Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F7x8/JPEG/JPEG_CONFR4#0x0
JPEG codec configuration register 4
Huffman DC
Huffman AC
Quantization Table
Number of Block
Vertical Sampling Factor
Horizontal Sampling Factor
https://github.com/cmsis-svd/cmsis-svd-data