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标题: ov6620采集问题 [打印本页]

作者: sprint 时间: 2009-4-29 18:26
标题: ov6620采集问题
我用OV6620才40行图像但是从第10行以后数据就不准了  会出现小于16的值前10行采集完全正确黑线的值为16-17.哪位高手帮我分析下！
部分代码：
uint r_line[40]@0x2f00=
{2,9,16,23,30,37,44,51,58,65,72,79,86,93,100,107,114,121,128,135,142,149,
156,163,170,177,184,191,198,205,212,219,226,233,240,247,254,261,268,275
};

#pragma CODE_SEG NON_BANKED
void interrupt 13 HREF_ISR(void)
{
DisableInterrupts;
TFLG1_C5F=1;
sample_flag+=1;
if(sample_flag>280)
{
   VSYNC_sample=1;
   TIE_C5I=0;
   return;
}
if(sample_flag==r_line[row]&&HREF_sample==0)
{
   asm
{
   movb PORTA,IMAGE_BUFF
   movb PORTA,IMAGE_BUFF+1
   movb PORTA,IMAGE_BUFF+2
   movb PORTA,IMAGE_BUFF+3
   movb PORTA,IMAGE_BUFF+4
   movb PORTA,IMAGE_BUFF+5
   movb PORTA,IMAGE_BUFF+6
   movb PORTA,IMAGE_BUFF+7
   movb PORTA,IMAGE_BUFF+8
   movb PORTA,IMAGE_BUFF+9
   movb PORTA,IMAGE_BUFF+10
   movb PORTA,IMAGE_BUFF+11
   movb PORTA,IMAGE_BUFF+12
   movb PORTA,IMAGE_BUFF+13
   movb PORTA,IMAGE_BUFF+14
   movb PORTA,IMAGE_BUFF+15
   movb PORTA,IMAGE_BUFF+16
   movb PORTA,IMAGE_BUFF+17
   movb PORTA,IMAGE_BUFF+18
   movb PORTA,IMAGE_BUFF+19
   movb PORTA,IMAGE_BUFF+20
   movb PORTA,IMAGE_BUFF+21
   movb PORTA,IMAGE_BUFF+22
   movb PORTA,IMAGE_BUFF+23
   movb PORTA,IMAGE_BUFF+24
   movb PORTA,IMAGE_BUFF+25
   movb PORTA,IMAGE_BUFF+26
   movb PORTA,IMAGE_BUFF+27
   movb PORTA,IMAGE_BUFF+28
   movb PORTA,IMAGE_BUFF+29
   movb PORTA,IMAGE_BUFF+30
   movb PORTA,IMAGE_BUFF+31
   movb PORTA,IMAGE_BUFF+32
   movb PORTA,IMAGE_BUFF+33
   movb PORTA,IMAGE_BUFF+34
   movb PORTA,IMAGE_BUFF+35
   movb PORTA,IMAGE_BUFF+36
   movb PORTA,IMAGE_BUFF+37
   movb PORTA,IMAGE_BUFF+38
   movb PORTA,IMAGE_BUFF+39
   movb PORTA,IMAGE_BUFF+40
   movb PORTA,IMAGE_BUFF+41
   movb PORTA,IMAGE_BUFF+42
   movb PORTA,IMAGE_BUFF+43
   movb PORTA,IMAGE_BUFF+44
   movb PORTA,IMAGE_BUFF+45
   movb PORTA,IMAGE_BUFF+46
   movb PORTA,IMAGE_BUFF+47
   movb PORTA,IMAGE_BUFF+48
   movb PORTA,IMAGE_BUFF+49
   movb PORTA,IMAGE_BUFF+50
   movb PORTA,IMAGE_BUFF+51
   movb PORTA,IMAGE_BUFF+52
   movb PORTA,IMAGE_BUFF+53
   movb PORTA,IMAGE_BUFF+54
   movb PORTA,IMAGE_BUFF+55
   movb PORTA,IMAGE_BUFF+56
   movb PORTA,IMAGE_BUFF+57
   movb PORTA,IMAGE_BUFF+58
   movb PORTA,IMAGE_BUFF+59
   movb PORTA,IMAGE_BUFF+60
   movb PORTA,IMAGE_BUFF+61
   movb PORTA,IMAGE_BUFF+62
   movb PORTA,IMAGE_BUFF+63
   movb PORTA,IMAGE_BUFF+64
   movb PORTA,IMAGE_BUFF+65
   movb PORTA,IMAGE_BUFF+66
   movb PORTA,IMAGE_BUFF+67
   movb PORTA,IMAGE_BUFF+68
   movb PORTA,IMAGE_BUFF+69
   movb PORTA,IMAGE_BUFF+70
   movb PORTA,IMAGE_BUFF+71
   movb PORTA,IMAGE_BUFF+72
   movb PORTA,IMAGE_BUFF+73
   movb PORTA,IMAGE_BUFF+74
   movb PORTA,IMAGE_BUFF+75
   movb PORTA,IMAGE_BUFF+76
   movb PORTA,IMAGE_BUFF+77
   movb PORTA,IMAGE_BUFF+78
   movb PORTA,IMAGE_BUFF+79
   movb PORTA,IMAGE_BUFF+80
   movb PORTA,IMAGE_BUFF+81
   movb PORTA,IMAGE_BUFF+82
   movb PORTA,IMAGE_BUFF+83
   movb PORTA,IMAGE_BUFF+84
   movb PORTA,IMAGE_BUFF+85
   movb PORTA,IMAGE_BUFF+86
   movb PORTA,IMAGE_BUFF+87
   movb PORTA,IMAGE_BUFF+88
   movb PORTA,IMAGE_BUFF+89
   movb PORTA,IMAGE_BUFF+90
   movb PORTA,IMAGE_BUFF+91
   movb PORTA,IMAGE_BUFF+92
   movb PORTA,IMAGE_BUFF+93
   movb PORTA,IMAGE_BUFF+94
   movb PORTA,IMAGE_BUFF+95
   movb PORTA,IMAGE_BUFF+96
   movb PORTA,IMAGE_BUFF+97
   movb PORTA,IMAGE_BUFF+98
   movb PORTA,IMAGE_BUFF+99
   movb PORTA,IMAGE_BUFF+100
   movb PORTA,IMAGE_BUFF+101
   movb PORTA,IMAGE_BUFF+102
   movb PORTA,IMAGE_BUFF+103
   movb PORTA,IMAGE_BUFF+104
   movb PORTA,IMAGE_BUFF+105
   movb PORTA,IMAGE_BUFF+106
   movb PORTA,IMAGE_BUFF+107
   movb PORTA,IMAGE_BUFF+108
   movb PORTA,IMAGE_BUFF+109
   movb PORTA,IMAGE_BUFF+110
   movb PORTA,IMAGE_BUFF+111
   movb PORTA,IMAGE_BUFF+112
   movb PORTA,IMAGE_BUFF+113
   movb PORTA,IMAGE_BUFF+114
   movb PORTA,IMAGE_BUFF+115
   movb PORTA,IMAGE_BUFF+116
   movb PORTA,IMAGE_BUFF+117
   movb PORTA,IMAGE_BUFF+118
   movb PORTA,IMAGE_BUFF+119
   movb PORTA,IMAGE_BUFF+120
   movb PORTA,IMAGE_BUFF+121
   movb PORTA,IMAGE_BUFF+122
   movb PORTA,IMAGE_BUFF+123
   movb PORTA,IMAGE_BUFF+124
   movb PORTA,IMAGE_BUFF+125
   movb PORTA,IMAGE_BUFF+126
   movb PORTA,IMAGE_BUFF+127
   movb PORTA,IMAGE_BUFF+128
   movb PORTA,IMAGE_BUFF+129
   movb PORTA,IMAGE_BUFF+130
   movb PORTA,IMAGE_BUFF+131
   movb PORTA,IMAGE_BUFF+132
   movb PORTA,IMAGE_BUFF+133
   movb PORTA,IMAGE_BUFF+134
   movb PORTA,IMAGE_BUFF+135
   movb PORTA,IMAGE_BUFF+136
   movb PORTA,IMAGE_BUFF+137
   movb PORTA,IMAGE_BUFF+138
   movb PORTA,IMAGE_BUFF+139
   movb PORTA,IMAGE_BUFF+140
   movb PORTA,IMAGE_BUFF+141
   movb PORTA,IMAGE_BUFF+142
   movb PORTA,IMAGE_BUFF+143
   movb PORTA,IMAGE_BUFF+144
   movb PORTA,IMAGE_BUFF+145
   movb PORTA,IMAGE_BUFF+146
   movb PORTA,IMAGE_BUFF+147
   }
   HREF_sample=1;
   row++;
}
EnableInterrupts;
}

作者: 03040218 时间: 2009-4-30 08:05
本帖最后由 03040218 于 2009-4-30 08:07 编辑

你用这种方式写代码第一就是要保证行信号的完整性
不要采错了行
你最好用示波器看下你的采集时间
不建议这种方法来写
16 17 应该都是错误的数据
建议你看下手册先

作者: sprint 时间: 2009-4-30 09:48
请教下用哪种方式写比较好？

作者: whut_wj 时间: 2009-4-30 12:57
每个人用的摄像头数据都调过SCCB,不能一概而论这样的数据对不对.
主要看数据是否稳定,是否黑白分明.
当然,不排除硬件的问题,这种可能性很小.
采点注意四个原则即可:
PCLK的有效时间是高电平阶段,行中断上升沿触发,场中降沿触发.行周期里的高电平有效.

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