/**************************************************************************//**
 * @file     main.c
 * @version  V1.00
 * $Revision: 3 $
 * $Date: 16/07/22 10:58a $
 * @brief    NUC230_240 Series PWM Generator and Capture Timer Driver Sample Code
 *
 * @note
 * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 *
 ******************************************************************************/
#include <stdio.h>
#include "NUC230_240.h"

/*---------------------------------------------------------------------------------------------------------*/
/* Macro, type and constant definitions                                                                    */
/*---------------------------------------------------------------------------------------------------------*/

#define PLL_CLOCK           72000000


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

/**
 * @brief       PWMB IRQ Handler
 *
 * @param       None
 *
 * @return      None
 *
 * @details     ISR to handle PWMB interrupt event
 */
void PWMB_IRQHandler(void)
{
//    uint32_t u32PwmIntFlag;
    uint32_t u32CapIntFlag1;

    /* Handle PWMB Capture function */
    u32CapIntFlag1 = PWMB->CCR2;

    /* PWMB channel 2 Capture interrupt */
    if(u32CapIntFlag1 & PWM_CCR2_CAPIF2_Msk) {
        PWMB->CCR2 &= (PWM_CCR_MASK | PWM_CCR2_CAPIF2_Msk);
    }
}

/*--------------------------------------------------------------------------------------*/
/* 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, u16HighPeroid, u16LowPeroid, u16TotalPeroid;

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

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

    /* 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];

    u16HighPeroid = u32Count[1] - u32Count[2];

    u16LowPeroid = 0x10000 - u32Count[1];

    u16TotalPeroid = 0x10000 - u32Count[2];

    printf("\nPWM generate: \nHigh Period=7199 ~ 7201, Low Period=16799 ~ 16801, Total Period=23999 ~ 24001\n");
    printf("\nCapture Result: Rising Time = %d, Falling Time = %d \nHigh Period = %d, Low Period = %d, Total Period = %d.\n\n",
           u16RisingTime, u16FallingTime, u16HighPeroid, u16LowPeroid, u16TotalPeroid);
    if((u16HighPeroid < 7199) || (u16HighPeroid > 7201) || (u16LowPeroid < 16799) || (u16LowPeroid > 16801) || (u16TotalPeroid < 23999) || (u16TotalPeroid > 24001))
        printf("Capture Test Fail!!\n");
    else
        printf("Capture Test Pass!!\n");
}

void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable Internal RC clock */
    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);

    /* Waiting for IRC22M clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);

    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));

    /* Enable external 12MHz XTAL, internal 22.1184MHz */
    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk);

    /* Enable PLL and Set PLL frequency */
    CLK_SetCoreClock(PLL_CLOCK);

    /* Waiting for clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_OSC22M_STB_Msk);

    /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(2));

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

    /* Enable PWM module clock */
    CLK_EnableModuleClock(PWM45_MODULE);
    CLK_EnableModuleClock(PWM67_MODULE);

    /* Select UART module clock source */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));

    /* Select PWM module clock source */
    CLK_SetModuleClock(PWM45_MODULE, CLK_CLKSEL2_PWM45_S_HXT | CLK_CLKSEL2_PWM45_EXT_HXT, 0);
    CLK_SetModuleClock(PWM67_MODULE, CLK_CLKSEL2_PWM67_S_HXT | CLK_CLKSEL2_PWM67_EXT_HXT, 0);

    /* User can select PWM module clock source from LIRC as below */
    //CLK_SetModuleClock(PWM45_MODULE, CLK_CLKSEL2_PWM45_S_LIRC | CLK_CLKSEL2_PWM45_EXT_LIRC, 0);
    //CLK_SetModuleClock(PWM67_MODULE, CLK_CLKSEL2_PWM67_S_LIRC | CLK_CLKSEL2_PWM67_EXT_LIRC, 0);

    /* Reset PWMB channel0~channel3 */
    SYS_ResetModule(PWM47_RST);

    /* Update System Core Clock */
    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
    //SystemCoreClockUpdate();
    PllClock        = PLL_CLOCK;            // PLL
    SystemCoreClock = PLL_CLOCK / 1;        // HCLK
    CyclesPerUs     = PLL_CLOCK / 1000000;  // For SYS_SysTickDelay()

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set GPB multi-function pins for UART0 RXD and TXD */
    SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
    SYS->GPB_MFP |= (SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD);

    /* Set GPE multi-function pins for PWMB Channel1 and channel2 */
    SYS->GPE_MFP &= ~(SYS_GPE_MFP_PE5_Msk | SYS_GPE_MFP_PE0_Msk);
    SYS->GPE_MFP |= SYS_GPE_MFP_PE5_PWM5 | SYS_GPE_MFP_PE0_PWM6;
    SYS->ALT_MFP &= ~(SYS_ALT_MFP_PE5_Msk);
    SYS->ALT_MFP |= SYS_ALT_MFP_PE5_PWM5;
    SYS->ALT_MFP2 &= ~(SYS_ALT_MFP2_PE5_Msk);
    SYS->ALT_MFP2 |= SYS_ALT_MFP2_PE5_PWM5;
}

void UART0_Init()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset IP */
    SYS_ResetModule(UART0_RST);

    /* Configure UART0 and set UART0 Baudrate */
    UART_Open(UART0, 115200);
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    /* Init System, IP clock and multi-function I/O
       In the end of SYS_Init() will issue SYS_LockReg()
       to lock protected register. If user want to write
       protected register, please issue SYS_UnlockReg()
       to unlock protected register if necessary */

    /* Unlock protected registers */
    SYS_UnlockReg();

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

    /* Lock protected registers */
    SYS_LockReg();

    /* Init UART0 for printf */
    UART0_Init();

    printf("\nSystem clock rate: %d Hz\n", SystemCoreClock);

    printf("+------------------------------------------------------------------------+\n");
    printf("|                          PWM Driver Sample Code                        |\n");
    printf("|                                                                        |\n");
    printf("+------------------------------------------------------------------------+\n");
    printf("  This sample code will use PWMB channel 2 to capture\n  the signal from PWMB channel 1.\n");
    printf("  I/O configuration:\n");
    printf("    PWM5(PE.5 PWMB channel 1) <--> PWM6(PE.0 PWMB channel 2)\n\n");
    printf("Use PWMB Channel 2(PE.0) to capture the PWMB Channel 1(PE.5) Waveform\n");

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

        /*--------------------------------------------------------------------------------------*/
        /* Set the PWMB Channel 1 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 = __HXT = 12000000
           (CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
                   = 12000000/2/1/250 = 24000
           (Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
           CNR = 23999
           duty ratio = 30% ==> (CMR+1)/(CNR+1) = 30%
           CMR = 7199
           Prescale value is 1 : prescaler= 2
           Clock divider is PWM_CSR_DIV1 : clock divider =1
        */

        /* set PWMB channel 1 output configuration */
        PWM_ConfigOutputChannel(PWMB, PWM_CH1, 250, 30);

        /* Enable PWM Output path for PWMB channel 1 */
        PWM_EnableOutput(PWMB, 0x2);

        /* Enable Timer for PWMB channel 1 */
        PWM_Start(PWMB, 0x2);

        /*--------------------------------------------------------------------------------------*/
        /* Set the PWMB channel 2  for capture function                                         */
        /*--------------------------------------------------------------------------------------*/

        /* If input minimum frequency is 250Hz, user can calculate capture settings by follows.
           Capture clock source frequency = __HXT = 12000000 in the sample code.
           (CNR+1) = Capture clock source frequency/prescaler/clock source divider/minimum input frequency
                   = 12000000/2/1/250 = 24000
           (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.)
        */

        /* set PWMB channel 2 capture configuration */
        PWM_ConfigCaptureChannel(PWMB, PWM_CH2, 166, 0);

        /* Enable Backward Compatible: write 1 to clear CFLRI0~3 and CRLRI0~3 */
        PWMB->PBCR = 1;

        /* Enable capture falling edge interrupt for PWMB channel 2 */
        PWM_EnableCaptureInt(PWMB, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);

        /* Enable PWMB NVIC interrupt */
        NVIC_EnableIRQ((IRQn_Type)(PWMB_IRQn));

        /* Enable Timer for PWMB channel 2  */
        PWM_Start(PWMB, 0x4);

        /* Enable Capture Function for PWMB channel 2 */
        PWM_EnableCapture(PWMB, 0x4);

        /* Wait until PWMB channel 2 Timer start to count */
        while(PWMB->PDR2 == 0);

        /* Capture the Input Waveform Data */
        CalPeriodTime(PWMB, PWM_CH2);
        /*------------------------------------------------------------------------------------------------------*/
        /* Stop PWMB channel 1 (Recommended procedure method 1)                                                 */
        /* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */
        /*------------------------------------------------------------------------------------------------------*/

        /* Set PWMB channel 1 loaded value as 0 */
        PWM_Stop(PWMB, 0x2);

        /* Wait until PWMB channel 1 Timer Stop */
        while(PWMB->PDR1 != 0);

        /* Disable Timer for PWMB channel 1 */
        PWM_ForceStop(PWMB, 0x2);

        /* Disable PWM Output path for PWMB channel 1 */
        PWM_DisableOutput(PWMB, 0x2);

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

        /* Disable PWMB NVIC */
        NVIC_DisableIRQ((IRQn_Type)(PWMB_IRQn));

        /* Set loaded value as 0 for PWMB channel 2 */
        PWM_Stop(PWMB, 0x4);

        /* Wait until PWMB channel 2 current counter reach to 0 */
        while(PWMB->PDR2 != 0);

        /* Disable Timer for PWMB channel 2 */
        PWM_ForceStop(PWMB, 0x4);

        /* Disable Capture Function and Capture Input path for  PWMB channel 2*/
        PWM_DisableCapture(PWMB, 0x4);

        /* Clear Capture Interrupt flag for PWMB channel 2*/
        PWM_ClearCaptureIntFlag(PWMB, PWM_CH2, PWM_CAPTURE_INT_FALLING_LATCH);
    }
}




