/**
* @brief Enables the display.
* @retval None
*/
void BSP_LCD_DisplayOn(void)
{
/* Display On */
__HAL_LTDC_ENABLE(&hLtdcHandler);
HAL_GPIO_WritePin(LCD_DISP_GPIO_PORT, LCD_DISP_PIN, GPIO_PIN_SET); /* Assert LCD_DISP pin */
HAL_GPIO_WritePin(LCD_BL_CTRL_GPIO_PORT, LCD_BL_CTRL_PIN, GPIO_PIN_SET); /* Assert LCD_BL_CTRL pin */
}
/**
* @brief Enables the display.
* @retval None
*/
void BSP_LCD_DisplayOn(void)
{
/* Display On */
__HAL_LTDC_ENABLE(<dc_handle);
HAL_GPIO_WritePin(LCD_DISP_GPIO_PORT, LCD_DISP_PIN, GPIO_PIN_SET);
HAL_GPIO_WritePin(LCD_BL_CTRL_GPIO_PORT, LCD_BL_CTRL_PIN, GPIO_PIN_SET);
}
/**
* @brief Disable/Enable LTDC activity as in DSI Video mode the LTDC is all the time
* in active window pumping data with its DMA, it creates a huge bandwidth consumption
* that can penalize other IPs, here the save to SD functionality.
* @param Enable_LTDC : 0 to disable LTDC, 1 to re-enable LTDC
* @retval None
*/
static void LTDC_Operation(uint32_t Enable_LTDC)
{
if(Enable_LTDC == 1)
{
__HAL_LTDC_ENABLE(&(hltdc_eval)); /* Switch back On bit LTDCEN */
}
else if (Enable_LTDC == 0)
{
__HAL_LTDC_DISABLE(&(hltdc_eval)); /* Switch Off bit LTDCEN */
}
}
/**
* @brief Disable/Enable LTDC activity as in DSI Video mode the LTDC is all the time
* in active window pumping data with its DMA, it creates a huge bandwidth consumption
* that can penalize other IPs, here the save to SD functionality.
* @param Enable_LTDC : 0 to disable LTDC, 1 to re-enable LTDC
* @retval None
*/
static void LTDC_Operation(uint32_t Enable_LTDC)
{
/* Desactivate the DSI wrapper */
DSI->WCR &= ~(DSI_WCR_DSIEN);
if(Enable_LTDC == 1)
{
__HAL_LTDC_ENABLE(&hltdc_eval); /* Switch back On bit LTDCEN */
}
else if (Enable_LTDC == 0)
{
__HAL_LTDC_DISABLE(&hltdc_eval); /* Switch Off bit LTDCEN */
}
/* Reactivate the DSI Wrapper */
DSI->WCR |= DSI_WCR_DSIEN;
}
/**
* @brief Enables the display.
* @param None
* @retval None
*/
void BSP_LCD_DisplayOn(void)
{
/* Display On */
__HAL_LTDC_ENABLE(&hltdc_eval);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
uint8_t lcd_status = LCD_OK;
/* This sample code displays a fixed image 800x480 on LCD KoD in */
/* orientation mode landscape and DSI mode video burst */
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization: global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Initialize used LED1 and LED3 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED3);
/* Configure user push-button */
BSP_PB_Init(BUTTON_WAKEUP, BUTTON_MODE_GPIO);
/* Initialize the LCD DSI in Video Burst mode with LANDSCAPE orientation */
lcd_status = BSP_LCD_Init();
OnError_Handler(lcd_status != LCD_OK);
/* Program a line event at line 0 */
HAL_LTDC_ProgramLineEvent(&hltdc_eval, 0);
/* Copy texture to be displayed on LCD from Flash to SDRAM */
CopyPicture((uint32_t *)&candies_800x480_argb8888, (uint32_t *)LCD_FB_START_ADDRESS, 0, 0, BSP_LCD_GetXSize(), BSP_LCD_GetYSize());
BSP_LCD_LayerDefaultInit(LTDC_ACTIVE_LAYER_BACKGROUND, LCD_FB_START_ADDRESS);
BSP_LCD_SelectLayer(LTDC_ACTIVE_LAYER_BACKGROUND);
/* Prepare area to display frame number in the image displayed on LCD */
BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
BSP_LCD_FillRect(0, 400, BSP_LCD_GetXSize(), 80);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_SetBackColor(LCD_COLOR_BLUE);
BSP_LCD_SetFont(&Font16);
/* Display title */
BSP_LCD_DisplayStringAt(0, 420, (uint8_t *) "LCD_DSI_ULPM_Data example", CENTER_MODE);
BSP_LCD_DisplayStringAt(0, 440, (uint8_t *) "Press TAMPER button to enter ULPM", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
BSP_LCD_SetBackColor(LCD_COLOR_BLUE);
BSP_LCD_SetFont(&Font16);
/* Infinite loop */
while (1)
{
/* Clear previous line */
BSP_LCD_ClearStringLine(460);
/* New text to display */
sprintf(str_display, ">> Frame Nb : %lu", frameCnt);
/* Print updated frame number */
BSP_LCD_DisplayStringAt(0, 460, (uint8_t *)str_display, CENTER_MODE);
if (CheckForUserInput() > 0)
{
/* Clear previous line */
BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_ClearStringLine(440);
BSP_LCD_DisplayStringAt(0, 440, (uint8_t *) "Enter ULPM - switch Off LCD 6 seconds", CENTER_MODE);
BSP_LCD_SetTextColor(LCD_COLOR_WHITE);
/* Display Off with ULPM management Data lane only integrated */
BSP_LCD_DisplayOff();
HAL_Delay(1000);
/* Switch Off bit LTDCEN */
__HAL_LTDC_DISABLE(&hltdc_eval);
/* Enter ultra low power mode (data lane only integrated) */
HAL_DSI_EnterULPMData(&hdsi_eval);
BSP_LED_On(LED1);
HAL_Delay(6000);
BSP_LCD_ClearStringLine(440);
BSP_LCD_DisplayStringAt(0, 440, (uint8_t *) " Exited ULPM with success - Press To enter Again ULPM. ", CENTER_MODE);
/* Exit ultra low power mode (data lane only integrated) */
HAL_DSI_ExitULPMData(&hdsi_eval);
BSP_LED_Off(LED1);
/* Switch On bit LTDCEN */
__HAL_LTDC_ENABLE(&hltdc_eval);
/* Display On with ULPM exit Data lane only integrated */
BSP_LCD_DisplayOn();
}
}
}
