[参考译文] TM4C1230H6PM：UART通信问题：数据不正确

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Other Parts Discussed in Thread: TM4C1230H6PM, EK-TM4C123GXL

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1098371/tm4c1230h6pm-uart-communication-issue-data-incorrect

零件号：TM4C1230H6PM
主题中讨论的其他部件： TM4C123， EK-TM4C123GXL

您好，

我正在使用TM4C1230H6PM定制板。我正在将实时数据(使用PC)传输到自定义板(使用FTDI USB到TTL)。控制器上从实时传输的数据和接收的数据不匹配。我得到了以下数据。

TX (实时) Rx (自定义板)

1. 0x02 0x0C

2. 0x05 0x13

3. 0x07 0x1f

TX (自定义板) Rx (实术语)

1. 0x0C E2

2. 0x13 E5

3. 0x1f E7

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"

//*****************************************************************************
//
//! \addtogroup uart_examples_list
//! <h1>UART Polled I/O (uart_polled)</h1>
//!
//! This example shows how to set up the UART and use polled I/O methods
//! for transmitting and receiving UART data.  The example receives characters
//! from UART0 and retransmits the same character using UART0.  It can be
//! tested by using a serial terminal program on a host computer.  This
//! example will echo every character that is type until the return/enter key
//! is pressed.
//!
//! This example uses the following peripherals and I/O signals.  You must
//! review these and change as needed for your own board:
//! - UART1 peripheral
//! - GPIO Port C peripheral (for UART1 pins)
//! - UART1RX - PC4
//! - UART1TX - PC5
//
//*****************************************************************************

//*****************************************************************************
//
// Configure the UART and perform reads and writes using polled I/O.
//
//*****************************************************************************
int
main(void)
{
    char cThisChar;
    // Enable the peripherals used by this example.
    // The UART itself needs to be enabled, as well as the GPIO port
    // containing the pins that will be used.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

    //
    // Configure the GPIO pin muxing for the UART function.
    // This is only necessary if your part supports GPIO pin function muxing.
    // Study the data sheet to see which functions are allocated per pin.
    // TODO: change this to select the port/pin you are using
    //
    GPIOPinConfigure(GPIO_PC4_U1RX);
    GPIOPinConfigure(GPIO_PC5_U1TX);

    //
    // Since GPIO C4 and C5 are used for the UART function, they must be
    // configured for use as a peripheral function (instead of GPIO).
    // TODO: change this to match the port/pin you are using
    //
    GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_4 | GPIO_PIN_5);

    //
    // Configure the UART for 115,200, 8-N-1 operation.
    // This function uses SysCtlClockGet() or ui32SysClock to get the system clock
    // frequency.  This could be also be a variable or hard coded value
    // instead of a function call.
    //
    //
    // Put a character to show start of example.  This will display on the
    // terminal.
    //
    UARTCharPut(UART1_BASE, 'S');

    //
    // Enter a loop to read characters from the UART, and write them back
    // (echo).  When a line end is received, the loop terminates.
    //
    do
    {
        //
        // Read a character using the blocking read function.  This function
        // will not return until a character is available.
        //
        cThisChar = UARTCharGet(UART1_BASE);

        //
        // Write the same character using the blocking write function.  This
        // function will not return until there was space in the FIFO and
        // the character is written.
        //
        UARTCharPut(UART1_BASE, cThisChar);
    }
    while((cThisChar != '\n') && (cThisChar != '\r'));

    //
    // Put a character to show the end of the example.  This will display on
    // the terminal.
    //
    UARTCharPut(UART1_BASE, 'S');

    //
    // Return no errors
    //
    return(0);
}

当我在TM4C123 Lunachpad上运行相同的代码并使用FTI USB至TTL适配器时，我不会得到这种不一致性。