音量控制M62446的驱动C程序

音量控制M62446的驱动C程序音量控制M62446 m62446 pdf//-------------------------------------------------------------------------// M62446 drving routines, VER 1.0//// COPYRIGHT (C) 2000, Enbia Technology Inc.// Target: 8031// AUTHOR: STEVEN LUO//// Revision History:// 2001/1/5 - Original Version////-------------------------------------------------------------------------#include <reg51.h>#include <types.h>#include <intrins.h>#include <bin.h>extern BOOL PIN_M62446_LATCH;extern BOOL PIN_M62446_DATA;extern BOOL PIN_M62446_CLK;static idata WORD shadow_word00=0;static idata WORD shadow_word01=0;static idata WORD shadow_word10=0;static idata WORD shadow_word11=0; // for storing the control word status // static BOOL bM62446Muted; // Set when 62446 is mutedstatic void Write_M62446_Word(WORD myword);//-------------------------------------------------------------------------// Name: Volume_Validate// Description:// Arguments:// Return value: none//-------------------------------------------------------------------------static BYTE Volume_Validate(char vol){if(vol<0)vol=0; // negative, should be 0else if(vol >80) vol=80; // >80, set to 80return 80 - vol; // Down to Up}//-------------------------------------------------------------------------// Name: Mute_M62446// Description:// Arguments:// Return value: none//-------------------------------------------------------------------------void Mute_M62446(void){Write_M62446_Word(0xa141); // B1010000 1010000 01, B10100001_01000001Write_M62446_Word(0xa142);Write_M62446_Word(0xa143);bM62446Muted = 1;}//-------------------------------------------------------------------------// Name: UnMute_M62446// Description:// Arguments:// Return value: none//-------------------------------------------------------------------------void UnMute_M62446(void){shadow_word01&=0xfffc; shadow_word01|=0x01; Write_M62446_Word(shadow_word01); shadow_word10&=0xfffc; shadow_word10|=0x02; Write_M62446_Word(shadow_word10); shadow_word11&=0xfffc; shadow_word11|=0x03; Write_M62446_Word(shadow_word11);bM62446Muted = 0;}//-------------------------------------------------------------------------// Name: Write_M62446_Left// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//-------------------------------------------------------------------------void Write_M62446_Left(char vol){WORD temp;temp=Volume_Validate(vol);temp<<=9;shadow_word01&=0x01ff;shadow_word01|=temp;// DE=0;DF=1;shadow_word01&=0xfffc; shadow_word01|=0x01;if (bM62446Muted) return;Write_M62446_Word(shadow_word01);}//-------------------------------------------------------------------------// Name: Write_M62446_Right// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//-------------------------------------------------------------------------void Write_M62446_Right(char vol){WORD temp;temp=Volume_Validate(vol);temp<<=2;shadow_word01&=0xfe03;shadow_word01|=temp;// DE=0;DF=1;shadow_word01&=0xfffc; shadow_word01|=0x01;if (bM62446Muted) return;Write_M62446_Word(shadow_word01);}//-------------------------------------------------------------------------// Name: Write_M62446_Center// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//------------------------------------------------------------------------- void Write_M62446_Center(char vol){WORD temp;temp=Volume_Validate(vol);temp<<=9;shadow_word10&=0x01ff;shadow_word10|=temp;// DE=1;DF=0;shadow_word10&=0xfffc; shadow_word10|=0x02;if (bM62446Muted) return;Write_M62446_Word(shadow_word10);}//------------------------------------------------------------------------- // Name: Write_M62446_SubWoofer// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//------------------------------------------------------------------------- void Write_M62446_SubWoofer(char vol){WORD temp;temp=Volume_Validate(vol);temp<<=2;shadow_word10&=0xfe03;shadow_word10|=temp;// DE=1;DF=0;shadow_word10&=0xfffc; shadow_word10|=0x02;if (bM62446Muted) return;Write_M62446_Word(shadow_word10);}//------------------------------------------------------------------------- // Name: Write_M62446_SurLeft// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//------------------------------------------------------------------------- void Write_M62446_SurLeft(char vol){WORD temp;temp=Volume_Validate(vol);temp<<=9;shadow_word11&=0x01ff;shadow_word11|=temp;// DE=1;DF=1;shadow_word11&=0xfffc; shadow_word11|=0x03;if (bM62446Muted) return;Write_M62446_Word(shadow_word11);}//------------------------------------------------------------------------- // Name: Write_M62446_SurRight// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//------------------------------------------------------------------------- void Write_M62446_SurRight(char vol){WORD temp;temp=Volume_Validate(vol);temp<<=2;shadow_word11&=0xfe03;shadow_word11|=temp;// DE=1;DF=1;shadow_word11&=0xfffc; shadow_word11|=0x03;if (bM62446Muted) return;Write_M62446_Word(shadow_word11);}static BYTE code Treble_Bass_TAB[11]={0x0e, // 0, -10db0x0c, // 1, -8db0x0b, // 2, -6db0x0a, // 3, -4db0x09, // 4, -2db0x00, // 5, 0db0x01, // 6, +2db0x02, // 7, +4db0x03, // 8, +6db0x04, // 9, +8db0x06 // 10, +10db};//-------------------------------------------------------------------------// Name: Write_M62446_Treble// Description: This function Write 2 bytes to M62446// Arguments: 0-20,// 0: -10db// 10: 0db// 20 +10db// Return value: none//------------------------------------------------------------------------- void Write_M62446_Treble(BYTE Treble){WORD temp;Treble=Treble_Bass_TAB[Treble];temp=Treble;temp<<=12;shadow_word00&=0x0fff;shadow_word00|=temp;// DE=0;DF=0;shadow_word00&=0xfffc;Write_M62446_Word(shadow_word00);}//-------------------------------------------------------------------------// Name: Write_M62446_Bass// Description: This function Write 2 bytes to M62446// Arguments: 0-20,// 0: -10db// 10: 0db// 20 +10db// Return value: none//------------------------------------------------------------------------- void Write_M62446_Bass(BYTE Bass){WORD temp;Bass=Treble_Bass_TAB[Bass];temp=Bass;temp<<=4;shadow_word00&=0xff0f;shadow_word00|=temp;// DE=0;DF=0;shadow_word00&=0xfffc;Write_M62446_Word(shadow_word00);}//-------------------------------------------------------------------------// Name: Write_M62446_Bypass// Description: This function Write 2 bytes to M62446// Arguments: 1, bypass on, 0: off// Return value: none//-------------------------------------------------------------------------void Write_M62446_Bypass(BOOL bOnOff){if (bOnOff) shadow_word00 |= 0x0004; // Onelse shadow_word00 &= 0xfffb; // off// DE=0;DF=0;shadow_word00 &= 0xfffc;Write_M62446_Word(shadow_word00);}//-------------------------------------------------------------------------// Name: Write_M62446_Output// Description: This function Write 2 bytes to M62446// Arguments: port=1-4, BYTE=1 or 0// Return value: none//-------------------------------------------------------------------------void Write_M62446_Output(BYTE port, BOOL bOnoff){WORD temp, mask=1;temp=bOnoff;temp <<= (12-port);mask <<= (12-port);shadow_word00&=~mask;shadow_word00|=temp;// DE=0;DF=0;shadow_word00&=0xfffc;Write_M62446_Word(shadow_word00);}#define DELAY() {_nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();_nop_(); _nop_();_nop_(); _nop_();}//-------------------------------------------------------------------------// Name: Write_M62446_Word// Description: This function Write 2 bytes to M62446// Arguments:// Return value: none//-------------------------------------------------------------------------static void Write_M62446_Word(WORD myword){register BYTE i;PIN_M62446_LATCH=0;for (i=16;i>0;--i){if(myword & 0x8000) PIN_M62446_DATA=1; // MSB firstelse PIN_M62446_DATA=0;myword<<=1; // Rotate RightDELAY();PIN_M62446_CLK=1;DELAY();PIN_M62446_CLK=0;}DELAY();PIN_M62446_LATCH=1;}。