tekker / esp32-ov7670-hacking Goto Github PK

ov7670_sine() in ov7670.c line 657
should be for correct results:

      theta = 180 - theta;
      sine = ov7670_sin_table[theta / SIN_STEP];

ov7670_calc_cmatrix() line 701

void ov7670_calc_cmatrix( ov7670_info_t *info, int *matrix )
{
   int i;
   int tmp_matrix[CMATRIX_LEN];  // <----------------

   // Apply the current saturation setting first.
   // | 1    0    0  |   |            |   |                        |
   // |              |   |            |   |                        |
   // | 0   sat   0  | * | M0  M1  M2 | = | sat*M0  sat*M1  sat*M2 |
   // |              |   |            |   |                        |
   // | 0    0   sat |   | M3  M4  M5 |   | sat*M3  sat*M4  sat*M5 |

   for( i = 0; i < CMATRIX_LEN; i++ )
      tmp_matrix[i] = ( info->sat * info->cmatrix[i] ) >> 7;

   // Then, if need be, rotate the hue value.
   if( info->hue != 0 )
   {
      int sinth, costh;

      sinth = ov7670_sine( info->hue );
      costh = ov7670_cosine( info->hue );

      // | 1    0     0  |   |            |   |                                             |
      // |               |   |            |   |                                             |
      // | 0   cos   sin | * | M0  M1  M2 | = | cos*M0+sin*M3  cos*M1+sin*M4  cos*M2+sin*M5 |
      // |               |   |            |   |                                             |
      // | 0  -sin   cos |   | M3  M4  M5 |   | cos*M3-sin*M0  cos*M4-sin*M1  cos*M5-sin*M2 |

      matrix[0] = ( ( costh * tmp_matrix[0] ) + ( sinth * tmp_matrix[3] ) ) / 1000;
      matrix[1] = ( ( costh * tmp_matrix[1] ) + ( sinth * tmp_matrix[4] ) ) / 1000;
      matrix[2] = ( ( costh * tmp_matrix[2] ) + ( sinth * tmp_matrix[5] ) ) / 1000;
      matrix[3] = ( ( costh * tmp_matrix[3] ) - ( sinth * tmp_matrix[0] ) ) / 1000;
      matrix[4] = ( ( costh * tmp_matrix[4] ) - ( sinth * tmp_matrix[1] ) ) / 1000;
      matrix[5] = ( ( costh * tmp_matrix[5] ) - ( sinth * tmp_matrix[2] ) ) / 1000;
   }
   else
   {
      for( i = 0; i < CMATRIX_LEN; i++ )
         matrix[i] = tmp_matrix[i];
   }
}

Viele Gruesse
Axel

Hi,
Do you think that is it possible to play a small video (~10 seconds) from RAM using the basic concepts of your code?

The idea is to read the video from flash or sd, copy it to RAM and then use DMA.

Thanks!

@tekker Hi, tekker, I have a NodeMCU-32S based on ESP32 and an OV7670 camera. I am using the newest ESP-IDF , all compiles cleanly and when I flash/run, the log shows: DisplayBuffer is null!!(in camera.c), unless i change currFbPtr=pvPortMallocCaps(3202402, MALLOC_CAP_32BIT); (in app_main.c) to currFbPtr=pvPortMallocCaps(1601202, MALLOC_CAP_32BIT);

and i add some codes to make a test:
size_t free8start=0, free32start=0, free8=0, free32=0;

free32=heap_caps_get_largest_free_block(MALLOC_CAP_32BIT);
free8=heap_caps_get_largest_free_block(MALLOC_CAP_8BIT);
free8start=heap_caps_get_minimum_free_size(MALLOC_CAP_8BIT);
free32start=heap_caps_get_minimum_free_size(MALLOC_CAP_32BIT);

ESP_LOGI(TAG, "Free (largest free blocks) 8bit-capable memory : %d, 32-bit capable memory %d\n", free8, free32);
ESP_LOGI(TAG, "Free (min free size) 8bit-capable memory : %d, 32-bit capable memory %d\n", free8start, free32start);

it print:
Free (largest free blocks) 8bit-capable memory : 144272, 32-bit capable memory 144272
Free (min free size) 8bit-capable memory : 272396, 32-bit capable memory 338868

i think it's
3202402=153600>144272 that make pvPortMallocCaps(3202402, MALLOC_CAP_32BIT) return NULL

Have you meet this issues?

Hello Tekker, I have been following this post since igrr's original post on the camera and the esp32. I was massively delighted to see you have been able to get the ov7670 working with the esp32. I am looking to view the images through a webpage served up by the esp instead of a display. If you can point me to the variables that contain the image data or where it is stored, I would love to work on achieving this. I have been looking through the code but am still unsure as to where the actual image data is stored. Would you be willing to help me out? I am pursuing this for a larger project that I am working on. Thank you for your work already.

I'm having trouble getting my OV7670 (without FIFO) camera to work with my LOLIN32 board.
It's always returning 0 when I run SCCB_Probe()

My connections are:

Everything else is floating.

I can confirm a 10 MHZ signal on XCLK, and I can see some other frequencies on the PCLK, HREF and VSYNC pins.

I moved the code into a standalone program to attempt to debug, but I cant seem to get it to work.
The code is here: https://gist.github.com/mic159/c80494c7be5034150e29d21b0388d5a6

Is there something obvious I'm doing wrong, or is my module broken?

Hi

I tried replacing the CAMERA_PF_RGB565 with CAMERA_PF_GRAYSCALE to start getting grayscale images from the OV7670 but keep on running into LoadStoreError.

I uncommented the necessary lines and the LoadStoreError triggers here :
branch : framebuffer_overlay
file : camera.c
line 911 : dst[0] = src[0].sample1;

From here : https://github.com/SuperHouse/esp-open-rtos/wiki/Crash-Dumps
I find that it is likely because of trying to access a byte or word in a manner not allowed.

@tekker @igrr Did you manage to get grayscale mode to work with this branch ?
Any pointers are appreciated!

Hi @tekker thanks for the awesome work, it provided me a lot of fun!

This is a noobish request, I got myselft an ESP32-Wrover-Kit v3 and have some free time over the weekends to test and play with it.
Feel free to close this request if you find this is inappropriate.

I've ordered a couple of OV7670 cam modules to play with the Wrover Kit, and so far I managed to get a few snapshots using the feature-rgb_bitmap branch of this project.

I also attempted to modify the ov7670_ili9341 branch to get it working with the LCD bundled with my v3 Dev Kit (an ST7789V).
I found a driver implementation (IoTuz has support for ST7789v) and built this init code:

DRAM_ATTR static const ili_init_cmd_t ili_init_cmds[]={
    {0x36, {0}, 1},
    {0x3A, {0x55}, 1},
    {0xB2, {0x0C,0x0C,0x00,0x33,0x33}, 5},
    {0xB7, {0x35}, 1},
    {0xBB, {0x2B}, 1},
    {0xC0, {0x2C}, 1},
    {0xC2, {0x01,0xFF}, 2},
    {0xC3, {0x11}, 1},
    {0xC4, {0x20}, 1},
    {0xC6, {0x0F}, 1},
    {0xD0, {0xA4,0xA1}, 2},
    {0xE0, {0xD0,0x00,0x05,0x0E,0x15,0x0D,0x37,0x43,0x47,0x09,0x15,0x12,0x16,0x19}, 14},
    {0xE1, {0xD0,0x00,0x05,0x0D,0x0C,0x06,0x2D,0x44,0x40,0x0E,0x1C,0x18,0x16,0x19}, 14},
    {0x11, {0}, 0x80}, // optional
    {0x29, {0}, 0x80}, // optional
    {0, {0}, 0xff},
};

Obviously, modifying only this is not enough and I wonder if and where would be some other ili9341-specific code that also need to be adapted.

Detected overlap at address: 0x8000 for file: /Volumes/ESP32/esp-idf-v3.1/examples/esp32-cam-demo/build/partitions_singleapp.bin

compile success.but flashing failed.