STM8S103飞线外接芯片,I2C不能得到slaveAddress应答,通讯失败

只看该作者 · 2021-1-4 17:15

STM8S103的板子上，有一个默认自带的AT24C02芯片，I2C读写，程序可以正常工作。
但是当飞线接另一个芯片时，却不能正常通讯，总是死在等待slaveAddress的应答上，I2C通信失败。
请教一下，有人遇到类似问题，如何解决的？？

下面是代码：

void Delayms(unsigned int ms)
{
  unsigned int x , y;
  for(x = ms; x > 0; x--)          /*  Í¨¹ýÒ»¶¨ÖÜÆÚÑ»·½øÐÐÑÓÊ±*/
for(y = 3000 ; y > 0 ; y--);
}

void IIC_Init()
{

PB_DDR_bit.DDR4 = 1;
PB_DDR_bit.DDR5 = 1;
PB_ODR_bit.ODR4 = 1;
PB_ODR_bit.ODR5 = 1;
PB_CR2_bit.C24 = 1;
PB_CR2_bit.C25 = 1;

I2C_CR2_bit.SWRST = 1;          //I2C1->CR1 |= 1 << 15;
asm("nop");
asm("nop");
asm("nop");
asm("nop");
I2C_CR2_bit.SWRST = 0;

//I2C1->CR2 &= ~I2C_CR2_FREQ;                                              //
I2C_FREQR_bit.FREQ = 16;       //Freq = 36M

I2C_CCRH_bit.F_S = 1;
I2C_CCRH_bit.DUTY = 0;
I2C_CCRL = 40;                //200KHZ  I2CFreq = PCLK1 / CCR / DUTY[Î»]       = 16MHZ / 40 / 2 = 200KHZ

I2C_TRISER_bit.TRISE = 16 + 1;

// I2C1->CR1 &= ~I2C_CR1_SMBUS;
I2C_CR1_bit.ENGC = 1;
I2C_CR1_bit.PE = 1;

}

void IIC_Write(unsigned char subaddr , unsigned char Byte_addr , unsigned char *buffer , unsigned short num)
{
unsigned char i2csr1;

//while(I2C1->SR2 & I2C_SR2_BUSY);

I2C_CR2_bit.START = 1;
while(I2C_SR1_bit.SB == 0);
i2csr1 = I2C_SR1; //SR1.AF
I2C_DR = (subaddr);
while(I2C_SR1_bit.ADDR == 0);
i2csr1 = I2C_SR1;
i2csr1 = I2C_SR3;

I2C_DR = Byte_addr;

while(I2C_SR1_bit.BTF == 0);
i2csr1 = I2C_SR1;

while(num > 0)
{
         I2C_DR = *buffer;

         while(I2C_SR1_bit.BTF == 0);
         i2csr1 = I2C_SR1;
         buffer++;
         num--;
}
I2C_CR2_bit.STOP = 1;
}

void IIC_Read(unsigned char subaddr , unsigned char Byte_addr , unsigned char *buffer , unsigned short num)
{
  unsigned char i2csr1;

  I2C_CR2_bit.ACK = 1;

  I2C_CR2_bit.START = 1;
  while(I2C_SR1_bit.SB == 0);
  i2csr1 = I2C_SR1;
  I2C_DR = subaddr;
  while(I2C_SR1_bit.ADDR == 0);
  i2csr1 = I2C_SR1;
  i2csr1 = I2C_SR3;

  I2C_DR = Byte_addr;
  while(I2C_SR1_bit.BTF == 0);
  i2csr1 = I2C_SR1;


  I2C_CR2_bit.START = 1;//I2C1->CR1 |= I2C_CR1_START;
  while(I2C_SR1_bit.SB == 0);

  i2csr1 = I2C_SR1;//SR1.AF??
  I2C_DR = (char)(subaddr | 0x01);
  while(I2C_SR1_bit.ADDR == 0);
  i2csr1 = I2C_SR1;
  i2csr1 = I2C_SR3;

  while(num)
  {
if(num == 1)
{
      I2C_CR2_bit.ACK = 0;
      I2C_CR2_bit.STOP = 1;
}

while(I2C_SR1_bit.RXNE == 0);
i2csr1 = I2C_SR1;

*buffer = I2C_DR;
buffer++;
num--;
  }
}