Smooth video playback from SD on STM32 and ST7735 1.8" 128x160 using DMA and fast SPI 36Mbps interface
Achieved 34 fps using fast Samsung SD card
YouTube video:
| LCD pin | LCD pin name | STM32 |
|---|---|---|
| #01 | LED | 3.3V |
| #02 | SCK | PA5/SCK |
| #03 | SCA | PA7/MOSI |
| #04 | A0/DC | PA1 or any digital |
| #05 | RESET | PA0 or any digital |
| #06 | CS | PA2 or any digital |
| #07 | GND | GND |
| #08 | VCC | 3.3V |
| SD pin | SD pin name | STM32 |
|---|---|---|
| #01 | SD_SCK | PA5 |
| #02 | SD_MISO | PA6 |
| #03 | SD_MOSI | PA7 |
| #04 | SD_CS | PA4 |
- Tested with stm32duino and Arduino IDE 1.6.5
- SD uses faster STM32 SPI1 interface which supports 36 Mbps
- Not all SD cards work at 36MBps
- Slow card at 18Mbps gives 22-23fps
- Fast card at 18Mbps gives 25-26fps
- Fast card at 36Mbps gives 33-34fps
- SdFat library uses DMA mode for SPI transfer
- Big buffer in RAM is used to speed up SPI/DMA transfer from SD
- SPI1 is shared between LCD and SD card
- Demo videos used in the video are taken from my older project and are not optimal (200x120 resolution - only 160x120 part is displayed on LCD)