
/****************************************************************************
 * @file     main.c
 * @version  V3.0
 * $Revision: 3 $
 * $Date: 17/05/04 1:13p $
 * @brief    Perform A/D Conversion with ADC single mode.
 * @note
 * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
 *
 ******************************************************************************/
#include <stdio.h>
#include "M071Q_M071V.h"

#define PLLCTL_SETTING  CLK_PLLCTL_72MHz_HXT
#define PLL_CLOCK       72000000


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


/*---------------------------------------------------------------------------------------------------------*/
/* Define global variables and constants                                                                   */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint32_t g_u32AdcIntFlag;



void SYS_Init(void)
{
	uint32_t u32TimeOutCnt;

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

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

    /* Waiting for HIRC clock ready */
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk))
		if(--u32TimeOutCnt == 0) break;


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

    /* Enable PLL and Set PLL frequency */
    CLK->PLLCTL = PLLCTL_SETTING;
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_PLLSTB_Msk))
		if(--u32TimeOutCnt == 0) break;

    CLK->CLKSEL0 = (CLK->CLKSEL0 & ~CLK_CLKSEL0_HCLKSEL_Msk) | CLK_CLKSEL0_HCLKSEL_PLL;

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

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

    /* Enable ADC module clock */
    CLK->APBCLK0 |= CLK_APBCLK0_ADCCKEN_Msk ;

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

    /* Select ADC module clock source */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & CLK_CLKSEL1_ADCSEL_Msk) | CLK_CLKSEL1_ADCSEL_HIRC;

    /* ADC clock source is 22.1184MHz, set divider to 7, ADC clock is 22.1184/7 MHz */
    CLK->CLKDIV0  = (CLK->CLKDIV0 & ~CLK_CLKDIV0_ADCDIV_Msk) | (((7) - 1) << CLK_CLKDIV0_ADCDIV_Pos);


    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set PD multi-function pins for UART0 RXD and TXD */
    SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD1MFP_Msk);
    SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD1MFP_UART0_TXD);
    SYS->GPD_MFPH &= ~(SYS_GPD_MFPH_PD9MFP_Msk);
    SYS->GPD_MFPH |= (SYS_GPD_MFPH_PD9MFP_UART0_RXD);

    /* Disable the GPB0 - GPB3 digital input path to avoid the leakage current. */
    GPIO_DISABLE_DIGITAL_PATH(PB, 0xF);

    /* Configure the GPB0 - GPB3 ADC analog input pins */
    SYS->GPB_MFPL &= ~(SYS_GPB_MFPL_PB0MFP_Msk | SYS_GPB_MFPL_PB1MFP_Msk | SYS_GPB_MFPL_PB2MFP_Msk | SYS_GPB_MFPL_PB3MFP_Msk);
    SYS->GPB_MFPL |= SYS_GPB_MFPL_PB0MFP_ADC0_CH0 | SYS_GPB_MFPL_PB1MFP_ADC0_CH1 | SYS_GPB_MFPL_PB2MFP_ADC0_CH2 | SYS_GPB_MFPL_PB3MFP_ADC0_CH3;

}

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

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

    printf("\n");
    printf("+----------------------------------------------------------------------+\n");
    printf("|                      ADC single mode sample code                     |\n");
    printf("+----------------------------------------------------------------------+\n");

    while(1)
    {
        printf("Select input mode:\n");
        printf("  [1] Single end input (channel 2 only)\n");
        printf("  [2] Differential input (channel pair 1 only)\n");
        printf("  Other keys: exit single mode test\n");
        u8Option = getchar();
        if(u8Option == '1')
        {
            /* Set the ADC operation mode as single, input mode as single-end and enable the ADC converter */
            ADC->ADCR = (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->ADSR0 = ADC_ADSR0_ADF_Msk;

            /* Enable the ADC interrupt */
            ADC->ADCR |= ADC_ADCR_ADIE_Msk;
            NVIC_EnableIRQ(ADC_IRQn);

            /* Reset the ADC interrupt indicator and Start A/D conversion */
            g_u32AdcIntFlag = 0;
            ADC->ADCR |= ADC_ADCR_ADST_Msk;

            /* Wait ADC interrupt (g_u32AdcIntFlag will be set at IRQ_Handler function)*/
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(g_u32AdcIntFlag == 0)
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for ADC interrupt time-out!\n");
                    return;
                }
            }

            /* Disable the ADC interrupt */
            ADC->ADCR &= ~ADC_ADCR_ADIE_Msk;

            /* Get the conversion result of the ADC channel 2 */
            i32ConversionData = (ADC->ADDR[(2)] & ADC_ADDR_RSLT_Msk) >> ADC_ADDR_RSLT_Pos;
            printf("Conversion result of channel 2: 0x%X (%d)\n\n", i32ConversionData, i32ConversionData);
        }
        else if(u8Option == '2')
        {
            /* Set the ADC operation mode as single, input mode as differential and enable the ADC converter */
            ADC->ADCR = (ADC_ADCR_ADMD_SINGLE | ADC_ADCR_DIFFEN_DIFFERENTIAL | ADC_ADCR_ADEN_CONVERTER_ENABLE);
            /* Enable analog input channel 2 for differential input channel pair 1 */
            ADC->ADCHER |= ((ADC->ADCHER & ~ADC_ADCHER_CHEN_Msk) | (1 << 2));

            /* Clear the A/D interrupt flag for safe */
            ADC->ADSR0 = ADC_ADSR0_ADF_Msk;

            /* Enable the ADC interrupt */
            ADC->ADCR |= ADC_ADCR_ADIE_Msk;
            NVIC_EnableIRQ(ADC_IRQn);

            /* Reset the ADC interrupt indicator and Start A/D conversion */
            g_u32AdcIntFlag = 0;
            ADC->ADCR |= ADC_ADCR_ADST_Msk;

            /* Wait ADC interrupt (g_u32AdcIntFlag will be set at IRQ_Handler function)*/
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(g_u32AdcIntFlag == 0)
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for ADC interrupt time-out!\n");
                    return;
                }
            }

            /* Disable the ADC interrupt */
            ADC->ADCR &= ~ADC_ADCR_ADIE_Msk;

            /* Get the conversion result of the specified ADC channel */
            i32ConversionData = (ADC->ADDR[(2)] & ADC_ADDR_RSLT_Msk) >> ADC_ADDR_RSLT_Pos;
            printf("Conversion result of channel pair 1: 0x%X (%d)\n\n", i32ConversionData, i32ConversionData);
        }
        else
            return ;

    }
}



/*---------------------------------------------------------------------------------------------------------*/
/* ADC interrupt handler                                                                                   */
/*---------------------------------------------------------------------------------------------------------*/
void ADC_IRQHandler(void)
{
    g_u32AdcIntFlag = 1;
    ADC->ADSR0 = ADC_ADSR0_ADF_Msk;      /* clear the A/D conversion flag */
}


/*---------------------------------------------------------------------------------------------------------*/
/* 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();

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

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

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

    /* Single Mode test */
    AdcSingleModeTest();

    /* Reset ADC module */
    SYS->IPRST1 |= (1 << SYS_IPRST1_ADCRST_Pos) ;
    SYS->IPRST1 &= ~(1 << (SYS_IPRST1_ADCRST_Pos)) ;

    /* Disable ADC IP clock */
    CLK->APBCLK0 &= ~CLK_APBCLK0_ADCCKEN_Msk;

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

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

    while(1);

}


/*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
