SBSEND));
/* send slave address to I2C bus */
i2c_master_addressing(I2Cx, Slave_address, I2C_RECEIVER);
if(number_of_byte < 3)
{
/* disable acknowledge */
i2c_ack_config(I2Cx,I2C_ACK_DISABLE);
}
timingout = TIMEOUT;
/* wait until ADDSEND bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_ADDSEND))
if(2 == number_of_byte)
{
timingout--;
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_AERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_AERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 0;
}
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_BERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_BERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 0;
}
}
/* clear the ADDSEND bit */
i2c_flag_clear(I2Cx,I2C_FLAG_ADDSEND);
if(1 == number_of_byte)
{
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2Cx);
}
/* while there is data to be read */
while(number_of_byte){
if(3 == number_of_byte){
/* wait until BTC bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_BTC));
/* disable acknowledge */
i2c_ack_config(I2Cx,I2C_ACK_DISABLE);
}
if(2 == number_of_byte){
/* wait until BTC bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_BTC));
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2Cx);
}
/* wait until the RBNE bit is set and clear it */
if(i2c_flag_get(I2Cx, I2C_FLAG_RBNE)){
/* read a byte from the EEPROM */
*p_buffer = i2c_data_receive(I2Cx);
/* point to the next location where the byte read will be saved */
p_buffer++;
/* decrement the read bytes counter */
number_of_byte--;
}
}
// test
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_AERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_AERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 0;
}
// if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_BERR) | (timingout==0))
// {
// i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_BERR);
// i2c_init();
// i2c0_buffer_write(Slave_address, reg_address, p_buffer, number_of_byte);
// return 1;
// }
/* wait until the stop condition is finished */
while(I2C_CTL0(I2Cx)&0x0200);
/* enable acknowledge */
i2c_ack_config(I2Cx, I2C_ACK_ENABLE);
i2c_ackpos_config(I2Cx, I2C_ACKPOS_CURRENT);
return 1;
}
unsigned char i2c_buffer_write(uint32_t I2Cx, uint8_t Slave_address, uint8_t write_address, uint8_t* p_buffer, uint8_t number_of_byte)
{
uint16_t timingout = TIMEOUT;
/* wait until I2C bus is idle */
while(i2c_flag_get(I2Cx, I2C_FLAG_I2CBSY));
/* send a start condition to I2C bus */
i2c_start_on_bus(I2Cx);
/* wait until SBSEND bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_SBSEND));
/* send slave address to I2C bus */
i2c_master_addressing(I2Cx, Slave_address, I2C_TRANSMITTER);
/* wait until ADDSEND bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_ADDSEND))
{
timingout--;
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_AERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_AERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 0;
}
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_BERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_BERR);
i2c_init();
i2c0_buffer_write(Slave_address, write_address, p_buffer, number_of_byte);
return 1;
}
}
/* clear the ADDSEND bit */
i2c_flag_clear(I2Cx,I2C_FLAG_ADDSEND);
/* wait until the transmit data buffer is empty */
while( SET != i2c_flag_get(I2Cx, I2C_FLAG_TBE));
/* send the EEPROM's internal address to write to : only one byte address */
i2c_data_transmit(I2Cx, write_address);
/* wait until BTC bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_BTC));
/* while there is data to be written */
while(number_of_byte--){
i2c_data_transmit(I2Cx, *p_buffer);
/* point to the next byte to be written */
p_buffer++;
timingout = TIMEOUT;
/* wait until BTC bit is set */
while(!i2c_flag_get(I2Cx, I2C_FLAG_BTC))
{
timingout--;
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_AERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_AERR);
i2c_stop_on_bus(I2Cx);
i2c_init();
return 0;
}
if(i2c_interrupt_flag_get(I2Cx, I2C_INT_FLAG_BERR) | (timingout==0))
{
i2c_interrupt_flag_clear(I2Cx, I2C_INT_FLAG_BERR);
i2c_init();
i2c0_buffer_write(Slave_address, write_address, p_buffer, number_of_byte);
return 1;
}
}
}
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2Cx);
/* wait until the stop condition is finished */
while(I2C_CTL0(I2Cx)&0x0200);
return 1;
}
运行结果及详细报错内容
MSDA
[2C-SDA
MSCL
I2C-SOL
LSDA
2C-SDA
11
LSCL 一王
2C-SO
10
