103 lines
3.9 KiB
C
103 lines
3.9 KiB
C
/*
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* Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the <organization> nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _GWINOSC_H
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#define _GWINOSC_H
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/**
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* --------------------------- Our Custom GWIN Oscilloscope ---------------
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*
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* This GWIN superset implements a simple audio oscilloscope using the GADC high speed device.
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*
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* It makes many assumptions, the most fundamental of which is that the audio device
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* produces unsigned integer samples.
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*
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* The GMISC module with GMISC_NEED_ARRAYOPS could be used to process the samples more
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* correctly if we were really building something generic.
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*/
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/* The extent of scaling for our audio data - fixed scale at the moment */
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#ifndef SCOPE_Y_BITS
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#define SCOPE_Y_BITS 8 // 8 bits = 0..255
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#endif
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/* Trigger methods */
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#define TRIGGER_NONE 0 /* No triggering */
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#define TRIGGER_POSITIVERAMP 1 /* Trigger on a positive going signal */
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#define TRIGGER_MINVALUE 2 /* Trigger on reaching the minimum value from the last scope */
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/**
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* Which trigger we want to use.
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* Experiments suggests that TRIGGER_MINVALUE gives the best result
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*/
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#ifndef TRIGGER_METHOD
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#define TRIGGER_METHOD TRIGGER_MINVALUE
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#endif
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/* A scope window object. Treat it as a black box */
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typedef struct GScopeObject_t {
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GWindowObject gwin; // Base Class
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coord_t *lastscopetrace; // To store last scope trace
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gfxSem bsem; // We get signalled on this
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audin_sample_t *audiobuf; // To store audio samples
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GEventAudioIn myEvent; // Information on received samples
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coord_t nextx; // Where we are up to
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#if TRIGGER_METHOD == TRIGGER_POSITIVERAMP
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coord_t lasty; // The last y value - used for trigger slope detection
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#elif TRIGGER_METHOD == TRIGGER_MINVALUE
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coord_t lasty; // The last y value - used for trigger slope detection
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coord_t scopemin; // The last scopes minimum value
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#endif
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} GScopeObject;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Create a scope window.
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*/
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GHandle gwinCreateScope(GScopeObject *gs, coord_t x, coord_t y, coord_t cx, coord_t cy, uint16_t channel, uint32_t frequency);
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/**
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* Wait for a scope trace to be ready and then draw it.
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*/
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void gwinWaitForScopeTrace(GHandle gh);
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/**
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* We should also have a special destroy routine here as we have dynamically
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* allocated some memory. There is no point implementing this however as, for
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* this demo, we never destroy the window.
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* _GWINOSC_H */
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