Hello,
I'm trying to use the HW JPEG decoder on an STM32H743 MCU. When looking at the AN4996 Application Note, I found the following table:
However, I'm unable to come even close to these values... This is what I measured:
| JPEG decode | DMA2D YCbCr | |
| 320x240 | 2,5 ms | 2,5 ms |
| 640x480 | 10 ms | 12 ms |
I checked my code against the Examples from the Firmware Package:
- JPEG_MJPEG_VideoDecoding
- JPEG_DecodingFromFLASH_DMA
All my settings look similar. I'm decoding the JPEG image from DTCM RAM to external SDRAM. Compiler optimization has no effect (everything is done by DMA anyway)...
Is there anything else that has to be configured for the JPEG peripheral? Where are the values in the application note coming from?
