void writeRegA0(uint8_t slave, uint8_t adr, uint8_t dat) {       /* <2.12w> I2C data write */
G_SendI2C_data[0] = adr;
G_SendI2C_data[1] = dat;
int i=0;
/* ST,SAD+W,SAK,SUB,SAK,DATA,SAK */
i2cA0_error = 0U;
i2cA0s_status = 1U;
while(HAL_I2C_Master_Transmit(&hi2c12,adr,(uint8_t*)dat,2,10) != HAL_OK)    {
  printf("HAL_I2C_GetError(&hi2c1)W1:%x\r\n",HAL_I2C_GetError(&hi2c12));
  if(i++==5)return;
  if (HAL_I2C_GetError(&hi2c12) != HAL_I2C_ERROR_AF)
  {
   //Error_Handler();
  }
}
// R_IICA0_Master_Send((slave), &G_SendI2C_data[0], 2, 10);
这个出现HAL_I2C_GetError(&hi2c1)W1:4
怎么解读

您的I2C 传送 HAL_I2C_Master_Transmit 有问题，先调试 I2C 通迅 OK 吧。