ad.asm

DSP芯片TMS320C5416实验程序

*************************************************************************
* AD/DA实验
* 将AD采样的数据直接输出到DA，用示波器检查输入信号和输出信号是否一致
*************************************************************************
			.mmregs

			.def CodeEntry
			.def Eint1_ISR

			.data
Data_DP:						
			
			.text
CodeEntry:			

			.copy "set_dp.asm"				;初始化DP，SP
			.copy "set_iptr.asm"			;初始化中断向量表

;Initialize the AD1571
K_STARTSEL	.set 1<<7	;D7	0:HARDWARE START 	1:SOFTWARE START
K_PROGEOC	.set 0<<6	;D6	0:INT				1:EOC
K_CLKSEL 	.set 0<<5	;D5	0:Internal Clock	1:External Clock
K_SWPWDN 	.set 0<<4	;D4	0:Normal			1:Power Down
K_MODESEL 	.set 0<<3	;D3	0:Single Channel	1:Sweep Mode
K_CR0       .set (K_STARTSEL|K_PROGEOC|K_CLKSEL|K_SWPWDN|K_MODESEL)<<5

K_OSCSPD 	.set 0<<6	;D6	0:INT.OSC.SLOW		1:INT. OSC. FAST
K_OUTCODE 	.set 0<<3	;D3	0:Binary			1:2s Complement
K_READREG 	.set 0<<2	;D2	0:Enable Self Test	1:Register Read back
K_STEST		.set 0		;0	CONVERSION result	READREG = 0
						;1	SELF TEST 1 result	
						;2	SELF TEST 2 result	
						;3	SELF TEST 3 result	
						;0	Contents of CR0		READREG = 1
						;1	Contents of CR1	
						
K_CR1		.set (100H|K_OSCSPD|K_OUTCODE|K_READREG|K_STEST)<<5			

DAC_DAT		.set 2200h
ADC_DAT		.set 2300h
						
			SSBX		INTM				;关闭中断
			STM			#0003H,IMR			;使能外部中断1
			STM			#0FFFFH,IFR			;清除未决的中断
			RSBX		INTM				;使能中断
	
			STM			#K_CR0,AR0			;设置AD1571初始化字
			STM			#K_CR1,AR1			;设置AD1571初始化字
			
			PORTW		*(10h),ADC_DAT		;初始化AD1571
			PORTW		*(11h),ADC_DAT		;初始化AD1571
			
LOOP:		NOP
			B 			LOOP

Eint1_ISR:
			PSHM		AR0					;保护AR0
			
			PORTR		ADC_DAT,*(10h)		;读取AD采样数据
			PORTW		*(10h),DAC_DAT		;将采样数据输出到DA
			NOP
			NOP
			POPM		AR0					;恢复AR0
			
			RETE
			
			.end