53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
//******************************************************************************
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// MSP430G2x31 Demo - ADC10, Sample A1, AVcc Ref, Set P1.0 if > 0.75*AVcc
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//
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// Description: A single sample is made on A1 with reference to AVcc.
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// Software sets ADC10SC to start sample and conversion - ADC10SC
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// automatically cleared at EOC. ADC10 internal oscillator times sample (16x)
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// and conversion.
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//
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// MSP430G2x31
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// -----------------
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// /|\| XIN|-
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// | | |
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// --|RST XOUT|
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// | |
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// | |
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// | |
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// | |
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// input >---|P1.1/A1 P1.0|--> red Led onboard BIT0
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// | |
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// | P1.2|--> yellow Led
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// | P1.6|--> green Led onboard BIT6
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//
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//
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// D. Dang
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// Texas Instruments Inc.
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//******************************************************************************
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#include "msp430.h"
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void main(void) {
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WDTCTL = WDTPW + WDTHOLD; // Stop WDT
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ADC10CTL0 = ADC10SHT_2 + ADC10ON; // ADC10ON
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ADC10CTL1 = INCH_1; // input A1
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ADC10AE0 |= 0x02; // PA.1 ADC option select
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P1DIR |= 0x45; // Set P1.0 to output direction
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while (1) {
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ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
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while (ADC10CTL1 & ADC10BUSY); // ADC10BUSY?
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P1OUT &= ~0x45;
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if (ADC10MEM > 0x2FF) {
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P1OUT |= 0x01;
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} else if (ADC10MEM < 0x133) {
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P1OUT |= 0x40;
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} else {
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P1OUT |= 0x04;
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}
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unsigned i;
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for (i = 0xFFFF; i > 0; i--); // Delay
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}
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}
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//******************************************************************************
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