test_ov9650.c

基于s3c2440的摄像头和lcd接口的底层代码

#include "2440addr.h"

#define	CLKCON					rCLKCON
#define	UPLLCON					rUPLLCON
#define	CLKDIVN					rCLKDIVN
#define	CAMDIVN					rCAMDIVN

#define MAKE_HIGH(x) (rGPEDAT |= 1<<(x))
#define MAKE_LOW(x)  (rGPEDAT &= ~(1<<(x)))

#define CHIP_DELAY 0xFF
#define OV9650_REGS (sizeof(ov9650_reg)/sizeof(ov9650_reg[0]))

static struct ov7620
{
	int subaddr;
	int value;
} 

ov9650_reg[] = 
{
{0x12, 0x80},
{CHIP_DELAY, 10},
{0x11,0x80},{0x6a,0x3e},{0x3b,0x09},{0x13,0xe0},{0x01,0x80},{0x02,0x80},{0x00,0x00},{0x10,0x00},
{0x13,0xe5},{0x39,0x43},{0x38,0x12},{0x37,0x00},{0x35,0x91},{0x0e,0xa0},{0x1e,0x04},{0xA8,0x80},
{0x12,0x40},{0x04,0x00},{0x0c,0x04},{0x0d,0x80},{0x18,0xc6},{0x17,0x26},{0x32,0xad},{0x03,0x00},
{0x1a,0x3d},{0x19,0x01},{0x3f,0xa6},{0x14,0x2e},{0x15,0x10},{0x41,0x02},{0x42,0x08},{0x1b,0x00},
{0x16,0x06},{0x33,0xe2},{0x34,0xbf},{0x96,0x04},{0x3a,0x00},{0x8e,0x00},{0x3c,0x77},{0x8B,0x06},
{0x94,0x88},{0x95,0x88},{0x40,0xc1},{0x29,0x3f},{0x0f,0x42},{0x3d,0x92},{0x69,0x40},{0x5C,0xb9},
{0x5D,0x96},{0x5E,0x10},{0x59,0xc0},{0x5A,0xaf},{0x5B,0x55},{0x43,0xf0},{0x44,0x10},{0x45,0x68},
{0x46,0x96},{0x47,0x60},{0x48,0x80},{0x5F,0xe0},{0x60,0x8c},{0x61,0x20},{0xa5,0xd9},{0xa4,0x74},
{0x8d,0x02},{0x13,0xe7},{0x4f,0x3a},{0x50,0x3d},{0x51,0x03},{0x52,0x12},{0x53,0x26},{0x54,0x38},
{0x55,0x40},{0x56,0x40},{0x57,0x40},{0x58,0x0d},{0x8C,0x23},{0x3E,0x02},{0xa9,0xb8},{0xaa,0x92},
{0xab,0x0a},{0x8f,0xdf},{0x90,0x00},{0x91,0x00},{0x9f,0x00},{0xa0,0x00},{0x3A,0x01},{0x24,0x70},
{0x25,0x64},{0x26,0xc3},{0x2a,0x00},{0x2b,0x00},{0x6c,0x40},{0x6d,0x30},{0x6e,0x4b},{0x6f,0x60},
{0x70,0x70},{0x71,0x70},{0x72,0x70},{0x73,0x70},{0x74,0x60},{0x75,0x60},{0x76,0x50},{0x77,0x48},
{0x78,0x3a},{0x79,0x2e},{0x7a,0x28},{0x7b,0x22},{0x7c,0x04},{0x7d,0x07},{0x7e,0x10},{0x7f,0x28},
{0x80,0x36},{0x81,0x44},{0x82,0x52},{0x83,0x60},{0x84,0x6c},{0x85,0x78},{0x86,0x8c},{0x87,0x9e},
{0x88,0xbb},{0x89,0xd2},{0x8a,0xe6}
};

static unsigned char sccb_id = 0x60;

void Delay(unsigned char time)
{
    unsigned int val = 511;
	
	rTCFG0 &= ~(0xff<<8);
	rTCFG0 |= 3<<8;			//prescaler = 3+1
	rTCFG1 &= ~(0xf<<12);
	rTCFG1 |= 0<<12;		//mux = 1/2

	rTCNTB3 = val;
	rTCMPB3 = val>>1;		// 50%
	rTCON &= ~(0xf<<16);
	rTCON |= 0xb<<16;		//interval, inv-off, update TCNTB3&TCMPB3, start timer 3
	rTCON &= ~(2<<16);		//clear manual update bit
	while(time--) 
	{
		while(rTCNTO3>=val>>1);
		while(rTCNTO3<val>>1);
	}
}

static void CamModuleReset(void)
{
	rCIGCTRL |= (1<<30);
	Delay(2);
	rCIGCTRL &= ~(1<<30);
	Delay(2);
}

void __inline ov7620_sccb_start(void)
{
	MAKE_HIGH(14);
	MAKE_HIGH(15);
	Delay(2);
	MAKE_LOW(15);
	Delay(2);
	MAKE_LOW(14);
	Delay(2);
}

void __inline ov7620_sccb_end(void)
{
	MAKE_LOW(15);
	Delay(2);
	MAKE_HIGH(14);
	Delay(2);
	MAKE_HIGH(15);
	Delay(2);
}

void __inline ov7620_sccb_write_bit(unsigned char bit)
{
	if (bit)
		MAKE_HIGH(15);
	else
		MAKE_LOW(15);
	Delay(2);
	MAKE_HIGH(14);
	Delay(2);
	MAKE_LOW(14);
	Delay(2);
}

void __inline ov7620_sccb_writechar(unsigned char data)
{
	int i = 0;

	for (i = 0; i < 8; i++ ) {
		ov7620_sccb_write_bit(data & 0x80);
		data <<= 1;
	}
	ov7620_sccb_write_bit(1);
}

static void ov7620_sccb_sendbyte(unsigned char subaddr, unsigned char data)
{
	ov7620_sccb_start();
	ov7620_sccb_writechar(sccb_id);
	ov7620_sccb_writechar(subaddr);
	ov7620_sccb_writechar(data);
	ov7620_sccb_end();

	Delay(10);
}

void __inline ov7620_init(void)
{
    rGPECON &= ~(15<<28);
    rGPECON |= (5<<28);
    rGPEUP  |= (3<<14);
	Delay(10);
}

void __inline ov7620_config(void)
{
	int i;

	for(i = 0; i < OV9650_REGS; i++) 
	{
	   if(ov9650_reg[i].subaddr == CHIP_DELAY)
		  Delay(ov9650_reg[i].value);
	   else
		  ov7620_sccb_sendbyte(ov9650_reg[i].subaddr & 0xff,ov9650_reg[i].value & 0xff);
	}

}

void __inline s3c2440_camif_init(void)
{
    rUPLLCON = (56<<12)|(2<<4)|1;
    CLKDIVN |= (1<<3);
    CAMDIVN = (1<<4)|(1&0xf);
}



void Test_OV9650(void)
{	
	s3c2440_camif_init();
	CamModuleReset();
	ov7620_init();
	ov7620_config();
}

void CamPortSet(void)
{
	rGPJCON = 0x2aaaaaa;
	rGPJDAT = 0;
	rGPJUP = 0;

	rGPGCON &= ~(3<<24);
	rGPGCON |= 1<<24;
	rGPGUP  |= 1<<12;
	rGPGDAT &= ~(1<<12);
}

void CamReset(void)
{
	rCIGCTRL |= (1<<31);
	Delay(5);
	rCIGCTRL &= ~(1<<31);
}