/**************************************************************************//**
 * @file     main.c
 * @version  V3.00
 * $Revision: 2 $
 * $Date: 16/10/25 4:27p $
 * @brief
 *           Change duty cycle of output waveform by configured period.
 *
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 *
 * @copyright Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "NUC126.h"

/*---------------------------------------------------------------------------------------------------------*/
/* Macro, type and constant definitions                                                                    */
/*---------------------------------------------------------------------------------------------------------*/
#define PLLCTL_SETTING  CLK_PLLCTL_144MHz_HXT

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


uint32_t CalNewDutyCMR(PWM_T *pwm, uint32_t u32ChannelNum, uint32_t u32DutyCycle, uint32_t u32CycleResolution);

/**
 * @brief       PWM0 IRQ Handler
 *
 * @param       None
 *
 * @return      None
 *
 * @details     ISR to handle PWM0 interrupt event
 */
void PWM0_IRQHandler(void)
{

}

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

    /* Enable HIRC clock (Internal RC 22.1184MHz) */
    CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk;

    /* Waiting for HIRC clock ready */
    while(!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk));

    /* Select HCLK clock source as HIRC and HCLK clock divider as 1 */
    CLK->CLKSEL0 = (CLK->CLKSEL0 & ~CLK_CLKSEL0_HCLKSEL_Msk) | CLK_CLKSEL0_HCLKSEL_HIRC;
    CLK->CLKDIV0 = (CLK->CLKDIV0 & ~CLK_CLKDIV0_HCLKDIV_Msk) | CLK_CLKDIV0_HCLK(1);

    /* Enable HXT clock (external XTAL 12MHz) */
    CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk;

    /* Waiting for HXT clock ready */
    while(!(CLK->STATUS & CLK_STATUS_HXTSTB_Msk));

    /* Enable PLL and Set PLL frequency */
    CLK->PLLCTL = PLLCTL_SETTING;
    while(!(CLK->STATUS & CLK_STATUS_PLLSTB_Msk));
    CLK->CLKSEL0 = (CLK->CLKSEL0 & ~CLK_CLKSEL0_HCLKSEL_Msk) | CLK_CLKSEL0_HCLKSEL_PLL;

    /* Enable PWM0 module clock */
    CLK->APBCLK0 |= CLK_APBCLK0_PWM0CKEN_Msk;

    /*---------------------------------------------------------------------------------------------------------*/
    /* PWM clock frequency configuration                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Select HCLK clock divider as 2 */
    CLK->CLKDIV0 = (CLK->CLKDIV0 & ~CLK_CLKDIV0_HCLKDIV_Msk) | CLK_CLKDIV0_HCLK(2);

    /* PWM clock frequency can be set equal or double to HCLK by choosing case 1 or case 2 */
    /* case 1.PWM clock frequency is set equal to HCLK: select PWM module clock source as PCLK */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_PWM0SEL_Msk) | CLK_CLKSEL1_PWM0SEL_PCLK0;

    /* case 2.PWM clock frequency is set double to HCLK: select PWM module clock source as PLL */
    //CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_PWM0SEL_Msk) | CLK_CLKSEL1_PWM0SEL_PLL;
    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable UART module clock */
    CLK->APBCLK0 |= CLK_APBCLK0_UART0CKEN_Msk;

    /* Select UART module clock source as HXT */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_UARTSEL_Msk) | CLK_CLKSEL1_UARTSEL_HXT;

    /* Reset PWM0 module */
    SYS->IPRST1 |= SYS_IPRST1_PWM0RST_Msk;
    SYS->IPRST1 &= ~SYS_IPRST1_PWM0RST_Msk;

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

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set PD multi-function pins for UART0 RXD, TXD */
    SYS->GPD_MFPL = (SYS->GPD_MFPL & ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk)) | \
                    (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);

    /* Set PC multi-function pins for PWM0 Channel0~3 */
    SYS->GPC_MFPL = (SYS->GPC_MFPL & ~(SYS_GPC_MFPL_PC0MFP_Msk | SYS_GPC_MFPL_PC1MFP_Msk | SYS_GPC_MFPL_PC2MFP_Msk | SYS_GPC_MFPL_PC3MFP_Msk)) | \
                    (SYS_GPC_MFPL_PC0MFP_PWM0_CH0 | SYS_GPC_MFPL_PC1MFP_PWM0_CH1 | SYS_GPC_MFPL_PC2MFP_PWM0_CH2 | SYS_GPC_MFPL_PC3MFP_PWM0_CH3);
}

void UART0_Init()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART IP */
    SYS->IPRST1 |=  SYS_IPRST1_UART0RST_Msk;
    SYS->IPRST1 &= ~SYS_IPRST1_UART0RST_Msk;

    /* Configure UART0 and set UART0 baud rate */
    UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HXT, 115200);
    UART0->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}

/**
 * @brief       Calculate the comparator value of new duty by configured period
 *
 * @param       pwm                  The pointer of the specified PWM module
 *
 * @param       u32ChannelNum        PWM channel number. Valid values are between 0~5
 *
 * @param       u32DutyCycle         Target generator duty cycle percentage. Valid range are between 0 ~ u32CycleResolution.
 *                                   If u32CycleResolution is 100, and u32DutyCycle is 10 means 10%, 20 means 20% ...
 *
 * @param       u32CycleResolution   Target generator duty cycle resolution. The value in general is 100.
 *
 * @return      The compatator value by new duty cycle
 */
uint32_t CalNewDutyCMR(PWM_T *pwm, uint32_t u32ChannelNum, uint32_t u32DutyCycle, uint32_t u32CycleResolution)
{
    return (u32DutyCycle * (PWM_GET_CNR(pwm, u32ChannelNum) + 1) / u32CycleResolution);
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    uint8_t  u8Option;
    uint32_t u32NewDutyCycle = 0, u32NewCMR = 0;

    /* 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 UART to 115200-8n1 for print message */
    UART0_Init();

    printf("\n\nCPU @ %dHz(PLL@ %dHz)\n", SystemCoreClock, PllClock);
    printf("PWM0 clock is from %s\n", (CLK->CLKSEL1 & CLK_CLKSEL1_PWM0SEL_Msk) ? "CPU" : "PLL");
    printf("+-----------------------------------------------------------------------------------+\n");
    printf("|                          PWM Driver Sample Code                                   |\n");
    printf("|                                                                                   |\n");
    printf("+-----------------------------------------------------------------------------------+\n");
    printf("  This sample code will use PWM0 channel 0 to output waveform, and switch duty cycle.\n");
    printf("  I/O configuration:\n");
    printf("    waveform output pin: PWM0 channel 0(PC.0)\n");
    printf("\nOutput waveform is 1800000Hz and it's duty is 50%%.\n");

    /*
      Configure PWM0 channel 0 init period and duty(up counter type).
      Period is PLL / (prescaler * (CNR + 1))
      Duty ratio = (CMR) / (CNR + 1)
      Period = 72 MHz / (1 * (39 + 1)) = 1800000 Hz
      Duty ratio = (100) / (39 + 1) = 50%
    */
    /* Set PWM to up counter type(edge aligned) */
    PWM0->CTL1 &= ~PWM_CTL1_CNTTYPE0_Msk;

    /* Set PWM Timer clock prescaler */
    PWM_SET_PRESCALER(PWM0, 0, 0); /* Divided by 1 */

    /* Set PWM Timer duty */
    PWM_SET_CMR(PWM0, 0, 20);

    /* Set PWM Timer period */
    PWM_SET_CNR(PWM0, 0, 39);

    /* Set waveform generation */
    //PWM0->WGCTL0 = 0x2;
    //PWM0->WGCTL1 = 0x1;
    PWM_SET_OUTPUT_LEVEL(PWM0, PWM_CH_0_MASK, PWM_OUTPUT_HIGH, PWM_OUTPUT_LOW, PWM_OUTPUT_NOTHING, PWM_OUTPUT_NOTHING);

    /* Enable output of PWM0 channel 0 */
    PWM0->POEN |= PWM_POEN_POEN0_Msk;

    /* Start */
    PWM0->CNTEN |= PWM_CNTEN_CNTEN0_Msk;

    while(1)
    {
        printf("\nSelect new duty: \n");
        printf("[1] 100%% \n");
        printf("[2] 75%% \n");
        printf("[3] 25%% \n");
        printf("[4] 0%% \n");
        printf("[Other] Exit \n");
        u8Option = getchar();

        if(u8Option == '1')
        {
            u32NewDutyCycle = 100;
        }
        else if(u8Option == '2')
        {
            u32NewDutyCycle = 75;
        }
        else if(u8Option == '3')
        {
            u32NewDutyCycle = 25;
        }
        else if(u8Option == '4')
        {
            u32NewDutyCycle = 0;
        }
        else
        {
            printf("Exit\n");
            break;
        }
        /* Get new comparator value by call CalNewDutyCMR() */
        u32NewCMR = CalNewDutyCMR(PWM0, 0, u32NewDutyCycle, 100);
        /* Set new comparator value to register */
        PWM_SET_CMR(PWM0, 0, u32NewCMR);
    }

    /* Stop PWM counter */
    PWM0->CNTEN &= ~PWM_CNTEN_CNTEN0_Msk;
    /* Disable output of PWM0 channel 0 */
    PWM0->POEN &= ~PWM_POEN_POEN0_Msk;

    while(1);
}
