NANO100系列的ADC参考电压选择

/**************************************************************************//**

 * [url=home.php?mod=space&uid=288409]@file[/url]     main.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V1.00

 * $Revision: 10 $

 * $Date: 15/06/16 7:22p $

 * @brief    Convert ADC channel 0, 1, 2 in Continuous Scan mode and print conversion results.

 *

 * @note

 * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.

*****************************************************************************/

#include <stdio.h>

#include "Nano100Series.h"



volatile uint8_t u8ADF;



void ADC_IRQHandler(void);



void ADC_IRQHandler(void)

{

    uint32_t u32Flag;



    // Get ADC conversion finish interrupt flag

    u32Flag = ADC_GET_INT_FLAG(ADC, ADC_ADF_INT);



    if(u32Flag & ADC_ADF_INT)

    {

        uint32_t u32Result;



        u32Result = ADC_GET_CONVERSION_DATA(ADC, 0);

        printf("Channel 0 conversion result is 0x%x\n",u32Result);

        u32Result = ADC_GET_CONVERSION_DATA(ADC, 1);

        printf("Channel 1 conversion result is 0x%x\n",u32Result);

        u32Result = ADC_GET_CONVERSION_DATA(ADC, 2);

        printf("Channel 2 conversion result is 0x%x\n",u32Result);

    }



    ADC_CLR_INT_FLAG(ADC, u32Flag);

}



/*---------------------------------------------------------------------------------------------------------*/

/* Init System Clock                                                                                       */

/*---------------------------------------------------------------------------------------------------------*/

void SYS_Init(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Set HCLK source form HXT and HCLK source divide 1  */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HXT,CLK_HCLK_CLK_DIVIDER(1));



    /* Enable external 12MHz HXT, 32KHz LXT and HIRC */

    CLK_EnableXtalRC(CLK_PWRCTL_HXT_EN_Msk | CLK_PWRCTL_LXT_EN_Msk | CLK_PWRCTL_HIRC_EN_Msk);



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_HXT_STB_Msk | CLK_CLKSTATUS_LXT_STB_Msk | CLK_CLKSTATUS_HIRC_STB_Msk);



    /*  Set HCLK frequency 42MHz */

    CLK_SetCoreClock(42000000);



    /* Enable IP clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Enable ADC clock */

    CLK_EnableModuleClock(ADC_MODULE);



    /* Select IP clock source */

    CLK_SetModuleClock(UART0_MODULE,CLK_CLKSEL1_UART_S_HXT,CLK_UART_CLK_DIVIDER(1));



    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Set PA multi-function pins for UART0 RXD and TXD */

    SYS->PB_L_MFP &= ~( SYS_PB_L_MFP_PB0_MFP_Msk | SYS_PB_L_MFP_PB1_MFP_Msk);

    SYS->PB_L_MFP |= (SYS_PB_L_MFP_PB0_MFP_UART0_RX | SYS_PB_L_MFP_PB1_MFP_UART0_TX );



    /* Set PB multi-function pins for Clock Output */

    SYS->PB_H_MFP = ( SYS->PB_H_MFP & ~SYS_PB_H_MFP_PB12_MFP_Msk ) |  SYS_PB_H_MFP_PB12_MFP_CKO;



    /* Set PA multi-function pins for ADC */

    SYS->PA_L_MFP &= ~(SYS_PA_L_MFP_PA0_MFP_Msk | SYS_PA_L_MFP_PA1_MFP_Msk | SYS_PA_L_MFP_PA2_MFP_Msk);

    SYS->PA_L_MFP |= SYS_PA_L_MFP_PA0_MFP_ADC_CH0 | SYS_PA_L_MFP_PA1_MFP_ADC_CH1 | SYS_PA_L_MFP_PA2_MFP_ADC_CH2;



    /* Disable PA.0 PA.1 PA.2 digital input path */

    PA->OFFD |= (((1<<0)|(1<<1)|(1<<2)) << GP_OFFD_OFFD_Pos);



    /* Lock protected registers */

    SYS_LockReg();

}



void UART0_Init()

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init UART                                                                                               */

    /*---------------------------------------------------------------------------------------------------------*/

    UART_Open(UART0, 115200);

}



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 */

    SYS_Init();



    /* Init UART0 for printf */

    UART0_Init();



    printf("\nThis sample code demonstrate ADC continuous scan conversion\n");

    printf("It convert channel 0,1,2 continuously and print conversion result\n");



    // Enable channel 0,1,2

    ADC_Open(ADC, ADC_INPUT_MODE_SINGLE_END, ADC_OPERATION_MODE_CONTINUOUS, (ADC_CH_0_MASK | ADC_CH_1_MASK | ADC_CH_2_MASK));



    // Set reference voltage to AVDD

    ADC_SET_REF_VOLTAGE(ADC, ADC_REFSEL_POWER);



    // Power on ADC

    ADC_POWER_ON(ADC);



    // Enable ADC ADC_IF interrupt

    ADC_EnableInt(ADC, ADC_ADF_INT);

    NVIC_EnableIRQ(ADC_IRQn);



    ADC_START_CONV(ADC);



    while(1);

}



/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/