风扇调速应用

发表于 2019-10-17 09:49

利用Timer0 Capture 捕捉风扇转速，再以PWM2调整风扇速度。这样就可以构成一个控制回路了。

发表于 2019-10-17 09:49



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

 * [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: 13/10/07 3:54p $ 

 * [url=home.php?mod=space&uid=247401]@brief[/url]    PWM sample for Mini51 series MCU

 *

 * @note

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

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

#include <stdio.h>

#include "Mini51Series.h"









void SYS_Init(void)

{

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

/* Init System Clock                                                                                       */

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



    /* Unlock protected registers */

    while(SYS->RegLockAddr != 1) {

        SYS->RegLockAddr = 0x59;

        SYS->RegLockAddr = 0x16;

        SYS->RegLockAddr = 0x88;

    }



    /* Enable external 12MHz XTAL, internal 22.1184MHz */

    CLK->PWRCON = CLK_PWRCON_IRC22M_EN_Msk;



    /* Waiting for clock ready */

    while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_IRC22M_STB_Msk));



    /* Enable IP clock */

    CLK->APBCLK = CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_PWM23_EN_Msk;



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();





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

/* Init I/O Multi-function                                                                                 */

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

    /* Set P1 multi-function pins for UART RXD, TXD */

    SYS->P0_MFP = SYS_MFP_P00_TXD | SYS_MFP_P01_RXD;



    /* Set P2 multi-function pins for PWM Channel */

    SYS->P2_MFP = SYS_MFP_P24_PWM2;





    /* Lock protected registers */

    SYS->RegLockAddr = 0;

}



void UART_Init(void)

{

    // Set UART to 8 bit character length, 1 stop bit, and no parity 

    UART->LCR = UART_LCR_WLS_Msk;        

    // 22.1184 MHz reference clock input, for 115200 bps

    // 22118400 / 115200 = 192. Using mode 2 to calculate baudrate, 192 - 2 = 190 = 0xBE

    UART->BAUD = UART_BAUD_DIV_X_EN_Msk | UART_BAUD_DIV_X_ONE_Msk | (0xBE);          

}



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 UART to 115200-8n1 for print message */

    UART_Init();



    printf("\nThis sample code will output PWM channel 0 to output waveform\n"); 

    printf("using double buffer feature.\n");

        

    /* 

        PWM channel 0 wave form of this sample showns below:



        |<-        CNR + 1  clk     ->|  CNR + 1 = 199 + 1 CLKs  

                       |<-CMR+1 clk ->|  CMR + 1 = 99 + 1 CLKs

                                      |<-   CNR + 1  ->|  CNR + 1 = 99 + 1 CLKs   

                                               |<CMR+1>|  CMR + 1 = 39 + 1 CLKs

         ______________                ________         _____

      __|      100     |_____100______|  60    |__40___|     PWM waveform

       

    */



    



    // Set channel 0 perscaler to 2. Actual value fill into register needs to minus 1.

    PWM->PPR = 0x0100;

    // Set channel 0 clock divider to 1

    PWM->CSR = PWM_CLK_DIV_1 << PWM_CSR_CSR2_Pos;

    // Enable PWM channel 0 auto-reload mode

    PWM->PCR = PWM_PCR_CH2MOD_Msk;

    /* 

      Configure PWM channel 1 init period and duty. 

      Period is HCLK / (perscaler * clock divider * (CNR + 1))

      Duty ratio = (CMR + 1) / (CNR + 1)

      Period = 22.1184 MHz / (1 * 1 * (1B9 + 1)) =  25000 Hz

      Duty ratio = (99 + 1) / (199 + 1) = 50%

    */

    PWM->CMR[2] = 0xB9;

    PWM->CNR[2] = 0x1B9;   



    

    // Enable PWM channel 2 output

    PWM->POE = PWM_POE_PWM2_Msk;

    

    // Start

    PWM->PCR |= PWM_PCR_CH2EN_Msk;

    

    while(1);



}



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

发表于 2019-10-17 09:49

复制



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

 * @file     main.c

 * @version  V1.00

 * $Revision: 3 $

 * $Date: 13/10/07 3:54p $

 * @brief    Timer sample for Mini51 series MCU

 *

 * @note

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

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

#include <stdio.h>

#include "Mini51Series.h"



uint32_t TCAP0_old;

void TMR0_IRQHandler(void)

{    

    uint32_t TCAP0_tmp = TIMER0->TCAP;

        printf("%d\n\r",(12000000/(TCAP0_tmp*2))*60);

        /*

         if(TCAP0_tmp==0)

         {

                 printf("cap:0\n\r");

                 }

          if(TCAP0_old!=TCAP0_tmp)

                {

                        printf("%d\n\r",TCAP0_tmp-TCAP0_old);

                        TCAP0_old=TCAP0_tmp;

                        }

    */

    TIMER0->TEXISR = TIMER_TEXISR_TEXIF_Msk;



}





void SYS_Init(void)

{

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

/* Init System Clock                                                                                       */

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



    /* Unlock protected registers */

    while(SYS->RegLockAddr != 1) {

        SYS->RegLockAddr = 0x59;

        SYS->RegLockAddr = 0x16;

        SYS->RegLockAddr = 0x88;

    }

    SYS->P5_MFP=0X03;

    /* Enable external 12MHz XTAL (UART), and internal 22.1184MHz */

    CLK->PWRCON = CLK_PWRCON_XTL12M | CLK_PWRCON_IRC22M_EN_Msk;



    /* Waiting for clock ready */

    while((CLK->CLKSTATUS & (CLK_CLKSTATUS_IRC22M_STB_Msk |CLK_CLKSTATUS_XTL_STB_Msk)) != 

                    (CLK_CLKSTATUS_IRC22M_STB_Msk |CLK_CLKSTATUS_XTL_STB_Msk));



    /* Enable UART and Timer 0 clock */

    CLK->APBCLK = CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_TMR0_EN_Msk;



    /* Select Timer 0 clock source from external crystal*/

    CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_TMR0_S_Msk) | CLK_CLKSEL1_TMR0_S_XTAL;



    /* Update System Core Clock */

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

    SystemCoreClockUpdate();





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

/* Init I/O Multi-function                                                                                 */

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

    /* Set P1 multi-function pins for UART RXD, TXD */

    SYS->P0_MFP = SYS_MFP_P00_TXD | SYS_MFP_P01_RXD;



    /* Set P3 multi function pin for Timer 0 capture pin */

    SYS->P3_MFP = SYS_MFP_P32_T0EX;



    /* Lock protected registers */

    SYS->RegLockAddr = 0;

}



void UART_Init(void)

{

    // Set UART to 8 bit character length, 1 stop bit, and no parity 

    UART->LCR = UART_LCR_WLS_Msk;        

    // 22.1184 MHz reference clock input, for 115200 bps

    // 22118400 / 115200 = 192. Using mode 2 to calculate baudrate, 192 - 2 = 190 = 0xBE

    UART->BAUD = UART_BAUD_DIV_X_EN_Msk | UART_BAUD_DIV_X_ONE_Msk | (0xBE);          

}



int main(void)

{

    int volatile i;



    /* 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 UART to 115200-8n1 for print message */

    UART_Init();



    printf("\nThis sample code demonstrat timer trigger counting mode.\n");

    printf("Please connect input source with Timer 0 capture pin T0EX (P3.2), press any key to continue\n");

    //getchar();





    TIMER0->TCSR = TIMER_TCSR_CEN_Msk | TIMER_TCSR_TDR_EN_Msk|TIMER_CONTINUOUS_MODE | 0;



    // Set compare value as large as possible

    TIMER0->TCMPR = 0xFFFFFF;



    // Configure Timer 0 trigger counting mode, capture TDR value on falling edge, enable capture interrupt

    TIMER0->TEXCON = TIMER_TEXCON_CAP_MODE_Msk|

                                 TIMER_CAPTURE_TRIGGER_COUNTING_MODE | 

                     TIMER_CAPTURE_FALLING_EDGE | 

                     TIMER_TEXCON_TEXIEN_Msk |

                     TIMER_TEXCON_TEXEN_Msk| 

                                                                                 TIMER_TEXCON_TEXDB_Msk;

          



    NVIC_EnableIRQ(TMR0_IRQn);



    while(1);



}



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

发表于 2019-10-17 09:50

[Mini51][APP]DC_Fan_Speed_Control.zip (451.35 KB, 下载次数: 6)

发表于 2019-10-17 11:12

每次增加量多少，这个应该属于PID调节的范畴吧

发表于 2019-10-17 11:13

我要照着这个写一个试试

发表于 2019-10-17 20:54

看一下响应速度如何。

发表于 2019-10-18 00:33

PWM如果封装起来就行了。

发表于 2019-10-18 08:45

没看太明白，再看看。

发表于 2019-10-20 21:24

没看到闭环控制啊。

发表于 2019-11-19 12:47

非常感谢楼主分享

[应用方案] 风扇调速应用

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