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Diffstat (limited to 'demos/modules/gadc/gwinosc.h')
-rw-r--r-- | demos/modules/gadc/gwinosc.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/demos/modules/gadc/gwinosc.h b/demos/modules/gadc/gwinosc.h new file mode 100644 index 00000000..ec44937d --- /dev/null +++ b/demos/modules/gadc/gwinosc.h @@ -0,0 +1,89 @@ +/* + ChibiOS/GFX - Copyright (C) 2012, 2013 + Joel Bodenmann aka Tectu <joel@unormal.org> + + This file is part of ChibiOS/GFX. + + ChibiOS/GFX is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + ChibiOS/GFX is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef _GWINOSC_H +#define _GWINOSC_H + +/** + * --------------------------- Our Custom GWIN Oscilloscope --------------- + * + * This GWIN superset implements a simple audio oscilloscope using the GADC high speed device. + */ + +/* The extent of scaling for our audio data - fixed scale at the moment */ +#ifndef SCOPE_Y_BITS + #define SCOPE_Y_BITS 7 // 7 bits = 0..128 +#endif + +/* Trigger methods */ +#define TRIGGER_NONE 0 /* No triggering */ +#define TRIGGER_POSITIVERAMP 1 /* Trigger on a positive going signal */ +#define TRIGGER_MINVALUE 2 /* Trigger on reaching the minimum value from the last scope */ + +/** + * Which trigger we want to use. + * Experiments suggests that TRIGGER_MINVALUE gives the best result + */ +#ifndef TRIGGER_METHOD + #define TRIGGER_METHOD TRIGGER_MINVALUE +#endif + +/* A scope window object. Treat it as a black box */ +typedef struct GScopeObject_t { + GWindowObject gwin; // Base Class + + coord_t *lastscopetrace; // To store last scope trace + BinarySemaphore bsem; // We get signalled on this + adcsample_t *audiobuf; // To store audio samples + GEventADC myEvent; // Information on received samples + coord_t nextx; // Where we are up to +#if TRIGGER_METHOD == TRIGGER_POSITIVERAMP + coord_t lasty; // The last y value - used for trigger slope detection +#elif TRIGGER_METHOD == TRIGGER_MINVALUE + coord_t lasty; // The last y value - used for trigger slope detection + coord_t scopemin; // The last scopes minimum value +#endif + } GScopeObject; + +#ifdef __cplusplus +extern "C" { +#endif + + /** + * Create a scope window. + */ + GHandle gwinCreateScope(GScopeObject *gs, coord_t x, coord_t y, coord_t cx, coord_t cy, uint32_t physdev, uint32_t frequency); + + /** + * Wait for a scope trace to be ready and then draw it. + */ + void gwinWaitForScopeTrace(GHandle gh); + + /** + * We should also have a special destroy routine here as we have dynamically + * allocated some memory. There is no point implementing this however as, for + * this demo, we never destroy the window. + */ + +#ifdef __cplusplus +} +#endif + +#endif /* _GWINOSC_H */ |