90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/*
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ChibiOS/GFX - Copyright (C) 2012, 2013
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS/GFX.
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ChibiOS/GFX is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/GFX is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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/* 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 7 // 7 bits = 0..128
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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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BinarySemaphore bsem; // We get signalled on this
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adcsample_t *audiobuf; // To store audio samples
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GEventADC 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, uint32_t physdev, 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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