int sensor_snapshot(struct image *image)
{
volatile uint32_t addr;
volatile uint16_t length;
addr = (uint32_t) fb->pixels;
if (sensor.pixformat==PIXFORMAT_JPEG) {
length = MAX_XFER_SIZE;
} else {
length =(fb->w * fb->h * 2)/4;
}
/* Lock framebuffer mutex */
mutex_lock(&fb->lock);
/* Start the DCMI */
HAL_DCMI_Start_DMA(&DCMIHandle,
DCMI_MODE_SNAPSHOT, addr, length);
/* Wait for frame */
while ((DCMI->CR & DCMI_CR_CAPTURE) != 0) {
}
if (sensor.pixformat == PIXFORMAT_GRAYSCALE) {
/* If GRAYSCALE extract Y channel from YUYV */
for (int i=0; i<(fb->w * fb->h); i++) {
fb->pixels[i] = fb->pixels[i*2];
}
} else if (sensor.pixformat == PIXFORMAT_JPEG) {
/* The frame is finished, but DMA still waiting
for data because we set max frame size
so we need to abort the DMA transfer here */
HAL_DMA_Abort(&DMAHandle);
/* Read the number of data items transferred */
fb->bpp = (MAX_XFER_SIZE - DMAHandle.Instance->NDTR)*4;
}
if (image != NULL) {
image->w = fb->w;
image->h = fb->h;
image->bpp = fb->bpp;
image->pixels = fb->pixels;
}
fb->ready = 1;
/* unlock framebuffer mutex */
mutex_unlock(&fb->lock);
while (fb->lock_tried) {
systick_sleep(2);
}
return 0;
}
/**
* @brief Starts the Camera capture in snapshot mode.
* @param buff: pointer to the Camera output buffer
* @retval None
*/
void BSP_CAMERA_SnapshotStart(uint8_t *buff)
{
/* Start the Camera capture */
HAL_DCMI_Start_DMA(&hdcmi_eval, DCMI_MODE_SNAPSHOT, (uint32_t)buff, GetSize(current_resolution));
}
/**
* @brief Starts the Camera capture in continuous mode.
* @param buff: pointer to the Camera output buffer
* @retval None
*/
void BSP_CAMERA_ContinuousStart(uint8_t *buff)
{
/* Start the Camera capture */
HAL_DCMI_Start_DMA(&hdcmi_eval, DCMI_MODE_CONTINUOUS, (uint32_t)buff, GetSize(current_resolution));
}
/**
* @brief Starts the camera capture in snapshot mode.
* @param buff: pointer to the camera output buffer
* @retval None
*/
void BSP_CAMERA_SnapshotStart(uint8_t *buff)
{
/* Start the camera capture */
HAL_DCMI_Start_DMA(&hDcmiEval, DCMI_MODE_SNAPSHOT, (uint32_t)buff, GetSize(CameraCurrentResolution));
}
