/******************************************************************************
 * @file     ecap.c
 * @brief    ECAP firmware functions.
 * @version  V1.8.0
 * @date     31-Dec-2021
 *
 * @note
 * Copyright (C) 2021 Spintrol Limited. All rights reserved.
 *
 * @attention
 * THIS SOFTWARE JUST PROVIDES CUSTOMERS WITH CODING INFORMATION REGARDING
 * THEIR PRODUCTS, WHICH AIMS AT SAVING TIME FOR THEM. SPINTROL SHALL NOT BE
 * LIABLE FOR THE USE OF THE SOFTWARE. SPINTROL DOES NOT GUARANTEE THE
 * CORRECTNESS OF THIS SOFTWARE AND RESERVES THE RIGHT TO MODIFY THE SOFTWARE
 * WITHOUT NOTIFICATION.
 *
 ******************************************************************************/

#include "ecap.h"




/******************************************************************************
 * @brief      Initializes the ECAP module operating in capture mode
 *
 * @param[in]  ECAPx  :  Select the ECAP module
 * @param[in]  ePinNum:  Select the GPIO pin as capture input
 *
 * @return     none
 *
 ******************************************************************************/
void ECAP_CaptureModeInit(ECAP_REGS *ECAPx, GPIO_PinEnum ePinNum)
{
    /* Configure IO Pin for capture */
    ECAP_SetInput(ECAPx, ePinNum, GPIO_LEVEL_HIGH);

    /* Open ECAP clock */
    CLOCK_EnableModule(ECAP_MODULE);

    ECAPx->CAPCTL.all =   CAPCTL_ALL_APWMMODE_CAPTURE_MODE        /* Configure ECAP as Capture mode             */
                          | CAPCTL_ALL_CAPLDEN_ENABLE               /* Enable Cap Register loading on a capture event */
                          | CAPCTL_ALL_STOPWRAP_ON_CAPTURE_EVENT3   /* Stop/Wrap after Capture Event 3            */
                          | CAPCTL_ALL_ONESHOT_DISABLE              /* Operate in Continuous mode                 */
                          | CAPCTL_ALL_CAP0POL_TRIG_ON_RISING_EDGE  /* Event 0 occurs on pulse rising edge        */
                          | CAPCTL_ALL_CAP1POL_TRIG_ON_FALLING_EDGE /* Event 1 occurs on pulse falling edge       */
                          | CAPCTL_ALL_CAP2POL_TRIG_ON_RISING_EDGE  /* Event 2 occurs on pulse rising edge        */
                          | CAPCTL_ALL_CAP3POL_TRIG_ON_FALLING_EDGE /* Event 3 occurs on pulse falling edge       */
                          | CAPCTL_ALL_CNTRST0_ENABLE               /* Reset capture counter when Event 0 occurs  */
                          | CAPCTL_ALL_CNTRST1_ENABLE               /* Reset capture counter when Event 1 occurs  */
                          | CAPCTL_ALL_CNTRST2_ENABLE               /* Reset capture counter when Event 2 occurs  */
                          | CAPCTL_ALL_CNTRST3_ENABLE               /* Reset capture counter when Event 3 occurs  */
                          | CAPCTL_ALL_TSCNTRUN_STOP_COUNTER;       /* Disable ECAP counter                       */

    /* Disable Capture event interrupt */
    ECAPx->CAPIE.all = 0x0;
}




/******************************************************************************
 * @brief      Initializes the ECAP module operating in APWM mode
 *
 * @param[in]  ECAPx     :  Select the ECAP module
 * @param[in]  ePinNum   :  Select GPIO pin for output PWM
 * @param[in]  u32PwmFreq:  Define the frequency of PWM
 *                          This function will calculate period automaticlly
 *
 * @return     none
 *
 ******************************************************************************/
void ECAP_APWMModeInit(ECAP_REGS *ECAPx, GPIO_PinEnum ePinNum, uint32_t u32PwmFreq)
{
    /* Configure ECAP APWM output pin */
    GPIO_SetPinChannel(ePinNum, PINMUX_CHANNEL_7);

    /* Config ECAP operating mode */
    ECAPx->CAPCTL.bit.APWMMODE = CAPCTL_BIT_APWMMODE_APWM_MODE;

    /* Calculate Period Value based on system clock, ECAP clock and PWM frequency*/
    ECAPx->CAP0.all = CLOCK_GetModuleClock(ECAP_MODULE) / u32PwmFreq;
}




/******************************************************************************
 * @brief      Set the duty of PWM waveform
 *
 * @param[in]  u32PwmDuty:  Define the duty of PWM
 *                          PWM duty = u32PwmDuty/10000  (00.00% ~ 100.00%)
 *
 * @return     none
 *
 ******************************************************************************/
void ECAP_APWMSetDuty(ECAP_REGS *ECAPx, uint32_t u32PwmDuty)
{
    if (u32PwmDuty == 10000)
    {
        ECAPx->CAP1.all = ECAPx->CAP0.all;
    }
    else if (ECAPx->CAP0.all >= (0xFFFFFFFFUL / u32PwmDuty))
    {
        ECAPx->CAP1.all = (ECAPx->CAP0.all / 10000) * u32PwmDuty;
    }
    else
    {
        ECAPx->CAP1.all = (ECAPx->CAP0.all * u32PwmDuty) / 10000;
    }
}




/******************************************************************************
 * @brief      Set capture synchronization source input
 *
 * @param[in]  ECAPx    :  Select the ECAP module
 * @param[in]  ePinNum  :  Select the GPIO pin
 *                         See GPIO_PinEnum for details
 * @param[in]  ePinLevel:  Select the GPIO pin level to generate Sync event
 *                         Please goto GPIO_LevelEnum for selection
 *
 * @return     none
 *
 ******************************************************************************/
void ECAP_SetSyncFromGPIO(ECAP_REGS *ECAPx, GPIO_PinEnum ePinNum, uint8_t ePinLevel)
{
    /* Set Pin as GPIO input */
    GPIO_SetPinAsGPIO(ePinNum);
    GPIO_SetPinDir(ePinNum, GPIO_INPUT);

    ECAPx->CAPSYNCICTL.all = ePinNum | (ePinLevel << CAPSYNCICTL_ALL_POL_Pos);
}


/******************* (C) COPYRIGHT 2021 SPINTROL LIMITED ***** END OF FILE ****/
