MSP430FR2433串口配置

Hi TI team:

    在使用FR2433的串口通讯时，出现串口1无法收发数据，改变端口配置为串口0 时，收发正常。手册中未查到串口A0和A1有差异，程序使用样的配置A1却无法正常收发。

//串口都配置9600bps,目前串口0可以与串口工具进行收发数据，但是串口1接收数据进不到中断里

//串口1发送数据，串口工具也无法接收，用示波器观察单片机端口没有数据。

请TI 帮忙看看，谢谢。

灰小子：

楼主你好。从你的描述看，是串口1配置问题的可能居多。
建议上传下相关代码，大家帮你检查一下

Susan Yang：

若是可以的话，请上传一下您的代码或者私信您的工程给我，谢谢

Maureen Hong：

回复 Susan Yang:

以上传请查收帮忙看下，谢谢。串口配置–FR2433.txt

Susan Yang：

回复 Maureen Hong:

请您使用下面的程序，UART1，测试正常

/* --COPYRIGHT--,BSD_EX* Copyright (c) 2014, 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--*/
//******************************************************************************
//MSP430FR243x Demo - eUSCI_A1 UART echo at 9600 baud using BRCLK = 16MHz
//
//Description: This demo echoes back characters received via a PC serial port.
//SMCLK/ DCO is used as a clock source and the device is put in LPM3
//The auto-clock enable feature is used by the eUSCI and SMCLK is turned off
//when the UART is idle and turned on when a receive edge is detected.
//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.
//To test code in LPM3, disconnect the debugger.
//
//ACLK = REFO = 32768Hz, MCLK = DCODIV = SMCLK = 16MHz.
//
//MSP430FR2433
//-----------------
///|\||
//| ||
//--|RST|
//||
//||
//|P2.6/UCA1TXD|----> PC (echo)
//|P2.5/UCA1RXD|<---- PC
//||
//
//Ling Zhu
//Texas Instruments Inc.
//Nov 2019
//Built with IAR Embedded Workbench v7.10 & Code Composer Studio v7.3
//******************************************************************************#include <msp430.h>void Init_GPIO();int main(void)
{WDTCTL = WDTPW | WDTHOLD;// Stop watchdog timer// Configure GPIOInit_GPIO();PM5CTL0 &= ~LOCKLPM5;// Disable the GPIO power-on default high-impedance mode// to activate 1previously configured port settings// Configure one FRAM waitstate as required by the device datasheet for MCLK// operation beyond 8MHz _before_ configuring the clock system.FRCTL0 = FRCTLPW | NWAITS_1;__bis_SR_register(SCG0);// disable FLLCSCTL3 |= SELREF__REFOCLK;// Set REFO as FLL reference sourceCSCTL0 = 0;// clear DCO and MOD registersCSCTL1 &= ~(DCORSEL_7);// Clear DCO frequency select bits firstCSCTL1 |= DCORSEL_5;// Set DCO = 16MHzCSCTL2 = FLLD_0 + 487;// DCOCLKDIV = 16MHz__delay_cycles(3);__bic_SR_register(SCG0);// enable FLLwhile(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1));// FLL lockedCSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;// set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz// default DCOCLKDIV as MCLK and SMCLK source// Configure UART pinsP2SEL0 |= BIT5 | BIT6;// set 2-UART pin as second function// Configure UARTUCA1CTLW0 |= UCSWRST;UCA1CTLW0 |= UCSSEL__SMCLK;// Baud Rate calculation// 16000000/(16*9600) = 104.167// Fractional portion = 0.167// User's Guide Table 14-4: UCBRSx = 0x11// UCBRFx = int ( (104.167-104)*16) = 2UCA1BR0 = 104;// 16000000/16/9600UCA1BR1 = 0x00;UCA1MCTLW = 0x1100 | UCOS16 | UCBRF_2;UCA1CTLW0 &= ~UCSWRST;// Initialize eUSCIUCA1IE |= UCRXIE;// Enable USCI_A0 RX interrupt__bis_SR_register(LPM3_bits|GIE);// Enter LPM3, interrupts enabled__no_operation();// For debugger
}#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A1_VECTOR
__interrupt void USCI_A1_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A1_VECTOR))) USCI_A1_ISR (void)
#else
#error Compiler not supported!
#endif
{switch(__even_in_range(UCA1IV,USCI_UART_UCTXCPTIFG)){case USCI_NONE: break;case USCI_UART_UCRXIFG:while(!(UCA1IFG&UCTXIFG));UCA1TXBUF = UCA1RXBUF;__no_operation();break;case USCI_UART_UCTXIFG: break;case USCI_UART_UCSTTIFG: break;case USCI_UART_UCTXCPTIFG: break;default: break;}
}void Init_GPIO()
{P1DIR = 0xFF; P2DIR = 0xFF; P3DIR = 0xFF;P1REN = 0xFF; P2REN = 0xFF; P3REN = 0xFF;P1OUT = 0x00; P2OUT = 0x00; P3OUT = 0x00;
}

user3756530：

回复 Susan Yang:

Hi Susan:     在没有改变任何软硬件的前提下串口1通讯又正常了，怀疑单片机内部震荡不稳定，导致和串口工具通信的时候 电压不匹配，从而不能收发数据。串口工具的电压稳定，如下是单片机的供电部分原理图，前端是4节干电池供电，经过LDO降压给MCU的。有哪些方法可以测试下么？

Maureen Hong：

回复 Susan Yang:

Susan:
想问下这句代码：PM5CTL0 &= ~LOCKLPM5;
代码中配置这行代码的话，串口都收发都正常，但是不配置，就是之前的情况，串口0可用，串口1不可用；
配置过的程序刷过后，串口1可用，这时再刷回没配置过的程序也可用了。
能否解释下这是什么现在呢，非常感谢。

灰小子：

回复 Maureen Hong:

PM5CTL0 &= ~LOCKLPM5; 这句话是对GPIO进行解锁,因为板子默认是锁定的就是说没有办法配置寄存器的相关信息,进行解锁才是有效的。

Susan Yang：

回复 Maureen Hong:

如上面文件中的定义
PM5CTL0 &= ~LOCKLPM5;// Disable the GPIO power-on default high-impedance mode// to activate 1previously configured port settings

上电默认是高阻抗模式的，这句话是激活先前配置的端口设置即 Init_GPIO();