;******************************************************************************* ; MSP430F20x2 Demo - ADC10, Sample A1, 1.5V, TA1 Trig, Set P1.0 if > 0.5V ; ; Description: A1 is sampled 16/second (ACLK/2048) with reference to 1.5V ; Timer_A is run in upmode and TA1 is used to automatically trigger ; ADC10 conversion, TA0 defines the period Internal oscillator times sample ; (16x) and conversion (13x) Inside ADC10_ISR if A1 > 0.5Vcc, P1.0 is set, ; else reset Normal mode is LPM3 ; //* An external watch crystal on XIN XOUT is required for ACLK *// ; ; MSP430F20x2 ; ; /|\| XIN|; | | | 32kHz ; |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 #SHS_1+CONSEQ_2+INCH_1,&ADC10CTL1 ; TA1 trigger sample start mov.w #SREF_1+ADC10SHT_2+REFON+ADC10ON+ADC10IE,&ADC10CTL0; mov.w #30,&TACCR0 ; Delay to allow Ref to settle bis.w #CCIE,&TACCTL0 ; Compare-mode interrupt mov.w #TACLR+MC_1+TASSEL_2,&TACTL; up mode, SMCLK bis.w #LPM0+GIE,SR ; Enter LPM0,enable interrupts bic.w #CCIE,&TACCTL0 ; Disable timer interrupt dint ; Disable Interrupts bis.w #ENC,&ADC10CTL0 ; ADC10 enable set bis.b #002h,&ADC10AE0 ; P1.1 ADC10 option select SetupP1 bis.b #001h,&P1DIR ; P1.0 output SetupC0 mov.w #2048-1,&TACCR0 ; PWM Period SetupC1 mov.w #OUTMOD_3,&TACCTL1 ; TACCR1 set/reset mov.w #2047,&TACCR1 ; TACCR1 PWM Duty Cycle SetupTA mov.w #TASSEL_1+MC_1,&TACTL ; ACLK, up mode ; Mainloop bis.w #LPM3+GIE,SR ; Enter LPM3 nop ; Required only for debugger ; ; TA0_ISR; ISR for TACCR0 ; clr.w &TACTL ; Clear Timer_A control registers bic.w #LPM0,0(SP) ; Exit LPM0 on reti reti ; ; ADC10_ISR; ; bic.b #01h,&P1OUT ; P1.0 = cmp.w #0155h,&ADC10MEM ; ADC10MEM = A1 > 0.5V? jlo ADC10_Exit ; Again bis.b #01h,&P1OUT ; P1.0 = ADC10_Exit reti ; ; ; COMMON INTVEC ; Interrupt Vectors ; ORG ADC10_VECTOR ; ADC10 Vector DW ADC10_ISR ORG TIMERA0_VECTOR ; Timer_A0 Vector DW TA0_ISR ORG RESET_VECTOR ; POR, ext Reset DW RESET END