// Built with BFTC Rev. 1.0.0, mar 26 agosto 2014 13:58:59

/*

    Copyright 2014 Digital Technology Art SRL

    This file is part of Blackfin Toolchain (BFTC) project.

 

    BFTC is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

 

    BFTC is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

 

    You should have received a copy of the GNU General Public License

    along with Name-Program.  If not, see <http://www.gnu.org/licenses/>.

*/

 

// Simple program that show how to implement a period meter on PG0 port

// it use a 32 bit counter with a time base of 10ns

// Maximum period length is approx 42s

// Period measure start on the rising edge

//

#include "main.h"

 

#define ST st = Get_TimerCounter(TIMER_0)

#define ET et = Get_TimerCounter(TIMER_0)

 

#define TIMEBASE 0xFFFFFFFF

 

bool edge = true, done = false;

unsigned int st, et;

 

void display()

{

    unsigned tx;

    if(st > et)

       tx = TIMEBASE - st + et;

    else

       tx = et - st;

    printf("Period: %u us ms\n", tx / 100.0);

}

 

// Interrupt service procedure

//

void PortCallback()

{

    if(edge)

   {

       ST;

       // Set for falling

       *pPORTGIO_POLAR |= PG0;

       edge = false;

   }

   else

   {

       ET;

       // Set for rising

       *pPORTGIO_POLAR &= (~PG0);

       edge = true;

   }

    // Clear the interrupt request

    *pPORTGIO_CLEAR = PG0;

}

 

int main(void)

{

    Set_PLL(16, 4);     // CORE: 25MHz * 16 = 400MHz, SCLK: 400MHz / 4 = 100MHz

    Set_Port();         // Set the port according to project set

    Set_Uart0(115200);  // printf is redirected to UART0

   

    // Set an interrupt on the rising edge of the PG0 port

    Set_PortGInterruptService(PG0, PortCallback);

    Set_PortGInterruptEnable(PG0, true);

   Set_TimerCounter(TIMER_0);

    Set_TimerEnable(TIMER_0, true);

  

    while(1)            // Main loop

    {

       if(done)

       {

           display();

           done = false;

       }

    }

    return 0;

}