[DemoCode下载] PWM触发ADC采样，通过PDMA传输采样结果

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

 * [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]    Demonstrate how to trigger ADC by PWM and transfer conversion data by PDMA.

 *

 * 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, g_u32COVNUMFlag = 0;

volatile uint32_t g_u32IsTestOver = 0;

int16_t  g_i32ConversionData[6] = {0};

uint32_t g_u32SampleModuleNum = 0;





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 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Set both PCLK0 and PCLK1 as HCLK/2 */

    CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);



    /* 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 PWM0 module clock */

    CLK_EnableModuleClock(PWM0_MODULE);



    /* Enable ADC module clock */

    CLK_EnableModuleClock(ADC_MODULE);



    /* ADC clock source is PCLK1, set divider to 1 */

    CLK_SetModuleClock(ADC_MODULE, CLK_CLKSEL2_ADCSEL_PCLK1, CLK_CLKDIV0_ADC(1));



    /* Enable PDMA clock source */

    CLK_EnableModuleClock(PDMA_MODULE);



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                              */

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

    /* Set PB multi-function pins for UART0 RXD=PB.6 and TXD=PB.4 */

    SYS->GPB_MFP1 = (SYS->GPB_MFP1 & ~(SYS_GPB_MFP1_PB4MFP_Msk | SYS_GPB_MFP1_PB6MFP_Msk)) |

                    (SYS_GPB_MFP1_PB4MFP_UART0_TXD | SYS_GPB_MFP1_PB6MFP_UART0_RXD);



    /* Set PA.2, PC.0 to input mode */

    GPIO_SetMode(PA, BIT2, GPIO_MODE_INPUT);

    GPIO_SetMode(PC, BIT0, GPIO_MODE_INPUT);



    /* Configure the PA.2, PC.0 ADC analog input pins.  */

    SYS->GPA_MFP0 = (SYS->GPA_MFP0 & ~(SYS_GPA_MFP0_PA2MFP_Msk)) |

                    (SYS_GPA_MFP0_PA2MFP_ADC0_CH2);

    SYS->GPC_MFP0 = (SYS->GPC_MFP0 & ~(SYS_GPC_MFP0_PC0MFP_Msk)) |

                    (SYS_GPC_MFP0_PC0MFP_ADC0_CH3);



    /* Disable the PA.2, PC.0 digital input path to avoid the leakage current. */

    GPIO_DISABLE_DIGITAL_PATH(PA, BIT2);

    GPIO_DISABLE_DIGITAL_PATH(PC, BIT0);



    /* Lock protected registers */

    SYS_LockReg();

}



void PWM0_Init()

{

    /* Set PWM0 timer clock prescaler */

    PWM_SET_PRESCALER(PWM0, 0, 0);



    /* Set up counter type */

    PWM0->CTL1 &= ~PWM_CTL1_CNTTYPE0_Msk;



    /* Set PWM0 timer duty */

    PWM_SET_CMR(PWM0, 0, 108);



    /* Set PWM0 timer period */

    PWM_SET_CNR(PWM0, 0, 216);



    /* PWM period point trigger ADC enable */

    PWM_EnableADCTrigger(PWM0, 0, PWM_TRIGGER_ADC_EVEN_PERIOD_POINT);



    /* Set output level at zero, compare up, period(center) and compare down of specified channel */

    PWM_SET_OUTPUT_LEVEL(PWM0, BIT0, PWM_OUTPUT_HIGH, PWM_OUTPUT_LOW, PWM_OUTPUT_NOTHING, PWM_OUTPUT_NOTHING);



    /* Enable output of PWM0 channel 0 */

    PWM_EnableOutput(PWM0, BIT0);

}



void PDMA_Init()

{

    /* Configure PDMA peripheral mode form ADC to memory */

    /* Open Channel 1 */

    PDMA_Open(PDMA, BIT1);



    /* transfer width is half word(16 bit) and transfer count is 6 */

    PDMA_SetTransferCnt(PDMA, 1, PDMA_WIDTH_16, 6);



    /* Set source address as ADC PDMA Current Transfer Data register (no increment) and destination address as g_i32ConversionData array (increment) */

    PDMA_SetTransferAddr(PDMA, 1, (uint32_t)&ADC->ADPDMA, PDMA_SAR_FIX, (uint32_t)g_i32ConversionData, PDMA_DAR_INC);



    /* Select PDMA request source as ADC RX */

    PDMA_SetTransferMode(PDMA, 1, PDMA_ADC_RX, FALSE, 0);



    /* Set PDMA as single request type for ADC */

    PDMA_SetBurstType(PDMA, 1, PDMA_REQ_SINGLE, PDMA_BURST_4);



    PDMA_EnableInt(PDMA, 1, PDMA_INT_TRANS_DONE);

    NVIC_EnableIRQ(PDMA_IRQn);

}



void ReloadPDMA()

{

    /* transfer width is half word(16 bit) and transfer count is 6 */

    PDMA_SetTransferCnt(PDMA, 1, PDMA_WIDTH_16, 6);



    /* Select PDMA request source as ADC RX */

    PDMA_SetTransferMode(PDMA, 1, PDMA_ADC_RX, FALSE, 0);

}



void ADC_FunctionTest()

{

    uint8_t  u8Option;



    printf("\n");

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

    printf("|   PWM trigger mode and transfer ADC conversion data by PDMA test     |\n");

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



    printf("\nIn this test, software will get 6 conversion result from the specified channel.\n");



    /* Enable ADC converter */

    ADC_POWER_ON(ADC);



    while(1)

    {

        /* reload PDMA configuration for next transmission */

        ReloadPDMA();



        printf("Select input mode:\n");

        printf("  [1] Single end input (channel 2 only)\n");

        printf("  [2] Differential input (channel pair 1 only (channel 2 and 3))\n");

        printf("  Other keys: exit single mode test\n");

        u8Option = getchar();

        if(u8Option == '1')

        {

            /* Set input mode as single-end, Single mode, and select channel 2 */

            ADC_Open(ADC, ADC_ADCR_DIFFEN_SINGLE_END, ADC_ADCR_ADMD_SINGLE, BIT2);



            /* Configure the sample module and enable PWM0 trigger source */

            ADC_EnableHWTrigger(ADC, ADC_ADCR_TRGS_PWM, 0);



            /* ADC enable PDMA transfer */

            ADC_ENABLE_PDMA(ADC);



            printf("Conversion result of channel 2:\n");



            /* Enable PWM0 channel 0 counter */

            PWM_Start(PWM0, PWM_CH_0_MASK);



            while(1)

            {

                /* Wait PDMA interrupt (g_u32IsTestOver will be set at IRQ_Handler function) */

                while(g_u32IsTestOver == 0);

                break;

            }

            g_u32IsTestOver = 0;



            /* Disable PWM0 channel 0 counter */

            PWM_ForceStop(PWM0, BIT0);  /* PWM0 counter stop running. */



            for(g_u32COVNUMFlag = 0; (g_u32COVNUMFlag) < 6; g_u32COVNUMFlag++)

                printf("                                0x%X (%d)\n", g_i32ConversionData[g_u32COVNUMFlag], g_i32ConversionData[g_u32COVNUMFlag]);

        }

        else if(u8Option == '2')

        {

            /* Set input mode as differential, Single mode, and select channel 2 */

            ADC_Open(ADC, ADC_ADCR_DIFFEN_DIFFERENTIAL, ADC_ADCR_ADMD_SINGLE, BIT2);



            /* Configure the sample module and enable PWM0 trigger source */

            ADC_EnableHWTrigger(ADC, ADC_ADCR_TRGS_PWM, 0);



            /* ADC enable PDMA transfer */

            ADC_ENABLE_PDMA(ADC);



            printf("Conversion result of channel 2:\n");



            /* Enable PWM0 channel 0 counter */

            PWM_Start(PWM0, PWM_CH_0_MASK);



            while(1)

            {

                /* Wait PDMA interrupt (g_u32IsTestOver will be set at IRQ_Handler function) */

                while(g_u32IsTestOver == 0);

                break;

            }

            g_u32IsTestOver = 0;



            /* Disable EPWM0 channel 0 counter */

            PWM_ForceStop(PWM0, BIT0);  /* PWM0 counter stop running. */



            for(g_u32COVNUMFlag = 0; (g_u32COVNUMFlag) < 6; g_u32COVNUMFlag++)

                printf("                                0x%X (%d)\n", g_i32ConversionData[g_u32COVNUMFlag], g_i32ConversionData[g_u32COVNUMFlag]);

        }

        else

            return;

    }

}



void PDMA_IRQHandler(void)

{

    uint32_t status = PDMA_GET_INT_STATUS(PDMA);



    if(status & PDMA_INTSTS_ABTIF_Msk)    /* abort */

    {

        if(PDMA_GET_ABORT_STS(PDMA) & PDMA_ABTSTS_ABTIF1_Msk)

            g_u32IsTestOver = 2;

        PDMA_CLR_ABORT_FLAG(PDMA, PDMA_ABTSTS_ABTIF1_Msk);

    }

    else if(status & PDMA_INTSTS_TDIF_Msk)      /* done */

    {

        if(PDMA_GET_TD_STS(PDMA) & PDMA_TDSTS_TDIF1_Msk)

            g_u32IsTestOver = 1;

        PDMA_CLR_TD_FLAG(PDMA, PDMA_TDSTS_TDIF1_Msk);

    }

    else

        printf("unknown PDMA interrupt !!\n");

}



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

/* 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();



    /* Init PWM for ADC */

    PWM0_Init();



    /* Init PDMA for ADC */

    PDMA_Init();



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



    /* ADC function test */

    ADC_FunctionTest();



    /* Disable ADC IP clock */

    CLK_DisableModuleClock(ADC_MODULE);



    /* Disable PWM0 IP clock */

    CLK_DisableModuleClock(PWM0_MODULE);



    /* Disable PDMA clock source */

    CLK_DisableModuleClock(PDMA_MODULE);



    /* Disable PDMA Interrupt */

    NVIC_DisableIRQ(PDMA_IRQn);



    printf("Exit ADC sample code\n");



    while(1);

}