Добавил:
Upload
Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз:
Предмет:
Файл:Микропроцессорная техника / MSP430G2xx3_Code_Examples / msp430g2xx3_uscia0_uart_08_9600
.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--*/
//******************************************************************************
// MSP430G2xx3 Demo - USCI_A0, UART 9600 Full-Duplex Transceiver, 32kHz ACLK
//
// Description: USCI_A0 communicates continously as fast as possible full-
// duplex with another device. Normal mode is LPM3, with activity only during
// RX and TX ISR's. The TX ISR indicates the USCI_A0 is ready to send another
// character. The RX ISR indicates the USCI_A0 has received a character. At
// 9600 baud, a full character is tranceived ~1ms.
// The levels on P1.3/P1.4 are TX'ed. RX'ed value is displayed on P1.6/0.
// ACLK = BRCLK = LFXT1 = 32768Hz, MCLK = SMCLK = DCO ~1.2MHz
// Baud rate divider with 32768Hz XTAL @9600 = 32768Hz/9600 = 3.41
//* An external watch crystal is required on XIN XOUT for ACLK *//
//
// MSP430G2xx3 MSP430G2xx3
// ----------------- -----------------
// | XIN|- /|\| XIN|-
// | | 32kHz | | | 32kHz
// | XOUT|- --|RST XOUT|-
// | | /|\ | |
// | RST|--- | |
// | | | |
// ->|P1.3 | | P1.0|-> LED
// ->|P1.4 | | P1.6|-> LED
// LED <-|P1.0 | | P1.3|<-
// LED <-|P1.6 | | P1.4|<-
// | UCA0TXD/P1.2|--------->|P1.1 |
// | | 9600 | |
// | UCA0RXD/P1.1|<---------|P1.2 |
//
//
// D. Dang
// Texas Instruments Inc.
// February 2011
// 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 = 0x00; // P1.0/6 setup for LED output
P1DIR = BIT0 + BIT6;
P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
P1SEL2 = BIT1 + BIT2;
UCA0CTL1 |= UCSSEL_1; // CLK = ACLK
UCA0BR0 = 0x03; // 32kHz/9600 = 3.41
UCA0BR1 = 0x00;
UCA0MCTL = UCBRS1 + UCBRS0; // Modulation UCBRSx = 3
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE + UCA0TXIE; // Enable USCI_A0 TX/RX interrupt
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3 w/ interrupts enabled
}
// USCI A0/B0 Transmit ISR
#pragma vector=USCIAB0TX_VECTOR
__interrupt void USCI0TX_ISR(void)
{
unsigned char TxByte=0;
if (P1IN & BIT3)
TxByte |= BIT6;
if (P1IN & BIT4)
TxByte |= BIT0;
UCA0TXBUF = TxByte; // Read, justify, and transmit
}
// USCI A0/B0 Receive ISR
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
P1OUT = UCA0RXBUF; // Display RX'ed charater
}
Соседние файлы в папке MSP430G2xx3_Code_Examples