1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
* 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 GADC module using it read both a microphone,
* an analogue dial wheel and a temperature sensor.
* The microphone gets read at high frequency to display a very simple oscilloscope.
* The dial and temperature gets read at a low frequency to just print when
* it changes value.
*
* It also demonstrates how to write your own custom GWIN window type.
*/
#include "gfx.h"
/* Include our custom gwin oscilloscope */
#include "gwinosc.h"
/*
* Match these to your hardware
* If you don't have a DIAL device or a TEMP device - just don't define it.
*/
#define MY_MIC_DEVICE GADC_PHYSDEV_MICROPHONE
#define MY_DIAL_DEVICE GADC_PHYSDEV_DIAL
#define MY_TEMP_DEVICE GADC_PHYSDEV_TEMPERATURE
#define MY_DIAL_JITTER 1
#define MY_TEMP_JITTER 3
/* Specify our timing parameters */
#define MY_MIC_FREQUENCY 4000 /* 4khz */
#define MY_LS_DELAY 200 /* 200ms (5 times per second) for the dial and temperature */
/* The desired size for our scope window */
#define SCOPE_CX 64
#define SCOPE_CY 64
/* Data */
static GScopeObject gScopeWindow;
static GConsoleObject gTextWindow;
static GTimer lsTimer;
#ifdef MY_DIAL_DEVICE
static adcsample_t dialvalue;
static adcsample_t lastdial = -(MY_DIAL_JITTER+1);
/**
* We have got a dial reading - handle it
*/
static void GotDialReading(adcsample_t *buffer, void *param) {
(void) buffer;
/* Buffer should always point to "dialvalue" anyway */
/* Remove jitter from the value */
if ((dialvalue > lastdial && dialvalue - lastdial > MY_DIAL_JITTER)
|| (lastdial > dialvalue && lastdial - dialvalue > MY_DIAL_JITTER)) {
/* Write the value */
gwinPrintf((GHandle)param, "DIAL: %u\n", dialvalue);
/* Save for next time */
lastdial = dialvalue;
}
}
#endif
#ifdef MY_TEMP_DEVICE
static adcsample_t tempvalue;
static adcsample_t lasttemp = -(MY_TEMP_JITTER+1);
/**
* We have got a temperature reading - handle it
*/
static void GotTempReading(adcsample_t *buffer, void *param) {
(void) buffer;
/* Buffer should always point to "tempvalue" anyway */
/* Remove jitter from the value */
if ((tempvalue > lasttemp && tempvalue - lasttemp > MY_TEMP_JITTER)
|| (lasttemp > tempvalue && lasttemp - tempvalue > MY_TEMP_JITTER)) {
/* Write the value */
gwinPrintf((GHandle)param, "TEMP: %u\n", tempvalue);
/* Save for next time */
lasttemp = tempvalue;
}
}
#endif
#if defined(MY_DIAL_DEVICE) || defined(MY_TEMP_DEVICE)
/**
* Start a read of the dial and temperature
*/
static void LowSpeedTimer(void *param) {
/* We are not checking for an error here - but who cares, this is just a demo */
#ifdef MY_DIAL_DEVICE
gadcLowSpeedStart(MY_DIAL_DEVICE, &dialvalue, GotDialReading, param);
#endif
#ifdef MY_TEMP_DEVICE
gadcLowSpeedStart(MY_TEMP_DEVICE, &tempvalue, GotTempReading, param);
#endif
}
#endif
/*
* Application entry point.
*/
int main(void) {
GHandle ghScope;
coord_t swidth, sheight;
#if defined(MY_DIAL_DEVICE) || defined(MY_TEMP_DEVICE)
GHandle ghText;
font_t font;
#endif
gfxInit();
/* Get the screen dimensions */
swidth = gdispGetWidth();
sheight = gdispGetHeight();
#if defined(MY_DIAL_DEVICE) || defined(MY_TEMP_DEVICE)
/* Set up the console window we use for dial readings */
font = gdispOpenFont("UI2");
gwinSetDefaultFont(font);
{
GWindowInit wi;
gwinClearInit(&wi);
wi.show = gTrue;
wi.x = wi.y = 0;
wi.width = swidth-SCOPE_CX;
wi.height = sheight;
ghText = gwinConsoleCreate(&gTextWindow, &wi);
}
gwinSetBgColor(ghText, GFX_BLACK);
gwinSetColor(ghText, GFX_YELLOW);
gwinClear(ghText);
/* Start our timer for reading the dial */
gtimerInit(&lsTimer);
gtimerStart(&lsTimer, LowSpeedTimer, ghText, gTrue, MY_LS_DELAY);
#endif
/**
* Allocate buffers for the high speed GADC device - 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.
* 4 x 128 seems to work on the really slow Olimex SAM7EX256 board (display speed limitation)
* If your oscilloscope display stops but the low speed reading keep going then it is likely that
* your high speed timer has stalled due to running out of free buffers. Increase the number
* of buffers..
* If you make the buffers too large with a slow sample rate you may not allow enough time for all
* the low speed items to occur in which case your memory will fill up with low speed requests until
* you run out of memory.
*/
gfxBufferAlloc(4, 128);
/* Set up the scope window in the top right on the screen */
{
GWindowInit wi;
gwinClearInit(&wi);
wi.show = gTrue;
wi.x = swidth-SCOPE_CX;
wi.y = 0;
wi.width = SCOPE_CX;
wi.height = SCOPE_CY;
ghScope = gwinScopeCreate(&gScopeWindow, &wi, MY_MIC_DEVICE, MY_MIC_FREQUENCY);
}
gwinSetBgColor(ghScope, GFX_WHITE);
gwinSetColor(ghScope, GFX_RED);
gwinClear(ghScope);
/* Just keep displaying the scope traces */
while (1) {
/**
* The function below internally performs a wait thus giving the timer thread a
* chance to run.
*/
gwinScopeWaitForTrace(ghScope);
}
}
|
