TM4C1294NCPDT: TM4C1294NCPDT

//*****************************************************************************
//
// pwm.c - Example demonstrating timer-based PWM on a 16-bit CCP.
//
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// This is part of revision 2.1.4.178 of the Tiva Firmware Development Package.
//
//*****************************************************************************

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_gpio.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_timer.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"

//*****************************************************************************
//
//! \addtogroup timer_examples_list
//! <h1>PWM using Timer (pwm)</h1>
//!
//! This example shows how to configure Timer0A to generate a PWM signal on the
//! timer's CCP pin.
//
//*****************************************************************************

//*****************************************************************************
//
// Configure Timer1B as a 16-bit PWM with a duty cycle of 66%.
//
//*****************************************************************************
int
main(void)
{
	uint32_t g_ui32SysClock;

    //
    // Set the clocking to run directly from the external crystal/oscillator.
    // TODO: The SYSCTL_XTAL_ value must be changed to match the value of the
    // crystal on your board.
    //
#if defined(TARGET_IS_TM4C129_RA0) ||                                         \
    defined(TARGET_IS_TM4C129_RA1) ||                                         \
    defined(TARGET_IS_TM4C129_RA2)
    g_ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                       SYSCTL_OSC_MAIN |
                                       SYSCTL_USE_OSC), 25000000);
#else
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_16MHZ);
#endif

    //
    // The Timer1 peripheral must be enabled for use.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

    //
    // For this example T1CCP1 is used with port B pin 5.
    // The actual port and pins used may be different on your part, consult
    // the data sheet for more information.
    // GPIO port B needs to be enabled so these pins can be used.
    // TODO: change this to whichever GPIO port you are using.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOL);

    //
    // Configure the GPIO pin muxing for the Timer/CCP 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_PL4_T0CCP0);

    //
    // Configure the ccp settings for CCP pin.  This function also gives
    // control of these pins to the SSI hardware.  Consult the data sheet to
    // see which functions are allocated per pin.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinTypeTimer(GPIO_PORTL_BASE, GPIO_PIN_4);

    //
    // Configure Timer1B as a 16-bit periodic timer.
    //
    TimerConfigure(TIMER0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM);

    //
    // Set the Timer1B load value to 50000.  For this example a 66% duty cycle
    // PWM signal will be generated.  From the load value (i.e. 50000) down to
    // match value (set below) the signal will be high.  From the match value
    // to 0 the timer will be low.
    //
    TimerLoadSet(TIMER0_BASE, TIMER_A, 50000);

    //
    // Set the Timer1B match value to load value / 3.
    //
    TimerMatchSet(TIMER0_BASE, TIMER_A,
                  TimerLoadGet(TIMER0_BASE, TIMER_A) / 3);

    //
    // Enable Timer1B.
    //
    TimerEnable(TIMER0_BASE, TIMER_A);

    //
    // Loop forever while the Timer1B PWM runs.
    //
    while(1)
    {


    }
}