File content as of revision 2:bbd557817319:

/*
 * Author: Edoardo De Marchi
 * Date: 10/03/13
 * Notes: OV7670 + FIFO AL422B camera test
*/

#include "main.h"

#define VGA     307200         //640*480
#define QVGA    76800          //320*240
#define QQVGA   19200          //160*120

static char format = ' ';
static int resolution = 0;


void rxCallback(MODSERIAL_IRQ_INFO *q) 
{
     new_send = true;
}

int main() 
{  
    pc.baud(921600);       
    pc.printf("SystemCoreClock: %dMHz\r\n", SystemCoreClock/1000000);       // print the clock frequency
    led4 = 0;
  
    t.start();
    pc.attach(&rxCallback, MODSERIAL::RxIrq);

    while(1) 
    { 
        if(new_send){
            int i = 0;
       
            while(pc.readable())
            {
                word[i] = pc.getc();
                i++;
            }
            parse_cmd(); 
        }            
        wait_ms(50);
    }
}



void parse_cmd(){
            new_send = false;
            
            if(strcmp("snap", word) == 0)              
            {
                    CameraSnap();
                    memset(word, 0, sizeof(word));      
            }else
            if(strcmp("init_bw_VGA", word) == 0)                  // Set up for 640*480 pixels YUV (Only Y)     
            {
                    pc.printf("Initializing ov7670 - Format YUV422(Y only) & VGA Mode\r\n");
                    format = 'b';
                    resolution = VGA;
                    if(camera.Init('b', VGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else  
            if(strcmp("init_yuv_QVGA", word) == 0)                  // Set up for 320*240 pixels YUV422   
            {
                    pc.printf("Initializing ov7670 - Format YUV422 & QVGA Mode\r\n");
                    format = 'y';
                    resolution = QVGA;
                    if(camera.Init('b', QVGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else  
            if(strcmp("init_rgb_QVGA", word) == 0)                  // Set up for 320*240 pixels RGB565   
            {
                    pc.printf("Initializing ov7670 - Format RGB565 & QVGA Mode\r\n");
                    format = 'r';
                    resolution = QVGA;
                    if(camera.Init('r', QVGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else 
            if(strcmp("init_bw_QVGA", word) == 0)                  // Set up for 320*240 pixels YUV (Only Y)         
            {
                    pc.printf("Initializing ov7670 - Format YUV422(Y only) & QVGA Mode\r\n");
                    format = 'b';
                    resolution = QVGA;
                    if(camera.Init('b', QVGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else  
            if(strcmp("init_yuv_QQVGA", word) == 0)                 // Set up for 160*120 pixels YUV422
            {                            
                    pc.printf("Initializing ov7670 - Format YUV422 & QQVGA Mode\r\n");
                    format = 'y';
                    resolution = QQVGA;
                    if(camera.Init('b', QQVGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else   
            if(strcmp("init_rgb_QQVGA", word) == 0)                 // Set up for 160*120 pixels RGB565
            {                            
                    pc.printf("Initializing ov7670 - Format RGB565 & QQVGA Mode\r\n");
                    format = 'r';
                    resolution = QQVGA;
                    if(camera.Init('r', QQVGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else
            if(strcmp("init_bw_QQVGA", word) == 0)                 // Set up for 160*120 pixels YUV (Only Y)
            {                        
                    pc.printf("Initializing ov7670 - Format YUV422(Y only) & QQVGA Mode\r\n");
                    format = 'b';
                    resolution = QQVGA;
                    if(camera.Init('b', QQVGA) != 1)
                    {
                      pc.printf("Init Fail\r\n");
                    }
                    pc.printf("Initializing done\r\n");
                    memset(word, 0, sizeof(word));
            }else
            if(strcmp("reset", word) == 0)              
            {
                    mbed_reset();        
            }else
            if(strcmp("time", word) == 0)              
            {
                    pc.printf("Tot time acq + send (mbed): %dms\r\n", t2-t1);
                    memset(word, 0, sizeof(word));
            }
            
            memset(word, 0, sizeof(word));
            
}


void CameraSnap(){
        led4 = 1;

                // Kick things off by capturing an image
        camera.CaptureNext();
        while(camera.CaptureDone() == false);      
                // Start reading in the image data from the camera hardware buffer                   
        camera.ReadStart();  
        t1 = t.read_ms();
        
        for(int x = 0; x<resolution; x++)
        {
               // Read in the first half of the image
               if(format == 'b')
               {
                    camera.ReadOnebyte();
               }else
               if(format == 'y' || format == 'r')
               {
                    pc.putc(camera.ReadOnebyte());
               }     
               // Read in the Second half of the image
               pc.putc(camera.ReadOnebyte());      // Y only         
        }
       
        camera.ReadStop();
        t2 = t.read_ms();         
        
                 // Immediately request the next image to be captured (takes around 45ms)
        camera.CaptureNext();                             
                // Now wait for the image to finish being captured
        while (camera.CaptureDone() == false);
        
        pc.printf("Snap_done\r\n");   
        led4 = 0;
}