uart - MSP430FR5994 UART 与 Python 中的 PC 通信

问题描述

我尝试学习如何使用 UART，对于初学者来说，我只想将一些东西从微控制器发送到 PC。我用这个代码文件定位自己。

微控制器：MSP430FR5994 LaunchPad 开发套件

UART：FTDI 电缆到引脚 2.6(UCA1RXD) 和 2.5(UCA1TXD)

微控制器在 virtualbox Windows 机器上使用 CCS 进行编程。python 脚本在主要的 linux 系统上使用 python3 运行。

到目前为止我做了什么：

用于接收的 Python 脚本

import serial                                     # import pySerial module
ComPort = serial.Serial('/dev/ttyUSB0',timeout=1) # open ttyUSB0

ComPort.baudrate = 9600                           # set Baud rate
ComPort.bytesize = 8                    # Number of data bits = 8
ComPort.parity   = 'N'                  # No parity
ComPort.stopbits = 1                    # Number of Stop bits = 1

data = ComPort.read()               # Wait and read data from serial port
print(data)                             # print the received data

ComPort.close()                         # Close the COM Port

微控制器的 C 脚本

#include <msp430.h> 
void UART_init(void);

void main(void) {
  WDTCTL = WDTPW | WDTHOLD;   //Stop watchdog timer
  PM5CTL0 &= ~LOCKLPM5;

  UART_init();

  UCA1TXBUF = 'A';

}

void UART_init(void){
    P2SEL1 |= BIT5 + BIT6;              //Activate Pin for UART use
    P2SEL0 &= ~BIT5 + ~BIT6;            //Activate Pin for UART use

    UCA1CTLW0 |= UCSSEL_2;              //Select clock SMCLK

    UCA1BRW = 0x6;                      //Set Baud rate 9600 : UCA1BRW = INT(F_CPU/BAUD_soll) =         INT(1MHz/9600) = 104 with oversampling: 6
    UCA1MCTLW |= UCBRS5 + UCOS16 + UCBRF3;     //Modulation according to datasheet table: UCBRS = 0x20 = b100000 and UCOS16 = 1 and UCBRF = 8 = 0x8 = b1000

    UCA1CTLW0 &= ~UCSWRST;  //Reset UART module
 }

然后我刷新微控制器代码，然后运行 python 代码。但我什么也得不到。1秒超时后，我得到b''。

错误可能在哪里？没有交流吗？针脚错了吗？因为我只是在学习它，所以我真的不知道为什么它不起作用。也许你有一些建议:)

问候，

到目前为止 ，我尝试了以下方法，但仍然无法正常工作：

进入低功耗模式

#include <msp430.h> 
void UART_init(void);

void main(void) {
  WDTCTL = WDTPW | WDTHOLD;   //Stop watchdog timer
  PM5CTL0 &= ~LOCKLPM5;

  UART_init();

  UCA1TXBUF = 'A';
  __bis_SR_register(LPM0_bits);

}

void UART_init(void){
    P2SEL1 |= BIT5 + BIT6;              //Activate Pin for UART use
    P2SEL0 &= ~BIT5 + ~BIT6;            //Activate Pin for UART use

    UCA1CTLW0 |= UCSSEL_2;              //Select clock SMCLK

    UCA1BRW = 0x6;                      //Set Baud rate 9600 : UCA1BRW = INT(F_CPU/BAUD_soll) =         INT(1MHz/9600) = 104 with oversampling: 6
    UCA1MCTLW |= UCBRS5 + UCOS16 + UCBRF3;     //Modulation according to datasheet table: UCBRS = 0x20 = b100000 and UCOS16 = 1 and UCBRF = 8 = 0x8 = b1000

    UCA1CTLW0 &= ~UCSWRST;  //Reset UART module
}

在进入和不进入低功耗模式的情况下，永远不要退出 while(1) 循环

#include <msp430.h> 
void UART_init(void);

void main(void) {
  WDTCTL = WDTPW | WDTHOLD;   //Stop watchdog timer
  PM5CTL0 &= ~LOCKLPM5;

  UART_init();

  while(1){
  UCA1TXBUF = 'A';
  __bis_SR_register(LPM0_bits); // with and without the entering LPM0 mode
  }
}

void UART_init(void){
    P2SEL1 |= BIT5 + BIT6;              //Activate Pin for UART use
    P2SEL0 &= ~BIT5 + ~BIT6;            //Activate Pin for UART use

    UCA1CTLW0 |= UCSSEL_2;              //Select clock SMCLK

    UCA1BRW = 0x6;                      //Set Baud rate 9600 : UCA1BRW = INT(F_CPU/BAUD_soll) =         INT(1MHz/9600) = 104 with oversampling: 6
    UCA1MCTLW |= UCBRS5 + UCOS16 + UCBRF3;     //Modulation according to datasheet table: UCBRS = 0x20 = b100000 and UCOS16 = 1 and UCBRF = 8 = 0x8 = b1000

    UCA1CTLW0 &= ~UCSWRST;  //Reset UART module
 }

我也尝试插入

 while(!(UCA1IFG & UCTXIFG));

在这两种情况下。最后，我也尝试了中断：

#include <msp430.h> 
void UART_init(void);

void main(void) {
  WDTCTL = WDTPW | WDTHOLD;   //Stop watchdog timer
  PM5CTL0 &= ~LOCKLPM5;

  UART_init();

  __bis_SR_register(LPM0_bits + GIE);

}

void UART_init(void){
    P2SEL1 |= BIT5 + BIT6;              //Activate Pin for UART use
    P2SEL0 &= ~BIT5 + ~BIT6;            //Activate Pin for UART use

    UCA1CTLW0 |= UCSSEL_2;              //Select clock SMCLK

    UCA1BRW = 0x6;                      //Set Baud rate 9600 : UCA1BRW = INT(F_CPU/BAUD_soll) =         INT(1MHz/9600) = 104 with oversampling: 6
    UCA1MCTLW |= UCBRS5 + UCOS16 + UCBRF3;     //Modulation according to datasheet table: UCBRS = 0x20 = b100000 and UCOS16 = 1 and UCBRF = 8 = 0x8 = b1000

    UCA1CTLW0 &= ~UCSWRST;  //Reset UART module
    UCA1IE |= UCTXIE;       //enable transmitting interrupts
}

#pragma vector= EUSCI_A1_VECTOR
__interrupt void USCI_A1_ISR(void){
   while(!(UCA1IFG & UCTXIFG)); //with and without this line
   UCA1TXBUF = 'A';
}

标签： uartmsp430

uart - MSP430FR5994 UART 与 Python 中的 PC 通信

问题描述

解决方案

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