91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
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/*
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* Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
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* Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
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*
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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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/**
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* This demo demonstrates the use of the GAUDIN module to read audio channel 0.
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* The audio channel gets read to display a very simple oscilloscope.
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*
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* It also demonstrates how to write your own custom GWIN window type.
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*/
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#include "gfx.h"
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/* Include our custom gwin audio oscilloscope */
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#include "gwinosc.h"
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/* Specify our timing parameters */
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#define MY_AUDIO_FREQUENCY 8000 /* 8khz. If this is too much try 4000 (4khz) */
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#define MY_AUDIO_CHANNEL 0 /* Use channel 0 - must be a mono channel */
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#define MY_AUDIO_FORMAT GAUDIO_RECORD_FORMAT1 /* The default format */
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/* Data */
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static GScopeObject gScopeWindow;
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/*
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* Application entry point.
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*/
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int main(void) {
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GHandle ghScope;
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gCoord swidth, sheight;
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gfxInit();
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/**
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* Allocate audio buffers - eg. 4 x 128 byte buffers.
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* You may need to increase this for slower cpu's.
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* You may be able to decrease this for low latency operating systems.
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* 8 x 256 seems to work on the really slow Olimex SAM7EX256 board (display speed limitation) @8kHz
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* If your oscilloscope display stops then it is likely that your driver has stalled due to running
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* out of free buffers. Increase the number of buffers..
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*/
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gfxBufferAlloc(8, 256);
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/* Get the screen dimensions */
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swidth = gdispGetWidth();
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sheight = gdispGetHeight();
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/* Set up the scope window to fill the screen */
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{
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GWindowInit wi;
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gwinClearInit(&wi);
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wi.show = gTrue;
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wi.x = wi.y = 0;
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wi.width = swidth; wi.height = sheight;
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ghScope = gwinScopeCreate(&gScopeWindow, &wi, MY_AUDIO_CHANNEL, MY_AUDIO_FREQUENCY, MY_AUDIO_FORMAT);
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}
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gwinSetBgColor(ghScope, GFX_WHITE);
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gwinSetColor(ghScope, GFX_RED);
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gwinClear(ghScope);
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/* Just keep displaying the scope traces */
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while (1) {
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gwinScopeWaitForTrace(ghScope);
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}
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}
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