DCMI OV2640 High resolution

[vlad23]

Posted on December 03, 2015 at 13:09

I have an evaluation board STM3240G-EVAL with camera OV2640.

I stored camera image in the external SRAM (2 MB).

How I can initialize the camera with a resolution of 1600x1200 (UXGA) in format RGB565?

I want to capture only 100 central lines. For this I use the function:

void DCMI_Read(uint16_t *img, uint32_t dummy, uint32_t rcv, uint32_t sz)

{

  volatile uint32_t data, i;

 

  DCMI-> CR | = DCMI_CR_CAPTURE;

 

  for (i = 0; i < dummy; i + = 2) {

    while (! (DCMI-> SR & DCMI_SR_FNE));

    data = DCMI-> DR;

  }

  for (i = 0; i < rcv;) {

    while (! (DCMI-> SR & DCMI_SR_FNE));

    data = DCMI-> DR;

    img [i++] = (uint16_t) data;

    img [i++] = (uint16_t) (data >> 16);

  }

  for (i = 0; i < sz - (rcv + dummy); i + = 2) {

    while (! (DCMI-> SR & DCMI_SR_FNE));

    data = DCMI-> DR;

  }

}

I am calling this:

DCMI_Read (buf, 550 * 1600 100 * 1600 1200 * 1600);

But when I take the data from the camera, the program hangs and does not take the expected amount of data.

In the case of resolution 320x240 (QVGA) no such problem.