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Файл:Микропроцессорная техника / MSP430G2xx2_Code_Examples / msp430g2x32_adc10_12
.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
* are met:
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* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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--*/
//******************************************************************************
// MSP430G2x32/G2x52 Demo - ADC10, Sample A7, 1.5V, TA1 Trig, Ultra-Low Pwr
//
// Description: A7 is sampled 1024/second (32xACLK)with reference to 1.5V. All
// activity is interrupt driven with proper usage of MSP430 low-power modes,
// ADC10 and Vref demonstrated. Timer_A with both TA1/TA0 used in upmode to
// drive ADC10 conversion (continuous mode can also be used). Inside
// of TA0_ISR software will enable ADC10 and internal reference and
// allow > 30us delay for Vref to stabilize prior to sample start. Sample
// start is automatically triggered by TA1 every 32 ACLK cycles. ADC10_ISR
// will disable ADC10 and Vref and compare ADC10 conversion code. Internal
// oscillator times sample (16x) and conversion (13x). If A7 > 0.2Vcc,
// P1.0 is set, else reset. Normal Mode is LPM3.
// //* An external watch crystal on XIN XOUT is required for ACLK *//
//
// +-----(0.9766us)---------\\------------------>+
// TA0_ISR TA1 ADC10_ISR TA0_ISR TA1
// -----+------------+------------+-----------\\------+------------+----->
// Enable ADC Trigger ADC Disable ADC
// and Vref Compare
// +-( >30us--->+
//
//
// MSP430G2x32/G2x52
// -----------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// >---|P1.7/A7 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_7 + SHS_1; // P1.7, TA1 trigger sample start
ADC10AE0 = 0x80; // P1.7 ADC10 option select
P1DIR |= 0x01; // Set P1.0 to output direction
TACCTL0 = CCIE; // Enable interrupt
TACCR0 = 32-1; // PWM Period
TACCTL1 = OUTMOD_3; // TACCR1 set/reset
TACCR1 = 2; // TACCR1 PWM Duty Cycle
TACTL = TASSEL_1 + MC_1; // ACLK, up mode
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3, enable interrupts
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
ADC10CTL0 &= ~ENC; // ADC10 disabled
ADC10CTL0 = 0; // ADC10, Vref disabled completely
if (ADC10MEM < 0x88) // ADC10MEM = A7 > 0.2V?
P1OUT &= ~0x01; // Clear P1.0 LED off
else
P1OUT |= 0x01; // Set P1.0 LED on
}
// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A(void)
{
ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
ADC10CTL0 |= ENC; // ADC10 enable set
}
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