如下是ov7670在stm32f407上的使用框架
ov7670.h
#ifndef OV7670_H
#define OV7670_H
#include "stm32f4xx.h"
//===============以下引脚定义需要修改============
#define SCCB_ID 0X42
#define SCCB_SDA GPIOC,GPIO_Pin_1
#define SCCB_SCL GPIOC,GPIO_Pin_0
#define DCMI_HSYNC_PIN GPIOA,GPIO_Pin_4
#define DCMI_HSYNC_PIN_S GPIOA,GPIO_PinSource4
#define DCMI_PIXCLK_PIN GPIOA,GPIO_Pin_6
#define DCMI_PIXCLK_PIN_S GPIOA,GPIO_PinSource6
#define DCMI_VSYNC_PIN GPIOB,GPIO_Pin_7
#define DCMI_VSYNC_PIN_S GPIOB,GPIO_PinSource7
#define DCMI_D0_PIN GPIOC,GPIO_Pin_6
#define DCMI_D0_PIN_S GPIOC,GPIO_PinSource6
#define DCMI_D1_PIN GPIOC,GPIO_Pin_7
#define DCMI_D1_PIN_S GPIOC,GPIO_PinSource7
#define DCMI_D2_PIN GPIOE,GPIO_Pin_0
#define DCMI_D2_PIN_S GPIOE,GPIO_PinSource0
#define DCMI_D3_PIN GPIOE,GPIO_Pin_1
#define DCMI_D3_PIN_S GPIOE,GPIO_PinSource1
#define DCMI_D4_PIN GPIOE,GPIO_Pin_4
#define DCMI_D4_PIN_S GPIOE,GPIO_PinSource4
#define DCMI_D5_PIN GPIOB,GPIO_Pin_6
#define DCMI_D5_PIN_S GPIOB,GPIO_PinSource6
#define DCMI_D6_PIN GPIOB,GPIO_Pin_8
#define DCMI_D6_PIN_S GPIOB,GPIO_PinSource8
#define DCMI_D7_PIN GPIOB,GPIO_Pin_9
#define DCMI_D7_PIN_S GPIOB,GPIO_PinSource9
//================================================
#define QVGA_LINE_PIX 160 //QVGA一行多少字
#define NOW_USE_FRAME (!CamNowFrame) //获取存放好数据的帧
extern int ov_frame;
extern int ov_line; //引用不安全
extern unsigned short OV7670_Frame[2][120][160]; //75KB
extern unsigned int OV7670_LineBuf[QVGA_LINE_PIX];
extern int CamNowFrame; //引用不安全
void Ov7670_SysClock_Init(void);
int check_camera(void);
void OV7670_Reg_Init(void);
void OV7670_DCMI_Init(uint16_t DCMI_CaptureMode,int PrePriority,int SubPriority);
void OV7670_DMA_LineCircular(int PrePriority,int SubPriority);
void DCMI_Start(void); //DCMI启动传输
void DCMI_Stop(void); //DCMI关闭传输
void CameraStart(void); //开始采集一帧
int IsCameraReady(void); //一帧是否已经完成
/*双缓冲图像处理方法
while(!check_camera());
OV7670_Reg_Init();
OV7670_DCMI_Init(DCMI_CaptureMode_Continuous,0,1);
OV7670_DMA_LineCircular(0,0);
DCMI_Start();
CameraStart();
while(1)
{
if(IsCameraReady())
{
CameraStart();
//TODO:
//Image Process,50ms/20fps
for(i=0;i<120;i++)
for(j=0;j<160;j++)
LCD_Fast_DrawPoint(j,i,OV7670_Frame[NOW_USE_FRAME][i][j]);
}
}
*/
#define CAMST_WaitStart 0
#define CAMST_Start 1
#define CAMST_WaitImg 2
#define CAMST_ImgReady 3
#define CAMST_ImgError 4 //图像出错状态
extern int CamState; //引用不安全
#endif
ov7670.c
/*
注意:PWND接地,RESET上拉到VDD
驱动平台:STM32F407
*/
#include "ov7670.h"
#include "cfg_func_f407.h"
#define SCCB_READ_SDA GPIO_ReadInputDataBit(SCCB_SDA)
int ov_frame=0;
int ov_line=0;
unsigned int OV7670_LineBuf[QVGA_LINE_PIX];
__align(4) unsigned short OV7670_Frame[2][120][160];
void Ov7670_SysClock_Init(void)
{
GPIO_Init_AF(GPIOA,GPIO_Pin_8);
/* HSE clock selected to output on MCO1 pin(PA8)*/
RCC_MCO1Config(RCC_MCO1Source_HSE, RCC_MCO1Div_1);
}
//====================SCCB===============================
void SCCB_SDA_IN(void)
{
GPIO_Init_InPU(SCCB_SDA);
}
void SCCB_SDA_OUT(void)
{
GPIO_Init_OutPP(SCCB_SDA);
}
void delay_uss(int n) //重要!这里需要改延时参数
{
int i;
for(i=0;i<9000;i++);
}
void SCCB_Init(void)
{
GPIO_Init_OutPP(SCCB_SDA);
GPIO_Init_OutPP(SCCB_SCL);
GPIO_SetBits(SCCB_SDA);
GPIO_SetBits(SCCB_SCL);
SCCB_SDA_OUT();
}
void SCCB_Start(void)
{
GPIO_SetBits(SCCB_SDA);
GPIO_SetBits(SCCB_SCL);
delay_uss(50);
GPIO_ResetBits(SCCB_SDA);
delay_uss(50);
GPIO_ResetBits(SCCB_SCL);
}
void SCCB_Stop(void)
{
GPIO_ResetBits(SCCB_SDA);
delay_uss(50);
GPIO_SetBits(SCCB_SCL);
delay_uss(50);
GPIO_SetBits(SCCB_SDA);
delay_uss(50);
}
void SCCB_No_Ack(void)
{
delay_uss(50);
GPIO_SetBits(SCCB_SDA);
GPIO_SetBits(SCCB_SCL);
delay_uss(50);
GPIO_ResetBits(SCCB_SCL);
delay_uss(50);
GPIO_ResetBits(SCCB_SDA);
delay_uss(50);
}
unsigned char SCCB_WR_Byte(unsigned char dat)
{
unsigned char j,res;
for(j=0;j<8;j++)
{
if(dat&0x80) GPIO_SetBits(SCCB_SDA);
else GPIO_ResetBits(SCCB_SDA);
dat<<=1;
delay_uss(50);
GPIO_SetBits(SCCB_SCL);
delay_uss(50);
GPIO_ResetBits(SCCB_SCL);
}
SCCB_SDA_IN();
delay_uss(50);
GPIO_SetBits(SCCB_SCL);
delay_uss(50);
if(SCCB_READ_SDA)res=1;
else res=0;
GPIO_ResetBits(SCCB_SCL);
SCCB_SDA_OUT();
return res;
}
unsigned char SCCB_RD_Byte(void)
{
unsigned char temp=0,j;
SCCB_SDA_IN();
for(j=8;j>0;j--)
{
delay_uss(50);
GPIO_SetBits(SCCB_SCL);
temp=temp<<1;
if(SCCB_READ_SDA)temp++;
delay_uss(50);
GPIO_ResetBits(SCCB_SCL);
}
SCCB_SDA_OUT();
return temp;
}
unsigned char SCCB_WR_Reg(unsigned char reg,unsigned char data)
{
unsigned char res=0;
SCCB_Start();
if(SCCB_WR_Byte(SCCB_ID))res=1;
delay_uss(100);
if(SCCB_WR_Byte(reg))res=1;
delay_uss(100);
if(SCCB_WR_Byte(data))res=1;
SCCB_Stop();
return res;
}
unsigned char SCCB_RD_Reg(unsigned char reg)
{
unsigned char val=0;
SCCB_Start();
SCCB_WR_Byte(SCCB_ID);
delay_uss(100);
SCCB_WR_Byte(reg);
delay_uss(100);
SCCB_Stop();
delay_uss(100);
SCCB_Start();
SCCB_WR_Byte(SCCB_ID|0X01);
delay_uss(100);
val=SCCB_RD_Byte();
SCCB_No_Ack();
SCCB_Stop();
return val;
}
//=====================OV7670_REG===========================
int check_camera(void)
{
unsigned char d1,d2;
SCCB_Init();
SCCB_WR_Reg(0x12,0x80);
d1=SCCB_RD_Reg(0x0b);
SCCB_WR_Reg(0x12,0x80);
d2=SCCB_RD_Reg(0x0a);
if(d1==0x73&&d2==0x76) return 1;
else return 0;
}
void OV7670_Reg_Init(void)
{
SCCB_Init();
SCCB_WR_Reg(0x3a, 0x0c);//dummy
SCCB_WR_Reg(0x40, 0xd0);//565 //d0
SCCB_WR_Reg(0x12, 0x14);//QVGA,RGB?? //14?
SCCB_WR_Reg(0x32, 0x80);//HREF control bit[2:0] HREF start 3 LSB
//bit[5:3] HSTOP HREF end 3LSB
SCCB_WR_Reg(0x17, 0x16);//HSTART start high 8-bit MSB
SCCB_WR_Reg(0x18, 0x04);//5 HSTOP end high 8-bit
SCCB_WR_Reg(0x19, 0x02);
SCCB_WR_Reg(0x1a, 0x7b);
SCCB_WR_Reg(0x03, 0x06);//0x0a,???????
SCCB_WR_Reg(0x0c, 0x00);
SCCB_WR_Reg(0x15, 0x00); ///00
SCCB_WR_Reg(0x3e, 0x00);
SCCB_WR_Reg(0x70, 0x3a);
SCCB_WR_Reg(0x71, 0x35);
SCCB_WR_Reg(0x72, 0x11);
SCCB_WR_Reg(0x73, 0x00);
SCCB_WR_Reg(0xa2, 0x02);
SCCB_WR_Reg(0x11, 0x81);//??????,0,???. //81
SCCB_WR_Reg(0x7a, 0x20);
SCCB_WR_Reg(0x7b, 0x1c);
SCCB_WR_Reg(0x7c, 0x28);
SCCB_WR_Reg(0x7d, 0x3c);
SCCB_WR_Reg(0x7e, 0x55);
SCCB_WR_Reg(0x7f, 0x68);
SCCB_WR_Reg(0x80, 0x76);
SCCB_WR_Reg(0x81, 0x80);
SCCB_WR_Reg(0x82, 0x88);
SCCB_WR_Reg(0x83, 0x8f);
SCCB_WR_Reg(0x84, 0x96);
SCCB_WR_Reg(0x85, 0xa3);
SCCB_WR_Reg(0x86, 0xaf);
SCCB_WR_Reg(0x87, 0xc4);
SCCB_WR_Reg(0x88, 0xd7);
SCCB_WR_Reg(0x89, 0xe8);
SCCB_WR_Reg(0x13, 0xe0);
SCCB_WR_Reg(0x00, 0x00);//AGC
SCCB_WR_Reg(0x10, 0x00);
SCCB_WR_Reg(0x0d, 0x00);//???, ?[5:4]: 01 ???,10 1/4??,11 1/4??
SCCB_WR_Reg(0x14, 0x28);//0x38, limit the max gain
SCCB_WR_Reg(0xa5, 0x05);
SCCB_WR_Reg(0xab, 0x07);
SCCB_WR_Reg(0x24, 0x75);
SCCB_WR_Reg(0x25, 0x63);
SCCB_WR_Reg(0x26, 0xA5);
SCCB_WR_Reg(0x9f, 0x78);
SCCB_WR_Reg(0xa0, 0x68);
SCCB_WR_Reg(0xa1, 0x03);
SCCB_WR_Reg(0xa6, 0xdf);
SCCB_WR_Reg(0xa7, 0xdf);
SCCB_WR_Reg(0xa8, 0xf0);
SCCB_WR_Reg(0xa9, 0x90);
SCCB_WR_Reg(0xaa, 0x94);
SCCB_WR_Reg(0x13, 0xe5);
SCCB_WR_Reg(0x0e, 0x61);
SCCB_WR_Reg(0x0f, 0x4b);
SCCB_WR_Reg(0x16, 0x02);
SCCB_WR_Reg(0x1e, 0x07);//镜像控制
SCCB_WR_Reg(0x21, 0x02);
SCCB_WR_Reg(0x22, 0x91);
SCCB_WR_Reg(0x29, 0x07);
SCCB_WR_Reg(0x33, 0x0b);
SCCB_WR_Reg(0x35, 0x0b);
SCCB_WR_Reg(0x37, 0x1d);
SCCB_WR_Reg(0x38, 0x71);
SCCB_WR_Reg(0x39, 0x2a);
SCCB_WR_Reg(0x3c, 0x78);
SCCB_WR_Reg(0x4d, 0x40);
SCCB_WR_Reg(0x4e, 0x20);
SCCB_WR_Reg(0x69, 0x00);
SCCB_WR_Reg(0x6b, 0x80);//8MHz*6=48Mhz //80
SCCB_WR_Reg(0x74, 0x19);
SCCB_WR_Reg(0x8d, 0x4f);
SCCB_WR_Reg(0x8e, 0x00);
SCCB_WR_Reg(0x8f, 0x00);
SCCB_WR_Reg(0x90, 0x00);
SCCB_WR_Reg(0x91, 0x00);
SCCB_WR_Reg(0x92, 0x00);
SCCB_WR_Reg(0x96, 0x00);
SCCB_WR_Reg(0x9a, 0x80);
SCCB_WR_Reg(0xb0, 0x84);
SCCB_WR_Reg(0xb1, 0x0c);
SCCB_WR_Reg(0xb2, 0x0e);
SCCB_WR_Reg(0xb3, 0x82);
SCCB_WR_Reg(0xb8, 0x0a);
SCCB_WR_Reg(0x43, 0x14);
SCCB_WR_Reg(0x44, 0xf0);
SCCB_WR_Reg(0x45, 0x34);
SCCB_WR_Reg(0x46, 0x58);
SCCB_WR_Reg(0x47, 0x28);
SCCB_WR_Reg(0x48, 0x3a);
SCCB_WR_Reg(0x59, 0x88);
SCCB_WR_Reg(0x5a, 0x88);
SCCB_WR_Reg(0x5b, 0x44);
SCCB_WR_Reg(0x5c, 0x67);
SCCB_WR_Reg(0x5d, 0x49);
SCCB_WR_Reg(0x5e, 0x0e);
SCCB_WR_Reg(0x64, 0x04);
SCCB_WR_Reg(0x65, 0x20);
SCCB_WR_Reg(0x66, 0x05);
SCCB_WR_Reg(0x94, 0x04);
SCCB_WR_Reg(0x95, 0x08);
SCCB_WR_Reg(0x6c, 0x0a);
SCCB_WR_Reg(0x6d, 0x55);
SCCB_WR_Reg(0x4f, 0x80);
SCCB_WR_Reg(0x50, 0x80);
SCCB_WR_Reg(0x51, 0x00);
SCCB_WR_Reg(0x52, 0x22);
SCCB_WR_Reg(0x53, 0x5e);
SCCB_WR_Reg(0x54, 0x80);
SCCB_WR_Reg(0x09, 0x03);//??????
SCCB_WR_Reg(0x6e, 0x11);
SCCB_WR_Reg(0x6f, 0x9f);//0x9e for advance AWB
SCCB_WR_Reg(0x55, 0x00);//??
SCCB_WR_Reg(0x56, 0x40);//??? 0x40
SCCB_WR_Reg(0x57, 0x40);//0x40, change according to Jim's request
//SCCB_WR_Reg(0x71, 0x80); //彩条
}
//==========================DCMI============================================
void OV7670_DCMI_Init(uint16_t DCMI_CaptureMode,int PrePriority,int SubPriority)
{
DCMI_InitTypeDef DCMI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_DCMI,ENABLE);//使能DCMI时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA时钟使能
NIVC_GROUP_CFG;
GPIO_Init_AF(DCMI_HSYNC_PIN);
GPIO_Init_AF(DCMI_PIXCLK_PIN);
GPIO_Init_AF(DCMI_VSYNC_PIN);
GPIO_Init_AF(DCMI_D0_PIN);
GPIO_Init_AF(DCMI_D1_PIN);
GPIO_Init_AF(DCMI_D2_PIN);
GPIO_Init_AF(DCMI_D3_PIN);
GPIO_Init_AF(DCMI_D4_PIN);
GPIO_Init_AF(DCMI_D5_PIN);
GPIO_Init_AF(DCMI_D6_PIN);
GPIO_Init_AF(DCMI_D7_PIN);
GPIO_PinAFConfig(DCMI_HSYNC_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_PIXCLK_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_VSYNC_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D0_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D1_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D2_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D3_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D4_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D5_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D6_PIN_S,GPIO_AF_DCMI);
GPIO_PinAFConfig(DCMI_D7_PIN_S,GPIO_AF_DCMI);
DCMI_DeInit();
DCMI_InitStructure.DCMI_CaptureMode = DCMI_CaptureMode;//DCMI_CaptureMode_Continuous
DCMI_InitStructure.DCMI_SynchroMode = DCMI_SynchroMode_Hardware;
DCMI_InitStructure.DCMI_PCKPolarity = DCMI_PCKPolarity_Rising;//像素时钟~沿有效
DCMI_InitStructure.DCMI_VSPolarity = DCMI_VSPolarity_High;//垂直同步低有效
DCMI_InitStructure.DCMI_HSPolarity = DCMI_HSPolarity_Low;//水平同步低有效
DCMI_InitStructure.DCMI_CaptureRate = DCMI_CaptureRate_All_Frame;
DCMI_InitStructure.DCMI_ExtendedDataMode = DCMI_ExtendedDataMode_8b;//8位数据宽度一个像素时钟
DCMI_Init(&DCMI_InitStructure);
DCMI_ITConfig(DCMI_IT_LINE|DCMI_IT_FRAME,ENABLE); //开启行中断,帧中断
DCMI_Cmd(ENABLE); //DCMI使能
NVIC_InitStructure.NVIC_IRQChannel = DCMI_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=PrePriority;//抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority =SubPriority;//响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//==========================DMA_ONCE============================================
void OV7670_DMA_LineCircular(int PrePriority,int SubPriority)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
NIVC_GROUP_CFG;
DMA_DeInit(DMA2_Stream1);
while (DMA_GetCmdStatus(DMA2_Stream1) != DISABLE){}//等待DMA2_Stream1可配置
DMA_InitStructure.DMA_Channel = DMA_Channel_1; //通道1 DCMI通道
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&DCMI->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (u32)&OV7670_LineBuf; //目标内存零地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//外设到存储器方向
DMA_InitStructure.DMA_BufferSize = QVGA_LINE_PIX;//DMA缓存大小,单位为数据单位,当外设传内存时数据单位为DMA_PeripheralDataSize
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设非增量模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//存储器增量模式
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //外设数据宽度32位
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Word; //存储器数据宽度32位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;// 循环模式
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//高优先级
DMA_InitStructure.DMA_FIFOMode=DMA_FIFOMode_Enable;
DMA_InitStructure.DMA_FIFOThreshold=DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst=DMA_MemoryBurst_Single; //内存突发传输每次转移一个数据
DMA_InitStructure.DMA_PeripheralBurst=DMA_PeripheralBurst_Single; //外设突发传输每次转移一个数据
DMA_Init(DMA2_Stream1, &DMA_InitStructure);
DMA_ITConfig(DMA2_Stream1,DMA_IT_TC,ENABLE);//开启传输完成终中断
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=PrePriority;//抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority =SubPriority; //响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure);
//DMA_Cmd(DMA2_Stream1, ENABLE);//开启DMA2_Stream1
}
void DCMI_Start(void) //DCMI启动传输
{
DCMI_CaptureCmd(ENABLE);//DCMI捕获使能
DMA_Cmd(DMA2_Stream1, ENABLE);//开启DMA2_Stream1
}
void DCMI_Stop(void) //DCMI关闭传输
{
DCMI_CaptureCmd(DISABLE);//DCMI捕获关闭
while(DCMI->CR&0X01); //等待传输结束
DMA_Cmd(DMA2_Stream1,DISABLE);//关闭DMA2,Stream1
}
int CamState=CAMST_WaitStart;
int CamNowFrame=0;
void CameraStart(void)
{
CamState=CAMST_Start;
CamNowFrame=!CamNowFrame;
}
int IsCameraReady(void)
{
return (CamState==CAMST_ImgReady);
}
void DCMI_IRQHandler(void)
{
if(DCMI_GetITStatus(DCMI_IT_LINE) != RESET)
{
switch(CamState)
{
case CAMST_WaitStart:
break;
case CAMST_Start:
break;
case CAMST_WaitImg:
ov_line++;
if(ov_line>=240)
{
CamState=CAMST_ImgReady;
ov_frame++;
}
break;
case CAMST_ImgReady:
break;
default:
break;
}
DCMI_ClearITPendingBit(DCMI_IT_LINE);
}
if(DCMI_GetITStatus(DCMI_IT_FRAME)!=RESET)//捕获到一帧图像
{
switch(CamState)
{
case CAMST_WaitStart:
break;
case CAMST_Start:
ov_line=0;
CamState=CAMST_WaitImg;
break;
case CAMST_WaitImg: //error
CamState=CAMST_ImgError;
break;
case CAMST_ImgReady:
break;
}
DCMI_ClearITPendingBit(DCMI_IT_FRAME);//清除中断标记
}
}
void DMA2_Stream1_IRQHandler(void)
{
int i;
if(DMA_GetITStatus(DMA2_Stream1,DMA_IT_TCIF1)==SET)//DMA2_Stream1传输完成
{
DMA_ClearITPendingBit(DMA2_Stream1,DMA_IT_TCIF1);//清除传输完成中断
//TODO:读取数据等操作
if((CamState==CAMST_WaitImg)&&(ov_line&0x01))
{
for(i=0;i>1][i]=(u16)(OV7670_LineBuf[i]&0xffff);
}
}
}