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:
2014-09-13
Revision:
3:f30dcc6e8e70
Parent:
2:b2a449bd787f
Child:
4:64d2d834341b

File content as of revision 3:f30dcc6e8e70:

///////////////////////////////////////////////////////////////////////////////
// Signal Generator
// Author: Chris Taylor (taylorza)
#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, 
            int32_t carrierFrequency = -1);
            
    private:
        DigitalOut  _pin;    
};
#endif //__SIGNALGENERATOR_H__