正在使用stm8作为从机与esp32进行i2c通讯，但是发现主机扫描的i2c地址与stm8从机设置的i2c地址不一样，请问如何解决？

Troy-_Wong 提问时间：2024-10-24 10:51 / 未解决

问答
是否解决:	未解决

这个是stm8从机代码

===



#include <Arduino.h>
// #include <stm8s.h> // 假设你使用了STM8标准库
// #include "i2c_slave.h"
#include "Wire.h"
#define I2C_SLAVE_ADDR 0x30

#define I2C_DATA_SIZE 8

#if ((I2C_DATA_SIZE > 0) && ((I2C_DATA_SIZE & (I2C_DATA_SIZE - 1)) != 0))
#error I2C_DATA_SIZE isnt a power of 2.
#endif

#define uint8_bits_def(x)         \
  union                           \
  {                               \
    unsigned char x;              \
    struct                        \
    {                             \
      unsigned char x##_Bit0 : 1, \
          x##_Bit1 : 1,           \
          x##_Bit2 : 1,           \
          x##_Bit3 : 1,           \
          x##_Bit4 : 1,           \
          x##_Bit5 : 1,           \
          x##_Bit6 : 1,           \
          x##_Bit7 : 1;           \
    };                            \
  }

uint8_bits_def(tagI2C);
uint8_t i2c_addr = 0;
uint8_t i2c_data[I2C_DATA_SIZE] = {0x00};
int tagI2C_Bit0 = 0;

// // I2C中断服务处理函数声明
// void I2C_ISR(void) __interrupt(19); // I2C中断向量号

void Serial_print(const char *str)
{
  while (*str)
  {
    Serial_write(*str++); // 逐个字符发送
  }
}

void I2C_Slave_IRQHandler(void)
{
  volatile I2C_Event_TypeDef Event = I2C_GetLastEvent();
  Serial_print("STM8 I2C_Slave_IRQHandler.");
  /* Slave address matched with the address sent by master */
  /* EV1: ADDR = 1, 顺序读SR1,SR3寄存器清除此标志位 */
  if (Event == (I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED))
  {
    tagI2C_Bit0 = 1;
  }
  /* Slave received the data byte from master */
  /* EV2: RxNE = 1, 读DR寄存器清除此位 */
  else if (Event == (I2C_EVENT_SLAVE_BYTE_RECEIVED))
  {
    uint8_t ch = I2C_ReceiveData();
    if (tagI2C_Bit0)
    {
      tagI2C_Bit0 = 0;
      i2c_addr = ch;
    }
    else
    {
      i2c_data[i2c_addr++ & (I2C_DATA_SIZE - 1)] = ch;
    }
  }
  /* Slave received STOP byte from master */
  /* EV4: STOPF = 1，读SR1寄存器后再写CR2清除 */
  else if (Event == (I2C_EVENT_SLAVE_STOP_DETECTED))
  {
    I2C_GetFlagStatus(I2C_FLAG_STOPDETECTION);
    I2C_GenerateSTOP(DISABLE);
  }
  /* SLAVE TRANSMITTER */
  /* Data transmited from slave to master */
  /* EV3: TxE = 1, 写DR寄存器清除DR */
  else if ((Event == (I2C_EVENT_SLAVE_BYTE_TRANSMITTED)) ||
           (Event == (I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED)))
  {
    uint8_t ch = i2c_data[i2c_addr++ & (I2C_DATA_SIZE - 1)];
    I2C_SendData(ch);
  }
  /* Acknowledge failure */
  /* EV3-2: AF = 1, AF is cleared by writing '0' in AF bit of SR2 register */
  else if (Event == (I2C_EVENT_SLAVE_ACK_FAILURE))
  {
    I2C_ClearFlag(I2C_FLAG_ACKNOWLEDGEFAILURE);
  }
}

// INTERRUPT_HANDLER(I2C_IRQHandler, 19)
// {
//   I2C_Slave_IRQHandler();
// }

void I2C_Slave_Init(void)
{
  // open I2C clk
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, ENABLE);
  I2C_DeInit();
  I2C_Init(50000, I2C_SLAVE_ADDR, I2C_DUTYCYCLE_2, I2C_ACK_CURR, I2C_ADDMODE_7BIT, (CLK_GetClockFreq() / 1000000));
  /* Enable Error Interrupt*/
  I2C_ITConfig((I2C_IT_TypeDef)(I2C_IT_ERR | I2C_IT_EVT | I2C_IT_BUF), ENABLE);
  /* enable IIC*/
  I2C_Cmd(ENABLE);
  // enableInterrupts();
}
void setup()
{
  // 初始化串口通信，波特率为9600
  Serial_begin(9600);

  // 给串口输出一条消息，表示系统已经启动
  Serial_print("STM8 initialized and ready.");

  I2C_Slave_Init();

  // pid_i2c_init();
}

void loop()
{
}

这个是esp32主机代码

===

#include <Arduino.h>
#include "Wire.h"
uint32_t I2C2_SPEED = 50000;
void setup()
{
  Serial.begin(115200);
  Wire.begin(21, 22, I2C2_SPEED);
}

void loop()
{
  byte error, address;
  int nDevices = 0;

  delay(3000);

  Serial.println("Scanning for I2C devices ...");
  for (address = 0x01; address < 0x7f; address++)
  {
    Wire.beginTransmission(address);
    // Wire.write(0x11);
    error = Wire.endTransmission();
    if (error == 0)
    {
      Serial.printf("I2C device found at address 0x%02X\n", address);
      nDevices++;
    }
    else if (error != 2)
    {

      Serial.printf("Error %d at address 0x%02X\n", error, address);
    }
  }
  if (nDevices == 0)
  {
    Serial.println("No I2C devices found");
  }
}

esp32 debug:
Scanning for I2C devices ...
I2C device found at address 0x18
Scanning for I2C devices ...
I2C device found at address 0x18
Scanning for I2C devices ...
I2C device found at address 0x18

当esp32扫描到这个i2c地址后stm8会重启，当前不知道是什么原因导致的