程序跑飞的问题

ccb bcc

Mastermind 6821 points

Other Parts Discussed in Thread: TM4C123GH6PM

我用的TM4C123GH6PM，Tiva C LanunchPad。

写程序，可是一运行到下面这句，

SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1);

程序就跑飞了。

这是怎么回事呢？

我查了一下，串口1 U1Rx这个脚还有模拟功能USB0ID，U1Tx这个脚还有USB0VBUS的功能。

是不是这个复用了？谢谢！

10 年多前

0 ccb bcc 10 年多前

Mastermind 6821 points

高手支招啊！

0 xyz549040622 10 年多前

Guru 65885 points

应该是这个IO复位的时候默认为模拟功能了，你重新配置下IO功能试试。

0 ccb bcc 10 年多前回复 xyz549040622

Mastermind 6821 points

谢谢！应该怎么配置呢？我不会，还请明示。

0 xyz549040622 10 年多前回复 ccb bcc

Guru 65885 points

不对呀，不是这个语句的问题，我同样用的是Tiva C LanunchPad，开头使用了这个语句，没有跑飞的现象

//*****************************************************************************
//
// hello.c - Simple hello world example.
//
// Copyright (c) 2012-2014 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
// 
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 2.1.0.12573 of the EK-TM4C123GXL Firmware Package.
//
//*****************************************************************************

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
//#include "utils/uartstdio.h"

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Hello World (hello)</h1>
//!
//! A very simple ``hello world'' example.  It simply displays ``Hello World!''
//! on the UART and is a starting point for more complicated applications.
//!
//! UART0, connected to the Virtual Serial Port and running at
//! 115,200, 8-N-1, is used to display messages from this application.
//
//*****************************************************************************

//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endif

////*****************************************************************************
////
//// Configure the UART and its pins.  This must be called before UARTprintf().
////
////*****************************************************************************
//void
//ConfigureUART(void)
//{
//    //
//    // Enable the GPIO Peripheral used by the UART.
//    //
//    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

//    //
//    // Enable UART0
//    //
//    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

//    //
//    // Configure GPIO Pins for UART mode.
//    //
//    ROM_GPIOPinConfigure(GPIO_PA0_U0RX);
//    ROM_GPIOPinConfigure(GPIO_PA1_U0TX);
//    ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

//    //
//    // Use the internal 16MHz oscillator as the UART clock source.
//    //
//    UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);

//    //
//    // Initialize the UART for console I/O.
//    //
//    UARTStdioConfig(0, 115200, 16000000);
//}

//*****************************************************************************
//
// Print "Hello World!" to the UART on the evaluation board.
//
//*****************************************************************************
int
main(void)
{
    //volatile uint32_t ui32Loop;

    //
    // Enable lazy stacking for interrupt handlers.  This allows floating-point
    // instructions to be used within interrupt handlers, but at the expense of
    // extra stack usage.
    //
    ROM_FPULazyStackingEnable();

    //
    // Set the clocking to run directly from the crystal.
    //
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
                       SYSCTL_OSC_MAIN);

    //
    // Enable the GPIO port that is used for the on-board LED.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

    //
    // Enable the GPIO pins for the LED (PF2 & PF3).
    //
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

    //
    // Initialize the UART.
    //
//    ConfigureUART();

//    //
//    // Hello!
//    //
//    UARTprintf("Hello, world!\n");

    //
    // We are finished.  Hang around doing nothing.
    //
    while(1)
    {
        //
        // Turn on the BLUE LED.
        //
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

        //
        // Delay for a bit.
        //
        SysCtlDelay(SysCtlClockGet() / 10 / 3);

        //
        // Turn off the BLUE LED.
        //
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);

        //
        // Delay for a bit.
        //
        SysCtlDelay(SysCtlClockGet() / 10 / 3);
    }
}