msp430fr5739串口怎么设置

qingsong yang

Other Parts Discussed in Thread: MSP430FR5739

下面是我的串口程序，不知道哪里设置不对，调试不出来，用的是TI的pad，没有外接晶振
#include "msp430fr5739.h"
#define delayus(n) __delay_cycles(n)

void Uart_Init(void)
{
P2SEL1 |= BIT0 + BIT1;
P2SEL0 &= ~(BIT0 + BIT1); // P2.0,1 = USART0 TXD/RXD 选择端口用作接收和发送端口
UCA0CTL1 |= UCSWRST;
UCA0CTL1 = UCSSEL_2; // Set SMCLK as UCLk
UCA0BR0 = 52 ; // 9600 baud
// 8000000/(9600*16) - INT(8000000/(9600*16))=0.083
UCA0BR1 = 0;
// UCBRFx = 1, UCBRSx = 0x49, UCOS16 = 1 (Refer User Guide)
//UCA0MCTLW = 0x4911 ;
UCA0MCTLW = 0x0411 ;
UCA0CTL1 &= ~UCSWRST; // release from reset
UCA0IE |= UCRXIE; // 使能 USART0 RX 中断

}
void Uart_Put_Char(unsigned char c)
{
while (!(UCA0IFG&UCTXIFG)); //等待发送寄存器为空
UCA0TXBUF = c;
}

void Uart_Put_string(unsigned char *ptr)
{
while(*ptr != '\0')
{
Uart_Put_Char(*ptr++); // 发送数据
}

}

void main(void)
{
CSCTL0_H = 0xA5;
CSCTL1 |= DCORSEL + DCOFSEL0 + DCOFSEL1; // Set max. DCO setting
CSCTL2 = SELA_1 + SELS_3 + SELM_3; // set ACLK - VLO, the rest = MCLK = DCO
CSCTL3 = DIVA_0 + DIVS_0 + DIVM_0; // set all dividers to 0
Uart_Init();
while(1)
{
Uart_Put_string( "Sf");
delayus(5000000);
delayus(5000000);
delayus(5000000);
}
}

10 年多前

0 qingsong yang 10 年多前

Prodigy 124 points

中断那句是注释掉的

0 Triton Zhang 10 年多前回复 qingsong yang

TI__Expert 7790 points

UART的设置没有问题，你程序里面既没有关WDT，又没有清WDT的代码。可能是因为看门狗造成的。

0 yan wu2 8 年多前

Prodigy 220 points

您好，请问串口发送不需要请标志？void Uart_Put_Char(unsigned char c)
{
while (!(UCA0IFG&UCTXIFG)); //等待发送寄存器为空
UCA0TXBUF = c;

UCA0IFG&=~UCTXIFG; //这句可以不写？
}

0 Holly Gu 8 年多前回复 yan wu2

TI__Mastermind 21947 points

最好要清一下的，TXBUF空了之后就会有这个Flag，确保下一次和每一次发的时候TXBUF都真的是空的。

0 yan wu2 8 年多前回复 Holly Gu

Prodigy 220 points

我清了标志会一直循坏在while((UCA1IFG&UCTXIFG)==0);导致程序无法运行。

0 kqian0327 8 年多前

TI__Mastermind 18838 points

你好，

可以用示波器测试，TX有数据输出吗？

下面是MSP430WARE软件包里面的例程供你参考

C:\ti\msp430\MSPWare_3_20_00_37\examples\devices\MSP430FR57xx\MSP430FR57xx_Code_Examples\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--*/
//******************************************************************************
// MSP430FR57xx Demo - USCI_A0 UART echo at 9600 baud
//
// Description: This demo echoes back characters received via a PC serial portt.
// Note that level shifter hardware is needed to shift between RS232 and MSP
// voltage levels.
// The example code shows proper initialization of registers
// and interrupts to receive and transmit data.
// ACLK = n/a, MCLK = SMCLK = BRCLK = default DCO = ~1MHz
//
//
// MSP430FR5739
//
// -----------------
// RST -| P2.0/UCA0TXD|----> PC (echo)
// | |
// -| |
// | P2.1/UCA0RXD|<---- PC
// | |
//
// P. Thanigai
// Texas Instruments Inc.
// August 2010
// Built with CCS V4 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include <msp430.h>

unsigned int i;
unsigned char RXData = 0;
unsigned char TXData = 0;
unsigned char check = 0;
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // stop watchdog

// XT1 Setup

PJSEL0 |= BIT4 + BIT5;

CSCTL0_H = 0xA5;
CSCTL1 |= DCOFSEL0 + DCOFSEL1; // Set max. DCO setting
CSCTL2 = SELA_0 + SELS_3 + SELM_3; // set ACLK = XT1; MCLK = DCO
CSCTL3 = DIVA_0 + DIVS_3 + DIVM_3; // set all dividers
CSCTL4 |= XT1DRIVE_0;
CSCTL4 &= ~XT1OFF;

do
{
CSCTL5 &= ~XT1OFFG;
// Clear XT1 fault flag
SFRIFG1 &= ~OFIFG;
}while (SFRIFG1&OFIFG); // Test oscillator fault flag

// Configure UART pins
P2SEL1 |= BIT0 + BIT1;
P2SEL0 &= ~(BIT0 + BIT1);
// Configure UART 0
UCA0CTL1 |= UCSWRST;
UCA0CTL1 = UCSSEL_1; // Set ACLK = 32768 as UCBRCLK
UCA0BR0 = 3; // 9600 baud
UCA0BR1 = 0;
UCA0MCTLW |= 0x5300; // 32768/9600 - INT(32768/9600)=0.41
// UCBRSx value = 0x53 (See UG)
UCA0CTL1 &= ~UCSWRST; // release from reset
UCA0IE |= UCRXIE; // Enable RX interrupt

__bis_SR_register(LPM0_bits + GIE); // LPM3 + Enable interrupt
}

// Echo back RXed character, confirm TX buffer is ready first
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
switch(__even_in_range(UCA0IV,0x08))
{
case 0:break; // Vector 0 - no interrupt
case 2: // Vector 2 - RXIFG
while (!(UCA0IFG&UCTXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
break;
case 4:break; // Vector 4 - TXIFG
default: break;
}
}