r2s15902.c

R2S15902音频IC I2C初始化 用于音响、车载等

/****************************************************************
*                      MT View Silicon Tech. Inc.
*    Copyright 2005, MT View Silicon Tech. Inc., ShangHai, China
*                    All rights reserved.
*
* Filename:      	R2S15902.c
* Programmer:    	Grey
* Created: 	 		01/xx/2006
* Description: 		R2S15902 audio control operation function file
*        
* Change History (most recent first):	
****************************************************************/
#include <reg51.h>
#include "type.h"
#include "utility.h"

#include "R2S15902.h"


/* Internal I2C protocol */
/*declare I2C port and pins*/
#define PORT		P3
#define	SCL 		0x01		//= P3^0
#define	SDA 		0x02		//= P3^1

/*define pin operate macro*/
#define SET_PIN(reg, mask)		((reg) |= (mask))			//pin = 1
#define	CLR_PIN(reg, mask)		((reg) &= (~(mask)))		//pin = 0
#define GET_PIN(reg, mask)		((reg) & (mask))			//get pin status

/*set SCL rate: 100Kbps~400Kbps*/
#define I2C_TIME	1				//EX51 -> 100 us/bit
									//I51 -> 10 us/bit

BYTE CODE	R2S15902_INIT_DATA[12] = {0x03,0x02,0x00,0xc0,0x03,0x8f,0xc0,0x03,0x4f,0xc0,0x03,0xcf};
BYTE 	R2S15902_DATA[12];
//
// I2C start condition: SCL = 1, SDA 1->0
//
static void 
I2CStart(void)
{
     CLR_PIN(PORT, SDA); 
     WaitUs(I2C_TIME);
     CLR_PIN(PORT, SCL);
     WaitUs(0);
}

//
// I2C stop condition: SCL = 1, SDA  0->1
//
static void 
I2CStop(void)
{
//     CLR_PIN(PORT, SCL);
//     WaitUs(I2C_TIME);

     SET_PIN(PORT, SDA);
     WaitUs(I2C_TIME);
     SET_PIN(PORT, SCL);
     WaitUs(I2C_TIME);
     CLR_PIN(PORT, SCL);
     WaitUs(I2C_TIME);	
     CLR_PIN(PORT, SDA);
     WaitUs(I2C_TIME);
     SET_PIN(PORT, SCL);
     WaitUs(I2C_TIME);
     CLR_PIN(PORT, SCL);

}


//
// I2C write 8 bits to device
//
static bit 						//if error return 1, else return 0
I2CWrite8Bit(
unsigned char b				//data to write into device
	)
{
	unsigned char temp;
	 
	for(temp=8; temp!=0; temp--)
	{
		CLR_PIN(PORT, SCL);
		WaitUs(I2C_TIME);
		if(b & 0x01)				//MSB output first
		{
		  	SET_PIN(PORT, SDA);
		}
		else
		{
			CLR_PIN(PORT, SDA);
		} 
		WaitUs(I2C_TIME);
		SET_PIN(PORT, SCL);
		WaitUs(I2C_TIME);
		b = b >> 1;
	}
	//CLR_PIN(PORT, SCL);
	return 0;
}
/* Internal I2C protocol */



//
// R2S15902 set multi registers
//
extern bit								//if succeed return 0, else return 1
R2S15902SetReg(void)
{
	unsigned char 	i;
	
	I2CStart();
	for(i = 0; i < 3; i++)
	{
		I2CWrite8Bit(R2S15902_DATA[i]);			
	}	
	I2CStop();	
	for(i = 3; i < 6; i++)
	{
		I2CWrite8Bit(R2S15902_DATA[i]);		
	}	
	I2CStop();		
	for(i = 6; i < 9; i++)
	{
		I2CWrite8Bit(R2S15902_DATA[i]);			
	}	
	I2CStop();	
	for(i = 9; i < 12; i++)
	{
		I2CWrite8Bit(R2S15902_DATA[i]);
		
	}	
	I2CStop();		
	return 0;
}

//
// Initial R2S15902 port
//
extern void
R2S15902Init(void)
{
	SET_PIN(PORT, SDA | SCL);
}


//extern BYTE	gAddOnFlag;				//record add-on module connection status
	
	
//
// Audio initial
//
extern void
AudioInit(
	void
	)
{
	unsigned char 	i;
	for(i = 0; i < 12; i++)
	{
		R2S15902_DATA[i]=R2S15902_INIT_DATA[i];		
	}
	R2S15902Init();

	if(R2S15902SetReg())
		return;
}