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Cameron
2018-03-18 00:56:37 -04:00
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content/dxp_Lab9_a1.asm Normal file
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;-------------------------------------------------------------------------------
; MSP430 Assembler Code Template for use with TI Code Composer Studio
;
;
;-------------------------------------------------------------------------------
.cdecls C,LIST,"msp430g2553.h" ; Include device header file
;-------------------------------------------------------------------------------
; R/W Data
;-------------------------------------------------------------------------------
.bss ADC_SW_FLAG,1 ;
;-------------------------------------------------------------------------------
.text ; Assemble into program memory
.retain ; Override ELF conditional linking
; and retain current section
.retainrefs ; Additionally retain any sections
; that have references to current
; section
;-------------------------------------------------------------------------------
RESET mov.w #__STACK_END,SP ; Initialize stackpointer
StopWDT mov.w #WDTPW|WDTHOLD,&WDTCTL ; Stop watchdog timer
;-------------------------------------------------------------------------------
;
;-------------------------------------------------------------------------------
clr.b &ADC_SW_FLAG ; Clear ADC SW flag
clr.w r5 ; Register used to store and process the sample value
; after its acquisition
;-------------------------------------------------------------------------------
; Select analog function on P1.0, i.e. pin2 of the 20PDIP package
;-------------------------------------------------------------------------------
; bis.b #0x01, &ADC10AE0 ; P1.0 on pin 2 analog function enabled
;-------------------------------------------------------------------------------
; Main loop from here
;-------------------------------------------------------------------------------
Mainloop call #ACQUIRE ;
jmp Mainloop ;
;-------------------------------------------------------------------------------
ACQUIRE:
clr.w &ADC10CTL0 ; Clear configuration registers just in case
clr.w &ADC10CTL1 ; some values were left on by a prior routine
;-------------------------------------------------------------------------------
; ADC10CTL0 configuration based on the CLR instruction above and the one below:
; SREF=001, ADC10SHT=64*ADC10CLKs, ADC10SR=0, REFOUT=0, REFBURST=0, MSC=0,
; REF2_5=0, REFON=1, ADC10ON=1, ADC10IE=1, ADC10IFG=0, ENC=0, ADC10SC=0
;-------------------------------------------------------------------------------
bis.w #(SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE), &ADC10CTL0 ;
;-------------------------------------------------------------------------------
; ADC10CTL1 configuration based on the CLR instruction above and the ones below:
; INCH=1010, SHS=00, ADC10DF=0, ISSH=0, ADC10DIV=/8, ADC10SSEL=00,
; CONSEQ=00, ADC10BUSY=0
;-------------------------------------------------------------------------------
bis.w #(INCH_10 + ADC10DIV_7), &ADC10CTL1 ; Input channel = int. temp. diode
eint ; Enable general interrupts
clrz ; Clear Z
clr.b &ADC_SW_FLAG ; Clear ADC SW FLAG
bis.w #(ENC + ADC10SC), &ADC10CTL0 ; Start a conversion
CheckFlag tst.b &ADC_SW_FLAG ; Check to see if ADC10_ISR was
jz CheckFlag ; executed
dint ; Disable general interrupts
clr.w &ADC10CTL0 ; Clear configuration registers
clr.w &ADC10CTL1 ; Safe practice
ret ;
;-------------------------------------------------------------------------------
; Interrupt Service Routines
;-------------------------------------------------------------------------------
ADC10_ISR:
nop ;
bic.w #ADC10IFG, &ADC10CTL0 ;
mov.w &ADC10MEM, r5 ;
;-------------------------------------------------------------------------------
; Set the ADC SW flag, which is continuously checked by the ACQUIRE routine
;-------------------------------------------------------------------------------
mov.b #0x01, &ADC_SW_FLAG ;
reti ;
;-------------------------------------------------------------------------------
; Stack Pointer definition
;-------------------------------------------------------------------------------
.global __STACK_END
.sect .stack
;-------------------------------------------------------------------------------
; Interrupt Vectors
;-------------------------------------------------------------------------------
.sect ".reset" ; MSP430 RESET Vector
.short RESET
;-------------------------------------------------------------------------------
.sect ".int05" ; ADC10 Vector
isr_adc10: .short ADC10_ISR ;
.end