/*
 * Copyright (c) 2015, Freescale Semiconductor, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o 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.
 *
 * o Neither the name of Freescale Semiconductor, Inc. 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 HOLDER 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.
 */

#include "fsl_debug_console.h"
#include "board.h"
#include "fsl_tpm.h"

#include "fsl_common.h"
#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
 * Definitions
 ******************************************************************************/
/* The Flextimer instance/channel used for board */
#define BOARD_TPM_BASEADDR TPM0
#define BOARD_FIRST_TPM_CHANNEL 4U
#define BOARD_SECOND_TPM_CHANNEL 5U

/* Get source clock for TPM driver */
#define TPM_SOURCE_CLOCK CLOCK_GetFreq(kCLOCK_McgIrc48MClk)

/*******************************************************************************
 * Prototypes
 ******************************************************************************/
/*!
 * @brief delay a while.
 */
void delay(void);

/*******************************************************************************
 * Variables
 ******************************************************************************/

/*******************************************************************************
 * Code
 ******************************************************************************/
void delay(void)
{
    volatile uint32_t i = 0U;
    for (i = 0U; i < 800000U; ++i)
    {
        __asm("NOP"); /* delay */
    }
}

/*!
 * @brief Main function
 */
int main(void)
{
    bool brightnessUp = true; /* Indicate LED is brighter or dimmer */
    tpm_config_t tpmInfo;
    uint8_t updatedDutycycle = 0U;
    tpm_chnl_pwm_signal_param_t tpmParam[2];

    /* Configure tpm params with frequency 24kHZ */
    tpmParam[0].chnlNumber = (tpm_chnl_t)BOARD_FIRST_TPM_CHANNEL;
    tpmParam[0].level = kTPM_LowTrue;
    tpmParam[0].dutyCyclePercent = 0U;

    tpmParam[1].chnlNumber = (tpm_chnl_t)BOARD_SECOND_TPM_CHANNEL;
    tpmParam[1].level = kTPM_LowTrue;
    tpmParam[1].dutyCyclePercent = 0U;

    /* Board pin, clock, debug console init */
    BOARD_InitPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();
    /* Select the clock source for the TPM counter as kCLOCK_McgIrc48MClk */
    CLOCK_SetTpmClock(1U);

    /* Print a note to terminal */
    PRINTF("\r\nTPM example to output PWM on 2 channels\r\n");
    PRINTF("\r\nYou will see a change in LED brightness if an LED is connected to the TPM pin");
    PRINTF("\r\nIf no LED is connected to the TPM pin, then probe the signal using an oscilloscope");

    /*
     * tpmInfo.prescale = kTPM_Prescale_Divide_1;
     * tpmInfo.useGlobalTimeBase = false;
     * tpmInfo.enableDoze = false;
     * tpmInfo.enableDebugMode = false;
     * tpmInfo.enableReloadOnTrigger = false;
     * tpmInfo.enableStopOnOverflow = false;
     * tpmInfo.enableStartOnTrigger = false;
     * tpmInfo.enablePauseOnTrigger = false;
     * tpmInfo.triggerSelect = kTPM_Trigger_Select_0;
     * tpmInfo.triggerSource = kTPM_TriggerSource_External;
     */
    TPM_GetDefaultConfig(&tpmInfo);
    /* Initialize TPM module */
    TPM_Init(BOARD_TPM_BASEADDR, &tpmInfo);

    TPM_SetupPwm(BOARD_TPM_BASEADDR, tpmParam, 2U, kTPM_EdgeAlignedPwm, 24000U, TPM_SOURCE_CLOCK);
    TPM_StartTimer(BOARD_TPM_BASEADDR, kTPM_SystemClock);
    while (1)
    {
        /* Delay to see the change of LED brightness */
        delay();

        if (brightnessUp)
        {
            /* Increase duty cycle until it reach limited value */
            if (++updatedDutycycle == 100U)
            {
                brightnessUp = false;
            }
        }
        else
        {
            /* Decrease duty cycle until it reach limited value */
            if (--updatedDutycycle == 0U)
            {
                brightnessUp = true;
            }
        }
        /* Start PWM mode with updated duty cycle */
        TPM_UpdatePwmDutycycle(BOARD_TPM_BASEADDR, (tpm_chnl_t)BOARD_FIRST_TPM_CHANNEL, kTPM_EdgeAlignedPwm,
                               updatedDutycycle);
        TPM_UpdatePwmDutycycle(BOARD_TPM_BASEADDR, (tpm_chnl_t)BOARD_SECOND_TPM_CHANNEL, kTPM_EdgeAlignedPwm,
                               updatedDutycycle);
    }
}
