Joseph Bradshaw / uCAM_TTL120

mbed serial interface for the OV528 camera (uCAM TTL 120 from 4D systems).

Dependencies:   MODSERIAL

Dependents:   mbed_uCAM_TTL120_20141118

Library for interfacing the mbed to the OV528 jpeg engine camera from Omnivision. I tested this program using the uCAM TTL 120 from 4D systems, now obsolete.

/media/uploads/jebradshaw/pic0003.jpg

Above is a saved jpeg image from the camera at 480x640 resolution

/media/uploads/jebradshaw/fullsizerender.jpg

Camera and TFT screen setup

/media/uploads/jebradshaw/tft_closeup_60x80.jpg

Closeup of the TFT screen displaying a 60x80 pixel 16 bit color bitmap image. The RGB (565) pixel colors were reversed when read from the camera relative to the TFT screen so a bit mask and shift had to be applied when displaying the pixel color.

bit mask and shift

         int k=12;
         for(int i=0;i<60;i++){
                for(int j=0;j<80;j++){                    
                    //returned 16-bit color is 565(RGB)
                     pixel_col = (imageData[k] << 8);
                     k++;                       
                     pixel_col += imageData[k];
                     k++;
//                 fputc(((picture[k] >> 8) & 0xff), fp);     //write pixel high byte to file 
//                 fputc(picture[k] & 0xff, fp);                 //write low byte
                                        
                //swap R and B bits in returned pixel for TFT display
                int TFT_pix_col = 0;
                TFT_pix_col += (pixel_col & 0x001f) << 11;
                TFT_pix_col += (pixel_col & 0xf800) >> 11;
                TFT_pix_col += (pixel_col & 0x07e0);
                                        
                 TFT.pixel(j, i, TFT_pix_col);  //Do something with the pixel
                }
             }