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This commit is contained in:
Gordon Henderson
2013-03-24 20:04:07 +00:00
committed by Philip Howard
parent dda3305ce1
commit 3fbc564d00
41 changed files with 1829 additions and 425 deletions
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31
examples/wfi.c
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@@ -2,7 +2,17 @@
* wfi.c:
* Wait for Interrupt test program
*
* Copyright (c) 2012 Gordon Henderson.
* This program demonstrates the use of the waitForInterrupt()
* function in wiringPi. It listens to a button input on
* BCM_GPIO pin 17 (wiringPi pin 0)
*
* The biggest issue with this method is that it really only works
* well in Sys mode.
*
* Jan 2013: This way of doing things is sort of deprecated now, see
* the wiringPiISR() function instead and the isr.c test program here.
*
* Copyright (c) 2012-2013 Gordon Henderson.
***********************************************************************
* This file is part of wiringPi:
* https://projects.drogon.net/raspberry-pi/wiringpi/
@@ -33,9 +43,8 @@
#define COUNT_KEY 0
// What BCM_GPIO input are we using?
// GPIO 0 is one of the I2C pins with an on-board pull-up
#define BUTTON_PIN 0
#define BUTTON_PIN 17
// Debounce time in mS
@@ -63,13 +72,11 @@ PI_THREAD (waitForIt)
int debounceTime = 0 ;
(void)piHiPri (10) ; // Set this thread to be high priority
digitalWrite (18, 1) ;
for (;;)
{
if (waitForInterrupt (BUTTON_PIN, -1) > 0) // Got it
{
// Bouncing?
if (millis () < debounceTime)
@@ -80,7 +87,6 @@ PI_THREAD (waitForIt)
// We have a valid one
digitalWrite (17, state) ;
state ^= 1 ;
piLock (COUNT_KEY) ;
@@ -89,7 +95,7 @@ PI_THREAD (waitForIt)
// Wait for key to be released
while (digitalRead (0) == LOW)
while (digitalRead (BUTTON_PIN) == LOW)
delay (1) ;
debounceTime = millis () + DEBOUNCE_TIME ;
@@ -108,11 +114,9 @@ void setup (void)
{
// Use the gpio program to initialise the hardware
// (This is the crude, but effective bit)
// (This is the crude, but effective)
system ("gpio edge 0 falling") ;
system ("gpio export 17 out") ;
system ("gpio export 18 out") ;
system ("gpio edge 17 falling") ;
// Setup wiringPi
@@ -120,9 +124,8 @@ void setup (void)
// Fire off our interrupt handler
piThreadCreate (waitForIt) ;
piThreadCreate (waitForIt) ;
digitalWrite (17, 0) ;
}
@@ -147,7 +150,7 @@ int main (void)
piLock (COUNT_KEY) ;
myCounter = globalCounter ;
piUnlock (COUNT_KEY) ;
delay (5000) ;
delay (500) ;
}
printf (" Done. myCounter: %5d\n", myCounter) ;