;******************************************************************************* ; MSP430F20x2 Demo - ADC10, Sample A1, AVcc Ref, Set P1.0 if A1 > 0.5*AVcc ; ; Description: A single sample is made on A1 with reference to AVcc ; Software sets ADC10SC to start sample and conversion - ADC10SC ; automatically cleared at EOC ADC10 internal oscillator times sample (16x) ; and conversion In Mainloop MSP430 waits in LPM0 to save power until ADC10 ; conversion complete, ADC10_ISR will force exit from any LPMx in Mainloop on ; reti If A1 > 0.5*AVcc, P1.0 set, else reset ; ; MSP430F20x2 ; ; /|\| XIN|; | | | ; |RST XOUT|; | | ; > -|P1.1/A1 P1.0| > LED ; ; L Westlund ; Texas Instruments Inc ; May 2006 ; Built with IAR Embedded Workbench Version: 3.41A ;******************************************************************************* #include "msp430x20x2.h" ; RSEG CSTACK ; Define stack segment ; RSEG CODE ; Assemble to Flash memory ; RESET mov.w #SFE(CSTACK),SP ; Initialize stackpointer StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT SetupADC10 mov.w #ADC10SHT_2+ADC10ON+ADC10IE,&ADC10CTL0 ; 16x, enable int mov.w #INCH_1, &ADC10CTL1 bis.b #02h,&ADC10AE0 ; P1.1 ADC10 option select SetupP1 bis.b #001h,&P1DIR ; P1.0 output ; Mainloop bis.w #ENC+ADC10SC,&ADC10CTL0 ; Start sampling/conversion bis.w #CPUOFF+GIE,SR ; LPM0, ADC10_ISR will force exit bic.b #01h,&P1OUT ; P1.0 = cmp.w #01FFh,&ADC10MEM ; ADC10MEM = A1 > 0.5AVcc? jlo Mainloop ; Again bis.b #01h,&P1OUT ; P1.0 = jmp Mainloop ; Again ; ; ADC10_ISR; Exit LPM0 on reti ; bic.w #CPUOFF,0(SP) ; Exit LPM0 on reti reti ; ; ; COMMON INTVEC ; Interrupt Vectors ; ORG ADC10_VECTOR ; ADC10 Vector DW ADC10_ISR ORG RESET_VECTOR ; POR, ext Reset DW RESET END