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/*
* Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
* Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* This demo demonstrates the use of the GAUDIN module to read audio channel 0.
* The audio channel gets read to display a very simple oscilloscope.
*
* It also demonstrates how to write your own custom GWIN window type.
*/
#include "gfx.h"
/* Include our custom gwin audio oscilloscope */
#include "gwinosc.h"
/* Specify our timing parameters */
#define MY_AUDIO_FREQUENCY 8000 /* 8khz. If this is too much try 4000 (4khz) */
#define MY_AUDIO_CHANNEL 0 /* Use channel 0 - must be a mono channel */
#define MY_AUDIO_FORMAT GAUDIO_RECORD_FORMAT1 /* The default format */
/* Data */
static GScopeObject gScopeWindow;
/*
* Application entry point.
*/
int main(void) {
GHandle ghScope;
gCoord swidth, sheight;
gfxInit();
/**
* Allocate audio buffers - eg. 4 x 128 byte buffers.
* You may need to increase this for slower cpu's.
* You may be able to decrease this for low latency operating systems.
* 8 x 256 seems to work on the really slow Olimex SAM7EX256 board (display speed limitation) @8kHz
* If your oscilloscope display stops then it is likely that your driver has stalled due to running
* out of free buffers. Increase the number of buffers..
*/
gfxBufferAlloc(8, 256);
/* Get the screen dimensions */
swidth = gdispGetWidth();
sheight = gdispGetHeight();
/* Set up the scope window to fill the screen */
{
GWindowInit wi;
gwinClearInit(&wi);
wi.show = gTrue;
wi.x = wi.y = 0;
wi.width = swidth; wi.height = sheight;
ghScope = gwinScopeCreate(&gScopeWindow, &wi, MY_AUDIO_CHANNEL, MY_AUDIO_FREQUENCY, MY_AUDIO_FORMAT);
}
gwinSetBgColor(ghScope, GFX_WHITE);
gwinSetColor(ghScope, GFX_RED);
gwinClear(ghScope);
/* Just keep displaying the scope traces */
while (1) {
gwinScopeWaitForTrace(ghScope);
}
}
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