Jonathan Gaul / DigitalOutEx

Provides an extended version of DigitalOut that adds a "toggle()" function, and uses the RTOS Thread API to provide a "flash()" function that toggles the pin in the background at a given interval.

Dependents:   Car_Simulator

Example of use:

#include "mbed.h"
#include "rtos.h"    /* NOTE: Requires the RTOS library or a matching API */
#include "DigitalOutEx.h"

DigitalOutEx led1(LED1);
DigitalOutEx led2(LED2);

int main() {
    
    led1.flash(200);
    led2.flash(500);
    
    Thread::wait(5000);
    
    led1.flash(50);
    
    Thread::wait(5000);
    
    led1 = 0;
    
    Thread::wait(5000);
    
    led1.flash(1000);
    
    while (1) { }    
}

Diff: DigitalOutEx.cpp

Revision:
0:1798e1bf583a
Child:
1:6f8ca7b70778
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DigitalOutEx.cpp	Fri Apr 26 10:31:31 2013 +0000
@@ -0,0 +1,46 @@
+
+#include "DigitalOutEx.h"
+
+DigitalOutEx::DigitalOutEx(PinName pin)
+    : DigitalOut(pin), 
+      _flashThread(NULL),
+      _flashing(0),
+      _flashInterval(200) {  
+}
+
+void DigitalOutEx::write(int value) {
+    DigitalOut::write(value);
+    if (_flashing) {
+        stop_flashing();
+    }
+}
+
+void DigitalOutEx::flash(int intervalMs) {
+    _flashInterval = intervalMs;
+    if (_flashing) return;
+        
+    _flashThread = new Thread(DigitalOutEx::_flash_thread, this);        
+}
+
+void DigitalOutEx::stop_flashing() {
+    if (!_flashing) return;
+    
+    _flashThread->terminate();
+    _flashThread = NULL;
+    _flashing = 0;
+}
+
+DigitalOutEx &DigitalOutEx::operator=(int value) {    
+    write(value);
+    return *this;
+}
+
+void DigitalOutEx::_flash_thread(const void *argument) {
+    DigitalOutEx *out = (DigitalOutEx *)argument;
+    out->_flashing = 1;
+    while (1) {
+        // use the base class, as DigitalOutEx's write() stops the flashing for us
+        ((DigitalOut *)out)->write(!out->read());        
+        Thread::wait(((DigitalOutEx *)argument)->_flashInterval);
+    }
+}
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