fm_drv.msa

来自「5807收音机模块用于炬力平台」· MSA 代码 · 共 195 行

         module   FM_I2CDRV
/******************************************************************
	FM Driver for C to call.
	by  Allen	20081023          V0.01
*******************************************************************/
//为3951准备的汇编与C的转接口
//==================================================================
public  FM_Init
public  FM_Exit
public  FM_SetFreq
public  FM_MUTE
public  FM_Standby
public  FM_Search
public  FM_GetStatus
public  FM_VolumeSet

extern  FM_INIT_Drv
extern  FM_EXIT_Drv
extern  FM_SETFREQ_Drv
extern  FM_SEARCH_Drv
extern  FM_SETMUTE_Drv
extern  FM_STANDBY_Drv
extern  FM_STEREO_Drv
extern  FM_GETSTATUS_Drv
extern  FM_VolumeSet_Drv
extern  FM_result
extern  WSET_XTAL
//==================================================================

    RSEG    FM_CTRL_D

buffer      defs    5   //方便I2C进行操作定义一个临时存放一些频率信息或其他操作命令的buffer
/*******************************************************************
Function prototype:
	bool FM_Init(m_FMPlaystatus.mode,SearchLevel)
INPUT:  1.Byte Bandmode(0x01=JP;0x00=US)
        2.Byte Searchlevel(default 0x0b)
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_Init:
        PUSH    DE
        PUSH    HL

        LD      HL,LWRD buffer
        LD      A,E                 //band info.
        LD      (HL),A
        INC     HL
        LD      A,C                 //search lev
        LD      (HL),A
        INC     HL
        LD	DE,LWRD WSET_XTAL
        LD	A,(DE)
        LD      (HL),A              //Crystal set
        INC	HL
        LD	(HL),A              //buffer byte4 clear
        INC	HL
        LD	(HL),A              //buffer byte5 clear
        LD      DE,LWRD buffer
        CALL    LWRD FM_INIT_Drv     //INitialization FM
        LD      A,(LWRD FM_result)

        POP     HL
        POP     DE
        RET
/*******************************************************************
Function prototype:
	FM_Exit();
INPUT:  
OUTPUT: 
*******************************************************************/
FM_Exit:
        PUSH    AF
        CALL    LWRD FM_EXIT_Drv     //disable bus

        POP     AF
        RET
/*******************************************************************
Function prototype:
	bool FM_SetFreq(Tempfreq<<6 +0x0010)
INPUT:  1.Word Tempfreq(US mode:0~210,the corresponding frequncy = Tempfreq*0.1+87 )
		       (JP mode:0~140,the corresponding frequncy = Tempfreq*0.1+76)
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_SetFreq:
        PUSH    DE
        PUSH    HL
        LD      HL,LWRD buffer      //buffer中为频率值，2byte buffer[E,D,...]
      	LD	(HL),E              //Low byte
        INC     HL
        LD      (HL),D              //High byte
        LD      DE,LWRD buffer
        CALL    LWRD FM_SETFREQ_Drv
        LD      A,(LWRD FM_result)
        POP     HL
        POP     DE
        RET
/*******************************************************************
Function prototype:
	FM_MUTE(para);
INPUT:  1.Byte para(0x00=mute 0x01 = release mute)
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_MUTE:
        PUSH   DE
        LD      A,E
        CALL    LWRD FM_SETMUTE_Drv
        LD      A,(LWRD FM_result)
        POP     DE
        RET
/*******************************************************************
Function prototype:
	FM_Standby(void);
INPUT:  
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_Standby:
        PUSH    DE
        LD      DE,LWRD buffer
        LD      A,00H
        LD      (DE),A
        CALL    LWRD FM_STANDBY_Drv
        LD      A,(LWRD FM_result)
        POP     DE
        RET
/*******************************************************************
Function prototype:
	FM_Search(Tempfreq<<6 +0x0010,Direct);
INPUT:  1.Word Tempfreq(US mode:0~210,the corresponding frequncy = Tempfreq*0.1+87 )
		       (JP mode:0~140,the corresponding frequncy = Tempfreq*0.1+76)
	2.Direct  search up or search down,0 = down;1= up
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_Search:
        PUSH    DE
        PUSH    HL
        LD      HL,LWRD buffer          //buffer中为频率值，2byte
        LD      (HL),E
        INC     HL
        LD      (HL),D
        INC     HL
        LD      A,C
        LD      (HL),A                  // Search direct

        LD      DE,LWRD buffer
        CALL    LWRD FM_SEARCH_Drv
        LD      A,(LWRD FM_result)
        POP     HL
        POP     DE
        RET
/*******************************************************************
Function prototype:
	FM_GetStatus(&d_FMStatus)
INPUT:  an address which you want to restore the data you have read
        from FM	
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_GetStatus:
        PUSH   DE
        LD      DE,LWRD buffer
        CALL    LWRD FM_GETSTATUS_Drv
        LD      HL,LWRD buffer

        POP     DE

        LD      A,(HL)
        LD      (DE),A
        INC     DE
        INC     HL
        LD      A,(HL)
        LD      (DE),A
        INC     HL
        INC     DE
        LD      A,(HL)
        LD      (DE),A
        LD      A,(LWRD FM_result)
        RET
/*******************************************************************
Function prototype:
	FM_VolumeSet((BYTE)param);
INPUT:  1.param volume level(0~31)	
OUTPUT: 1 = true;0 = false
*******************************************************************/
FM_VolumeSet:
        PUSH    DE
        LD      A,E
        LD      DE,LWRD buffer
        LD      (DE),A
        CALL    LWRD FM_VolumeSet_Drv
        LD      A,(LWRD FM_result)
        POP     DE
        RET
//==============================================
        END