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Файл:Микропроцессорная техника / MSP430G2xx2_Code_Examples / msp430g2x12_ca_02
.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:
*
* * 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,
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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--*/
//******************************************************************************
// MSP430G2x12/G2x52 Demo - Comp_A, Detect Threshold, Set P1.0 if P1.1 > 0.25*Vcc
//
// Description: Use Comparator_A to detect a voltage threshold.
// Using an external potentiometer, an unknown voltage is applied to P1.1.
// Comparator_A compares the unknown voltage to an internal reference
// voltage, in this example 0.25*VCC. If the unknown voltage is higher
// than 0.25*VCC, P1.0 is set, if not, P1.0 is reset.
// ACLK = n/a, MCLK = SMCLK = default DCO
//
// MSP430G2x12/G2x52
// -----------------
// /|\ | XIN|-
// | | |
// ---|RST XOUT|-
// | | |
// R<-|P1.1/CA1 P1.0|-->LED
// | | |
// ---|VSS
//
// 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
P1DIR |= 0x01; // P1.0 output
CACTL1 = CARSEL + CAREF0 + CAON; // 0.25 Vcc = -comp, on
CACTL2 = P2CA4; // P1.1/CA1 = +comp
while (1) // Test comparator_A output
{
if ((CAOUT & CACTL2))
P1OUT |= 0x01; // if CAOUT set, set P1.0
else P1OUT &= ~0x01; // else reset
}
}
Соседние файлы в папке MSP430G2xx2_Code_Examples