gd32l23cct6 硬件i2c 等待TI / RBNE标志位超时

只看该作者 · 2023-9-21 14:18

gd32l23cct6芯片在硬件i2c读写过程中会偶尔出现write函数在TI标志位超时跳出，read函数在RBNE标志位超时跳出，TIMEOUT时间测试200ms+，在这两个标志位超时异常跳出导致i2c通信时序缺少stop位，bsy标志位一直位1，i2c再也无法继续通信，一定要通过复位i2c外设才能解决。硬件i2c驱动代码去下
int gd32_i2c_write(unsigned char bus, unsigned short addr, unsigned char *data, unsigned int data_len)
{
drv_i2c_mgr_t *i2c_mgr = NULL;
unsigned int timeout = DRV_I2C_TIME_OUT;
unsigned int idx;

if (bus >= DRV_I2C_BUS_MAX)
{
      return -1;
}

i2c_mgr = &s_st_i2c_mgr[bus];
if (0 == i2c_mgr->is_init)
{
      return -1;
}

/* wait until I2C bus is idle */
timeout = DRV_I2C_TIME_OUT;
i2c_master_addressing(i2c_mgr->periph, addr<<1, I2C_MASTER_TRANSMIT);
i2c_address_config(i2c_mgr->periph, DRV_I2C_OWN_ADDRESS7, I2C_ADDFORMAT_7BITS);
/* len not include addr byte */
i2c_transfer_byte_number_config(i2c_mgr->periph, data_len);
while(i2c_flag_get(i2c_mgr->periph, I2C_FLAG_I2CBSY))
{
      if ((timeout--) == 0)
      {
         return -1;
      }
}

/* send a start condition to I2C bus */
timeout = DRV_I2C_TIME_OUT;
i2c_start_on_bus(i2c_mgr->periph);

/* wait until the transmit data buffer is empty */
I2C_STAT(i2c_mgr->periph) |= I2C_STAT_TBE;
while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_TBE))
{
      if ((timeout--) == 0)
      {
         return -1;
      }
}

for(idx = 0; idx < data_len; idx++)
{
      /* data transmission */
      timeout = DRV_I2C_TIME_OUT;
      i2c_data_transmit(i2c_mgr->periph, data[idx]);
      while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_TI))
      {
         if ((timeout--) == 0)
         {
            LOG_DIRECT_ERR("ti\r\n");
            return -1;
         }
      }
}
timeout = DRV_I2C_TIME_OUT;
while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_TC))
{
      if ((timeout--) == 0)
      {
         return -1;
      }
}

/* send a stop condition to I2C bus */
i2c_stop_on_bus(i2c_mgr->periph);
/* wait until stop condition generate */
while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_STPDET))
{
      if ((timeout--) == 0)
      {
         return -1;
      }
}

/* clear the STPDET bit */
i2c_flag_clear(i2c_mgr->periph, I2C_FLAG_STPDET);

return 0;
}

int gd32_i2c_read(unsigned char bus, unsigned short addr, unsigned char *data, unsigned int data_len)
{
drv_i2c_mgr_t *i2c_mgr = NULL;
unsigned int timeout = DRV_I2C_TIME_OUT;
unsigned int idx;

if (bus >= DRV_I2C_BUS_MAX)
{
      return -1;
}

i2c_mgr = &s_st_i2c_mgr[bus];
if (0 == i2c_mgr->is_init)
{
      /* I2C init fail ,value invalid */
      return -1;
}

/* wait until I2C bus is idle */
i2c_master_addressing(i2c_mgr->periph, addr<<1, I2C_MASTER_RECEIVE);
i2c_address_config(i2c_mgr->periph, addr<<1, I2C_ADDFORMAT_7BITS);
i2c_transfer_byte_number_config(i2c_mgr->periph, data_len);

timeout = DRV_I2C_TIME_OUT;
while(i2c_flag_get(i2c_mgr->periph, I2C_FLAG_I2CBSY))
{
      if ((timeout--) == 0)
      {
         return -1;
      }
}

/* send a start condition to I2C bus */
i2c_start_on_bus(i2c_mgr->periph);

for(idx = 0; idx < data_len; idx++)
{
      /* wait until the RBNE bit is set */
      timeout = DRV_I2C_TIME_OUT;
      while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_RBNE))
      {
         if ((timeout--) == 0)
         {
            LOG_DIRECT_ERR("rbne\r\n");
            return -1;
         }
      }
      /* read a data from I2C_DATA */
      data[idx] = i2c_data_receive(i2c_mgr->periph);
}

while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_TC))
{
      timeout = DRV_I2C_TIME_OUT;
      if ((timeout--) == 0)
      {
         return -1;
      }
}
/* send a stop condition to I2C bus */
i2c_stop_on_bus(i2c_mgr->periph);
/* wait until stop condition generate */
while(!i2c_flag_get(i2c_mgr->periph, I2C_FLAG_STPDET))
{
      timeout = DRV_I2C_TIME_OUT;
      if ((timeout--) == 0)
      {
         return -1;
      }
}

/* clear the STPDET bit */
i2c_flag_clear(i2c_mgr->periph, I2C_FLAG_STPDET);

return 0;
}

只看该作者 · 2023-9-21 17:37

补充一下：排查问题发现是在TBE标志位等待，异常情况的波形TBE标志位等待延时了20us左右，导致会在TI标志位等待超时跳出。手动在这个地方加了一个20us的延时函数测试验证问题就是出在这里，在TBE后TI前的地方加了一个us级延时函数，i2c必定异常。各位大佬有没有遇到过类似情况的，帮忙看看，谢谢！