[牛人杂谈] 八月新唐+NAN0103SD3AE PWM模拟DA输出音频

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

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

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

 * $Revision: 3 $

 * $Date: 16

 02/19 9:36a $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Demonstrate PWM0 channel 0 trigger ADC.

 *

 * @note

 * Copyright (C) 2015 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "Nano103.h"



void ADC_IRQHandler(void);  //ADC interrupt service routine



void ADC_IRQHandler(void)  //ADC interrupt service routine

{

    uint32_t u32Flag;  //ADC interrupt status flag



    // Get ADC conversion finish interrupt flag

    u32Flag = ADC_GET_INT_FLAG(ADC, ADC_ADF_INT);



    // Check ADC conversion finish interrupt flag

    if(u32Flag & ADC_ADF_INT)

        {

//                 printf("Channel 0 conversion result is 0x%x\r\n", (unsigned int)ADC_GET_CONVERSION_DATA(ADC, 0));

                PWM_ConfigOutputChannel(PWM0, 1, 8000, 100*(unsigned int)ADC_GET_CONVERSION_DATA(ADC, 0)/0xfff);

        }

        

    // Clear ADC conversion finish interrupt flag

    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_HCLKSEL_HXT,CLK_HCLK_CLK_DIVIDER(1));



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

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk | CLK_PWRCTL_LXTEN_Msk | CLK_PWRCTL_HIRC0EN_Msk | CLK_PWRCTL_HIRC1EN_Msk | CLK_PWRCTL_MIRCEN_Msk);



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk | CLK_STATUS_LXTSTB_Msk | CLK_STATUS_HIRC0STB_Msk | CLK_STATUS_HIRC1STB_Msk | CLK_STATUS_MIRCSTB_Msk);



    /*  Set HCLK frequency 32MHz */

    CLK_SetCoreClock(32000000);



    /* Enable IP clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(ADC_MODULE);

    CLK_EnableModuleClock(PWM0_MODULE);



    /* Select IP clock source */

    CLK_SetModuleClock(UART0_MODULE,CLK_CLKSEL1_UART0SEL_HXT,CLK_UART0_CLK_DIVIDER(1));

    CLK_SetModuleClock(ADC_MODULE,CLK_CLKSEL1_ADCSEL_HIRC,CLK_ADC_CLK_DIVIDER(5));

    CLK_SetModuleClock(PWM0_MODULE, CLK_CLKSEL1_PWM0SEL_PCLK0, 0);



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

    /* Init I/O Multi-function                                                                                 */

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

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

    SYS->GPB_MFPL &= ~( SYS_GPB_MFPL_PB0MFP_Msk | SYS_GPB_MFPL_PB1MFP_Msk);

    SYS->GPB_MFPL |= (SYS_GPB_MFPL_PB0MFP_UART0_RXD | SYS_GPB_MFPL_PB1MFP_UART0_TXD );



    /* Set PA.0 multi-function pin for ADC channel 0 */

    SYS->GPA_MFPL = (SYS->GPA_MFPL & ~SYS_GPA_MFPL_PA0MFP_Msk) | SYS_GPA_MFPL_PA0MFP_ADC_CH0;



    /* Disable PA.0 digital input path */

    PA->DINOFF |= ((1 << 0) << GPIO_DINOFF_DINOFF0_Pos);



        SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA12MFP_Msk)) | SYS_GPA_MFPH_PA12MFP_PWM0_CH0;

    SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA14MFP_Msk)) | SYS_GPA_MFPH_PA13MFP_PWM0_CH1;



    /* Lock protected registers */

    SYS_LockReg();

}



void UART0_Init(void)

{

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

    /* Init UART                                                                                               */

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

    SYS_ResetModule(UART0_RST);  /* Reset UART0 */

    UART_Open(UART0, 115200);  /* Configure UART0 and set UART0 Baudrate */

}



// Init PWM0 channel 0 to trigger ADC

static void PWM0_Init(void)

{

    // PWM0 frequency is 100Hz, duty 30%

    PWM_ConfigOutputChannel(PWM0, 0, 8000, 30);

        PWM_ConfigOutputChannel(PWM0, 1, 8000, 50);



    // Enable PWM0 channel 0 even zero point to trigger ADC

    PWM_EnableADCTrigger (PWM0, 0, PWM_TRIGGER_ADC_EVEN_ZERO_POINT);

        PWM_EnableOutput(PWM0, 0x2);

    // Start

    PWM_Start(PWM0, 0x3);

}



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();



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



    

        

     printf("八月，新唐你好！\r\n");

           printf("Hello,21IC.com\r\n");

           printf("MyID:yangweiping");

    /*

       This sample code demonstrate PWM0 channel 0 trigger ADC function.

       Configure to ADC single-ended, single mode and enable channel 0.

       Set reference voltage to AVDD.

       Besides, we have to configure PWM to trigger ADC.

       Set PWM0 frequency to 100Hz, duty 30%

       Enable PWM0 channel 0 even zero point to trigger ADC

       Then start PWM0 channel 0.

       Whenever the counter of PWM0 channel 0 is zero,

       PWM sends a request to ADC and ADC will do a conversion.

    */



    // Enable channel 0

    ADC_Open(ADC, ADC_INPUT_MODE_SINGLE_END, ADC_OPERATION_MODE_SINGLE, ADC_CH_0_MASK);



    // Set reference voltage to AVDD

    ADC_SET_REF_VOLTAGE(ADC, ADC_REFSEL_POWER);



    // Power on ADC

    ADC_POWER_ON(ADC);



    // Enable PWM trigger

    ADC_EnableHWTrigger(ADC, ADC_TRIGGER_BY_PWM, 0);



    // Enable ADC ADC_IF interrupt

    ADC_EnableInt(ADC, ADC_ADF_INT);

    // Enable NVIC ADC interrupt

    NVIC_EnableIRQ(ADC_IRQn);



    // Init PWM0

    PWM0_Init();



    while(1);

}



/*** (C) COPYRIGHT 2015 Nuvoton Technology Corp. ***/