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Файл:Микропроцессорная техника / MSP430G2xx3_Code_Examples / msp430g2x13_ca_03
.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,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*******************************************************************************
*
* 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--*/
//******************************************************************************
// MSP430G2x13/G2x53 Demo - Comp_A, Simple 2.2V Low Battery Detect
//
// Description: Two comparator_A reference generators 0.25*Vcc and ~0.55V
// are compared for a simple battery check of 2.2V. In the subroutine
// Batt_Check, a small capacitor between P2.3 and Vss is first charged
// to 0.25*Vcc and then compared to ~0.55V. If 0.25*Vcc,
// is above ~0.55V, P1.0 is toggled, else set. Batt_Check is called
// constantly in an endless loop - in an actual application, Batt_Check
// should be called infrequently to save power.
// ACLK = n/a, MCLK = SMCLK = default DCO
//
// There is a tolerance of the Comp_A reference generator and in the
// device specific datasheet. In most applications, the tolerence of the
// reference generator is more than adequate to detect Low Battery.
//
// MSP430G2x13/G2x53
// -----------------
// /|\ | XIN|-
// | | |
// ---|RST XOUT|-
// | |
// +-----|P1.1/CA1 P1.0|-->LED
// | | |
// ===.1uf| |
// | | |
// +-----|Vss
//
void Batt_Check(void);
unsigned int i;
//
// 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
CACTL2 = P2CA4; // P1.1 = CA1
while (1) // Mainloop
{
Batt_Check();
}
}
void Batt_Check(void) {
CACTL1 = CAREF_1 + CAON; // 0.25*Vcc on P1.1, Comp. on
i = 16384; // delay
while(i>0) {
i--;
}
CACTL1 = CARSEL + CAREF_2 + CAREF_1 + CAON; // 0.55V on -, Comp. on
if (CACTL2 & CAOUT)
P1OUT ^= 0x01; // P1.0 toggle
else P1OUT |= 0x01; // P1.0 set
CACTL1 = 0x00; // Disable Comp_A, save power
}
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