Chris Taylor / SignalGenerator

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.

SignalGenerator.h

Committer:
taylorza
Date:
2014-09-12
Revision:
0:b7c65c0d82d3
Child:
1:4a1bcc41c473

File content as of revision 0:b7c65c0d82d3:

#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__