//******************************************************************************
// MSP-FET430P140 Demo - ADC12, Repeated Single Channel Conversions
//
// Descrip
tion: 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
}
