diff options
Diffstat (limited to 'test/gputils/standalone/test_stand_alone.asm')
| -rw-r--r-- | test/gputils/standalone/test_stand_alone.asm | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/test/gputils/standalone/test_stand_alone.asm b/test/gputils/standalone/test_stand_alone.asm new file mode 100644 index 0000000..27e607a --- /dev/null +++ b/test/gputils/standalone/test_stand_alone.asm @@ -0,0 +1,53 @@ + list p=16f877 + #include <p16f877.inc> + + __CONFIG _CP_ALL & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _RC_OSC & _WRT_ENABLE_ON & _LVP_ON & _CPD_OFF + +;********************************************************************** +BANK0 = 0x0 +BANK1 = 0x80 +BANK2 = 0x100 +BANK3 = 0x180 + +;********************************************************************** +w_saved EQU 0x70 ; variable used for context saving +status_saved EQU 0x71 ; variable used for context saving +index EQU 0x20 + +;********************************************************************** + ORG 0x000 ; processor reset vector + movlw high start ; load upper byte of 'start' label + movwf PCLATH ; initialize PCLATH + goto start ; go to beginning of program + +;********************************************************************** + ORG 0x004 ; interrupt vector location + movwf w_saved + movfw STATUS + movwf status_saved + + bcf INTCON,2 ; reset TMR0 interrupt flag + + movfw status_saved + movwf STATUS + swapf w_saved,f + swapf w_saved,w + retfie ; return from interrupt + +;********************************************************************** +start +; initialize microchip + clrf TMR0 ^ BANK0 + clrf INTCON ^ BANK0 + banksel TRISA ; bank 1 + movlw B'11010100' ; set prescaler at 32 (32768 Hz / 4 / 256 / 32 = 1 Hz) + movwf OPTION_REG ^ BANK1 ; and start TMR0 (internal source clock) + movlw B'00000110' ; set PORTA and PORTE to be all digital + movwf ADCON1 ^ BANK1 + banksel INTCON ; back to bank 0 + bsf INTCON,T0IE ; enable TMR0 interrupt + bsf INTCON,GIE ; enable all interrupts + +; loop forever + goto $ + END ; directive 'end of program' |