STM8 硬件I2C没反应

只看该作者 · 2010-5-4 11:53

在做完模拟的I2C后，现在改用硬件的I2C，一点反应都没有，在仿真的情况下用示波器检测，就连Start信号也看不到，仿真软件中看到寄存器的值又是正确的，同志们帮忙分析下原因，下面是代码，用的是ST的DEMO和库函数

#define I2C_Speed             35000

void I2cInit(void)
{
/* Optional: put here as example only */
I2C_DeInit();
/* I2C Peripheral Enable */
I2C_Cmd(ENABLE);
/* Apply I2C configuration after enabling it */
I2C_Init(I2C_Speed, 0x88, I2C_DUTYCYCLE_2, I2C_ACK_CURR, I2C_ADDMODE_7BIT, 8);
}

void I2C_EE_BufferRead(u8* pBuffer, u16 ReadAddr, u8 NumByteToRead)
{
/* While the bus is busy */
  while(I2C_GetFlagStatus(I2C_FLAG_BUSBUSY));

  /* Generate start & wait event detection */
I2C_GenerateSTART(ENABLE);
  /* Test on EV5 and clear it */
  while (!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT));

  /* Send slave Address in write direction & wait detection event */
I2C_Send7bitAddress(CP_Add, I2C_DIRECTION_TX);
/* Test on EV6 and clear it */
while (!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));
I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);

/* Send Address of first byte to be read & wait event detection */
//I2C_SendData((u8)(ReadAddr >> 8)); /* MSB */
/* Test on EV8 and clear it */
//while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_SendData((u8)(ReadAddr)); /* LSB */
  /* Test on EV8 and clear it */
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send STRAT condition a second time */
  I2C_GenerateSTART(ENABLE);
/* Test on EV5 and clear it */
while (!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT));

  /* Send slave Address in read direction & wait event */
I2C_Send7bitAddress(CP_Add, I2C_DIRECTION_RX);
/* Test on EV6 and clear it */
while (!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));
I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);

  /* While there is data to be read */
  while(NumByteToRead)
  {
if(NumByteToRead == 1)
{
   /* Disable Acknowledgement */
   I2C_AcknowledgeConfig(I2C_ACK_NONE);

   /* Send STOP Condition */
   I2C_GenerateSTOP(ENABLE);
}
/* Test on EV7 and clear it */
if(I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED))
{
   /* Read a byte from the EEPROM */
   *pBuffer = I2C_ReceiveData();
   /* Point to the next location where the byte read will be saved */
   pBuffer++;

   /* Decrement the read bytes counter */
   NumByteToRead--;
}
  }
  /* Enable Acknowledgement to be ready for another reception */
  I2C_AcknowledgeConfig(I2C_ACK_CURR);
}

设置I2C频率是35K，非标准的，输入给I2C的频率设为8M，我用的时钟是内部8M的时钟，用I2C这两个口做模拟I2C是可以用的，实在想不明白了

只看该作者 · 2010-5-4 12:00

应该是硬件的问题，ST的I2C好像不能用。

只看该作者 · 2010-5-4 12:59

我问ST公司的工程师，他说这个例子在他们的DEMO板上读写EEPROM是可以的，我就纳闷勒,太奇怪了

只看该作者 · 2010-5-4 20:42

ST的I2C不能用？？

只看该作者 · 2010-5-4 20:52

应该不会吧，只是比较不好调

只看该作者 · 2010-5-4 21:07

有人做过吗？给点意见啊，我都弄好几天了，郁闷得很啦

只看该作者 · 2010-5-5 11:50

我没用过ST的Demo，但是我用使用内部I2C没有问题，最好你自己看规格书看看相关的寄存器是不是按照程序配置成功。

只看该作者 · 2010-5-5 14:22

7楼的兄弟，是否可以参考下你的初始化程序呀?

只看该作者 · 2010-5-7 12:41

是不是你使用了第二复用功能的I2C接口但忘了改选项字节？

只看该作者 · 2010-5-7 17:41

什么选项字节，没看到啊？

只看该作者 · 2010-10-7 19:06

1# lo_xiaohua_ve
我今天终于找出问题了，ST的库没有问题，例程的一个函数有问题

void I2C_EE_ByteWrite(u8 WriteData, u16 WriteAddr)
在写完器件地址后就会死机，在

while(!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));
后面加上这个就好了
I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);

只看该作者 · 2010-10-8 21:00

原来是例程的函数有问题

只看该作者 · 2010-10-20 22:43

学习学习
咱正要弄这个

只看该作者 · 2010-11-22 17:16

我也用iic，我也用库，做从iic还可以，做主iic就从来没有看见波形出来过，最后还得用模拟，实在想不明白！！

只看该作者 · 2013-10-14 22:04

mark

只看该作者 · 2013-10-15 10:16

给你贴一个我读取数字温度传感器ADT7410的程序
/* init i2c */
void Bsp_IIC_Config(void)
{
GPIO_Init(GPIOE,
   GPIO_PIN_1|GPIO_PIN_2,
   GPIO_MODE_OUT_PP_HIGH_SLOW); //push-pull high output.2MHz.
CLK->PCKENR1 |= 0x01; //open i2c clk.
I2C_DeInit();

I2C_Init(100000, //100khz.
0xa0, //address.
I2C_DUTYCYCLE_2, //50% duty cycle.
I2C_ACK_CURR,
I2C_ADDMODE_7BIT,
16); //16MHz input clock.
}
void IIC_TEMP(void)
{
uint16_t Timeout;

//While the bus is busy,wait it.
Timeout = 0x1000;
while(I2C_GetFlagStatus( I2C_FLAG_BUSBUSY))
{
  if((Timeout--) == 0)
  {
nop();
  }
}

//Send START condition.
I2C_GenerateSTART(ENABLE);
// Test on EV5 and clear it (cleared by reading SR1 then writing to DR)
Timeout = 0x1000;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_MODE_SELECT))
{
  if((Timeout--) == 0)
  {
nop();
  }
}
// Send sensor address for write.
I2C_Send7bitAddress( (uint8_t)0x90, I2C_DIRECTION_TX);
// Test on EV6 and clear it.
Timeout = 0x1000;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
  if((Timeout--) == 0)
  {
nop();
  }
}
//Send the register address.
I2C_SendData((uint8_t)0x00);
// Test on EV8 and clear it.
Timeout = 0x1000;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
  if((Timeout--) == 0)
  {
nop();
  }
}
// Send START condition.
I2C_GenerateSTART(ENABLE);
// Test on EV5 and clear it (cleared by reading SR1 then writing to DR).
Timeout = 0x1000;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_MODE_SELECT))
{
  if((Timeout--) == 0)
  {
nop();
  }
}

// Send sensor address for read
I2C_Send7bitAddress((uint8_t)0x90, I2C_DIRECTION_RX);
// Test on EV6 and clear it.
Timeout = 0x1000;
while(!I2C_CheckEvent(I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
{
  if((Timeout--) == 0)
  {
nop();
  }
}
// Test on EV7 and clear it.
Timeout = 0x1000;
while(!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED))
{
  if((Timeout--) == 0)
  {
nop();
  }
}
// Read temperature high byte from the sensor.
CanTX[1] = I2C_ReceiveData();
// Disable Acknowledgement
I2C_AcknowledgeConfig(I2C_ACK_NONE);
IIC_Delay(1); //at least delay 9*10us.

// Read temperature low byte from the sensor.
CanTX[2] = I2C_ReceiveData();
// Program the STOP
I2C_GenerateSTOP(ENABLE);

// eable Acknowledgement
I2C_AcknowledgeConfig(I2C_ACK_CURR);

CanTX[0] = 0x35;
CAN_Transmit(0x55a,
   CAN_Id_Standard,
   CAN_RTR_Data,
   3,
   CanTX);
}
/* delay 0.2ms*times */
void IIC_Delay(uint8_t times)
{
volatile uint8_t dly;

while(times--)
{
  for(dly=220; dly>0; dly--);
  for(dly=220; dly>0; dly--);
  for(dly=220; dly>0; dly--);
}
}