LCD驱动求救

只看该作者 · 2017-7-20 15:51

HAL_StatusTypeDef HAL_LCD_Write(LCD_HandleTypeDef *hlcd, uint32_t RAMRegisterIndex, uint32_t RAMRegisterMask, uint32_t Data)
{
  uint32_t tickstart = 0x00U;

  if((hlcd->State == HAL_LCD_STATE_READY) || (hlcd->State == HAL_LCD_STATE_BUSY))
  {
/* Check the parameters */
assert_param(IS_LCD_RAM_REGISTER(RAMRegisterIndex));

if(hlcd->State == HAL_LCD_STATE_READY)
{
   /* Process Locked */
   __HAL_LOCK(hlcd);
   hlcd->State = HAL_LCD_STATE_BUSY;

   /* Get timeout */
   tickstart = HAL_GetTick();

   /*!< Wait Until the LCD is ready */
  while(__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDR) != RESET)
   {
      if((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
      {
      hlcd->ErrorCode = HAL_LCD_ERROR_UDR;
      /* Process Unlocked */
      __HAL_UNLOCK(hlcd);
      return HAL_TIMEOUT;
      }
   }
}
/* Copy the new Data bytes to LCD RAM register */
MODIFY_REG(hlcd->Instance->RAM[RAMRegisterIndex], ~(RAMRegisterMask), Data);

return HAL_OK;
  }
  else
  {
return HAL_ERROR;
  }
}
在使用这个函数时，RAMRegisterMask，这个参数该怎么代值啊，和Data参数的联系是什么  ？、、？、