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Файл:Микропроцессорная техника / MSP430G2xx3_Code_Examples / msp430g2x33_adc10_13
.c/* --COPYRIGHT--,BSD_EX
* Copyright (c) 2012, Texas Instruments Incorporated
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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* * Redistributions of source code must retain the above copyright
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*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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*******************************************************************************
*
* MSP430 CODE EXAMPLE DISCLAIMER
*
* MSP430 code examples are self-contained low-level programs that typically
* demonstrate a single peripheral function or device feature in a highly
* concise manner. For this the code may rely on the device's power-on default
* register values and settings such as the clock configuration and care must
* be taken when combining code from several examples to avoid potential side
* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
* for an API functional library-approach to peripheral configuration.
*
* --/COPYRIGHT--*/
//******************************************************************************
// MSP430G2x33/G2x53 Demo - ADC10, DTC Sample A1 32x, AVcc, TA0 Trig, DCO
//
// Description; A1 is sampled in 32x burst using DTC 16 times per second
// (ACLK/2048) with reference to AVcc. Activity is interrupt driven.
// Timer_A in upmode uses TA0 toggle to drive ADC10 conversion. Sample burst
// is automatically triggered by TA0 rising edge every 2048 ACLK cycles.
// ADC10_ISR will exit from LPM3 mode and return CPU active. Internal ADC10OSC
// times sample (16x) and conversion (13x). DTC transfers conversion code to
// RAM 200h - 240h. In the Mainloop P1.0 is toggled. Normal Mode is LPM3.
// //* An external watch crystal on XIN XOUT is required for ACLK *//
//
// MSP430G2x33/G2x53
// -----------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// >---|P1.1/A1 P1.0 |--> LED
//
// D. Dang
// Texas Instruments Inc.
// December 2010
// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include <msp430.h>
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
ADC10CTL1 = INCH_1 + SHS_2 + CONSEQ_2; // TA0 trigger
ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE;
ADC10DTC1 = 0x20; // 32 conversions
P1DIR |= 0x01; // Set P1.0 output
ADC10AE0 |= 0x02; // P1.1 ADC10 option select
TACCR0 = 1024-1; // PWM Period
TACCTL0 = OUTMOD_4; // TACCR0 toggle
TACTL = TASSEL_1 + MC_1; // ACLK, up mode
for (;;)
{
ADC10CTL0 &= ~ENC;
while (ADC10CTL1 & BUSY); // Wait if ADC10 core is active
ADC10SA = 0x200; // Data buffer start
ADC10CTL0 |= ENC; // Sampling and conversion ready
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3, enable interrupts
P1OUT ^= 0x01; // Toggle P1.0 using exclusive-OR
}
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
__bic_SR_register_on_exit(LPM3_bits); // Clear LPM3 bits from 0(SR)
}
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