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本帖最后由 hpdell 于 2017-5-21 15:42 编辑 请教下，使用 stm32f7x的硬件 jpeg 解码功能，图片不能够横屏显示？？ 但是 显示字符，画图等完全可以横屏显示(四个方向可以任意显示)， 还有在图片上显示字符，具体见下面程序的描述 貌似设置横竖屏显示的函数就在下面这个函数里面，但是不知道该如果修改 ？？？？ static uint32_t JPEG_MCU_YCbCr420_ARGB_ConvertBlocks(uint8_t *pInBuffer, uint8_t *pOutBuffer, uint32_t BlockIndex, uint32_t DataCount, uint32_t *ConvertedDataCount) { uint32_t numberMCU; uint32_t i,j,k, currentMCU, xRef,yRef; uint32_t refline; int32_t ycomp, crcomp, cbcomp; int32_t c_red, c_blue, c_green; uint8_t *pOutAddr, *pOutAddr2; uint8_t *pChrom, *pLum; numberMCU = DataCount / YCBCR_420_BLOCK_SIZE; currentMCU = BlockIndex; while(currentMCU < (numberMCU + BlockIndex)) { xRef = ((currentMCU *16) / JPEG_ConvertorParams.WidthExtend)*16; yRef = ((currentMCU *16) % JPEG_ConvertorParams.WidthExtend); refline = JPEG_ConvertorParams.ScaledWidth * xRef + (JPEG_BYTES_PER_PIXEL*yRef); currentMCU++; pChrom = pInBuffer + 256; /* pChroma = pInBuffer + 4*64 */ pLum = pInBuffer; for(i= 0; i < 16; i+=2) { if(i == 8) { pLum = pInBuffer + 128; } if(refline < JPEG_ConvertorParams.ImageSize_Bytes) { pOutAddr = pOutBuffer + refline; pOutAddr2 = pOutAddr + JPEG_ConvertorParams.ScaledWidth; for(k= 0; k<2; k++) { for(j=0; j < 8; j+=2) { cbcomp = (int32_t)(*(pChrom)); c_blue = (int32_t)(*(CB_BLUE_LUT + cbcomp)); crcomp = (int32_t)(*(pChrom + 64)); c_red = (int32_t)(*(CR_RED_LUT + crcomp)); c_green = ((int32_t)(*(CR_GREEN_LUT + crcomp)) + (int32_t)(*(CB_GREEN_LUT + cbcomp))) >> 16; #if (JPEG_RGB_FORMAT == JPEG_ARGB8888) ycomp = (int32_t)(*(pLum +j)); *(__IO uint32_t *)pOutAddr = (CLAMP(ycomp + c_red) << JPEG_RED_OFFSET) | \ (CLAMP( ycomp + c_green) << JPEG_GREEN_OFFSET) | \ (CLAMP(ycomp + c_blue) << JPEG_BLUE_OFFSET); /**********/ ycomp = (int32_t)(*(pLum +j +1)); *((__IO uint32_t *)(pOutAddr + 4)) = (CLAMP(ycomp + c_red) << JPEG_RED_OFFSET) | \ (CLAMP( ycomp + c_green) << JPEG_GREEN_OFFSET) | \ (CLAMP(ycomp + c_blue) << JPEG_BLUE_OFFSET); /**********/ ycomp = (int32_t)(*(pLum +j +8)); *(__IO uint32_t *)pOutAddr2 = (CLAMP(ycomp + c_red) << JPEG_RED_OFFSET) | \ (CLAMP( ycomp + c_green) << JPEG_GREEN_OFFSET) | \ (CLAMP(ycomp + c_blue) << JPEG_BLUE_OFFSET); /**********/ ycomp = (int32_t)(*(pLum +j +8 +1)); *((__IO uint32_t *)(pOutAddr2 +4)) = (CLAMP(ycomp + c_red) << JPEG_RED_OFFSET) | \ (CLAMP( ycomp + c_green) << JPEG_GREEN_OFFSET) | \ (CLAMP(ycomp + c_blue) << JPEG_BLUE_OFFSET); #elif (JPEG_RGB_FORMAT == JPEG_RGB888) ycomp = (int32_t)(*(pLum +j)); pOutAddr[JPEG_RED_OFFSET/8] = CLAMP(ycomp + c_red); pOutAddr[JPEG_GREEN_OFFSET/8] = CLAMP(ycomp + c_green); pOutAddr[JPEG_BLUE_OFFSET/8] = CLAMP(ycomp + c_blue); /**********/ ycomp = (int32_t)(*(pLum +j +1)); pOutAddr[3 + JPEG_RED_OFFSET/8] = CLAMP(ycomp + c_red); pOutAddr[3 + JPEG_GREEN_OFFSET/8] = CLAMP(ycomp + c_green); pOutAddr[3 + JPEG_BLUE_OFFSET/8] = CLAMP(ycomp + c_blue); /**********/ ycomp = (int32_t)(*(pLum +j +8)); pOutAddr2[JPEG_RED_OFFSET/8] = CLAMP(ycomp + c_red); pOutAddr2[JPEG_GREEN_OFFSET/8] = CLAMP(ycomp + c_green); pOutAddr2[JPEG_BLUE_OFFSET/8] = CLAMP(ycomp + c_blue); /**********/ ycomp = (int32_t)(*(pLum +j +8 +1)); pOutAddr2[3+ JPEG_RED_OFFSET/8] = CLAMP(ycomp + c_red); pOutAddr2[3 + JPEG_GREEN_OFFSET/8] = CLAMP(ycomp + c_green); pOutAddr2[3 + JPEG_BLUE_OFFSET/8] = CLAMP(ycomp + c_blue); #elif (JPEG_RGB_FORMAT == JPEG_RGB565) // 使用rgb565模式，地址设置貌似就在此处，但是如果按照显示画图形的方法来设置地址的话，那这个 x, y又该如何获取啊 ？？？ ycomp = (int32_t)(*(pLum +j)); *(__IO uint16_t *)pOutAddr = ((CLAMP(ycomp + c_red) >> 3) << JPEG_RED_OFFSET) | \ ((CLAMP( ycomp + c_green) >> 2) << JPEG_GREEN_OFFSET) | \ ((CLAMP(ycomp + c_blue) >> 3) << JPEG_BLUE_OFFSET); /**********/ ycomp = (int32_t)(*(pLum +j +1)); *((__IO uint16_t *)(pOutAddr + 2)) = ((CLAMP(ycomp + c_red) >> 3) << JPEG_RED_OFFSET) | \ ((CLAMP( ycomp + c_green) >> 2) << JPEG_GREEN_OFFSET) | \ ((CLAMP(ycomp + c_blue) >> 3) << JPEG_BLUE_OFFSET); /**********/ ycomp = (int32_t)(*(pLum +j +8)); *(__IO uint16_t *)pOutAddr2 = ((CLAMP(ycomp + c_red) >> 3) << JPEG_RED_OFFSET) | \ ((CLAMP( ycomp + c_green) >> 2) << JPEG_GREEN_OFFSET) | \ ((CLAMP(ycomp + c_blue) >> 3) << JPEG_BLUE_OFFSET); /**********/ ycomp = (int32_t)(*(pLum +j +8 +1)); *((__IO uint16_t *)(pOutAddr2 +2)) = ((CLAMP(ycomp + c_red) >> 3) << JPEG_RED_OFFSET) | \ ((CLAMP( ycomp + c_green) >> 2) << JPEG_GREEN_OFFSET) | \ ((CLAMP(ycomp + c_blue) >> 3) << JPEG_BLUE_OFFSET); #endif /* JPEG_RGB_FORMAT */ pOutAddr += JPEG_BYTES_PER_PIXEL * 2; pOutAddr2 += JPEG_BYTES_PER_PIXEL * 2; pChrom++; } pLum += 64; } pLum = pLum - 128 + 16; refline += 2*JPEG_ConvertorParams.ScaledWidth; } } pInBuffer += YCBCR_420_BLOCK_SIZE; } return numberMCU; } 显示效果图片如下： 正常的竖屏显示， 
竖屏 180 度 显示图片如下： 
这个竖屏 180度显示，字符汉字都已经正常显示了，唯独图片没有 ？？ 旋转180度显示图片的地址计算我是参考我的 图形显示参数修改的，显示图形任意方向显示是没有问题的 // 使用rgb565模式，地址设置貌似就在此处，但是如果按照显示画图形的方法来设置地址的话，那这个 x, y又该如何获取啊 ？？？ |
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我的是 800*1280的 lvds 屏，
请教有没有关于 这个硬件解码 jpg 进行 横竖屏显示的历程啊 ？？