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Blank App

This is a blank application for the STM32F769I-DISCO board. It's based on a standard ioc file for this board type with a minimum of changes to make it work.

Versions used:

  • STMCubeIDE 1.10.1
  • STM32Cube_FW_F7_V1.17.0

How to replicate the setup

Use STMCubeIDE to create a new project using 'New STM32 Project'. Then from the board selector select STM32F769I-DISCO. On the next screen make sure to select C++ if you want to use TouchGFX later on. Finish the generation and select yes to generate code if you get a popup about NEWLIB.

I made some changes to the default IOC that made the BSP drivers compile without issues.

  • In 'System Core' deactivate WWDG
  • In 'Connectivity' set SDMMC2 to 'SD 4bits Wide bus'
  • In 'Computing' set DFSDM1 Channel 0, 1, 4 and 5 to 'Parallel input'
  • In 'Middleware' set FREERTOS/Include parameters/vTaskDelayUtil to 'Enabled'
  • In 'Middleware' set FREERTOS/Advanced settings/USE_NEWLIB_REENTRANT to 'Enabled'

If you can't be bothered to deal with watchdogs immediately you can deactivate the IWDG as well in 'System Core'. For now just comment out the line 'MX_IWDG_Init();' to disable the watchdog for a bit, our bsp calls take too long. Note this will be enabled again if you generate code from the ioc file.

After making these changes generate the code.

Now you have a clean project, but it's missing the board specific stuff. The BSP files are in the supporting repository, but not automagically copied to the project. Locate your 'STM32Cube_FW_F7_V1.17.0' folder and copy the directory 'Drivers/BSP/STM32F769I-Discovery' to your project in the same location. From the 'Drivers/BSP/Components' directory copy the directories Common, adv7533, ft6x06, mx25l512, otm8009a and wm8994 to the same location in your project. From the 'Utilities' Folder copy Fonts to the same location in your project.

The following directies should now show up in the IDE after a refresh:

./Drivers/BSP/STM32F769I-Discovery
./Drivers/BSP/Components
./Drivers/BSP/Components/ft6x06
./Drivers/BSP/Components/adv7533
./Drivers/BSP/Components/otm8009a
./Drivers/BSP/Components/Common
./Drivers/BSP/Components/wm8994
./Drivers/BSP/Components/mx25l512
./Utilities/Fonts

Note: These locations will be removed when the ioc project is regenerated. Just copy them back at will.

At this point you should be able to compile and run the project without errors. It just doesn't do anything yet.

Add the following pieces of code in main.c for a quick 'Hello World'

Include the BSP

/* USER CODE BEGIN Includes */
#include "stm32f769i_discovery.h"
#include "stm32f769i_discovery_lcd.h"
#include "stm32f769i_discovery_qspi.h"
#include "image.h"
/* USER CODE END Includes */

Supporting functions

/* USER CODE BEGIN 0 */
static uint32_t LCD_X_Size = 0;
static uint32_t LCD_Y_Size = 0;
osThreadId watchdogTaskHandle;

/**
  * @brief  On Error Handler on condition TRUE.
  * @param  condition : Can be TRUE or FALSE
  * @retval None
  */
static void OnError_Handler(uint32_t condition)
{
  if(condition)
  {
    BSP_LED_On(LED1);
    while(1) { ; } /* Blocking on error */
  }
}

/**
 * @brief  Task to periodically refresh the watchdog
 * @param  pvParameters : Not used
 * @retval None, endless loop
 */
void prvWatchdogTask( const void *pvParameters )
{
    portTickType        xLastWakeTime;
    (void) pvParameters;

    xLastWakeTime = xTaskGetTickCount();

    IWDG_HandleTypeDef hiwdg;
    hiwdg.Instance = IWDG;

    for( ;; )
    {
        xLastWakeTime = xTaskGetTickCount();

        HAL_IWDG_Refresh(&hiwdg);

        vTaskDelayUntil( &xLastWakeTime, pdMS_TO_TICKS(100));
    }
}

/* USER CODE END 0 */

Enable the task to refresh the watchdog

  /* USER CODE BEGIN RTOS_THREADS */
  osThreadDef(watchdogTask, prvWatchdogTask, osPriorityAboveNormal, 0, 1024);
  watchdogTaskHandle = osThreadCreate(osThread(watchdogTask), NULL);

  /* USER CODE END RTOS_THREADS */

Show stuff on the LCD and enable the green LED when completed

  /* USER CODE BEGIN 2 */
  
  // Enable access to the qspi flash chip in memory mapped mode
  uint8_t bsp_status = 0;
  bsp_status = BSP_QSPI_Init();
  OnError_Handler(bsp_status != QSPI_OK);
  bsp_status = BSP_QSPI_EnableMemoryMappedMode();
  OnError_Handler(bsp_status != QSPI_OK);
  HAL_NVIC_DisableIRQ(QUADSPI_IRQn);

  // Enable the LCD
  uint8_t  lcd_status = LCD_OK;
  lcd_status = BSP_LCD_Init();
  OnError_Handler(lcd_status != LCD_OK);

  // Get the LCD Width and Height
  LCD_X_Size = BSP_LCD_GetXSize();
  LCD_Y_Size = BSP_LCD_GetYSize();

  // Configure the LCD layers with their framebuffers in SRAM
  BSP_LCD_LayerDefaultInit(0, LCD_FB_START_ADDRESS);
  BSP_LCD_LayerDefaultInit(1, LCD_FB_START_ADDRESS + (800*480*4));
  BSP_LCD_SetColorKeying(1, LCD_COLOR_TRANSPARENT);

  // Draw the image on layer 0
  BSP_LCD_SelectLayer(0);
  BSP_LCD_DrawBitmap(0, 0, webb_first_f769idisco);

  // Draw text on layer one and use transparency to make the background image visible
  BSP_LCD_SelectLayer(1);
  BSP_LCD_Clear(LCD_COLOR_TRANSPARENT);
  BSP_LCD_SetBackColor(LCD_COLOR_TRANSPARENT);
  BSP_LCD_SetTextColor(LCD_COLOR_WHITE);

  BSP_LCD_DisplayStringAt(0,LINE(2) , (uint8_t *)"Hello World", CENTER_MODE);
  BSP_LCD_SetFont(&Font16);
  BSP_LCD_DisplayStringAt(0,LINE(5), (uint8_t *)"Hello World example with DSI LCD", CENTER_MODE);
  BSP_LCD_DisplayStringAt(0,LINE(6), (uint8_t *)"made for the F769I Discovery board", CENTER_MODE);

  BSP_LED_Init(LED2);
  BSP_LED_Toggle(LED2);

  MX_IWDG_Init();

  /* USER CODE END 2 */

Enable the red led on HAL error.

  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  BSP_LED_Init(LED1);
  BSP_LED_On(LED1);
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */

Note: The program will fail if there is no SD card in the slot. Comment out the line with MX_SDMMC2_SD_Init(); to avoid this.

Using QSPI Memory for images

With the example code above the image is loaded from the scarce flash. If you start adding more code that will become an issue. The board has SDRAM connected with QSPI to offer additional space for static stuff like this. At the cost of a little performance as memory access is slower using QSPI.

The correct linker attributes are set in image.h to tell the linker to put the image in the SDRAM, but changes to the .ld files are required to tell the linker where to put the data.

Edit the files STM32F769NIHX_FLASH.ld and STM32F769NIHX_RAM.ld. In the MEMORY section add:

QSPI (rx)         : ORIGIN = 0x90000000, LENGTH = 64M

And near the bottom of the file before the closing bracket add:

ExtFlashSection : { *(ExtFlashSection) } >QSPI

Note that you need to use the CubeProgrammer to specifically upload the part of the elf image that needs to be place into the QSPI SDRAM memory. To do so enable the MX25L512G_STM32F769I-DISCO loader in the additional loaders section and configure the programmer to also load to address 0x90000000 by typing it in the Address field.