ad_da.asm

TI 5000系列

*********************************************************
*                    ADS805								*
* 1.本程序实现ADS805的调试，以测试其采样频率等。        *
* 2.ADS805的采样频率10K--20M.本程序调试过程中使用1M     *
* 3.使用的信号是100K的方波，正弦波。					*
*                                                       *
* Author:  YangSS                                       *
* Version: v3                            Date: 05\12\2  *
*********************************************************
	  	  .title		"AD_DA"
	   	  .mmregs 
	   	  .def  		_c_int00
	   	  .include     "Ads805.h"
	   	
temp	  .usect		"temp",		1   	
output	  .usect		"output",	1000H		   	
    	  .text 
*********************************************************
*   Interrupt table Configure the necessary interrupt   *
*                                                       *
*********************************************************
          .align     0x80
_c_int00:     
		  B      	  Start          ;RESET        
          NOP
          NOP
          .space      22*4*16
TINT0:     
		  ret   
		  ;B         Receive      
          NOP
          NOp
          .space     5*4*16
          
*********************************************************
*     Main Function for the ADS805 debug				*
*														*
*********************************************************        
              	
Start:      	
                
		 STM 		#1000h,	SWWSR	  ;I/O  wait 1 clk
	  	 STM 		#00a0h,	PMST
		 SSBX 		INTM               					
       	 STM  		#00H, IMR
         STM  		#3FFFH,	IFR		  ;Clear all the 
       	 STM		#8000H,	GPIOCR    ;Interrupt
         CALL		Dsp100M

                                  
*********************************************************
*      TIMER interrupt									*
*  1.Configure the divided frequency for sampling       *
*  2.Here the divide coefficient 2*5.                   *
*********************************************************             	                                 							   
TIME0:         	
	   	 STM		#010100100100b,	TCR0                     	
       	 STM		#01h, PRD0
       	 STM 		#3FFFH,	IFR
         STM		#010100100100b,	TCR0
       	 NOP
       	 NOP
       	 NOP
         
         ; Configure the sampling start
       	 RPT         #22
		 NOP
		 
		 
*************************************************
*	FUNCTION :	Receive 						*
*  PARAMETRES;  NONE							*
*  PURPOSE   :  RECEIVE THE DIGITAL(12 bits)	*
*				THROUGH ADS805.                 *
*************************************************	
		
       	 STM		#temp, AR3
       	 STM		#1000h,	AR4
       	 STM		#output, AR2			
		
		 ; Sample 1500h data
		 ST		 #1500h,	BRC
         RPTB	 SamFin-1		
Receive:   
        
         PORTR		2000h,*AR3		 ;2
         RPT		#3               ;6
         NOP     		     	 	  
         MVDD    	*AR3, *AR2+      ;1
         RPT		#7				 ;9
         NOP
         
         ; Configure the sample interval for specifical purpose
         ;rpt       #18				 ;20
         ;nop  
         ;rpt       #18				 ;20
         ;nop  
         ;b  		Receive
       
SamFin:
         STM		#output, AR2
         ST			#1500h,	BRC
         RPTB	 	Finish-1
         
DataDeal:                            ;

		 LD			*AR2, A
		 AND		#1FFFh, A
		 NOP
		 NOP
		 NOP
		 NOP
		 STL		A, *AR2+
		 NOP
		 NOP
Finish:          
       	 B  		Finish

******************************************************
* 	FUNCTION:  DspXM								 *
*	PARAMETRE: NONE									 *	
*   PURPOSE :  CONFIGURE THE CLOCKS FOR DSP.         *
******************************************************
Dsp100M:
		 STM		#0000h,CLKMD
F100M:
		 LDM		CLKMD,A
		 AND		#01h,A
		 BC		    F100M,ANEQ
	 	 STM		#10EFh,CLKMD      ;Configure DSP clkout 
		 RPT		#100
		 NOP
		 RET
		.end