论坛 › 问答 › STM32L496 - DCMI (JPEG MODE)

frankstm32f 发表于 2018-9-7 22:13:46

STM32L496 - DCMI (JPEG MODE)

本帖最后由 frankstm32f 于 2018-9-7 22:14 编辑

各位前輩/高手 安安:

小弟不才，上來請教大家

1.請問有人有使用過STM32L496的DCMI來接收OV2640相機輸出的JPEG資料嗎?小弟參考了官方文檔AN5020 - Digital camera interface (DCMI) for STM32 MCUs
看的有不太懂
在
DCMI availability and features across STM32 MCUs (P.13)
STM32L4x6- JPEG codec (NO)
可是在
ST的DCMI有支援 Capture of JPEG data: the data is captured in JPEG format to be stored in the SDRAM. (P.56)
因此想問問STM32L496或是stm32L4帶DCMI是否都可以支援Capture of JPEG data呢?

2.

另外小弟有嘗試使用STM32L496來收OV2640 JPEG資料，
但是卻一直進 HAL_DCMI_ErrorCallback
HAL_DCMI_ErrorCallback
ErrorCode:0x41
pBuffPtr:0
XferSize:0
pCircularBuffer:0
HalfCopyLength:0

但是缺查部到 ErrorCode:0x41 是什麼意思...
有請各位前輩和高手幫忙解答

附上DCMI配置 與部分程式

#definePIXEL_WIDTH    ((uint16_t)240)
#definePIXEL_HEIGHT   ((uint16_t)320)

uint16_t pBuffer;

if(BSP_CAMERA_Init(CAMERA_J320x240) == CAMERA_OK)
{
      printf ("CAMERA_OK \r\n");
      #if 1
      /* Wait 1s before Camera snapshot */
      HAL_Delay(1000);
      if(HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT , (uint32_t)pBuffer, PIXEL_WIDTH*PIXEL_WIDTH) != HAL_OK)
      {
                printf ("HAL_DCMI_Start_DMA_FAIL\r\n");
      }
      #endif
} else {
      printf ("CAMERA_FAIL \r\n");
}


/* DCMI init function */
static void MX_DCMI_Init(void)
{

hdcmi.Instance = DCMI;
hdcmi.Init.SynchroMode = DCMI_SYNCHRO_HARDWARE;
hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_RISING;
hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_LOW;
hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_LOW;
hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME;
hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_8B;
hdcmi.Init.JPEGMode = DCMI_JPEG_ENABLE;
hdcmi.Init.ByteSelectMode = DCMI_BSM_ALL;
hdcmi.Init.ByteSelectStart = DCMI_OEBS_ODD;
hdcmi.Init.LineSelectMode = DCMI_LSM_ALL;
hdcmi.Init.LineSelectStart = DCMI_OELS_ODD;
      HAL_DCMI_MspInit(&hdcmi);
if (HAL_DCMI_Init(&hdcmi) != HAL_OK)
{
    _Error_Handler(__FILE__, __LINE__);
}

}

/* DMA2D init function */
static void MX_DMA2D_Init(void)
{

hdma2d.Instance = DMA2D;
hdma2d.Init.Mode = DMA2D_M2M;
hdma2d.Init.ColorMode = DMA2D_OUTPUT_RGB565;
hdma2d.Init.OutputOffset = 0;
      hdma2d.Init.RedBlueSwap   = DMA2D_RB_REGULAR;      /* No R&B swap for the output image */
hdma2d.Init.AlphaInverted = DMA2D_REGULAR_ALPHA;   /* No alpha inversion for the output image */

      
      /* DMA2D Callbacks Configuration */
hdma2d.XferCpltCallback= TransferComplete;
hdma2d.XferErrorCallback = TransferError;
      
hdma2d.LayerCfg.InputOffset = 0;
hdma2d.LayerCfg.InputColorMode = DMA2D_INPUT_RGB565;
hdma2d.LayerCfg.AlphaMode = DMA2D_NO_MODIF_ALPHA;
hdma2d.LayerCfg.InputAlpha = 0xFF;
hdma2d.LayerCfg.AlphaInverted = DMA2D_REGULAR_ALPHA;
hdma2d.LayerCfg.RedBlueSwap = DMA2D_RB_REGULAR;
if (HAL_DMA2D_Init(&hdma2d) != HAL_OK)
{
    _Error_Handler(__FILE__, __LINE__);
}

if (HAL_DMA2D_ConfigLayer(&hdma2d, 1) != HAL_OK)
{
    _Error_Handler(__FILE__, __LINE__);
}

}


/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA2_CLK_ENABLE();

/* DMA interrupt init */
/* DMA2_Channel6_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Channel6_IRQn, 15, 0);
HAL_NVIC_EnableIRQ(DMA2_Channel6_IRQn);

}


謝謝

feixiang20 发表于 2018-9-7 22:58:05

打印机没激活？

frankstm32f 发表于 2018-9-7 23:23:53

請問打印機沒有激活是什麼意思

枫叶-400015 发表于 2019-1-11 23:52:27

亲，搞定没，我也在整

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