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//******************************************************************************
// MSP-FET430P140 Demo - ADC12, Repeated Single Channel Conversions // // Description: This example shows how to perform repeated conversions on a // single channel using "repeat-single-channel" mode. AVcc is used for the // reference and repeated conversions are performed on Channel A0. Each // conversion result is moved to an 8-element array called results[]. Test by // applying a voltage to channel A0, then running. To view the conversion results // open a watch window and view 'results.' // This can run even in LPM4 mode as ADC has its own clock // // MSP430F149 // --------------- // | | // Vin -->|P6.0/A0 | // | | // // // M. Mitchell // Texas Instruments Inc. // Feb 2005 // Built with IAR Embedded Workbench Version: 3.21A //****************************************************************************** #include #define Num_of_Results 8 static unsigned int results[Num_of_Results]; // Needs to be global in this // example. Otherwise, the // compiler removes it because it // is not used for anything. void main(void) { WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer P6SEL |= 0x01; // Enable A/D channel A0 ADC12CTL0 = ADC12ON+SHT0_8+MSC; // Turn on ADC12, set sampling time ADC12CTL1 = SHP+CONSEQ_2; // Use sampling timer, set mode ADC12IE = 0x01; // Enable ADC12IFG.0 ADC12CTL0 |= ENC; // Enable conversions ADC12CTL0 |= ADC12SC; // Start conversion _BIS_SR(LPM0_bits + GIE); // Enter LPM0,Enable interrupts } #pragma vector=ADC_VECTOR __interrupt void ADC12ISR (void) { static unsigned int index = 0; results[index] = ADC12MEM0; // Move results index = (index+1)%Num_of_Results; // Increment results index, modulo } |
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