;*********************************************************************
; File Name:     dips.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	f240regs.h

;---------------------------------------------------------------------
; I/O Mapped EVM Register Declarations
;---------------------------------------------------------------------
DAC0     	.set    0000h		;DAC Channel 0 Register
DAC1     	.set    0001h		;DAC Channel 1 Register
DAC2     	.set    0002h		;DAC Channel 2 Register
DAC3     	.set    0003h		;DAC Channel 3 Register
DAC_UPDATE      .set    0004h		;DAC Update Register
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

;---------------------------------------------------------------------
; Vector address declarations
;---------------------------------------------------------------------
		.sect	".vectors"

RSVECT	B    START		; Reset Vector
INT1	  	B    PHANTOM	; Interrupt Level 1
INT2	  	B    PHANTOM	; Interrupt Level 2
INT3	  	B    PHANTOM	; Interrupt Level 3
INT4	  	B    PHANTOM	; Interrupt Level 4
INT5	  	B    PHANTOM	; Interrupt Level 5
INT6	  	B    PHANTOM	; Interrupt Level 6
RESERVED  	B    PHANTOM	; Reserved
SW_INT8   	B    PHANTOM	; User S/W Interrupt
SW_INT9   	B    PHANTOM	; User S/W Interrupt
SW_INT10  	B    PHANTOM	; User S/W Interrupt
SW_INT11  	B    PHANTOM	; User S/W Interrupt
SW_INT12  	B    PHANTOM	; User S/W Interrupt
SW_INT13  	B    PHANTOM	; User S/W Interrupt
SW_INT14  	B    PHANTOM	; User S/W Interrupt
SW_INT15  	B    PHANTOM	; User S/W Interrupt
SW_INT16  	B    PHANTOM	; User S/W Interrupt
TRAP	  	B    PHANTOM	; Trap vector
NMINT	  	B    PHANTOM	; Non-maskable Interrupt
EMU_TRAP  	B    PHANTOM	; Emulator Trap
SW_INT20  	B    PHANTOM	; User S/W Interrupt
SW_INT21  	B    PHANTOM	; User S/W Interrupt
SW_INT22  	B    PHANTOM	; User S/W Interrupt
SW_INT23  	B    PHANTOM	; User S/W Interrupt


;=====================================================================
; M A I N   C O D E  - starts here
;=====================================================================

		.text
		NOP
START:	SETC	INTM    			;Disable interrupts
		SPLK	#0000h,IMR			;Mask all core interrupts
		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			;DP for addresses 7000h-707Fh
		SPLK  #00BBh,CKCR1		;CLKIN(OSC)=10MHz,CPUCLK=20MHz
		SPLK  #00C3h,CKCR0		;CLKMD=PLL Enable,SYSCLK=CPUCLK/2
		SPLK  #40C0h,SYSCR		;CLKOUT=CPUCLK

		SPLK	#006Fh, WDCR		;Disable WD if VCCP=5V (JP5 in pos. 2-3)
		KICK_DOG				;Reset Watchdog

		SPLK  #0h,GPR0			;Set wait state generator for:
		OUT   GPR0,WSGR         	;Program Space, 0 wait states
							;Data Space, 0 wait states
							;I/O Space, 0 wait states


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