[DemoCode下载] M091的带隙基准读取

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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Convert Band-gap (channel 29) and print conversion result.

 *

 * SPDX-License-Identifier: Apache-2.0

 * [url=home.php?mod=space&uid=17282]@CopyRight[/url] (C) 2020 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "NuMicro.h"





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

/* Define global variables and constants                                                                   */

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

volatile uint32_t g_u32AdcIntFlag;





void SYS_Init(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable HIRC */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Switch HCLK clock source to HIRC/1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Set both PCLK0 and PCLK1 as HCLK/1 */

    CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV1);



    /* Switch UART0 clock source to HIRC */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));



    /* Enable UART peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Enable ADC module clock */

    CLK_EnableModuleClock(ADC_MODULE);



    /* ADC clock source is PCLK1, set divider to 2 */

    CLK_SetModuleClock(ADC_MODULE, CLK_CLKSEL2_ADCSEL_PCLK1, CLK_CLKDIV0_ADC(2));



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                              */

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

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

    SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) |

                    (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);



    /* Lock protected registers */

    SYS_LockReg();

}



void ADC_FunctionTest()

{

    int32_t  i32ConversionData;



    printf("\n");

    printf("+----------------------------------------------------------------------+\n");

    printf("|                  ADC for Band-gap test                               |\n");

    printf("+----------------------------------------------------------------------+\n");



    printf("+----------------------------------------------------------------------+\n");

    printf("|   ADC clock source -> PCLK1  = 48 MHz                                |\n");

    printf("|   ADC clock divider          = 2                                     |\n");

    printf("|   ADC clock                  = 48 MHz / 2 = 24 MHz                   |\n");

    printf("|   ADC extended sampling time = 71                                    |\n");

    printf("|   ADC conversion time = 17 + ADC extended sampling time = 88         |\n");

    printf("|   ADC conversion rate = 24 MHz / 88 = 272.7 ksps                     |\n");

    printf("+----------------------------------------------------------------------+\n");



    /* Enable ADC converter */

    ADC_POWER_ON(ADC);



    /* Set input mode as single-end, Single mode, and select channel 29 (band-gap voltage) */

    ADC_Open(ADC, ADC_ADCR_DIFFEN_SINGLE_END, ADC_ADCR_ADMD_SINGLE, BIT29);



    /* To sample band-gap precisely, the ADC capacitor must be charged at least 3 us for charging the ADC capacitor ( Cin )*/

    /* Sampling time = extended sampling time + 1 */

    /* 1/24000000 * (Sampling time) = 3 us */

    /* Set sample module external sampling time to 71 */

    ADC_SetExtendSampleTime(ADC, 0, 71);



    /* Clear the A/D interrupt flag for safe */

    ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);



    /* Enable the sample module interrupt.  */

    ADC_ENABLE_INT(ADC, ADC_ADF_INT);   /* Enable sample module A/D interrupt. */

    NVIC_EnableIRQ(ADC_IRQn);



    /* Reset the ADC interrupt indicator and trigger sample module to start A/D conversion */

    g_u32AdcIntFlag = 0;

    ADC_START_CONV(ADC);



    /* Wait ADC conversion done */

    while(g_u32AdcIntFlag == 0);



    /* Disable the A/D interrupt */

    ADC_DISABLE_INT(ADC, ADC_ADF_INT);



    /* Get the conversion result of the channel 29 */

    i32ConversionData = ADC_GET_CONVERSION_DATA(ADC, 29);

    printf("ADC Conversion result of Band-gap: 0x%X (%d)\n", i32ConversionData, i32ConversionData);

    printf("Band-gap voltage is %dmV if Reference voltage is 3.3V\n", (3300*i32ConversionData)/4095);

}



void ADC_IRQHandler(void)

{

    g_u32AdcIntFlag = 1;

    ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT); /* Clear the A/D interrupt flag */

}



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

/* Init UART0                                                           */

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

void UART0_Init(void)

{

    /* Reset UART0 */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 baud rate */

    UART_Open(UART0, 115200);

}



int32_t main(void)

{

    /* Init System, IP clock and multi-function I/O. */

    SYS_Init();



    /* Init UART0 for printf */

    UART0_Init();



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



    /* ADC function test */

    ADC_FunctionTest();



    /* Disable ADC IP clock */

    CLK_DisableModuleClock(ADC_MODULE);



    /* Disable External Interrupt */

    NVIC_DisableIRQ(ADC_IRQn);



    printf("Exit ADC sample code\n");



    while(1);

}