We found a bug while using Hardware JPEG.

[Kim KyungTack]

The environment I tested is as follows.

IDE: STM32CubeIDE​ 1.5.1

Package: STM32F767II

Package software version: 1.16.1

JPEG settings are as below.

​

However, there is a typo in the config file that is actually generated.

[ jpeg_utils_conf.h ]

#ifndef  __JPEG_UTILS_CONF_H__
#define  __JPEG_UTILS_CONF_H__
 
/* Includes ------------------------------------------------------------------*/
 
#include "stm32f7xx_hal.h"
#include "stm32f7xx_hal_jpeg.h"
 
/* Private define ------------------------------------------------------------*/
/** @addtogroup JPEG_Private_Defines
  * @{
  */
/* RGB Color format definition for JPEG encoding/Decoding : Should not be modified*/
#define JPEG_ARGB8888            0  /* ARGB8888 Color Format */
#define JPEG_RGB888              1  /* RGB888 Color Format   */
#define JPEG_RGB565              2  /* RGB565 Color Format   */
 
/*
 * Define USE_JPEG_DECODER
 */
 
#define USE_JPEG_DECODER 1 /* 1 or 0 ********* Value different from default value : 1 ********** */
/*
 * Define USE_JPEG_ENCODER
 */
 
#define USE_JPEG_ENCODER 0 /* 1 or 0 */
 
/*
 * Define JPEG_RGB_FORMAT
 */
#define JPEG_RGB_FORMAT JPEG_RGB888 /* JPEG_ARGB8888, JPEG_RGB888, JPEG_RGB565 ********* Value different from default value : 0 ********** */
 
/*  This is the problem.
 * Define JPEG_SWAP_RG
 */
#define JPEG_SWAP_RG 1 /* 0 or 1 */
 
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
 
#endif /* __JPEG_UTILS_CONF_H__ */

JPEG_SWAP_RB is correct, not JPEG_SWAP_RG.

For this reason, Red and Blue are not swapable.

[Imen.D]

Hello @Kim KyungTack ,

Swap RED, and Blue offsets if needs to change the color order by setting: * #define JPEG_SWAP_RB 1

This is mentioned in the AN4996 Application note Hardware JPEG codec peripheral:

Optionally red and blue swap can be selected using the #define JPEG_SWAP_RB (set to 1 to swap red and blue order in pixels)

Imen