STM32 OV7670 液晶

0v7670窗口显示异常

2019-12-27 19:04发布

站内问答 / STM32/STM8
4351 19 19
在320X240的液晶上显示qvga，一切正常。打算让摄像头显示在窗口280X200，怎么都是错位。
void OV_HW(unsigned int  hstart, unsigned int hstop, unsigned int vstart, unsigned int vstop)
{
    uint8_t v;
    OV7670_WriteReg(0x17, (hstart >> 3) & 0xff); //HSTART
    OV7670_WriteReg(0x18, (hstop >> 3) & 0xff); //HSTOP
    OV7670_ReadReg(0x32,&v);
    v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x7);
    OV7670_WriteReg(0x32, v); //HREF

    OV7670_WriteReg(0x19, (vstart >> 2) & 0xff); //VSTART 开始高8位
    OV7670_WriteReg(0x1a, (vstop >> 2) & 0xff); //VSTOP        结束高8位
     OV7670_ReadReg(0x03,&v );
    v = (v & 0xf0) | ((vstop & 0x3) << 2) | (vstart & 0x3);
   OV7670_WriteReg(0x03, v); //VREF
    OV7670_WriteReg(0x11, 0x00);
}
19条回答
heitu103
2019-12-28 00:30 .采纳回答
给个参考，亲测可用

  1. //输出窗口设置
  2. void OV7670_config_window(u16 startx,u16 starty,u16 width,u16 height)
  3. {
  4.     u16 endx=(startx+width)%784;   //QVGA输出的话改成 u16 endx=(startx+width*2)%784;   
  5.     u16 endy=(starty+height);            // u16 endy=(starty+height*2);

  7.      u8 x_reg,y_reg;
  8.      u8 state,temp;
  9.      state=ov7660_read_reg(0x32,&x_reg);
  10.     x_reg&=0xC0;
  11.     state=ov7660_read_reg(0x03,&y_reg);
  12.     y_reg&=0xF0;
  13.                
  14.     //HREF
  15.     temp=x_reg|((endx&0x7)<<3)|(startx&0x7);
  16.     state=ov7670_write_reg(0x32,temp);
  17.     temp=(startx&0x7F8)>>3;
  18.      state=ov7670_write_reg(0x17,temp);
  19.      temp=(endx&0x7F8)>>3;
  20.       state=ov7670_write_reg(0x18,temp);
  21.                
  22.     //VREF
  23.      temp=y_reg|((endy&0x3)<<2)|(starty&0x3);
  24.      state=ov7670_write_reg(0x03,temp);
  25.      temp=(starty&0x3FC)>>2;
  26.     state=ov7670_write_reg(0x19,temp);
  27.      temp=(endy&0x3FC)>>2;
  28.      state=ov7670_write_reg(0x1A,temp);
  29. }
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