Chris Taylor
Provides a simple way to generate complex square wave signals on any available pin. In addition the SignalGenerator can generate a carrier wave which is useful when generating IR signals to control electronic devices like a TV etc. The signal generation can be carried out either synchronously or asynchronously. In the case of synchronous signal generation all interrupts can optionally be disabled to improve timing accuracy.
Diff: SignalGenerator.h
- Revision:
- 0:b7c65c0d82d3
- Child:
- 1:4a1bcc41c473
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SignalGenerator.h Fri Sep 12 04:04:46 2014 +0000
@@ -0,0 +1,27 @@
+#ifndef __SIGNALGENERATOR_H__
+#define __SIGNALGENERATOR_H__
+
+/** Simplifies generation of a high frequency signal on any pin with optional support for a carrier frequency.
+*/
+class SignalGenerator
+{
+ public:
+ /** Create a SignalGenerator tied to the specified pin. */
+ SignalGenerator(PinName pin);
+
+ /** Set the state of the pin associated with the SignalGenerator. */
+ void set(bool pinState);
+
+ /** Set parameter and generate the corresponding signal on the pin associated with the SignalGenerator.
+ * @param initialState Defines the initial state of the signal pin
+ * @param timingBuffer Specificies the wime periods in microseconds before the signal pin changes state
+ * @param bufferCount The count of transition times passed in the timingBuffer
+ * @param lastStateHoldTime The time in microseconds that the last state is held
+ * @param carrierFrequency The carrier frequency in Hz
+ */
+ void set(bool initialState, uint32_t timingBuffer[], uint16_t bufferCount, uint32_t lastStateHoldTime = 0, int carrierFrequency = -1);
+ private:
+ DigitalOut _pin;
+};
+
+#endif //__SIGNALGENERATOR_H__
\ No newline at end of file