/****************************************************************************
 * @file     main.c
 * @version  V3.0
 * $Revision: 4 $
 * $Date: 14/11/27 2:33p $
 * @brief    Perform A/D Conversion with ADC continuous scan mode.
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 *
 * @copyright 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 AdcContScanModeTest(void);


void SYS_Init(void)
{
	uint32_t u32TimeOutCnt;

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

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

    /* Waiting for Internal RC clock ready */
    u32TimeOutCnt = __HIRC;
	while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* 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 */
    u32TimeOutCnt = __HIRC;
	while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* Set core clock as PLL_CLOCK from PLL */
    CLK->PLLCON = PLLCON_SETTING;
    u32TimeOutCnt = __HIRC;
	while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk))
		if(--u32TimeOutCnt == 0) break;
    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 CyclesPerUs automatically. */
    //SystemCoreClockUpdate();
    PllClock        = PLL_CLOCK;            // PLL
    SystemCoreClock = PLL_CLOCK / 1;        // HCLK
    CyclesPerUs     = PLL_CLOCK / 1000000;  // For CLK_SysTickDelay()

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

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

    /* 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;


}

/*---------------------------------------------------------------------------------------------------------*/
/* 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_GetConversionRate                                                                         */
/*                                                                                                         */
/* Parameters:                                                                                             */
/*   None.                                                                                                 */
/*                                                                                                         */
/* Returns:                                                                                                */
/*      Return the A/D conversion rate (sample/second)                                                     */
/*                                                                                                         */
/* Description:                                                                                            */
/*   The conversion rate depends on the clock source of ADC clock.                                         */
/*   It only needs 21 ADC clocks to complete an A/D conversion.                                            */
/*---------------------------------------------------------------------------------------------------------*/
static __INLINE uint32_t ADC_GetConversionRate()
{
    uint32_t u32AdcClkSrcSel;
    uint32_t u32ClkTbl[4] = {__HXT, 0, 0, __HIRC};

    /* Set the PLL clock frequency */
    u32ClkTbl[1] = PllClock;
    /* Set the system core clock frequency */
    u32ClkTbl[2] = SystemCoreClock;
    /* Get the clock source setting */
    u32AdcClkSrcSel = ((CLK->CLKSEL1 & CLK_CLKSEL1_ADC_S_Msk) >> CLK_CLKSEL1_ADC_S_Pos);
    /* Return the ADC conversion rate */
    return ((u32ClkTbl[u32AdcClkSrcSel]) / (((CLK->CLKDIV & CLK_CLKDIV_ADC_N_Msk) >> CLK_CLKDIV_ADC_N_Pos) + 1) / 21);
}

/*---------------------------------------------------------------------------------------------------------*/
/* Function: AdcContScanModeTest                                                                           */
/*                                                                                                         */
/* Parameters:                                                                                             */
/*   None.                                                                                                 */
/*                                                                                                         */
/* Returns:                                                                                                */
/*   None.                                                                                                 */
/*                                                                                                         */
/* Description:                                                                                            */
/*   ADC continuous scan mode test.                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
void AdcContScanModeTest()
{
    uint8_t  u8Option;
    uint32_t u32ChannelCount;
    int32_t  i32ConversionData;
    uint32_t u32TimeOutCnt;

    printf("\n\nConversion rate: %d samples/second\n", ADC_GetConversionRate());
    printf("\n");
    printf("+----------------------------------------------------------------------+\n");
    printf("|                 ADC continuous scan mode sample code                 |\n");
    printf("+----------------------------------------------------------------------+\n");

    printf("\nIn this test, software will get 2 cycles of conversion result from the specified channels.\n");

    while(1)
    {
        printf("\n\nSelect input mode:\n");
        printf("  [1] Single end input (channel 0, 1, 2 and 3)\n");
        printf("  [2] Differential input (input channel pair 0 and 1)\n");
        printf("  Other keys: exit continuous scan mode test\n");
        u8Option = getchar();
        if(u8Option == '1')
        {
            /* Set the ADC operation mode as continuous scan, input mode as single-end and enable the ADC converter */
            ADC->ADCR = (ADC_ADCR_ADMD_CONTINUOUS | ADC_ADCR_DIFFEN_SINGLE_END | ADC_ADCR_ADEN_CONVERTER_ENABLE);
            /* Enable analog input channel 0, 1, 2 and 3 */
            ADC->ADCHER |= ((ADC->ADCHER & ~ADC_ADCHER_CHEN_Msk) | (0xF));

            /* Clear the A/D interrupt flag for safe */
            ADC->ADSR = ADC_ADSR_ADF_Msk;

            /* Start A/D conversion */
            ADC->ADCR |= ADC_ADCR_ADST_Msk;

            /* Wait conversion done */
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(!((ADC->ADSR & ADC_ADSR_ADF_Msk) >> ADC_ADSR_ADF_Pos))
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for ADC conversion done time-out!\n");
                    return;
                }
            }

            /* Clear the ADC interrupt flag */
            ADC->ADSR = ADC_ADSR_ADF_Msk;

            for(u32ChannelCount = 0; u32ChannelCount < 4; u32ChannelCount++)
            {
                i32ConversionData = (ADC->ADDR[(u32ChannelCount)] & ADC_ADDR_RSLT_Msk) >> ADC_ADDR_RSLT_Pos;
                printf("Conversion result of channel %d: 0x%X (%d)\n", u32ChannelCount, i32ConversionData, i32ConversionData);
            }

            /* Wait conversion done */
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(!((ADC->ADSR & ADC_ADSR_ADF_Msk) >> ADC_ADSR_ADF_Pos))
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for ADC conversion done time-out!\n");
                    return;
                }
            }

            /* Stop A/D conversion */
            ADC->ADCR &= ~ADC_ADCR_ADST_Msk;

            for(u32ChannelCount = 0; u32ChannelCount < 4; u32ChannelCount++)
            {
                i32ConversionData = (ADC->ADDR[(u32ChannelCount)] & ADC_ADDR_RSLT_Msk) >> ADC_ADDR_RSLT_Pos;
                printf("Conversion result of channel %d: 0x%X (%d)\n", u32ChannelCount, i32ConversionData, i32ConversionData);
            }

            /* Clear the ADC interrupt flag */
            ADC->ADSR = ADC_ADSR_ADF_Msk;

        }
        else if(u8Option == '2')
        {
            /* Set the ADC operation mode as continuous scan, input mode as differential and enable the ADC converter */
            ADC->ADCR = (ADC_ADCR_ADMD_CONTINUOUS | ADC_ADCR_DIFFEN_DIFFERENTIAL | ADC_ADCR_ADEN_CONVERTER_ENABLE);
            /* Enable analog input channel 0 and 2 */
            ADC->ADCHER |= ((ADC->ADCHER & ~ADC_ADCHER_CHEN_Msk) | (0xF));

            /* Clear the A/D interrupt flag for safe */
            ADC->ADSR = ADC_ADSR_ADF_Msk;

            /* Start A/D conversion */
            ADC->ADCR |= ADC_ADCR_ADST_Msk;

            /* Wait conversion done */
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(!((ADC->ADSR & ADC_ADSR_ADF_Msk) >> ADC_ADSR_ADF_Pos))
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for ADC conversion done time-out!\n");
                    return;
                }
            }

            /* Clear the ADC interrupt flag */
            ADC->ADSR = ADC_ADSR_ADF_Msk;

            for(u32ChannelCount = 0; u32ChannelCount < 2; u32ChannelCount++)
            {
                i32ConversionData = (ADC->ADDR[(u32ChannelCount * 2)] & ADC_ADDR_RSLT_Msk) >> ADC_ADDR_RSLT_Pos;
                printf("Conversion result of differential input pair %d: 0x%X (%d)\n", u32ChannelCount, i32ConversionData, i32ConversionData);
            }

            /* Wait conversion done */
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(!((ADC->ADSR & ADC_ADSR_ADF_Msk) >> ADC_ADSR_ADF_Pos))
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for ADC conversion done time-out!\n");
                    return;
                }
            }

            /* Stop A/D conversion */
            ADC->ADCR &= ~ADC_ADCR_ADST_Msk;

            for(u32ChannelCount = 0; u32ChannelCount < 2; u32ChannelCount++)
            {
                i32ConversionData = (ADC->ADDR[(u32ChannelCount * 2)] & ADC_ADDR_RSLT_Msk) >> ADC_ADDR_RSLT_Pos;
                printf("Conversion result of differential input pair %d: 0x%X (%d)\n", u32ChannelCount, i32ConversionData, i32ConversionData);
            }

            /* Clear the ADC interrupt flag */
            ADC->ADSR = ADC_ADSR_ADF_Msk;

        }
        else
            return ;

    }
}




/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                           */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{

    /* Unlock protected registers */
    SYS->REGWRPROT = 0x59;
    SYS->REGWRPROT = 0x16;
    SYS->REGWRPROT = 0x88;

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

    /* Lock protected registers */
    SYS->REGWRPROT = 0x0;

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

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

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

    /* Continuous scan mode test */
    AdcContScanModeTest();

    /* 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);

}
