iic24c02.c

sed1335液晶驱动,包括菜单,已经在DSPIC30F6014A上调试通过.

// 对24C02的读、写
// extern void DelayMs(unsigned int);
// extern void Read24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes);
// extern void Write24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes);
#include	"config.h" 
/***************************************************************************/
#define	IIC_DEVICE_ADDR_WRITE	0xa0
#define	IIC_DEVICE_ADDR_READ	0xa1

/***************************************************************************/

/***************************************************************************/
extern void DelayMs(unsigned int ) ;

/***************************************************************************/
void Start() 
{
	SDA=1;
	SCL=1;
	SDA=0;
	SCL=0;
}

/***************************************************************************/
void Stop() 
{
	SCL=0;
	SDA=0;
	SCL=1;
	SDA=1;
}

/***************************************************************************/
void Ack() 
{
	SDA=0;
	SCL=1;
	SCL=0;
	SDA=1;
}

/***************************************************************************/
void NoAck() 
{
	SDA=1;
	SCL=1;
	SCL=0;
}

/***************************************************************************/
BOOL TestAck() 
{
	BOOL ErrorBOOL;
	SDA=1;
	SCL=1;
	ErrorBOOL=SDA;
	SCL=0;
	return(ErrorBOOL);
}

/***************************************************************************/
BOOL Write8BOOL(unsigned char input) 
{
	unsigned char temp;
	for(temp=8;temp!=0;temp--) {
		SDA=(BOOL)(input&0x80);
		SCL=1;
		SCL=0;
		input=input<<1;
	}
	return TRUE;
}

/***************************************************************************/
void Write24c02(unsigned char *Wdata,unsigned char RomAddress,unsigned char number) 
{
	Start();
	Write8BOOL(IIC_DEVICE_ADDR_WRITE);
	TestAck();
	Write8BOOL(RomAddress);
	TestAck();
	for(;number!=0;number--) {
		Write8BOOL(*Wdata);
		TestAck();
		Wdata++;
	}
	Stop();
	DelayMs(10);
}

/***************************************************************************/
unsigned char Read8BOOL() 
{
	unsigned char temp,rbyte=0;
	for(temp=8;temp!=0;temp--) {
		SCL=1;
		rbyte=rbyte<<1;
		rbyte=rbyte|((unsigned char)(SDA));
		SCL=0;
	}
	return(rbyte);
}

/***************************************************************************/
void Read24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes) 
{
	//unsigned char temp;,rbyte
	Start();
	Write8BOOL(IIC_DEVICE_ADDR_WRITE);
	TestAck();
	Write8BOOL(RomAddress);
	TestAck();
	Start();
	Write8BOOL(IIC_DEVICE_ADDR_READ);
	TestAck();
	while(bytes!=1) {
	*RamAddress=Read8BOOL();
	Ack();
	RamAddress++;
	bytes--;
	}
	*RamAddress=Read8BOOL();
	NoAck();
	Stop();
}