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TM4C1294KCPDT: CCP Module Enable -TM4C1294KCPDT -Example code

Part Number: TM4C1294KCPDT

Hi,

  I am working with TM4C1294KCPDT controller coustom board . I Need to enable the PL1 pin as CCP pin . For RPM measurement  i need to use CCP module to capture the time between two consecutive pluse . Can you please share with some example code for CCP module enable for TM4C1294KCPDT.

Browsing on CCP moulde example i have got the Keil example code . Please share me code for CCS IDE .

Thanks & regards,

Rani

  • I have tried with below code in keil ide .Please share me configuration for  same  one in  CCS  IDE.

    #include "TM4C123GH6PM.h"
    #include <stdio.h>
    
    
    /*Function prototype for Timer0A and UART module initialization */
    void timer1A_delaySec(int ttime);
    int Timer3A_countCapture(void);
    void Timer3ACounter_init(void);
    void UART5_init(void);
    void UART5_Transmitter(unsigned char data);
    void printstring(char *str);
    
    /* global variables to store and display pulse width or duration */
    unsigned int counter;
    char mesg[12];
    
    /* main code to take RPM measurements and send data to UART terminal */
    
    int main(void)
    {
       Timer3ACounter_init(); 
       UART5_init();
      while(1)
    	{
          TIMER3->CTL |= 1;   /* enable timer3A */
          timer1A_delaySec(1);
          counter = Timer3A_countCapture();
          TIMER3->CTL &= ~1; /* disable TIMER3A during setup */
          TIMER3->TAV = 0;
          TIMER3->TAR = 0;
          sprintf(mesg, "\r\nRPM = %d RPM", counter*60); /* convert float to string */
          printstring(mesg); /* print frequency on serial monitor*/
    	}
    	
    }
    
    /* Configure Timer3A in input-edge counter mode */
    void Timer3ACounter_init(void)
    {
    SYSCTL->RCGCTIMER |= (1<<3);  /* enable clock to Timer Block 3  */
    SYSCTL->RCGCGPIO |= (1<<1);      /* enable clock to PORTB  */
    
    GPIOB->DIR &= ~(1<<2);        /* make PB2 an input pin */
    GPIOB->DEN |= (1<<2);         /* make PB2 a digital pin */
    GPIOB->AFSEL |= (1<<2);       /* enable alternate function on PB2 */
    GPIOB->PCTL &= ~0x00000F00;  /* configure PB2 as T3CCP0 pin */
    GPIOB->PCTL |= 0x00000700;
        
    TIMER3->CTL &= ~(1<<0);  /* disable TIMER3A during setup */
    TIMER3->CFG |= (1<<2);  /* configure as 16-bit timer mode */
    TIMER3->TAMR = 0x13;        /* up-count, edge-count, capture mode */
    TIMER3->TAMATCHR = 0xFFFF;  /* set the count limit */
    TIMER3->TAPMR = 0xFF;	      /* to 0xFFFFFF with prescaler */
    TIMER3->CTL |= ~(1<<3)|~(1<<2); /* capture the rising edge */
    }
    
    /* this routine will execute after every one second */
    
    int Timer3A_countCapture(void)
    {
        return TIMER3->TAR;
    }
    
    
    /* Create one second delay using Timer block 1 and sub timer A */
    
    void timer1A_delaySec(int ttime)
    {
        int i;
        SYSCTL->RCGCTIMER |= 2;     /* enable clock to Timer Block 1 */
        
    TIMER1->CTL = 0;            /* disable Timer before initialization */
        TIMER1->CFG = 0x04;         /* 16-bit option */ 
        TIMER1->TAMR = 0x02;        /* periodic mode and down-counter */
        TIMER1->TAILR = 64000 - 1;  /* TimerA interval load value reg */
        TIMER1->TAPR = 250 - 1;     /* TimerA Prescaler 16MHz/250=64000Hz */
        TIMER1->ICR = 0x1;          /* clear the TimerA timeout flag */
        TIMER1->CTL |= 0x01;        /* enable Timer A after initialization */
    
        for(i = 0; i < ttime; i++)
        {
            while ((TIMER1->RIS & 0x1) == 0) ;      /* wait for TimerA timeout flag */
            TIMER1->ICR = 0x1;      /* clear the TimerA timeout flag */
        }
    }
    void UART5_init(void)
    {
        SYSCTL->RCGCUART |= 0x20;  /* enable clock to UART5 */
        SYSCTL->RCGCGPIO |= 0x10;  /* enable clock to PORTE for PE4/Rx and RE5/Tx */
        /* UART0 initialization */
        UART5->CTL = 0;         /* UART5 module disbable */
        UART5->IBRD = 104;      /* for 9600 baud rate, integer = 104 */
        UART5->FBRD = 11;       /* for 9600 baud rate, fractional = 11*/
        UART5->CC = 0;          /*select system clock*/
        UART5->LCRH = 0x60;     /* data lenght 8-bit, not parity bit, no FIFO */
        UART5->CTL = 0x301;     /* Enable UART5 module, Rx and Tx */
    
        /* UART5 TX5 and RX5 use PE4 and PE5. Configure them digital and enable alternate function */
        GPIOE->DEN = 0x30;      /* set PE4 and PE5 as digital */
        GPIOE->AFSEL = 0x30;    /* Use PE4,PE5 alternate function */
        GPIOE->AMSEL = 0;    /* Turn off analg function*/
        GPIOE->PCTL = 0x00110000;     /* configure PE4 and PE5 for UART */
    }
    void UART5_Transmitter(unsigned char data)  
    {
        while((UART5->FR & (1<<5)) != 0); /* wait until Tx buffer not full */
        UART5->DR = data;                  /* before giving it another byte */
    }
    
    void printstring(char *str)
    {
      while(*str)
    	{
    		UART5_Transmitter(*(str++));
    	}
    }
    
    /* This function is called by the startup assembly code to perform system specific initialization tasks. */
    void SystemInit(void)
    {
        SCB->CPACR |= 0x00F00000;
    }
     

  • Hello Sankareswaran,

    Perhaps below link can help achieve RPM counts, not a simple CCP task if PWM will control fan speed too. BTW register direct loads in your code are discouraged, not easily supported in this forum.

    Unstable low frequency interrupts occurring GPTM timer edge capture counts. - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

    Regards,

  • Hello Rani,

    I have been working to put together a TivaWare example for this but I haven't got it fully working yet so I will try and finish that tomorrow afternoon and post it here.

    Best Regards,

    Ralph Jacobi

  • Hello Rani,

    Here is the completed TivaWare example you can reference for how to setup a Timer for CCP monitoring to track the time between two rising edges.

    edge_time.zip

    Best Regards,

    Ralph Jacobi

  • Ralph Jacobi,

          i have import the code  , when I am  building the code getting below error. Where i can find these two file   "inc/hw_ints.h ,"inc/hw_nvic.h" .

    Thanks & Regards,

    Rani 

  • Hello Rani,

    If you don't have TivaWare 2.2.0 installed, I would recommend downloading and installing it or you'll have more build errors likely. If its installed outside of c:\ti then you just need to update the path for SW_ROOT in the CCS project settings under Resource -> Linked Resources

    Both those files are from TivaWare and located at: [Install Path]\TivaWare_C_Series-2.2.0.295\inc

    Best Regards,

    Ralph Jacobi