// Built with BFTC Rev. 1.0.0, lun 25 agosto 2014 16:16:16

/*

    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 frequency meter on port PG0.

// The meter is capable to work 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;

}

void gateCallback()

{

Set_PortGInterruptEnable(PG0, false);

printf("FREQUENCY = %6d Hz\n", counter);

counter = 0;

Set_PortGInterruptEnable(PG0, true);

}

unsigned char Menu()

{

printf("\n");

printf("COMMANDS ******************\n");

printf("0 - Time base 1s\n");

printf("1 - Time base 0.1s\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);

Set_TimerInterruptService(TIMER_0, &gateCallback, 1000000); // Gate 1s

Set_TimerEnable(TIMER_0, true);

while(1) // Main loop

{

com = Menu();

switch(com)

{

case '0': Set_TimerInterruptService(TIMER_0, &gateCallback, 1000000); // Gate 1s

break;

case '1': Set_TimerInterruptService(TIMER_0, &gateCallback, 100000); // Gate 0.1s

break;

}

}

return 0;

}