// 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;
}