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我最近在调试摄像头ov7670模块输出图像，但是总是有问题。想说一下我的架构。然后在阐释问题。
架构：我是用ATmega16 单片机控制ov7670进行图像采集的，ov7670的模块是买的现成的，就是ov7670+AL422（FIFO）哪个开发板的。采集图像再经过串口发到上位机，用串口调试工具接收到数据之后，用matlab还原（没有找到合适的软件，那位大神有可以推荐一个，小弟不胜感激）。
结果是：当我采用输出八个彩条时是正常的，见图一。 但是当我要输出图像时，就花屏了。具体见图二。我是在是不知道怎么回事了。不知道那位大神能帮小弟解决一下。（对了 我现在的系统是用杜邦线把摄像头连接到单片机系统上的 可能会有部分影响，但应该不是我这个问题的根本原因吧）
附上我的程序吧：
main：
void main(void)
{
//uchar i;
uint i,j,k;
uint m;
uint N=0;
uchar fifo_data;
char data,temp;
CLI();
Board_init( ); //初始化开发板
Uart_init(38400); //初始化串口，设置波特率
//Uart_sentstr("开始\r\n"); //发送字符串
Delayms(40);
init_gpio(); //摄像头IO初始化
fifo_init(); //摄像头FIFO初始化
int0_init(); //外部中断0初始化
Delayms(400);
SEI();
VsyncCnt =0;
DDRB=0x00;
fifo_ready =0;
//Uart_sentstr("第一步…\r\n");//发送字符串
while (1) //ov7670初始化
{
if (OV7670_init())
{
break;
}
}
//Uart_sentstr("第一步完成，第二步……\r\n");//发送字符串
while (1)
{ //Uart_sentstr("\r\n第");Uart_sentstr("N");Uart_sentstr("次\r\n");
if ((fifo_ready==1))
{ //Uart_sendB(2);
//fifo_init();
//PORTA&=~BIT(FIFO_RCLK_BIT);//FIFO_RCLK_BIT=0;
//PORTA&=~BIT(FIFO_OE_BIT);//FIFO_OE_BIT=0;
FIFO_RRST_L; //读指针复位
FIFO_RCLK_L; //至少需要一个时钟周期的跳变才能复位
FIFO_RCLK_H;
FIFO_RCLK_L; //至少需要一个时钟周期的跳变才能复位
FIFO_RCLK_H;
FIFO_RRST_H;
FIFO_OE_L; //必须在读指针复位后使能OE和RE才能从
//0地址读数据,硬件已将OE和RE连在一起
for (i=0;i<240;i++)//120
{
for (j=0;j<320;j++)//160
{
//for(k=0;k<2;k++)
// {
/*PORTA|=BIT(FIFO_RCLK_BIT);//FIFO_RCLK_BIT=1;
;;;;;;;;//for(m=0;m<8;m++) ;//自己添加测试
fifo_data=FIFO_DATA_PIN;
//Uart_sendB(3); //测试
//if(k==0)
// {
/*if(fifo_data>122)
{fifo_data=255;}
else
{fifo_data=0; }//二值化
*/
//fifo_data = (fifo_data & 0xf0);
//if(k==0)
//{
/*Uart_sendB(fifo_data);//发送底八位，灰度值
//}
//}
PORTA&=~BIT(FIFO_RCLK_BIT); //FIFO_RCLK_BIT=0;
;;;;;;;;*/
//delay_us(1000);
FIFO_RCLK_L;
FIFO_RCLK_H;
data = FIFO_DATA_PIN;
//data <<= 8; //先读高位
Uart_sendB(data);
FIFO_RCLK_L;
FIFO_RCLK_H;
temp = FIFO_DATA_PIN;//再读低位
Uart_sendB(temp);
// }
}
}
FIFO_OE_H; //关闭读使能,同时数据口为高阻态
FIFO_WEN_L; //按照手册上说明,复位时WEN要置高,但
FIFO_WRST_L; //MCU的WEN和HREF是做与非逻辑后再输入
NOP(); //到AL422B的,所以MCU的WEN置低则输出
NOP(); //到422的WEN一定为低
NOP(); //写指针复位需要一定的延时
FIFO_WRST_H;
VsyncCnt = 0; //开始下一帧数据采集
//VsyncCnt =0;
GICR|=0b01000000; //开启int0中断
//rec_flag=0;
//while (rec_flag==0);
}
N++;
break;
}
}
我的寄存器设置为：
{0x3a, 0x04},
{0x12, 0x14},
//{0x40, 0xd0},
//RGB555/565 option(must set COM7[2] = 1 and COM7[0] = 0)
{0x40, 0xd0},//RGB565,effective only when RGB444[1] is low
{0x8c, 0x00},
{0x32, 0x80},
{0x17, 0x16},
{0x18, 0x04},
{0x19, 0x02},
{0x1a, 0x7b},//0x7a,
{0x03, 0x06},//0x0a,
{0x0c, 0x00},
{0x3e, 0x00},//PCLK 分频 00 11
{0x6b, 0x0a},//PLL 80 00
{0x70, 0x00},//00
{0x71, 0x00},//0x85测试
//{0x42, 0x08},
{0x72, 0x11},
{0x73, 0x00},//pclk 设置 00 01
{0xa2, 0x02},
{0x11, 0x80},//clkrc 内部时钟80
{0x7a, 0x20},
{0x7b, 0x1c},
{0x7c, 0x28},
{0x7d, 0x3c},
{0x7e, 0x55},
{0x7f, 0x68},
{0x80, 0x76},
{0x81, 0x80},
{0x82, 0x88},
{0x83, 0x8f},
{0x84, 0x96},
{0x85, 0xa3},
{0x86, 0xaf},
{0x87, 0xc4},
{0x88, 0xd7},
{0x89, 0xe8},
{0x13, 0xe0},
{0x00, 0x00},//AGC
{0x10, 0x00},
{0x0d, 0x00},
{0x14, 0x20},//0x38, limit the max gain
{0xa5, 0x05},
{0xab, 0x07},
{0x24, 0x75},
{0x25, 0x63},
{0x26, 0xA5},
{0x9f, 0x78},
{0xa0, 0x68},
{0xa1, 0x03},//0x0b,
{0xa6, 0xdf},//0xd8,
{0xa7, 0xdf},//0xd8,
{0xa8, 0xf0},
{0xa9, 0x90},
{0xaa, 0x94},
{0x13, 0xe5},
{0x0e, 0x61},
{0x0f, 0x4b},
{0x16, 0x02},
{0x1e, 0x37},//0x07,
{0x21, 0x02},
{0x22, 0x91},
{0x29, 0x07},
{0x33, 0x0b},
{0x35, 0x0b},
{0x37, 0x1d},
{0x38, 0x71},
{0x39, 0x2a},//
{0x3c, 0x78},
{0x4d, 0x40},
{0x4e, 0x20},
{0x69, 0x0c},///////////////////////
{0x74, 0x19},
{0x8d, 0x4f},
{0x8e, 0x00},
{0x8f, 0x00},
{0x90, 0x00},
{0x91, 0x00},
{0x92, 0x00},//0x19,//0x66
{0x96, 0x00},
{0x9a, 0x80},
{0xb0, 0x84},
{0xb1, 0x0c},
{0xb2, 0x0e},
{0xb3, 0x82},
{0xb8, 0x0a},
{0x43, 0x14},
{0x44, 0xf0},
{0x45, 0x34},
{0x46, 0x58},
{0x47, 0x28},
{0x48, 0x3a},
{0x59, 0x88},
{0x5a, 0x88},
{0x5b, 0x44},
{0x5c, 0x67},
{0x5d, 0x49},
{0x5e, 0x0e},
{0x64, 0x04},
{0x65, 0x20},
{0x66, 0x05},
{0x94, 0x04},
{0x95, 0x08},
{0x6c, 0x0a},
{0x6d, 0x55},
{0x6e, 0x11},
{0x6f, 0x9f},//0x9e for advance AWB
{0x6a, 0x00},
{0x01, 0x80},
{0x02, 0x80},
{0x13, 0xe7},
{0x15, 0x02},//
{0x4f, 0x80},
{0x50, 0x80},
{0x51, 0x00},
{0x52, 0x22},
{0x53, 0x5e},
{0x54, 0x80},
{0x58, 0x9e},
{0x41, 0x08},
{0x3f, 0x00},
{0x75, 0x05},
{0x76, 0xe1},
{0x4c, 0x00},
{0x77, 0x01},
{0x3d, 0xc2}, //0xc0,
{0x4b, 0x09},
{0xc9, 0x60},
{0x41, 0x38},
{0x56, 0x40},//0x40, change according to Jim's request
{0x34, 0x11},
{0x3b, 0x02},//0x00,//0x02,
{0xa4, 0x89},//0x88,
{0x96, 0x00},
{0x97, 0x30},
{0x98, 0x20},
{0x99, 0x30},
{0x9a, 0x84},
{0x9b, 0x29},
{0x9c, 0x03},
{0x9d, 0x4c},
{0x9e, 0x3f},
{0x78, 0x04},
{0x79, 0x01},
{0xc8, 0xf0},
{0x79, 0x0f},
{0xc8, 0x00},
{0x79, 0x10},
{0xc8, 0x7e},
{0x79, 0x0a},
{0xc8, 0x80},
{0x79, 0x0b},
{0xc8, 0x01},
{0x79, 0x0c},
{0xc8, 0x0f},
{0x79, 0x0d},
{0xc8, 0x20},
{0x79, 0x09},
{0xc8, 0x80},
{0x79, 0x02},
{0xc8, 0xc0},
{0x79, 0x03},
{0xc8, 0x40},
{0x79, 0x05},
{0xc8, 0x30},
{0x79, 0x26},
{0x09, 0x03},
{0x55, 0x00},
{0x56, 0x40},
{0x3b, 0xC2},//0x82,//0xc0,//0xc2, //night mode
其他的程序是采用现成的，所以应该没有什么问题。
真心求解啊！！！！！！！！！！！！！！！！！！！！！！ |
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发表于 2013-1-30 18:40:20
楼主