lfdips.asm

北京瑞泰公司DSP2407-A的I/O测试程序

;*********************************************************************
; File Name:     lfdips.asm
; Target System: C24x Evaluation Board
;
; Description:   This sample program demonstrates fetching data from
;                I/O space from the DIP switches and then sending the			
;                data back to I/O space to the LEDs on the F240
;                EVM Development Board
;
;                The state of the LED (ON/OFF) reflects the state of
;                the corresponding DIP switch.
;
; Revision:      1.00
;
;*********************************************************************
		.include	240x.h
;---------------------------------------------------------------------
; I/O Mapped EVM Register Declarations
;---------------------------------------------------------------------
SWITCHES	.set    0008h		;DIP Switch Register
LEDS      	.set    000Ch		;LEDs Register
temp		.set	8000h

;---------------------------------------------------------------------
; Variable Declarations for on chip RAM Blocks
;---------------------------------------------------------------------
			.bss	GPR0,1		;General purpose register.
			.bss	LED_STATUS,1	;LED Status Register
			.bss	SW_STATUS,1		;DIP Switch Status Register

;===========================================================================================
; V E C T O R    T A B L E    ( including RT monitor traps )
;===========================================================================================
 
        	.copy		"vector.h" 
 
;==========================================================================================
; M A I N   C O D E  - starts here
;==========================================================================================
			.text
START:  LDP		#0h
		SETC	INTM			;Disable interrupts
		SETC	CNF
		SPLK	#0h, IMR		;Mask all INTs
		LACC	IFR				;Read Interrupt flags
		SACL	IFR				;Clear all interrupt flags

		CLRC	SXM			;Clear Sign Extension Mode
		CLRC	OVM			;Reset Overflow Mode
		CLRC	CNF			;Config Block B0 to Data mem.   
		 
		LDP		#00E0h 
        SPLK	#0285h, SCSR1	; x2 PLL, ADC en, EV1 en, clr Ill Addr flg		

		SPLK	#006Fh, WDCR 	;Disable WD if VCCP=5V
		KICK_DOG

		SPLK	#0h, GPR0	;Set 1 wait states for I/O space
		OUT		GPR0, WSGR



LOOP	IN		SW_STATUS,SWITCHES	;Get the status of each DIP switch
		LACC	SW_STATUS			;Load the status into the accumulator
		SACL	LED_STATUS			;Store the DIP status into the LEDs status
		OUT		LED_STATUS,LEDS		;Output the DIP status to the LEDS
		B		LOOP				;  A DIP that is on will turn on the 
							;  corresponding LED
							;  A DIP that is off will turn off the
							;  corresponding LED

;=====================================================================
; I S R  -  PHANTOM
;
; Description:	Dummy ISR, used to trap spurious interrupts.
;
; Modifies:	Nothing
;
; Last Update:	16 June 95
;=====================================================================
PHANTOM 	KICK_DOG				;Resets WD counter
		B	PHANTOM