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AN5020 DCMI Example: STM32FGDISCOVERY with STM32F4DIS-CAM (OV9655)

F746GDISCO_DCMI

AN5020 DCMI Example: STM32FGDISCOVERY with STM32F4DIS-CAM (OV9655)

• IDE: Atollic TrueSTUDIO for STM32 with STM32CubeMX
• Display: ROCKTECH, 4.3-inch 480x272 LCD-TFT
• Camera: STM32F4DIS-CAM (OV9655, 1280x1024 SXGA)

Camera Module:

1. Picture Size
2. Frame Rate
3. Data Format
4. Scaling Image Output: The OV9655 is capable of scaling down the image size from VGA to 40x30. By using register bits
   • COM14[1] (0x3E)
   • COM16[0] (0x41)
   • POIDX (0x72)
   • XINDX (0x74)
   • YINDX (0x75) At certain image sizes, HREF is not consistent in a frame.

Notes:

1. use HSE 25MHz(X2, RCC_HSE_BYPASS) as the clock source
2. enable (LTDC,FMC) in STM32CubeMX
3. put font24.c in src folder, and no need to include the file in main.c
4. the LCD-TFT might burn if using the 320x240 resolution
5. some issues with STM32CubeMX code regeneration
6. in STM32CubeMX project settings, don't generate function calls for FMC and LTDC modules

2018.12.03

1. changed to double-buffer mode to use two banks of SDRAM, only supports Length <=0xFFFF
2. added MPU configuration according to AN4861 LTDC 6.2.7

2018.12.02

1. changed to using BSP Camera module and it uses HAL_DCMI_ConfigCROP to get a 480x272 image.

2018.12.01

1. changed to using BSP LCD module.

2018.11.28

1. generate codes with STM32CubeMX and add device files