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arduino nano调试OV7670拍照 参照帖子一定成功

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发表于 2017-8-30 08:50:54 | 显示全部楼层 |阅读模式
       我是悟空学堂张老师,最近一直忙开学的事情,昨晚终于抽出了一点时间,把ov7670与arduino nano的连接测试重新整理了一遍。以为我们一直从事光学捕捉方面的项目研发,所以对单片机摄像头的应用都会有点涉入,最早调试0v7670的时候,发现这个摄像头无法满足我们在arduino单片机上高帧速捕捉的要求,所以后面就放弃了,毕竟arduino运算能力有限,前几天在极客工坊上搜相关帖子,想了解有没有全新突破,发现能调通的还不多,帖子很多是求助贴,所以花了点时间,把ov7670重新弄出来,擦了灰,连上了arduino nano。我手上有带fifo和不带fifo的两种,以为连线太负杂,就只用来不带fifo的板子,最重要的原因是吃灰的ov7670还带着插线,我就不用去找线了。
       这次调试,用到的材料为:
       1、arduino nano一个
       2、ov7670不带fifo一个   特别注意,电压使用为3.3v,电压为3.3v,电压为3.3v
       3、插线,一端排母,一端排针的那种,18根
       4、10k电阻  2个
       5、4.7k电阻   2个
       6、洞洞板一块

        整个连接效果图:
         未标题-1.jpg
        
       接线图说明:
       ov7670takepicture.jpg
       程序烧录用的代码:
      代码说明,此代码为github上代码,是ardnuino采集后通过usb串口传入电脑,然后电脑端进行接收解码成图片进行显示

//wukongxuetang teacher zhang
// Source code for application to transmit image from ov7670 to PC via USB
// By Siarhei Charkes in 2015
// http://privateblog.info

#include <stdint.h>
#include <avr/io.h>
#include <util/twi.h>
#include <util/delay.h>
#include <avr/pgmspace.h>

#define F_CPU 16000000UL
#define vga   0
#define qvga  1
#define qqvga   2
#define yuv422  0
#define rgb565  1
#define bayerRGB  2
#define camAddr_WR  0x42
#define camAddr_RD  0x43

/* Registers */
#define REG_GAIN    0x00  /* Gain lower 8 bits (rest in vref) */
#define REG_BLUE    0x01  /* blue gain */
#define REG_RED       0x02  /* red gain */
#define REG_VREF    0x03  /* Pieces of GAIN, VSTART, VSTOP */
#define REG_COM1    0x04  /* Control 1 */
#define COM1_CCIR656  0x40    /* CCIR656 enable */

#define REG_BAVE    0x05  /* U/B Average level */
#define REG_GbAVE   0x06  /* Y/Gb Average level */
#define REG_AECHH   0x07  /* AEC MS 5 bits */
#define REG_RAVE    0x08  /* V/R Average level */
#define REG_COM2    0x09  /* Control 2 */
#define COM2_SSLEEP         0x10  /* Soft sleep mode */
#define REG_PID           0x0a  /* Product ID MSB */
#define REG_VER           0x0b  /* Product ID LSB */
#define REG_COM3    0x0c  /* Control 3 */
#define COM3_SWAP         0x40  /* Byte swap */
#define COM3_SCALEEN          0x08  /* Enable scaling */
#define COM3_DCWEN          0x04  /* Enable downsamp/crop/window */
#define REG_COM4    0x0d  /* Control 4 */
#define REG_COM5    0x0e  /* All "reserved" */
#define REG_COM6    0x0f  /* Control 6 */
#define REG_AECH    0x10  /* More bits of AEC value */
#define REG_CLKRC   0x11  /* Clocl control */
#define CLK_EXT           0x40  /* Use external clock directly */
#define CLK_SCALE   0x3f  /* Mask for internal clock scale */
#define REG_COM7    0x12  /* Control 7 */ //REG mean address.
#define COM7_RESET          0x80  /* Register reset */
#define COM7_FMT_MASK         0x38
#define COM7_FMT_VGA          0x00
#define COM7_FMT_CIF          0x20  /* CIF format */
#define COM7_FMT_QVGA         0x10  /* QVGA format */
#define COM7_FMT_QCIF         0x08  /* QCIF format */
#define COM7_RGB          0x04  /* bits 0 and 2 - RGB format */
#define COM7_YUV          0x00  /* YUV */
#define COM7_BAYER          0x01  /* Bayer format */
#define COM7_PBAYER         0x05  /* "rocessed bayer" */
#define REG_COM8    0x13  /* Control 8 */
#define COM8_FASTAEC          0x80  /* Enable fast AGC/AEC */
#define COM8_AECSTEP          0x40  /* Unlimited AEC step size */
#define COM8_BFILT    0x20  /* Band filter enable */
#define COM8_AGC    0x04  /* Auto gain enable */
#define COM8_AWB    0x02  /* White balance enable */
#define COM8_AEC    0x01  /* Auto exposure enable */
#define REG_COM9    0x14  /* Control 9- gain ceiling */
#define REG_COM10   0x15  /* Control 10 */
#define COM10_HSYNC         0x40  /* HSYNC instead of HREF */
#define COM10_PCLK_HB         0x20  /* Suppress PCLK on horiz blank */
#define COM10_HREF_REV          0x08  /* Reverse HREF */
#define COM10_VS_LEAD         0x04  /* VSYNC on clock leading edge */
#define COM10_VS_NEG          0x02  /* VSYNC negative */
#define COM10_HS_NEG          0x01  /* HSYNC negative */
#define REG_HSTART    0x17  /* Horiz start high bits */
#define REG_HSTOP   0x18  /* Horiz stop high bits */
#define REG_VSTART    0x19  /* Vert start high bits */
#define REG_VSTOP   0x1a  /* Vert stop high bits */
#define REG_PSHFT   0x1b  /* Pixel delay after HREF */
#define REG_MIDH    0x1c  /* Manuf. ID high */
#define REG_MIDL    0x1d  /* Manuf. ID low */
#define REG_MVFP    0x1e  /* Mirror / vflip */
#define MVFP_MIRROR         0x20  /* Mirror image */
#define MVFP_FLIP   0x10  /* Vertical flip */

#define REG_AEW           0x24  /* AGC upper limit */
#define REG_AEB           0x25    /* AGC lower limit */
#define REG_VPT           0x26  /* AGC/AEC fast mode op region */
#define REG_HSYST   0x30  /* HSYNC rising edge delay */
#define REG_HSYEN   0x31  /* HSYNC falling edge delay */
#define REG_HREF    0x32  /* HREF pieces */
#define REG_TSLB    0x3a  /* lots of stuff */
#define TSLB_YLAST    0x04  /* UYVY or VYUY - see com13 */
#define REG_COM11   0x3b  /* Control 11 */
#define COM11_NIGHT         0x80  /* NIght mode enable */
#define COM11_NMFR          0x60  /* Two bit NM frame rate */
#define COM11_HZAUTO          0x10  /* Auto detect 50/60 Hz */
#define COM11_50HZ          0x08  /* Manual 50Hz select */
#define COM11_EXP   0x02
#define REG_COM12   0x3c  /* Control 12 */
#define COM12_HREF          0x80  /* HREF always */
#define REG_COM13   0x3d  /* Control 13 */
#define COM13_GAMMA         0x80  /* Gamma enable */
#define COM13_UVSAT         0x40  /* UV saturation auto adjustment */
#define COM13_UVSWAP          0x01  /* V before U - w/TSLB */
#define REG_COM14   0x3e  /* Control 14 */
#define COM14_DCWEN         0x10  /* DCW/PCLK-scale enable */
#define REG_EDGE    0x3f  /* Edge enhancement factor */
#define REG_COM15   0x40  /* Control 15 */
#define COM15_R10F0         0x00  /* Data range 10 to F0 */
#define COM15_R01FE         0x80  /*      01 to FE */
#define COM15_R00FF         0xc0  /*      00 to FF */
#define COM15_RGB565          0x10  /* RGB565 output */
#define COM15_RGB555          0x30  /* RGB555 output */
#define REG_COM16   0x41  /* Control 16 */
#define COM16_AWBGAIN         0x08  /* AWB gain enable */
#define REG_COM17   0x42  /* Control 17 */
#define COM17_AECWIN          0xc0  /* AEC window - must match COM4 */
#define COM17_CBAR          0x08  /* DSP Color bar */
/*
* This matrix defines how the colors are generated, must be
* tweaked to adjust hue and saturation.
*
* Order: v-red, v-green, v-blue, u-red, u-green, u-blue
* They are nine-bit signed quantities, with the sign bit
* stored in0x58.Sign for v-red is bit 0, and up from there.
*/
#define REG_CMATRIX_BASE  0x4f
#define CMATRIX_LEN           6
#define REG_CMATRIX_SIGN  0x58
#define REG_BRIGHT    0x55  /* Brightness */
#define REG_CONTRAS         0x56  /* Contrast control */
#define REG_GFIX    0x69  /* Fix gain control */
#define REG_REG76   0x76  /* OV's name */
#define R76_BLKPCOR         0x80  /* Black pixel correction enable */
#define R76_WHTPCOR         0x40  /* White pixel correction enable */
#define REG_RGB444          0x8c  /* RGB 444 control */
#define R444_ENABLE         0x02  /* Turn on RGB444, overrides 5x5 */
#define R444_RGBX   0x01  /* Empty nibble at end */
#define REG_HAECC1    0x9f  /* Hist AEC/AGC control 1 */
#define REG_HAECC2    0xa0  /* Hist AEC/AGC control 2 */
#define REG_BD50MAX         0xa5  /* 50hz banding step limit */
#define REG_HAECC3    0xa6  /* Hist AEC/AGC control 3 */
#define REG_HAECC4    0xa7  /* Hist AEC/AGC control 4 */
#define REG_HAECC5    0xa8  /* Hist AEC/AGC control 5 */
#define REG_HAECC6    0xa9  /* Hist AEC/AGC control 6 */
#define REG_HAECC7    0xaa  /* Hist AEC/AGC control 7 */
#define REG_BD60MAX         0xab  /* 60hz banding step limit */
#define REG_GAIN    0x00  /* Gain lower 8 bits (rest in vref) */
#define REG_BLUE    0x01  /* blue gain */
#define REG_RED           0x02  /* red gain */
#define REG_VREF    0x03  /* Pieces of GAIN, VSTART, VSTOP */
#define REG_COM1    0x04  /* Control 1 */
#define COM1_CCIR656          0x40  /* CCIR656 enable */
#define REG_BAVE    0x05  /* U/B Average level */
#define REG_GbAVE   0x06  /* Y/Gb Average level */
#define REG_AECHH   0x07  /* AEC MS 5 bits */
#define REG_RAVE    0x08  /* V/R Average level */
#define REG_COM2    0x09  /* Control 2 */
#define COM2_SSLEEP         0x10  /* Soft sleep mode */
#define REG_PID           0x0a  /* Product ID MSB */
#define REG_VER           0x0b  /* Product ID LSB */
#define REG_COM3    0x0c  /* Control 3 */
#define COM3_SWAP         0x40  /* Byte swap */
#define COM3_SCALEEN          0x08  /* Enable scaling */
#define COM3_DCWEN          0x04  /* Enable downsamp/crop/window */
#define REG_COM4    0x0d  /* Control 4 */
#define REG_COM5    0x0e  /* All "reserved" */
#define REG_COM6    0x0f  /* Control 6 */
#define REG_AECH    0x10  /* More bits of AEC value */
#define REG_CLKRC   0x11  /* Clocl control */
#define CLK_EXT           0x40  /* Use external clock directly */
#define CLK_SCALE   0x3f  /* Mask for internal clock scale */
#define REG_COM7    0x12  /* Control 7 */
#define COM7_RESET          0x80  /* Register reset */
#define COM7_FMT_MASK         0x38
#define COM7_FMT_VGA          0x00
#define COM7_FMT_CIF          0x20  /* CIF format */
#define COM7_FMT_QVGA         0x10  /* QVGA format */
#define COM7_FMT_QCIF         0x08  /* QCIF format */
#define COM7_RGB    0x04  /* bits 0 and 2 - RGB format */
#define COM7_YUV    0x00  /* YUV */
#define COM7_BAYER          0x01  /* Bayer format */
#define COM7_PBAYER         0x05  /* "rocessed bayer" */
#define REG_COM8    0x13  /* Control 8 */
#define COM8_FASTAEC          0x80  /* Enable fast AGC/AEC */
#define COM8_AECSTEP          0x40  /* Unlimited AEC step size */
#define COM8_BFILT    0x20  /* Band filter enable */
#define COM8_AGC    0x04  /* Auto gain enable */
#define COM8_AWB    0x02  /* White balance enable */
#define COM8_AEC    0x01  /* Auto exposure enable */
#define REG_COM9    0x14  /* Control 9- gain ceiling */
#define REG_COM10   0x15  /* Control 10 */
#define COM10_HSYNC         0x40  /* HSYNC instead of HREF */
#define COM10_PCLK_HB         0x20  /* Suppress PCLK on horiz blank */
#define COM10_HREF_REV          0x08  /* Reverse HREF */
#define COM10_VS_LEAD           0x04  /* VSYNC on clock leading edge */
#define COM10_VS_NEG          0x02  /* VSYNC negative */
#define COM10_HS_NEG          0x01  /* HSYNC negative */
#define REG_HSTART    0x17  /* Horiz start high bits */
#define REG_HSTOP   0x18  /* Horiz stop high bits */
#define REG_VSTART    0x19  /* Vert start high bits */
#define REG_VSTOP   0x1a  /* Vert stop high bits */
#define REG_PSHFT   0x1b  /* Pixel delay after HREF */
#define REG_MIDH    0x1c  /* Manuf. ID high */
#define REG_MIDL    0x1d  /* Manuf. ID low */
#define REG_MVFP    0x1e  /* Mirror / vflip */
#define MVFP_MIRROR         0x20  /* Mirror image */
#define MVFP_FLIP   0x10  /* Vertical flip */
#define REG_AEW           0x24  /* AGC upper limit */
#define REG_AEB           0x25  /* AGC lower limit */
#define REG_VPT           0x26  /* AGC/AEC fast mode op region */
#define REG_HSYST   0x30  /* HSYNC rising edge delay */
#define REG_HSYEN   0x31  /* HSYNC falling edge delay */
#define REG_HREF    0x32  /* HREF pieces */
#define REG_TSLB    0x3a  /* lots of stuff */
#define TSLB_YLAST    0x04  /* UYVY or VYUY - see com13 */
#define REG_COM11   0x3b  /* Control 11 */
#define COM11_NIGHT         0x80  /* NIght mode enable */
#define COM11_NMFR          0x60  /* Two bit NM frame rate */
#define COM11_HZAUTO          0x10  /* Auto detect 50/60 Hz */
#define COM11_50HZ          0x08  /* Manual 50Hz select */
#define COM11_EXP   0x02
#define REG_COM12   0x3c  /* Control 12 */
#define COM12_HREF          0x80  /* HREF always */
#define REG_COM13   0x3d  /* Control 13 */
#define COM13_GAMMA         0x80  /* Gamma enable */
#define COM13_UVSAT         0x40  /* UV saturation auto adjustment */
#define COM13_UVSWAP          0x01  /* V before U - w/TSLB */
#define REG_COM14   0x3e  /* Control 14 */
#define COM14_DCWEN         0x10  /* DCW/PCLK-scale enable */
#define REG_EDGE    0x3f  /* Edge enhancement factor */
#define REG_COM15   0x40  /* Control 15 */
#define COM15_R10F0         0x00  /* Data range 10 to F0 */
#define COM15_R01FE         0x80  /*      01 to FE */
#define COM15_R00FF         0xc0  /*      00 to FF */
#define COM15_RGB565          0x10  /* RGB565 output */
#define COM15_RGB555          0x30  /* RGB555 output */
#define REG_COM16   0x41  /* Control 16 */
#define COM16_AWBGAIN         0x08  /* AWB gain enable */
#define REG_COM17   0x42  /* Control 17 */
#define COM17_AECWIN          0xc0  /* AEC window - must match COM4 */
#define COM17_CBAR          0x08  /* DSP Color bar */

#define CMATRIX_LEN             6
#define REG_BRIGHT    0x55  /* Brightness */
#define REG_REG76   0x76  /* OV's name */
#define R76_BLKPCOR         0x80  /* Black pixel correction enable */
#define R76_WHTPCOR         0x40  /* White pixel correction enable */
#define REG_RGB444          0x8c  /* RGB 444 control */
#define R444_ENABLE         0x02  /* Turn on RGB444, overrides 5x5 */
#define R444_RGBX   0x01  /* Empty nibble at end */
#define REG_HAECC1    0x9f  /* Hist AEC/AGC control 1 */
#define REG_HAECC2    0xa0  /* Hist AEC/AGC control 2 */
#define REG_BD50MAX         0xa5  /* 50hz banding step limit */
#define REG_HAECC3    0xa6  /* Hist AEC/AGC control 3 */
#define REG_HAECC4    0xa7  /* Hist AEC/AGC control 4 */
#define REG_HAECC5    0xa8  /* Hist AEC/AGC control 5 */
#define REG_HAECC6    0xa9  /* Hist AEC/AGC control 6 */
#define REG_HAECC7    0xaa  /* Hist AEC/AGC control 7 */
#define REG_BD60MAX         0xab  /* 60hz banding step limit */
#define MTX1            0x4f  /* Matrix Coefficient 1 */
#define MTX2            0x50  /* Matrix Coefficient 2 */
#define MTX3            0x51  /* Matrix Coefficient 3 */
#define MTX4            0x52  /* Matrix Coefficient 4 */
#define MTX5            0x53  /* Matrix Coefficient 5 */
#define MTX6            0x54  /* Matrix Coefficient 6 */
#define REG_CONTRAS         0x56  /* Contrast control */
#define MTXS            0x58  /* Matrix Coefficient Sign */
#define AWBC7           0x59  /* AWB Control 7 */
#define AWBC8           0x5a  /* AWB Control 8 */
#define AWBC9           0x5b  /* AWB Control 9 */
#define AWBC10            0x5c  /* AWB Control 10 */
#define AWBC11            0x5d  /* AWB Control 11 */
#define AWBC12            0x5e  /* AWB Control 12 */
#define REG_GFI           0x69  /* Fix gain control */
#define GGAIN           0x6a  /* G Channel AWB Gain */
#define DBLV            0x6b  
#define AWBCTR3           0x6c  /* AWB Control 3 */
#define AWBCTR2           0x6d  /* AWB Control 2 */
#define AWBCTR1           0x6e  /* AWB Control 1 */
#define AWBCTR0           0x6f  /* AWB Control 0 */

struct regval_list{
  uint8_t reg_num;
  uint16_t value;
};

const struct regval_list qvga_ov7670[] PROGMEM = {
  { REG_COM14, 0x19 },
  { 0x72, 0x11 },
  { 0x73, 0xf1 },

  { REG_HSTART, 0x16 },
  { REG_HSTOP, 0x04 },
  { REG_HREF, 0xa4 },
  { REG_VSTART, 0x02 },
  { REG_VSTOP, 0x7a },
  { REG_VREF, 0x0a },


/*  { REG_HSTART, 0x16 },
  { REG_HSTOP, 0x04 },
  { REG_HREF, 0x24 },
  { REG_VSTART, 0x02 },
  { REG_VSTOP, 0x7a },
  { REG_VREF, 0x0a },*/
  { 0xff, 0xff }, /* END MARKER */
};

const struct regval_list yuv422_ov7670[] PROGMEM = {
  { REG_COM7, 0x0 },  /* Selects YUV mode */
  { REG_RGB444, 0 },  /* No RGB444 please */
  { REG_COM1, 0 },
  { REG_COM15, COM15_R00FF },
  { REG_COM9, 0x6A }, /* 128x gain ceiling; 0x8 is reserved bit */
  { 0x4f, 0x80 },   /* "matrix coefficient 1" */
  { 0x50, 0x80 },   /* "matrix coefficient 2" */
  { 0x51, 0 },    /* vb */
  { 0x52, 0x22 },   /* "matrix coefficient 4" */
  { 0x53, 0x5e },   /* "matrix coefficient 5" */
  { 0x54, 0x80 },   /* "matrix coefficient 6" */
  { REG_COM13, COM13_UVSAT },
  { 0xff, 0xff },   /* END MARKER */
};

const struct regval_list ov7670_default_regs[] PROGMEM = {//from the linux driver
  { REG_COM7, COM7_RESET },
  { REG_TSLB, 0x04 }, /* OV */
  { REG_COM7, 0 },  /* VGA */
  /*
  * Set the hardware window.  These values from OV don't entirely
  * make sense - hstop is less than hstart.  But they work...
  */
  { REG_HSTART, 0x13 }, { REG_HSTOP, 0x01 },
  { REG_HREF, 0xb6 }, { REG_VSTART, 0x02 },
  { REG_VSTOP, 0x7a }, { REG_VREF, 0x0a },

  { REG_COM3, 0 }, { REG_COM14, 0 },
  /* Mystery scaling numbers */
  { 0x70, 0x3a }, { 0x71, 0x35 },
  { 0x72, 0x11 }, { 0x73, 0xf0 },
  { 0xa2,/* 0x02 changed to 1*/1 }, { REG_COM10, 0x0 },
  /* Gamma curve values */
  { 0x7a, 0x20 }, { 0x7b, 0x10 },
  { 0x7c, 0x1e }, { 0x7d, 0x35 },
  { 0x7e, 0x5a }, { 0x7f, 0x69 },
  { 0x80, 0x76 }, { 0x81, 0x80 },
  { 0x82, 0x88 }, { 0x83, 0x8f },
  { 0x84, 0x96 }, { 0x85, 0xa3 },
  { 0x86, 0xaf }, { 0x87, 0xc4 },
  { 0x88, 0xd7 }, { 0x89, 0xe8 },
  /* AGC and AEC parameters.  Note we start by disabling those features,
  then turn them only after tweaking the values. */
  { REG_COM8, COM8_FASTAEC | COM8_AECSTEP },
  { REG_GAIN, 0 }, { REG_AECH, 0 },
  { REG_COM4, 0x40 }, /* magic reserved bit */
  { REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
  { REG_BD50MAX, 0x05 }, { REG_BD60MAX, 0x07 },
  { REG_AEW, 0x95 }, { REG_AEB, 0x33 },
  { REG_VPT, 0xe3 }, { REG_HAECC1, 0x78 },
  { REG_HAECC2, 0x68 }, { 0xa1, 0x03 }, /* magic */
  { REG_HAECC3, 0xd8 }, { REG_HAECC4, 0xd8 },
  { REG_HAECC5, 0xf0 }, { REG_HAECC6, 0x90 },
  { REG_HAECC7, 0x94 },
  { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_AGC | COM8_AEC },
  { 0x30, 0 }, { 0x31, 0 },//disable some delays
  /* Almost all of these are magic "reserved" values.  */
  { REG_COM5, 0x61 }, { REG_COM6, 0x4b },
  { 0x16, 0x02 }, { REG_MVFP, 0x07 },
  { 0x21, 0x02 }, { 0x22, 0x91 },
  { 0x29, 0x07 }, { 0x33, 0x0b },
  { 0x35, 0x0b }, { 0x37, 0x1d },
  { 0x38, 0x71 }, { 0x39, 0x2a },
  { REG_COM12, 0x78 }, { 0x4d, 0x40 },
  { 0x4e, 0x20 }, { REG_GFIX, 0 },
  /*{0x6b, 0x4a},*/{ 0x74, 0x10 },
  { 0x8d, 0x4f }, { 0x8e, 0 },
  { 0x8f, 0 }, { 0x90, 0 },
  { 0x91, 0 }, { 0x96, 0 },
  { 0x9a, 0 }, { 0xb0, 0x84 },
  { 0xb1, 0x0c }, { 0xb2, 0x0e },
  { 0xb3, 0x82 }, { 0xb8, 0x0a },

  /* More reserved magic, some of which tweaks white balance */
  { 0x43, 0x0a }, { 0x44, 0xf0 },
  { 0x45, 0x34 }, { 0x46, 0x58 },
  { 0x47, 0x28 }, { 0x48, 0x3a },
  { 0x59, 0x88 }, { 0x5a, 0x88 },
  { 0x5b, 0x44 }, { 0x5c, 0x67 },
  { 0x5d, 0x49 }, { 0x5e, 0x0e },
  { 0x6c, 0x0a }, { 0x6d, 0x55 },
  { 0x6e, 0x11 }, { 0x6f, 0x9e }, /* it was 0x9F "9e for advance AWB" */
  { 0x6a, 0x40 }, { REG_BLUE, 0x40 },
  { REG_RED, 0x60 },
  { REG_COM8, COM8_FASTAEC | COM8_AECSTEP | COM8_AGC | COM8_AEC | COM8_AWB },

  /* Matrix coefficients */
  { 0x4f, 0x80 }, { 0x50, 0x80 },
  { 0x51, 0 },    { 0x52, 0x22 },
  { 0x53, 0x5e }, { 0x54, 0x80 },
  { 0x58, 0x9e },

  { REG_COM16, COM16_AWBGAIN }, { REG_EDGE, 0 },
  { 0x75, 0x05 }, { REG_REG76, 0xe1 },
  { 0x4c, 0 },     { 0x77, 0x01 },
  { REG_COM13, /*0xc3*/0x48 }, { 0x4b, 0x09 },
  { 0xc9, 0x60 },   /*{REG_COM16, 0x38},*/
  { 0x56, 0x40 },

  { 0x34, 0x11 }, { REG_COM11, COM11_EXP | COM11_HZAUTO },
  { 0xa4, 0x82/*Was 0x88*/ }, { 0x96, 0 },
  { 0x97, 0x30 }, { 0x98, 0x20 },
  { 0x99, 0x30 }, { 0x9a, 0x84 },
  { 0x9b, 0x29 }, { 0x9c, 0x03 },
  { 0x9d, 0x4c }, { 0x9e, 0x3f },
  { 0x78, 0x04 },

  /* Extra-weird stuff.  Some sort of multiplexor register */
  { 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 },
  { 0xff, 0xff }, /* END MARKER */
};


void error_led(void){
  DDRB |= 32;//make sure led is output
  while (1){//wait for reset
    PORTB ^= 32;// toggle led
    _delay_ms(100);
  }
}

void twiStart(void){
  TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);//send start
  while (!(TWCR & (1 << TWINT)));//wait for start to be transmitted
  if ((TWSR & 0xF8) != TW_START)
    error_led();
}

void twiWriteByte(uint8_t DATA, uint8_t type){
  TWDR = DATA;
  TWCR = _BV(TWINT) | _BV(TWEN);
  while (!(TWCR & (1 << TWINT))) {}
  if ((TWSR & 0xF8) != type)
    error_led();
}

void twiAddr(uint8_t addr, uint8_t typeTWI){
  TWDR = addr;//send address
  TWCR = _BV(TWINT) | _BV(TWEN);    /* clear interrupt to start transmission */
  while ((TWCR & _BV(TWINT)) == 0); /* wait for transmission */
  if ((TWSR & 0xF8) != typeTWI)
    error_led();
}

void wrReg(uint8_t reg, uint8_t dat){
  //send start condition
  twiStart();
  twiAddr(camAddr_WR, TW_MT_SLA_ACK);
  twiWriteByte(reg, TW_MT_DATA_ACK);
  twiWriteByte(dat, TW_MT_DATA_ACK);
  TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);//send stop
  _delay_ms(1);
}

static uint8_t twiRd(uint8_t nack){
  if (nack){
    TWCR = _BV(TWINT) | _BV(TWEN);
    while ((TWCR & _BV(TWINT)) == 0); /* wait for transmission */
    if ((TWSR & 0xF8) != TW_MR_DATA_NACK)
      error_led();
    return TWDR;
  }
  else{
    TWCR = _BV(TWINT) | _BV(TWEN) | _BV(TWEA);
    while ((TWCR & _BV(TWINT)) == 0); /* wait for transmission */
    if ((TWSR & 0xF8) != TW_MR_DATA_ACK)
      error_led();
    return TWDR;
  }
}

uint8_t rdReg(uint8_t reg){
  uint8_t dat;
  twiStart();
  twiAddr(camAddr_WR, TW_MT_SLA_ACK);
  twiWriteByte(reg, TW_MT_DATA_ACK);
  TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);//send stop
  _delay_ms(1);
  twiStart();
  twiAddr(camAddr_RD, TW_MR_SLA_ACK);
  dat = twiRd(1);
  TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);//send stop
  _delay_ms(1);
  return dat;
}

void wrSensorRegs8_8(const struct regval_list reglist[]){
  uint8_t reg_addr, reg_val;
  const struct regval_list *next = reglist;
  while ((reg_addr != 0xff) | (reg_val != 0xff)){
    reg_addr = pgm_read_byte(&next->reg_num);
    reg_val = pgm_read_byte(&next->value);
    wrReg(reg_addr, reg_val);
    next++;
  }
}

void setColor(void){
  wrSensorRegs8_8(yuv422_ov7670);
}

void setRes(void){
  wrReg(REG_COM3, 4); // REG_COM3 enable scaling
  wrSensorRegs8_8(qvga_ov7670);
}

void camInit(void){
  wrReg(0x12, 0x80);
  _delay_ms(100);
  wrSensorRegs8_8(ov7670_default_regs);
  wrReg(REG_COM10, 32);//PCLK does not toggle on HBLANK.
}

void arduinoUnoInut(void) {
  cli();//disable interrupts

    /* Setup the 8mhz PWM clock
  * This will be on pin 11*/
  DDRB |= (1 << 3);//pin 11
  ASSR &= ~(_BV(EXCLK) | _BV(AS2));
  TCCR2A = (1 << COM2A0) | (1 << WGM21) | (1 << WGM20);
  TCCR2B = (1 << WGM22) | (1 << CS20);
  OCR2A = 0;//(F_CPU)/(2*(X+1))
  DDRC &= ~15;//low d0-d3 camera
  DDRD &= ~252;//d7-d4 and interrupt pins
  _delay_ms(3000);

    //set up twi for 100khz
  TWSR &= ~3;//disable prescaler for TWI
  TWBR = 72;//set to 100khz

    //enable serial
  UBRR0H = 0;
  UBRR0L = 1;//0 = 2M baud rate. 1 = 1M baud. 3 = 0.5M. 7 = 250k 207 is 9600 baud rate.
  UCSR0A |= 2;//double speed aysnc
  UCSR0B = (1 << RXEN0) | (1 << TXEN0);//Enable receiver and transmitter
  UCSR0C = 6;//async 1 stop bit 8bit char no parity bits
}


void StringPgm(const char * str){
  do{
      while (!(UCSR0A & (1 << UDRE0)));//wait for byte to transmit
      UDR0 = pgm_read_byte_near(str);
      while (!(UCSR0A & (1 << UDRE0)));//wait for byte to transmit
  } while (pgm_read_byte_near(++str));
}

static void captureImg(uint16_t wg, uint16_t hg){
  uint16_t y, x;

  StringPgm(PSTR("*RDY*"));

  while (!(PIND & 8));//wait for high
  while ((PIND & 8));//wait for low

    y = hg;
  while (y--){
        x = wg;
      //while (!(PIND & 256));//wait for high
    while (x--){
      while ((PIND & 4));//wait for low
            UDR0 = (PINC & 15) | (PIND & 240);
          while (!(UCSR0A & (1 << UDRE0)));//wait for byte to transmit
      while (!(PIND & 4));//wait for high
      while ((PIND & 4));//wait for low
      while (!(PIND & 4));//wait for high
    }
    //  while ((PIND & 256));//wait for low
  }
   // _delay_ms(100);
}

void setup(){
  arduinoUnoInut();
  camInit();
  setRes();
  setColor();
  wrReg(0x11, 10); //Earlier it had the value: wrReg(0x11, 12); New version works better for me !!!!
}


void loop(){
  captureImg(320, 240);
}

        程序烧录进arduino后,除了power灯之外,如果led灯(arduino nano是13脚)亮,说明出错,连接有问题,请检查插线,正常会显示tx灯闪烁,隔一段闪一次,不是狂闪,闪一次说明采集完成了一张照片,也就是读取了一帧,并传输完成。

        网上也搜集到了其他网友根据代码编好的windows系统的采集软件,省了不少心思,不用java,c的乱写了。
        程序在下面附件内。
         ReadSerialPortWin.zip (6.19 KB, 下载次数: 68)
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 楼主| 发表于 2017-9-2 15:40:46 | 显示全部楼层
我们做的应用主要用于光学识别追踪方面,对帧速和采样要求会比较高一点,不过也看到国外有些创客做到了30帧,回头弄个最小的atm32板测试。坛子里这方面的资料比较少
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发表于 2017-8-30 16:23:46 | 显示全部楼层
帧速有多少?
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 楼主| 发表于 2017-8-30 16:57:35 | 显示全部楼层
arduino处理能力有限,上面贴图中有数据读取的毫秒数,这也是我们让他吃灰的原因
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发表于 2017-8-31 08:26:06 | 显示全部楼层
相当可以啊。
arduino也有基于ARM的板子,处理能力可以满足要求的。
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 楼主| 发表于 2017-8-31 11:15:47 | 显示全部楼层
正准备弄个arm的arduino,有没有好的推荐,谢谢
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发表于 2017-9-2 14:44:13 | 显示全部楼层
DUE还是挺快的
之前带FIFO和不带FIFO都测试通过,相对来说,不带FIFO的接线少
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发表于 2017-9-3 12:13:20 | 显示全部楼层
牛,ov7670资料太难找了。
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发表于 2017-10-2 20:51:56 | 显示全部楼层
#include <stdint.h>
#include <avr/io.h>
#include <util/twi.h>
#include <util/delay.h>
#include <avr/pgmspace.h>

有人知道這5個在哪裡可以下載, 找不到
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