/****************************************************************************
 * @file     main.c
 * @version  V2.0
 * $Revision: 3 $
 * $Date: 14/11/27 2:33p $
 * @brief    Demonstrate how to trigger ADC by PWM.
 * @note
 * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 *
 ******************************************************************************/
#include <stdio.h>
#include "NUC200Series.h"

#define PLLCON_SETTING  CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK       50000000


/*---------------------------------------------------------------------------------------------------------*/
/* Define Function Prototypes                                                                              */
/*---------------------------------------------------------------------------------------------------------*/
void SYS_Init(void);
void UART0_Init(void);
void ADC_PWMTrigTest_SingleOpMode(void);


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

    /* Enable Internal RC 22.1184MHz clock */
    CLK->PWRCON |= CLK_PWRCON_OSC22M_EN_Msk;

    /* Waiting for Internal RC clock ready */
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));

    /* Switch HCLK clock source to Internal RC */
    CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;

    /* Enable external XTAL 12MHz clock */
    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk;

    /* Waiting for external XTAL clock ready */
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk));

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCON = PLLCON_SETTING;
    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk));
    CLK->CLKSEL0 &= (~CLK_CLKSEL0_HCLK_S_Msk);
    CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_PLL;

    /* 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()

    /* Enable UART module clock */
    CLK->APBCLK |= CLK_APBCLK_UART0_EN_Msk;

    /* Enable ADC module clock */
    CLK->APBCLK |= CLK_APBCLK_ADC_EN_Msk ;

    /* Enable PWM01 module clock */
    CLK->APBCLK |= CLK_APBCLK_PWM01_EN_Msk ;

    /* Select UART module clock source */
    CLK->CLKSEL1 &= ~CLK_CLKSEL1_UART_S_Msk;
    CLK->CLKSEL1 |= CLK_CLKSEL1_UART_S_HXT;

    /* Select ADC module clock source */
    CLK->CLKSEL1 &= ~CLK_CLKSEL1_ADC_S_Msk ;
    CLK->CLKSEL1 |= CLK_CLKSEL1_ADC_S_HIRC ;

    /* Select PWM01 module clock source */
    CLK->CLKSEL1 &= ~CLK_CLKSEL1_PWM01_S_Msk;
    CLK->CLKSEL1 |= CLK_CLKSEL1_PWM01_S_HXT;

    /* ADC clock source is 22.1184MHz, set divider to 7, ADC clock is 22.1184/7 MHz */
    CLK->CLKDIV  = (CLK->CLKDIV & ~CLK_CLKDIV_ADC_N_Msk) | (((7) - 1) << CLK_CLKDIV_ADC_N_Pos);


    /*---------------------------------------------------------------------------------------------------------*/
    /* 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;

    /* Disable the GPA0 - GPA3 digital input path to avoid the leakage current. */
    PA->OFFD |= 0xF << GPIO_OFFD_OFFD_Pos;

    /* Configure the GPA0 - GPA3 ADC analog input pins */
    SYS->GPA_MFP &= ~(SYS_GPA_MFP_PA0_Msk | SYS_GPA_MFP_PA1_Msk | SYS_GPA_MFP_PA2_Msk | SYS_GPA_MFP_PA3_Msk) ;
    SYS->GPA_MFP |= SYS_GPA_MFP_PA0_ADC0 | SYS_GPA_MFP_PA1_ADC1 | SYS_GPA_MFP_PA2_ADC2 | SYS_GPA_MFP_PA3_ADC3 ;
    SYS->ALT_MFP1 = 0;

    /* Configure the PA12 as PWM0 output pin */
    SYS->GPA_MFP &= ~SYS_GPA_MFP_PA12_Msk;
    SYS->GPA_MFP |= SYS_GPA_MFP_PA12_PWM0;


}

/*---------------------------------------------------------------------------------------------------------*/
/* Init UART                                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
void UART0_Init()
{

    /* Reset UART IP */
    SYS->IPRSTC2 |=  SYS_IPRSTC2_UART0_RST_Msk;
    SYS->IPRSTC2 &= ~SYS_IPRSTC2_UART0_RST_Msk;

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

/*---------------------------------------------------------------------------------------------------------*/
/* Function: ADC_PWMTrigTest_SingleOpMode                                                                             */
/*                                                                                                         */
/* Parameters:                                                                                             */
/*   None.                                                                                                 */
/*                                                                                                         */
/* Returns:                                                                                                */
/*   None.                                                                                                 */
/*                                                                                                         */
/* Description:                                                                                            */
/*   ADC hardware trigger test.                                                                                 */
/*---------------------------------------------------------------------------------------------------------*/
void ADC_PWMTrigTest_SingleOpMode()
{
    printf("\n<<< PWM trigger test (Single mode) >>>\n");

    /* PWM trigger; ADC single operation mode; single-end input; enable the ADC converter. */
    ADC->ADCR = (ADC_ADCR_TRGS_PWM | ADC_ADCR_TRGEN_ENABLE | ADC_ADCR_ADMD_SINGLE | ADC_ADCR_DIFFEN_SINGLE_END | ADC_ADCR_ADEN_CONVERTER_ENABLE);
    /* Enable analog input channel 2 */
    ADC->ADCHER |= ((ADC->ADCHER & ~ADC_ADCHER_CHEN_Msk) | (1 << 2));
    /* Clear the A/D interrupt flag for safe */
    ADC->ADSR = ADC_ADSR_ADF_Msk;


    /* Center-aligned type; one-shot mode. */
    PWMA->PCR = PWM_PCR_PWM01TYPE_Msk;
    /* Clock prescaler */
    PWMA->PPR = (((2) - 1) << PWM_PPR_CP01_Pos);
    /* Timer 0 divisor=1 */
    PWMA->CSR = ((4) << PWM_CSR_CSR0_Pos);
    /* PWM counter value */ /* PWM frequency = PWM clock source/(clock prescaler setting + 1)/divisor/(CNR+1) */
    PWMA->CNR0 = 5;
    /* PWM compare value */
    PWMA->CMR0 = 1;
    /* Enable PWM0 to trigger ADC */
    PWMA->TCON = PWM_TCON_PWM0TEN_Msk;
    /* PWM0 pin output enabled. PWM frequency 1MHz, duty 30%. */
    PWMA->POE = PWM_POE_POE0_Msk;
    /* Enable the PWM timer 0 */
    PWMA->PCR |= PWM_PCR_CH0EN_Msk;

    /* Wait conversion done */
    while(!((ADC->ADSR & ADC_ADSR_ADF_Msk) >> ADC_ADSR_ADF_Pos));
    /* Clear the ADC interrupt flag */
    ADC->ADSR = ADC_ADSR_ADF_Msk;

    printf("Channel 2: 0x%X\n", ADC->ADDR[2] & 0xFFF);

    /* Disable ADC */
    ADC->ADCR = 0;
    /* Disable PWM */
    PWMA->PCR = 0;


}


/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                           */
/*---------------------------------------------------------------------------------------------------------*/
main(void)
{

    /* 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();

    /*---------------------------------------------------------------------------------------------------------*/
    /* SAMPLE CODE                                                                                             */
    /*---------------------------------------------------------------------------------------------------------*/

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

    /* ADC hardware trigger test */
    ADC_PWMTrigTest_SingleOpMode();

    /* Reset ADC module */
    SYS->IPRSTC2 |= (1 << SYS_IPRSTC2_ADC_RST_Pos) ;
    SYS->IPRSTC2 &= ~(1 << (SYS_IPRSTC2_ADC_RST_Pos)) ;

    /* Disable ADC IP clock */
    CLK->APBCLK &= ~CLK_APBCLK_ADC_EN_Msk;

    /* Disable External Interrupt */
    NVIC_DisableIRQ(ADC_IRQn);

    printf("Exit ADC sample code\n");

    while(1);

}

