STM32F103驱动OV7670代码介绍

1万 · 2021-8-5 12:05

1）寄存器介绍
typedef enum
{
ov7670_reg_gain = 0x00,
ov7670_reg_blue = 0x01,
ov7670_reg_red = 0x02,
ov7670_reg_vref = 0x03,
ov7670_reg_com1 = 0x04,
ov7670_reg_bave = 0x05,
ov7670_reg_gbave=0x06,
ov7670_reg_aechh=0x07,
ov7670_reg_rave = 0x08,
ov7670_reg_com2 = 0x09,
ov7670_reg_pid = 0x0a,
ov7670_reg_ver = 0x0b,
ov7670_reg_com3 = 0x0c,
ov7670_reg_com4 = 0x0d,
ov7670_reg_com5 = 0x0e,
ov7670_reg_com6 = 0x0f,
ov7670_reg_aech = 0x10,
ov7670_reg_clkrc = 0x11,
ov7670_reg_com7 = 0x12,
ov7670_reg_com8 = 0x13,
ov7670_reg_com9 = 0x14,
ov7670_reg_com10=0x15,
ov7670_reg_rsvd1 = 0x16,
ov7670_reg_hstart= 0x17,
ov7670_reg_hstop = 0x18,
ov7670_reg_vstart= 0x19,
ov7670_reg_vstop = 0x1a,
ov7670_reg_pshft = 0x1b,
ov7670_reg_midh = 0x1c,
ov7670_reg_midl = 0x1d,
ov7670_reg_mvfp = 0x1e,
ov7670_reg_laec = 0x1f,
ov7670_reg_adctl0= 0x20,
ov7670_reg_adctl1= 0x21,
ov7670_reg_adctl2= 0x22,
ov7670_reg_adctl3= 0x23,
ov7670_reg_aew = 0x24,
ov7670_reg_aeb = 0x25,
ov7670_reg_vpt = 0x26,
ov7670_reg_bbias = 0x27,
ov7670_reg_gbbias=0x28,
ov7670_reg_rsvd2 = 0x29,
ov7670_reg_exhch= 0x2a,
ov7670_reg_exhcl = 0x2b,
ov7670_reg_rbias = 0x2c,
ov7670_reg_advfl = 0x2d,
ov7670_reg_advfh = 0x2e,
ov7670_reg_yave = 0x2f,
ov7670_reg_hsyst = 0x30,
ov7670_reg_hsyen= 0x31,
ov7670_reg_href = 0x32,
ov7670_reg_chlf = 0x33,
ov7670_reg_arblm = 0x34,
ov7670_reg_rsvd3 = 0x35,
ov7670_reg_rsvd4 = 0x36,
ov7670_reg_adc = 0x37,
ov7670_reg_acom = 0x38,
ov7670_reg_ofon = 0x39,
ov7670_reg_tslb = 0x3a,
ov7670_reg_com11=0x3b,
ov7670_reg_com12=0x3c,
ov7670_reg_com13=0x3d,
ov7670_reg_com14=0x3e,
ov7670_reg_edge = 0x3f,
ov7670_reg_com15=0x40,
ov7670_reg_com16=0x41,
ov7670_reg_com17=0x42,
ov7670_reg_awbc1=0x43,
ov7670_reg_awbc2=0x44,
ov7670_reg_awbc3=0x45,
ov7670_reg_awbc4=0x46,
ov7670_reg_awbc5=0x47,
ov7670_reg_awbc6=0x48,
ov7670_reg_rsvd5 = 0x49,
ov7670_reg_rsvd6 = 0x4a,
ov7670_reg_rgb4b= 0x4b,
ov7670_reg_dnsth = 0x4c,
ov7670_reg_rsvd7 = 0x4d,
ov7670_reg_rsvd8 = 0x4e,
ov7670_reg_mtx1 = 0x4f,
ov7670_reg_mtx2 = 0x50,
ov7670_reg_mtx3 = 0x51,
ov7670_reg_mtx4 = 0x52,
ov7670_reg_mtx5 = 0x53,
ov7670_reg_mtx6 = 0x54,
ov7670_reg_bright= 0x55,
ov7670_reg_contras=0x56,
ov7670_reg_contras_center=0x57,
ov7670_reg_mtxs = 0x58,
ov7670_reg_rsvd9 = 0x59,
ov7670_reg_rsd10= 0x5a,
ov7670_reg_rsd11= 0x5b,
ov7670_reg_rsd12 = 0x5c,
ov7670_reg_rsd13 = 0x5d,
ov7670_reg_rsd14 = 0x5e,
ov7670_reg_rsd15 = 0x5f,
ov7670_reg_rsd16 = 0x60,
ov7670_reg_rsd17 = 0x61,
ov7670_reg_lcc1 = 0x62,
ov7670_reg_lcc2 = 0x63,
ov7670_reg_lcc3 = 0x64,
ov7670_reg_lcc4 = 0x65,
ov7670_reg_lcc5 = 0x66,
ov7670_reg_manu = 0x67,
ov7670_reg_manv = 0x68,
ov7670_reg_gfix = 0x69,
ov7670_reg_ggain = 0x6a,
ov7670_reg_dblv = 0x6b,
ov7670_reg_awbctr3=0x6c,
ov7670_reg_awbctr2=0x6d,
ov7670_reg_awbctr1=0x6e,
ov7670_reg_awbctr0=0x6f,
ov7670_reg_scaling_xsc=0x70,
ov7670_reg_scaling_ysc=0x71,
ov7670_reg_scaling_dcwctr=0x72,
ov7670_reg_scaling_pclkdiv=0x73,
ov7670_reg_74 = 0x74,
ov7670_reg_75 = 0x75,
ov7670_reg_76 = 0x76,
ov7670_reg_77 = 0x77,
ov7670_reg_rsd18 = 0x78,
ov7670_reg_rsd19 = 0x79,
ov7670_reg_slop = 0x7a,
ov7670_reg_cam1 = 0x7b,
ov7670_reg_cam2 = 0x7c,
ov7670_reg_cam3 = 0x7d,
ov7670_reg_cam4 = 0x7e,
ov7670_reg_cam5 = 0x7f,
ov7670_reg_cam6 = 0x80,
ov7670_reg_cam7 = 0x81,
ov7670_reg_cam8 = 0x82,
ov7670_reg_cam9 = 0x83,
ov7670_reg_cam10=0x84,
ov7670_reg_cam11=0x85,
ov7670_reg_cam12=0x86,
ov7670_reg_cam13=0x87,
ov7670_reg_cam14=0x88,
ov7670_reg_cam15=0x89,
ov7670_reg_rsd20 = 0x8a,
ov7670_reg_rsd21 = 0x8b,
ov7670_reg_rgb444=0x8c,
ov7670_reg_rsd22= 0x8d,
ov7670_reg_rsd23 = 0x8e,
ov7670_reg_rsd24 = 0x8f,
ov7670_reg_rsd25 = 0x90,
ov7670_reg_rsd26 = 0x91,
ov7670_reg_dmlnl = 0x92,
ov7670_reg_dmlnh= 0x93,
ov7670_reg_lcc6 = 0x94,
ov7670_reg_lcc7 = 0x95,
ov7670_reg_bd50st=0x9d,
ov7670_reg_bd60st=0x9e,
ov7670_reg_haecc1=0x9f,
ov7670_reg_haecc2=0xa0,
ov7670_reg_scaling_pclk_dly=0xa2,
ov7670_reg_nt_ctl = 0xa4,
ov7670_reg_bd50max=0xa5,
ov7670_reg_haecc3=0xa6,
ov7670_reg_haecc4=0xa7,
ov7670_reg_haecc5=0xa8,
ov7670_reg_haecc6=0xa9,
ov7670_reg_haecc7=0xaa,
ov7670_reg_bd60max=0xab,
ov7670_reg_stropt=0xac,
ov7670_reg_str_r = 0xad,
ov7670_reg_str_g = 0xae,
ov7670_reg_str_b = 0xaf,
ov7670_reg_ablc1= 0xb1,
ov7670_reg_thl_st= 0xb3,
ov7670_reg_thl_dlt=0xb5,
ov7670_reg_adchb= 0xbe,
ov7670_reg_adchr = 0xbf,
ov7670_reg_adchgb= 0xc0,
ov7670_reg_adchgr=0xc1,
ov7670_reg_satctl = 0xc9,
}ov7670_reg_index_e;

1万 · 2021-8-5 12:05

2）函数定义
uint8_t hw_ov7670_init(void);
uint8_t hw_ov7670_control(uint8_t control);
uint8_t hw_ov7670_set_light_mode(uint8_t mode);
uint8_t hw_ov7670_set_color_saturation(uint8_t sat);
uint8_t hw_ov7670_set_brightness(uint8_t bright);
uint8_t hw_ov7670_set_contrast(uint8_t contrast);
uint8_t hw_ov7670_set_special_effect(uint8_t eft);
uint8_t hw_ov7670_set_window(uint16_t sx,uint16_t sy,uint16_t width,uint16_t height);
uint8_t hw_ov7670_is_start(void);
void hw_ov7670_get_data_send(void);

1万 · 2021-8-5 12:05

3）初始化

/******************************************************************************
* func name : hw_ov7670_init
* para       : NULL
* return    : ov7670 init result
* description : ov7670 init
******************************************************************************/
uint8_t hw_ov7670_init()
{
uint16_t i=0;
uint8_t pid_msb,pid_lsb;
uint8_t vid_h,vid_l;

GPIO_InitTypeDef  GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

/* Enable ov7670 clock */
RCC_APB2PeriphClockCmd(OV7670_FIFO_WEN_PERIPH_CLK |OV7670_FIFO_RCLK_PERIPH_CLK |OV7670_FIFO_RRST_PERIPH_CLK |
                        OV7670_FIFO_OE_PERIPH_CLK |OV7670_FIFO_WRST_PERIPH_CLK |OV7670_VSYNC_PERIPH_CLK |
                        OV7670_DATA_PERIPH_CLK  | RCC_APB2Periph_AFIO,ENABLE);

/* GPIO init */
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin=OV7670_VSYNC;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(OV7670_VSYNC_GPIO,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin=OV7670_FIFO_WEN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(OV7670_FIFO_WEN_GPIO,&GPIO_InitStructure);
GPIO_SetBits(OV7670_FIFO_WEN_GPIO,OV7670_FIFO_WEN);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin=OV7670_FIFO_RCLK;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(OV7670_FIFO_RCLK_GPIO,&GPIO_InitStructure);
GPIO_SetBits(OV7670_FIFO_RCLK_GPIO,OV7670_FIFO_RCLK);

GPIO_InitStructure.GPIO_Pin  = OV7670_FIFO_RRST;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(OV7670_FIFO_RRST_GPIO, &GPIO_InitStructure);
GPIO_SetBits(OV7670_FIFO_RRST_GPIO,OV7670_FIFO_RRST);

GPIO_InitStructure.GPIO_Pin  = OV7670_FIFO_OE;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(OV7670_FIFO_OE_GPIO, &GPIO_InitStructure);
GPIO_SetBits(OV7670_FIFO_OE_GPIO,OV7670_FIFO_OE);

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin=OV7670_FIFO_WRST;
GPIO_Init(OV7670_FIFO_WRST_GPIO, &GPIO_InitStructure);
GPIO_SetBits(OV7670_FIFO_WRST_GPIO,OV7670_FIFO_WRST);

GPIO_InitStructure.GPIO_Pin  = OV7670_D0 | OV7670_D1 | OV7670_D2 | OV7670_D3 |
                                 OV7670_D4 | OV7670_D5 | OV7670_D6 | OV7670_D7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(OV7670_DATA_GPIO, &GPIO_InitStructure);

GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);

protocol_sccb_init();

if(protocol_sccb_write_reg(ov7670_reg_com7,0x80))
      return HW_ERR_OV7670_SCCB_ERR;

hw_delay_us(500);

vid_h = protocol_sccb_read_reg(ov7670_reg_midh);
vid_l = protocol_sccb_read_reg(ov7670_reg_midl);
pid_msb = protocol_sccb_read_reg(ov7670_reg_pid);
pid_lsb = protocol_sccb_read_reg(ov7670_reg_ver);
HW_DEBUG("PIDM 0x%02x PIDL 0x%02x,VIDH 0x%02x VIDL 0x%02x\n",pid_msb,pid_lsb,vid_h,vid_l);

for(i=0; i<sizeof(ov7670_init_reg_tbl_new)/sizeof(ov7670_init_reg_tbl_new[0]); i++)
{
      protocol_sccb_write_reg(ov7670_init_reg_tbl_new[i][0],ov7670_init_reg_tbl_new[i][1]);
}

GPIO_EXTILineConfig(OV7670_EXIT_GPIO,OV7670_EXIT_PIN);

EXTI_InitStructure.EXTI_Line=OV7670_EXIT_LINE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = OV7670_EXIT_IRQ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =OV7670_PREE_PRIO;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = OV7670_SUB_PRIO;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

hw_ov7670_set_window(0,0,320,240);
hw_ov7670_control(ov7670_ctl_start);

return HW_ERR_OK;
}

1万 · 2021-8-5 12:06

4）设置亮度模式

/******************************************************************************
* func name : hw_ov7670_set_light_mode
* para       : mode
ov7670_light_auto --> set auto mode
ov7670_light_sunny --> set sunny mode
ov7670_light_cloudy --> set cloudy mode
ov7670_light_office --> set office mode
ov7670_light_home --> set home mode
* return    : ov7670 hw_ov7670_set_light_mode result
* description : set ov7670 light mode
******************************************************************************/
uint8_t hw_ov7670_set_light_mode(uint8_t mode)
{
uint8_t reg13val=0xE7;
uint8_t reg01val=0;
uint8_t reg02val=0;
switch(mode)
{
case ov7670_light_sunny:
      reg13val=0xE5;
      reg01val=0x5A;
      reg02val=0x5C;
      break;
case ov7670_light_cloudy:
      reg13val=0xE5;
      reg01val=0x58;
      reg02val=0x60;
      break;
case ov7670_light_office:
      reg13val=0xE5;
      reg01val=0x84;
      reg02val=0x4c;
      break;
case ov7670_light_home:
      reg13val=0xE5;
      reg01val=0x96;
      reg02val=0x40;
      break;
}
protocol_sccb_write_reg(ov7670_reg_com8,reg13val);
protocol_sccb_write_reg(ov7670_reg_blue,reg01val);
protocol_sccb_write_reg(ov7670_reg_red,reg02val);
return HW_ERR_OK;
}

1万 · 2021-8-5 12:06

5）设置色彩饱和度

/******************************************************************************
* func name : hw_ov7670_set_color_saturation
* para       : sat
0 --> -2
1 --> -1
2 --> 0
3 --> 1
4 --> 2
* return    : ov7670 hw_ov7670_set_color_saturation result
* description : set ov7670 color saturation
******************************************************************************/
uint8_t hw_ov7670_set_color_saturation(uint8_t sat)
{
uint8_t reg4f5054val=0x80;
uint8_t reg52val=0x22;
uint8_t reg53val=0x5E;
switch(sat)
{
case 0:
      reg4f5054val=0x40;
      reg52val=0x11;
      reg53val=0x2F;
      break;
case 1:
      reg4f5054val=0x66;
      reg52val=0x1B;
      reg53val=0x4B;
      break;
case 3:
      reg4f5054val=0x99;
      reg52val=0x28;
      reg53val=0x71;
      break;
case 4:
      reg4f5054val=0xC0;
      reg52val=0x33;
      reg53val=0x8D;
      break;
}
protocol_sccb_write_reg(ov7670_reg_mtx1,reg4f5054val); //色彩矩阵系数1
protocol_sccb_write_reg(ov7670_reg_mtx2,reg4f5054val); //色彩矩阵系数2
protocol_sccb_write_reg(ov7670_reg_mtx3,0x00); //色彩矩阵系数3
protocol_sccb_write_reg(ov7670_reg_mtx4,reg52val); //色彩矩阵系数4
protocol_sccb_write_reg(ov7670_reg_mtx5,reg53val); //色彩矩阵系数5
protocol_sccb_write_reg(ov7670_reg_mtx6,reg4f5054val); //色彩矩阵系数6
protocol_sccb_write_reg(ov7670_reg_mtxs,0x9E); //MTXS

return HW_ERR_OK;
}

1万 · 2021-8-5 12:06

6）设置亮度

/******************************************************************************
* func name : hw_ov7670_set_brightness
* para       : bright
0 --> -2
1 --> -1
2 --> 0
3 --> 1
4 --> 2
* return    : ov7670 hw_ov7670_set_brightness result
* description : set ov7670 brightness
******************************************************************************/
uint8_t hw_ov7670_set_brightness(uint8_t bright)
{
uint8_t reg55val=0x00;
switch(bright)
{
case 0:
      reg55val=0xB0;
      break;
case 1:
      reg55val=0x98;
      break;
case 3:
      reg55val=0x18;
      break;
case 4:
      reg55val=0x30;
      break;
}
protocol_sccb_write_reg(ov7670_reg_bright,reg55val); //亮度调节
return HW_ERR_OK;
}

1万 · 2021-8-5 12:06

7）设置对比度

/******************************************************************************
* func name : hw_ov7670_set_contrast
* para       : bright
0 --> -2
1 --> -1
2 --> 0
3 --> 1
4 --> 2
* return    : ov7670 hw_ov7670_set_contrast result
* description : set ov7670 contrast
******************************************************************************/
uint8_t hw_ov7670_set_contrast(uint8_t contrast)
{
uint8_t reg56val=0x40;
switch(contrast)
{
case 0:
      reg56val=0x30;
      break;
case 1:
      reg56val=0x38;
      break;
case 3:
      reg56val=0x50;
      break;
case 4:
      reg56val=0x60;
      break;
}
protocol_sccb_write_reg(ov7670_reg_contras,reg56val); //对比度调节
return HW_ERR_OK;
}

1万 · 2021-8-5 12:06

8）设置特殊效果
/******************************************************************************
* func name : hw_ov7670_set_special_effect
* para       : bright
0 --> 普通模式
1 --> 负片
2 --> 黑白
3 --> 偏红色
4 --> 偏绿色
5 --> 偏蓝色
6 --> 复古
* return    : ov7670 hw_ov7670_set_special_effect result
* description : set ov7670 special effect
******************************************************************************/
uint8_t hw_ov7670_set_special_effect(uint8_t eft)
{
uint8_t reg3aval=0X04;
uint8_t reg67val=0XC0;
uint8_t reg68val=0X80;
switch(eft)
{
case 1:
      reg3aval=0X24;
      reg67val=0X80;
      reg68val=0X80;
      break;
case 2:
      reg3aval=0X14;
      reg67val=0X80;
      reg68val=0X80;
      break;
case 3:
      reg3aval=0X14;
      reg67val=0Xc0;
      reg68val=0X80;
      break;
case 4:
      reg3aval=0X14;
      reg67val=0X40;
      reg68val=0X40;
      break;
case 5:
      reg3aval=0X14;
      reg67val=0X80;
      reg68val=0XC0;
      break;
case 6:
      reg3aval=0X14;
      reg67val=0XA0;
      reg68val=0X40;
      break;
}
protocol_sccb_write_reg(ov7670_reg_tslb,reg3aval);
protocol_sccb_write_reg(ov7670_reg_manv,reg67val);
protocol_sccb_write_reg(ov7670_reg_manu,reg68val);
return HW_ERR_OK;
}

1万 · 2021-8-5 12:06

9）中断处理
void OV7670_EXIT_FUNC(void)
{
if(EXTI_GetITStatus(OV7670_EXIT_LINE)==SET)
{
      OV7670_WRST_L;
      OV7670_WRST_H;
      OV7670_WEN_H;
      ov7670_frame_interrupt++;
}
EXTI_ClearITPendingBit(OV7670_EXIT_LINE);
}