OV7740 STM32 source code

/* Includes ------------------------------------------------------------------*/  

#include "stm32f10x.h"  

#include "stm32f10x_exti.h"  

#include "OV7740.h"  

#include "OV7740Reg.h"  

#include "sccb.h"  

#include "misc.h"  

#include "delay.h"  

/* Private define ------------------------------------------------------------*/  

#define OV7740_HREF_BIT     GPIO_Pin_2  

#define OV7740_VSYNC_BIT    GPIO_Pin_4  

#define GPIO_PIN_PCLK       GPIO_Pin_1  

#define GPIO_PIN_REST       GPIO_Pin_5  

#define GPIO_PIN_XCLK       GPIO_Pin_8  

#define GPIO_PCLK_PORT      GPIOB  

#define GPIO_VSYNC_CMOS                    GPIOB  

#define RCC_APB2Periph_GPIO_VSYNC_CMOS     RCC_APB2Periph_GPIOB  

#define GPIO_PIN_VSYNC_CMOS                GPIO_Pin_4//GPIO_Pin_4  

#define EXTI_LINE_VSYNC_CMOS EXTI_Line4//EXTI_Line4  

#define GPIO_PORT_SOURCE_VSYNC_CMOS        GPIO_PortSourceGPIOB  

#define GPIO_PIN_SOURCE_VSYNC_CMOS         GPIO_PinSource4//GPIO_PinSource14  

#define HREF_H GPIOB->BSRR = GPIO_Pin_2  //  

#define HREF_L GPIOB->BRR = GPIO_Pin_2  //  

#define XCLK_H GPIOA->BSRR = GPIO_Pin_8  

#define XCLK_L GPIOA->BRR =  GPIO_Pin_8  

#define CAMRST_H  GPIOB->BSRR  = GPIO_Pin_5  

#define CAMRST_L  GPIOB->BRR  = GPIO_Pin_5  

/* Private variables ---------------------------------------------------------*/  

/* Private functions ---------------------------------------------------------*/  

void OV7740_XCLK_ON(void)  

{  

    GPIO_InitTypeDef GPIO_InitStructure;  

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;   

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP ;   

    GPIO_Init(GPIOA, &GPIO_InitStructure);  

    RCC_MCOConfig(RCC_MCO_HSE); //hsi //Output clock source on the specified pin PA8  

}  

void OV7740_GPIO_Init(void)  

{    

GPIO_InitTypeDef GPIO_InitStructure;  

GPIO_InitStructure.GPIO_Pin =  OV7740_VSYNC_BIT;  

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  

GPIO_Init(GPIOB, &GPIO_InitStructure);   

GPIO_InitStructure.GPIO_Pin =  OV7740_HREF_BIT|GPIO_PIN_REST;  

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  

GPIO_Init(GPIOB, &GPIO_InitStructure);  

}  

void OV7740_Interrupts_Config(void)  

{  

NVIC_InitTypeDef NVIC_InitStructure;  

NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;  

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //Sub-priority  

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  

NVIC_Init(&NVIC_InitStructure);  

}  

void OV7740_EXTI_Config(void)     //  

{  

EXTI_InitTypeDef EXTI_InitStructure;  

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource4);  

EXTI_InitStructure.EXTI_Line = EXTI_Line4;  

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;  

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  

EXTI_InitStructure.EXTI_LineCmd = ENABLE;  

EXTI_Init(&EXTI_InitStructure);  

EXTI_GenerateSWInterrupt(EXTI_Line4);  

}  

u8 OV7740_writeReg(u8 regID, u8 regDat)  

{  

while(SCCB_Start() ==0);  

if(0==SCCB_writeByte(SCCB_7740_WRADDR))  

{  

SCCB_Stop();  

return(0);  

}  

  if(0==SCCB_writeByte(regID))  

{  

SCCB_Stop();  

return(0);  

}  

  if(0 == SCCB_writeByte(regDat))  

{  

SCCB_Stop();  

return(0);  

}  

  SCCB_Stop();  

  return(1);   

}  

u8 OV7740_readReg(u8 regID, u8 *regDat)  

{  

//Set the register address through write operation  

while(SCCB_Start() ==0);  

if(0==SCCB_writeByte(SCCB_7740_WRADDR))  

{  

SCCB_Stop();  

return(0);  

}  

  if(0 == SCCB_writeByte(regID))  

{  

SCCB_Stop();  

return(0);  

}  

SCCB_Stop();  

//After setting the register address, read  

while(SCCB_Start() == 0);  

if(0==SCCB_writeByte(SCCB_7740_RDADDR))  

{  

SCCB_Stop();  

return(0);  

}  

  *regDat = SCCB_readByte();  

  SCCB_Stop();  

  return(1);  

}  

u8 OV7740_init(void)  

{  

int i,n;  

u8 val;  

SCCB_GPIO_Init();  

OV7740_GPIO_Init();  

OV7740_XCLK_ON();  

  CAMRST_L;  

  delay_us(100);  

CAMRST_H;  

delay_us(100);  

if(0 == OV7740_writeReg(SCCB_REG12,0x80)) return 0;  

Delay_ms(10);    

if(0 == OV7740_writeReg(SCCB_REG12,0x51)) return 0;  

    delay_us(10);  

OV7740_readReg(0x0A,&val);  

n = sizeof(RegConf0)/sizeof(UINT8);   

for(i=0;i

{   

if(0 == OV7740_writeReg(RegConf0[i][0],RegConf0[i][1]))  

{   

return 0;  

}  

delay_us(10);  

}  

OV7740_setExposure(15);  

OV7740_setGainVal(0);  

OV7740_setVWindow(230);  

OV7740_Interrupts_Config();  

OV7740_EXTI_Config();  

return 1;  

}  

void OV7740_setGainVal(int x)  

{  

//OV7740_readReg(0x15,&val);  

OV7740_writeReg(0x00,Testgain[x][0]);  

OV7740_writeReg(0x15,Testgain[x][1]);  

}  

void OV7740_setExposure(int exposure)  

{  

OV7740_writeReg(0x10,exposure&0xff);  

OV7740_writeReg(0x0f,(exposure>>8)&0xff);  

}  

u8 setGain(int macro,int micro)  

{  

    u8 getGain[8]={7,0,1,3,7,15,31,63};  

    u8 r00,r15;  

/*if(macro ==0) {OV7740_writeReg(0x13,0x87);return 0;}*/  

    if (macro>7) return 0;  

    if (micro>15) return 0;   

    r15 = getGain[macro]>>4;  

    r00 = (getGain[macro]<<4)+micro;  

/*OV7740_writeReg(0x13,0x00);manual modification*/  

    OV7740_writeReg(0x00,r00);  

    if (r15) OV7740_writeReg(0x15,r15);  

    return 1;  

}  

//even for startline  

void OV7740_setVWindow(int startline)  

{  

    OV7740_writeReg(0x19,startline>>1);  

    OV7740_writeReg(0x1a,(20>>1)); //20lines, >>1  

}  

void OV7740_setLines(int lines)  

{  

OV7740_writeReg(0x1a,(lines>>1)); //20lines, >>1  

}  

u8 OV7740_test(void)  

{  

SCCB_GPIO_Init();  

OV7740_GPIO_Init();  

OV7740_XCLK_ON();  

CAMRST_L;  

delay_us(100);  

CAMRST_H;  

delay_us(100);  

if(0 == OV7740_writeReg(0x12,0x80)) return 0;  

delay_us(10);  

if(0 == OV7740_writeReg(0x12,0x40)) return 0;  

delay_us(10);  

  OV7740_setVWindow(230);  

if(0 == OV7740_writeReg(SCCB_REG38,0x07) )return 0;  

delay_us(10);  

if(0 == OV7740_writeReg(0x84,0x02) )return 0;  

delay_us(10);  

if(0 == OV7740_writeReg(SCCB_REG38,0x08)) return 0;  

delay_us(10);  

if(0 == OV7740_writeReg(0x84,0x07)) return 0;  

delay_us(10);  

OV7740_Interrupts_Config();  

OV7740_EXTI_Config();  

return 1;  

}