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Counter 32bit 1 channel (max 1.5MHz).

// Built with BFTC Rev. 1.0.0, lun 25 agosto 2014 14:19:58

/*
    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 Nome-Programma.  If not, see <http://www.gnu.org/licenses/>.
*/

// Show how to implement a simple fast counter on port PG0.
// The counter is capable to count with a frequency higher then 1.5MHz
// 
#include "main.h"

unsigned counter = 0;

// Interrupt service procedure
//
void PGCallback()
{
    counter++;
    // Clear the interrupt request
    *pPORTGIO_CLEAR = PG0;
}

unsigned char Menu()
{
    printf("\n");
    printf("COMMANDS ******************\n");
    printf("0 - Clear counts\n");
    printf("D - Display counts\n");
    printf("> ");
    return GetChar_Uart0();
}

int main(void)
{
    int         com;
    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, PGCallback);
    Set_PortGInterruptEnable(PG0, true);
    while(1)            // Main loop
    {
        com = Menu();
        switch(com)
        {
            case '0':   counter = 0;
                        break;
            case 'D':   printf("%8u\n", counter);
                        break;
        }
    }
    return 0;
}

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