video_switch.c

一款车载DVD的车机源程序（正在生成中的哦）

/***************************************************************************
Project  :  Car two ting dvd System
Compiler :  ST7 HiCross C (HiWARE)
Module   :  autos.c 
Version  :  V 1.0
Created  :  24 11, 2005
Author   :  tomi / SA
Description
         -  Use the M52795 to selete the video input source. 
         -  Use the NJM2245 to selete the AV1/AV2/CAM video input source
Modified
		 - tomi
***************************************************************************/
#include "Video_switch.h"
#include "Libr.h"
#include "St72321.h"
#include "IOport.h"
#include "Sys_config.h"
#include "i2c_drv.h"
#include "System_operation.h"

static unsigned char Video_sw_data1 = 0xc0;	//default state:aduio is normal and D4/D5 are hi
static unsigned char Video_sw_data2 = 0xc0;	//default state:aduio is normal and D4/D5 are hi
void Select_video_input_source(unsigned char Input_source);
void Selete_AV1_AV2_CAM_video_input_source(unsigned char Input_source);


void Select_video_input_source(unsigned char Input_source)
{
	Video_sw_data1 = Video_sw_data1 & 0xfc;
	Video_sw_data2 = Video_sw_data2 & 0xfc;
	
	Video_sw_data1 = Video_sw_data1 |Input_source;
	Video_sw_data2 = Video_sw_data2 |Input_source;

	if(ValBit(System_flag,Video_gain_6db_flag))
		{	//Video gain 6db
		SetBit(Video_sw_data1,3);
		SetBit(Video_sw_data2,3);
		}
	else
		{	//Video gain 0db
		ClrBit(Video_sw_data1,3);
		ClrBit(Video_sw_data2,3);
		}
	I2CWriteByte(Video_sw_address,Video_sw_data1,Video_sw_data2);
}

/*****************************************************************
Function:Use the NJM2245 to selete the AV1/AV2/CAM video input source
*****************************************************************/
void Selete_AV1_AV2_CAM_video_input_source(unsigned char Input_source)
{
	switch(Input_source)
		{
		case AV1_video_input:
			Set_SEL_2533_1_low;
			Set_SEL_2533_2_low;
			break;
		case AV2_video_input:
			Set_SEL_2533_1_high;
			Set_SEL_2533_2_low;
			break;
		case CAM_video_input:
			Set_SEL_2533_1_low;
			Set_SEL_2533_2_high;
			break;
		}
}