?? msp430x20x3_usi_05.c
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//******************************************************************************
// MSP430F20x2/3 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 **//
//
// MSP430F20x2/3
// -----------------
// /|\| XIN|-
// TLC549 | | |
// ------------- --|RST XOUT|-
// | CS|<---|P1.1 |
// | DATAOUT|--->|P1.7/SOMI P1.0|-->LED
// ~>|AIN I/O CLK|<---|P1.5/SCLK |
//
// P.Thanigai
// Texas Instruments Inc.
// May 2007
// Built with Code Composer Essentials Version: 2.0
//******************************************************************************
#include <msp430x20x3.h>
void 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
__interrupt void USI_VECTOR(void);
USI_ISR(USI_VECTOR)
__interrupt void USI_VECTOR(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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