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Файл:Микропроцессорная техника / MSP430G2xx2_Code_Examples / msp430g2xx2_usi_01
.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;
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* 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--*/
//******************************************************************************
// MSP430G2xx2 Demo - USICNT Used as a One-Shot Timer Function, DCO SMCLK
//
// Description: USI conunter is used as a one-shot timer. The USI
// conunter ISR toggles P1.0 using software. As coded ACLK is pre-divided by
// 128 and the USICNT loaded with 32, for a total divided of 4096 or
// 12-bits. USICNT must be reloaded after each interrupt which also clears
// interrupt flag.
// ACLK = VLO, MCLK = SMCLK = default DCO
//
// MSP430G2xx2
// -----------------
// /|\| XIN|-
// | | |
// --|RST XOUT|-
// | |
// | 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 watchdog timer
BCSCTL3 |= LFXT1S_2; // ACLK = VLO
P1DIR |= 0x01; // Set P1.0 to output direction
USICTL0 |= USIMST; // Master mode
USICTL1 |= USIIE; // Counter interrupt, flag remains set
USICKCTL = USIDIV_7 + USISSEL_1; // /128 ACLK
USICTL0 &= ~USISWRST; // USI released for operation
_BIS_SR(LPM3_bits + GIE); // Enter LPM3 w/ interrupt
}
// USI interrupt service routine
#pragma vector=USI_VECTOR
__interrupt void universal_serial_interface(void)
{
P1OUT ^= 0x01; // Toggle P1.0 using exclusive-OR
USICNT = 0x1F; // re-load counter
}
Соседние файлы в папке MSP430G2xx2_Code_Examples