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Файл:Микропроцессорная техника / MSP430G2xx2_Code_Examples / msp430g2xx2_usi_05
.c/* --COPYRIGHT--,BSD_EX
* Copyright (c) 2012, Texas Instruments Incorporated
* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
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* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
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* 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--*/
//******************************************************************************
// MSP430G2xx2 Demo - USI SPI Interface to TLC549 8-bit ADC
//
// Description: This program demonstrates the USI in SPI mode interface to a
// TLC549 8-bit ADC. If AIN > 0.5(REF+ - REF-), P1.0 set, else reset.
// ACLK = n/a, MCLK = SMCLK = default DCO, UCICLK = SMCLK/4
// //** VCC must be at least 3v for TLC549 **//
//
// MSP430G2xx2
// -----------------
// /|\| XIN|-
// TLC549 | | |
// ------------- --|RST XOUT|-
// | CS|<---|P1.1 |
// | DATAOUT|--->|P1.7/SOMI P1.0|-->LED
// ~>|AIN I/O CLK|<---|P1.5/SCLK |
//
// 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
P1OUT = 0;
P1DIR |= 0x03;
USICTL0 |= USIPE7 + USIPE5 + USIMST + USIOE; // Port, SPI master
USICTL1 |= USIIE; // Counter interrupt, flag remains set
USICKCTL = USIDIV_2 + USISSEL_2; // /4 SMCLK
USICTL0 &= ~USISWRST; // USI released for operation
USICNT = 8; // init-load counter
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
// USI interrupt service routine
#pragma vector=USI_VECTOR
__interrupt void universal_serial_interface(void)
{
P1OUT |= 0x02; // Disable TLC549
if (USISRL > 0x7F)
P1OUT |= 0x01;
else
P1OUT &= ~0x01;
P1OUT &= ~0x02; // Enable TLC549
USICNT = 8; // re-load counter
}
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