tm4c123gxl 延时

void delay_Nms(uint n)
{
    uint i = 0;
    for(i = n;i > 0;i--)
            SysCtlDelay(SysCtlClockGet() / 3000);
}

有的例程用 SysCtlDelay(SysCtlClockGet()/3000); 来延时1ms,是因为他们使用30k的内部振荡器作为系统时钟。

你好，

我把代码附上，希望对你有帮助 : )

//*****************************************************************************
//
// project.c - Simple project to use as a starting point for more complex
// projects.
//
// Copyright (c) 2013-2014 Texas Instruments Incorporated. All rights reserved.
// Software License Agreement
//
// 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.
//
// This is part of revision 2.1.0.12573 of the Tiva Firmware Development Package.
//
//*****************************************************************************

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "driverlib/debug.h"
#include "driverlib/gpio.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Simple Project (project)</h1>
//!
//! A very simple example that can be used as a starting point for more complex
//! projects. Most notably, this project is fully TI BSD licensed, so any and
//! all of the code (including the startup code) can be used as allowed by that
//! license.
//!
//! The provided code simply toggles a GPIO using the Tiva Peripheral Driver
//! Library.
//
//*****************************************************************************

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

//*****************************************************************************
//
// Toggle a GPIO.
//
//*****************************************************************************
int
main(void)
{
//
// Enable the GPIO module.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
ROM_SysCtlDelay(1);

//
// Configure PA1 as an output.
//
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_1);

//
// Loop forever.
//
while(1)
{
//
// Set the GPIO high.
//
ROM_GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_1, GPIO_PIN_1);

//
// Delay for a while.
//
ROM_SysCtlDelay(1000000);

//
// Set the GPIO low.
//
ROM_GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_1, 0);

//
// Delay for a while.
//
ROM_SysCtlDelay(1000000);
}
}