/**************************************************************************//**
 * @file     main.c
 * @version  V1.00
 * $Revision: 3 $
 * $Date: 20/07/02 5:45p $
 * @brief    Capture the PWM0 Channel 0 waveform by PWM0 Channel 2.
 *
 * SPDX-License-Identifier: Apache-2.0
 * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "NuMicro.h"


/*---------------------------------------------------------------------------------------------------------*/
/* Global variables                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/


/*--------------------------------------------------------------------------------------*/
/* Capture function to calculate the input waveform information                         */
/* u32Count[4] : Keep the internal counter value when input signal rising / falling     */
/*               happens                                                                */
/*                                                                                      */
/* time    A    B     C     D                                                           */
/*           ___   ___   ___   ___   ___   ___   ___   ___                              */
/*      ____|   |_|   |_|   |_|   |_|   |_|   |_|   |_|   |_____                        */
/* index              0 1   2 3                                                         */
/*                                                                                      */
/* The capture internal counter down count from 0x10000, and reload to 0x10000 after    */
/* input signal falling happens (Time B/C/D)                                            */
/*--------------------------------------------------------------------------------------*/
void CalPeriodTime(PWM_T *PWM, uint32_t u32Ch)
{
    uint16_t u32Count[4];
    uint32_t u32i;
    uint16_t u16RisingTime, u16FallingTime, u16HighPeriod, u16LowPeriod, u16TotalPeriod;

    /* Clear Capture Falling Indicator (Time A) */
    PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);

    /* Wait for Capture Falling Indicator  */
    while((PWM0->CAPIF & PWM_CAPIF_CFLIF2_Msk) == 0);

    /* Clear Capture Falling Indicator (Time B)*/
    PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);

    u32i = 0;

    while(u32i < 4)
    {
        /* Wait for Capture Falling Indicator */
        while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);

        /* Clear Capture Falling and Rising Indicator */
        PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH | PWM_CAPTURE_INT_RISING_LATCH);

        /* Get Capture Falling Latch Counter Data */
        u32Count[u32i++] = PWM_GET_CAPTURE_FALLING_DATA(PWM, u32Ch);

        /* Wait for Capture Rising Indicator */
        while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);

        /* Clear Capture Rising Indicator */
        PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_RISING_LATCH);

        /* Get Capture Rising Latch Counter Data */
        u32Count[u32i++] = PWM_GET_CAPTURE_RISING_DATA(PWM, u32Ch);
    }

    u16RisingTime = u32Count[1];

    u16FallingTime = u32Count[0];

    u16HighPeriod = u32Count[1] - u32Count[2];

    u16LowPeriod = 0x10000 - u32Count[1];

    u16TotalPeriod = 0x10000 - u32Count[2];

    printf("\nPWM generate: \nHigh Period=19199 ~ 19201, Low Period=44799 ~ 44801, Total Period=63999 ~ 64001\n");
    printf("\nCapture Result: Rising Time = %d, Falling Time = %d \nHigh Period = %d, Low Period = %d, Total Period = %d.\n\n",
           u16RisingTime, u16FallingTime, u16HighPeriod, u16LowPeriod, u16TotalPeriod);
    if((u16HighPeriod < 19199) || (u16HighPeriod > 19201)
            || (u16LowPeriod < 44799) || (u16LowPeriod > 44801)
            || (u16TotalPeriod < 63999) || (u16TotalPeriod > 64001))
        printf("Capture Test Fail!!\n");
    else
        printf("Capture Test Pass!!\n");
}

void SYS_Init(void)
{
    /* Unlock protected registers */
    SYS_UnlockReg();

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Enable HIRC clock */
    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);

    /* Waiting for HIRC clock ready */
    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);

    /* Switch HCLK clock source to HIRC and HCLK source divide 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));

    /* Select HIRC as the clock source of UART0 */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));

    /* Enable UART peripheral clock */
    CLK_EnableModuleClock(UART0_MODULE);

    /* Enable PWM0 module clock */
    CLK_EnableModuleClock(PWM0_MODULE);

    /* Reset PWM0 module */
    SYS_ResetModule(PWM0_RST);

    /* Update System Core Clock */
    SystemCoreClockUpdate();

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set PB multi-function pins for UART0 RXD=PB.6 and TXD=PB.4 */
    SYS->GPB_MFP1 = (SYS->GPB_MFP1 & ~(SYS_GPB_MFP1_PB4MFP_Msk | SYS_GPB_MFP1_PB6MFP_Msk)) |        \
                    (SYS_GPB_MFP1_PB4MFP_UART0_TXD | SYS_GPB_MFP1_PB6MFP_UART0_RXD);

    /* Set PB multi-function pins for PWM0 Channel 0 and 2 */
    SYS->GPB_MFP1 = (SYS->GPB_MFP1 & ~(SYS_GPB_MFP1_PB5MFP_Msk | SYS_GPB_MFP1_PB7MFP_Msk)) |
                    (SYS_GPB_MFP1_PB5MFP_PWM0_CH0 | SYS_GPB_MFP1_PB7MFP_PWM0_CH2);
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{

    /* Unlock protected registers */
//    SYS_UnlockReg();

    /* Init System, IP clock and multi-function I/O */
    SYS_Init();

    /* Lock protected registers */
    SYS_LockReg();

    /* Reset UART0 module */
    SYS_ResetModule(UART0_RST);

    /* Configure UART0 and set UART0 baud rate */
    UART_Open(UART0, 115200);

    printf("+------------------------------------------------------------------------+\n");
    printf("|                          PWM Driver Sample Code                        |\n");
    printf("|                                                                        |\n");
    printf("+------------------------------------------------------------------------+\n");
    printf("  This sample code will use PWM0 channel 2 to capture\n  the signal from PWM0 channel 0.\n");
    printf("  I/O configuration:\n");
    printf("    PWM0 channel 2(PB.7) <--> PWM0 channel 0(PB.5)\n\n");
    printf("Use PWM0 Channel 2(PB.7) to capture the PWM0 Channel 0(PB.5) Waveform\n");

    while(1)
    {
        printf("\n\nPress any key to start PWM Capture Test\n");
        getchar();

        /*--------------------------------------------------------------------------------------*/
        /* Set the PWM0 Channel 0 as PWM output function.                                       */
        /*--------------------------------------------------------------------------------------*/

        /* Assume PWM output frequency is 250Hz and duty ratio is 30%, user can calculate PWM settings by follows.
           duty ratio = (CMR+1)/(CNR+1)
           cycle time = CNR+1
           High level = CMR+1
           PWM clock source frequency from HIRC is 48,000,000
           (CNR+1) = PWM clock source frequency/prescaler/PWM output frequency
                   = 48,000,000/3/250 = 64,000
           (Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
           CNR = 64,000
           duty ratio = 30% ==> (CMR+1)/(CNR+1) = 30%
           CMR = 19,200
           Prescale value is 4 : prescaler= 5
        */

        /* set PWM0 channel 0 output configuration */
        PWM_ConfigOutputChannel(PWM0, 0, 250, 30);

        /* Enable PWM Output path for PWM0 channel 0 */
        PWM_EnableOutput(PWM0, PWM_CH_0_MASK);

        /* Enable Timer for PWM0 channel 0 */
        PWM_Start(PWM0, PWM_CH_0_MASK);

        /*--------------------------------------------------------------------------------------*/
        /* Set the PWM0 channel 2 for capture function                                          */
        /*--------------------------------------------------------------------------------------*/
        /* If input minimum frequency is 250Hz, user can calculate capture settings by follows.
           Capture clock source frequency = HIRC = 48,000,000 in the sample code.
           (CNR+1) = Capture clock source frequency/prescaler/minimum input frequency
                   = 48,000,000/3/250 = 64,000
           (Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
           CNR = 0xFFFF
           (Note: In capture mode, user should set CNR to 0xFFFF to increase capture frequency range.)

           Capture unit time = 1/Capture clock source frequency/prescaler
           62.5ns = 1/48,000,000/3
        */

        /* set PWM0 channel 2 capture configuration */
        PWM_ConfigCaptureChannel(PWM0, 2, 62, 0);

        /* Enable Timer for PWM0 channel 2 */
        PWM_Start(PWM0, PWM_CH_2_MASK);

        /* Enable Capture Function for PWM0 channel 2 */
        PWM_EnableCapture(PWM0, PWM_CH_2_MASK);

        /* Enable falling capture reload */
        PWM0->CAPCTL |= PWM_CAPCTL_FCRLDEN2_Msk;

        /* Wait until PWM0 channel 2 Timer start to count */
        while((PWM0->CNT[2]) == 0);

        /* Capture the Input Waveform Data */
        CalPeriodTime(PWM0, 2);
        /*---------------------------------------------------------------------------------------------------------*/
        /* Stop PWM0 channel 0 (Recommended procedure method 1)                                                    */
        /* Set PWM Timer loaded value(Period) as 0. When PWM internal counter(CNT) reaches to 0, disable PWM Timer */
        /*---------------------------------------------------------------------------------------------------------*/
        /* Set PWM0 channel 0 loaded value as 0 */
        PWM_Stop(PWM0, PWM_CH_0_MASK);

        /* Wait until PWM0 channel 0 Timer Stop */
        while((PWM0->CNT[0] & PWM_CNT_CNT_Msk) != 0);

        /* Disable Timer for PWM0 channel 0 */
        PWM_ForceStop(PWM0, PWM_CH_0_MASK);

        /* Disable PWM Output path for PWM0 channel 0 */
        PWM_DisableOutput(PWM0, PWM_CH_0_MASK);

        /*---------------------------------------------------------------------------------------------------------*/
        /* Stop PWM0 channel 2 (Recommended procedure method 1)                                                    */
        /* Set PWM Timer loaded value(Period) as 0. When PWM internal counter(CNT) reaches to 0, disable PWM Timer */
        /*---------------------------------------------------------------------------------------------------------*/

        /* Set loaded value as 0 for PWM0 channel 2 */
        PWM_Stop(PWM0, PWM_CH_2_MASK);

        /* Wait until PWM0 channel 2 current counter reach to 0 */
        while((PWM0->CNT[2] & PWM_CNT_CNT_Msk) != 0);

        /* Disable Timer for PWM0 channel 2 */
        PWM_ForceStop(PWM0, PWM_CH_2_MASK);

        /* Disable Capture Function and Capture Input path for  PWM0 channel 2*/
        PWM_DisableCapture(PWM0, PWM_CH_2_MASK);

        /* Clear Capture Interrupt flag for PWM0 channel 2 */
        PWM_ClearCaptureIntFlag(PWM0, 2, PWM_CAPTURE_INT_FALLING_LATCH);
    }
}
