[参考译文] TM4C1294NCPDT：高速时的二进制计数器

谢谢Charles。 下面是实施您的解决方案的代码：

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_ints.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/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"


//*****************************************************************************
// SELECT BITS
//*****************************************************************************
uint32_t g_ui32SelectBits;

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

//*****************************************************************************
// The interrupt handler for the first timer interrupt.
//*****************************************************************************
void Timer0IntHandler(void) {
    // Clear the timer interrupt.
    ROM_TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);

    // Output the value of SELECT bits to PE0-4 pins
    GPIOPinWrite(GPIO_PORTE_BASE, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4, g_ui32SelectBits);

    // Update select bits
    g_ui32SelectBits++;
}

//*****************************************************************************
// 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);
}

int main(void) {

    // Initialize SelectBits
    g_ui32SelectBits = 0;

    // 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 PLL
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

    // Initialize the UART and write status.
    ConfigureUART();
    UARTprintf("Hello, world!\n");

    // Enable the GPIO port that is used for the on-board LED.
    MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);

    // Enable the GPIO pins for SELECT pins
    MAP_GPIOPinTypeGPIOOutput(GPIO_PORTE_BASE, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4);

    // Enable the peripherals used by this example.
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

    // Enable processor interrupts.
    ROM_IntMasterEnable();

    // Configure the two 32-bit periodic timers.
    ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
    ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, (ROM_SysCtlClockGet() / 1000000) - 1);

    // Setup the interrupts for the timer timeouts.
    ROM_IntEnable(INT_TIMER0A);
    ROM_TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);

    // Enable the timers and start infinite loop
    ROM_TimerEnable(TIMER0_BASE, TIMER_A);
    while(1) {}
}