Newer
Older
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
<!DOCTYPE html>
<html>
<head>
<title>Debugging</title>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="style.css"/>
<style>
@import url(https://fonts.googleapis.com/css?family=Share+Tech+Mono&display=swap);
@import url(https://fonts.googleapis.com/css?family=Roboto);
body {
font-family: 'Roboto';
font-size: large;
}
h1, h2, h3 {
font-family: 'Share Tech Mono', monospace;
margin-bottom: 0;
}
.small * {
font-size: small !important;
}
code {
font-family: monospace;
border-radius: 5px;
}
.inverse {
background: #272822;
color: #777872;
text-shadow: 0 0 20px #333;
}
.inverse h1, .inverse h2 {
color: #f3f3f3;
line-height: 0.8em;
}
.chapter {
background: #000000;
color: #f3f3f3;
text-shadow: 0 0 20px #333;
}
.chapter h1, .inverse h2 {
color: #f3f3f3;
line-height: 0.8em;
}
.footnote {
position: absolute;
font-family: Roboto;
font-size: small;
bottom: 3em;
right: 3em;
}
/* styling only necessary for displaying source */
#source {
position: absolute;
display: none;
font-family: monospace;
font-size: medium;
background: #333333;
color: white;
padding: 10px;
text-align: left;
width: 65%;
height: 70%;
z-index: 1000;
}
#overlay {
position: absolute;
display: none;
background: black;
width: 100%;
height: 100%;
opacity: 0.2;
z-index: 999;
}
</style>
</head>
<body>
<textarea id="source">
class: center, middle, inverse
# Debugging
]
???
Press 'p' to enter presentation mode. Or even better:
1. press 'c' to clone the page
2. press 'p' to enter presentation mode
3. used cloned view for beam, share screen in zoom.
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a>Fab Academy 2023 - recitation on debugging </span></div>
.image_right[
]
1-Attitude
2-General principles
3-Multimeter
4-Logical analyzers
5-Oscilloscope
6-How to debug almost anything kit
7-Flashing your board
8- Microcontroller debugging
9-Serial (or any) "Hello world!"
10-USB and computer detection
11 -Radio Communications
---
class: center, middle, chapter
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a>Fab Academy 2023 - recitation on debugging</span></div>
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
# Attitude & General principles
.footnote[
Slides by Fran & Duaa
]
---
class: middle, center
## ERROR
.image_center[
]
---
<p>
.image_right[
<img src="img/jump.jpg" height="500px">
]
## Don't jump to conclusions
<p>
- Approach the problem objectively
- Everyone (everything) is a suspect!
---
<p>
.image_right[
<img src="img/colombo1.jpg" height="600px">
]
## Write
<p>
- what is happening
- what is the environment
- what are you doing
- what are the results
---
## Read
<img src="img/rtfm.jpg" height="450px">
Don't forget to undrestand what you just read!
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
Fab Academy 2023 - recitation on debugging </span></div>
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
## Narrowing down the problem
<P>
.image_right[
<img src="img/visual.jpg" height="400px">
]
<p>
- Reproduce the problem
- Always first do visual check
- traces
- solder
- components
- Keep in mind that the problem might not be visible without a microscope
Everything looks good but...
.footnote[
Image by Jonathan Blok - Waag
]
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
Fab Academy 2023 - recitation on debugging </span></div>
<img src="img/p2.png" width="870">
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
Fab Academy 2023 - recitation on debugging </span></div>
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
## It's not working
Concentrate only on the relevant parts. Isolate the problem.
---
## The microcontroller is not receiving voltage / the wrong voltage
Big chance the problem is located here.
---
## Can't program the microcontroller
Big chance the problem is located here.
---
## Programmed, unable to program other microcontrollers
Big chance the problem is located here.
---
class: center, middle, chapter
# Multimeter
- "Continuous" phenomenons
- Continuity check (+diodes orientation) : symbol
- Voltage/Power check : parallel measurement
- Resistance / current / ...
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Continuity
- Test power supply to power pins continuity
- Check fuses, diodes orientations, ...
- Check short-circuits
- Check traces
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Voltage
- Parallel measurement => check your cables!
- ! absolute maximum ratings (may burn your component)
- Power supply impedence / max power, badly selected
- GND/VCC loop
<img src="img/V_DC.jpg" width="350"><img src="img/parallel.png" width="350">
---
## Power supply
- Nothing : open circuit, short circuit, line break, blown fuse, ...
- Voltage too low : power supply impedence, badly selected, ...
- Voltage too high : above max. ratings, dead zener/reg., ...
- GND/VCC loop
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## How to check current, resistor, capacitor, ...
- Learn more about you mulimeter capabilites!
- Current : serie
- Resistor : parallel
- capacitor : parallel (+ polarity)
<img src="img/multimeter-symbols.jpg" height="300">
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## MultiMeter
<video id="sampleMovie" src="./img/multimeter.mp4" width="800" height="500" controls=""></video>
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Voltage Drop
<video id="sampleMovie" src="./img/voltage_drop.mp4" width="800" height="500" controls=""></video>
---
class: center, middle, chapter
# Logical analyzer
- Variable **digital** signals
- Communications [UART, I²C, SPI, 1-Wire, ...]
- PWM
- Clock
- ...
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Logical analyzers
- High sampling rates (> 100MHz - 500 MHz)
- Only "logical levels" (0 : <0.6V - 1 : > 1.2V => usually not CMOS logic!)
- Multiple channels (8-16...)
- "Unexpensive" (compared to oscilloscopes)
- Allows you to read complex protocols easily
[Saleae](https://www.saleae.com/), [Pulseview](https://sigrok.org/wiki/PulseView) with Cypress CY7C68013A, ...
<img src="https://sigrok.org/wimg/e/ee/PulseView_I2C_DS1307_Decode.png" width="700">
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
# Logic Analayzer
<video id="sampleMovie" src="./img/logicanalyzer.mp4" width="800" height="500" controls=""></video>
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
# Logic Analayzer
- ["logic analyzer 8 channel"](https://www.amazon.com/KeeYees-Analyzer-Device-Channel-Arduino/dp/B07K6HXDH1)
- ["logic analyzer 16 channel"](https://nl.aliexpress.com/item/4000386048107.html)
- ["Digikey 461-1010-ND: MICRO-HOOK RED 0.025" SQ PINS "](https://www.digikey.com/en/products/detail/e-z-hook/XKMRED/528231)
- ["Digikey 461-1010-ND: MICRO-HOOK BLACK 0.025" SQ PINS "](https://www.digikey.com/en/products/detail/e-z-hook/XKMBLK/528230?s)
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
# LA104 + DS213
<p>
.image_right[
<img src="./img/24.jpg" height="400px">
]
- [LA104](http://www.miniware.com.cn/product/signal-analyzer/)
- [DS213](http://www.miniware.com.cn/product/ds213-mini-oscilloscope/)
---
class: center, middle, chapter
# Oscilloscope
- "Variable / random" phenomena
- Variable signals (analog, communications, blink, sound, ...)
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Oscilloscope (main functions)
- "Real" voltage levels, high sampling rate (> 10MHz - 1GHz)
- Dynamic view
- Triggers/Time/Level
- Lots of analysis capabilities inside (play with menus : capture/ analyse / freq-time / intervals / Peak-peak / frequency / ...)
- Few channels (~1-4)
- Expensive tool. Poor human alternative : sound card mic/line input [< 44.1kS/sec]
<img src="img/oscilloscope.jpg" width="500">
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
<img src="img/thies_no_conditionning.png" width="350"><img src="img/thies_conditionning.png" width="350">
"Random" behaviours :
- Check proper signals
- Check proper power (stable enough?)
- DC decoupling capacitor? (same idea as toilet flush ;-) )
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
<center> <iframe width="672" height="378" src="https://www.youtube.com/embed/waXIuDSv9uY" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen ></iframe> </center>
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
<center> <iframe width="672" height="378" src="https://www.youtube.com/embed/HJwMpVrwPUQ" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> </center>
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
<center> <iframe width="672" height="378" src="https://www.youtube.com/embed/6btUw8nLmuU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> </center>
---
class: middle
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
<center> <iframe width="672" height="378" src="https://www.youtube.com/embed/DHvR1r6aXpw" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> </center>
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by-nc/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Pinecile
<img src="https://images.ctfassets.net/2lpsze4g694w/7z8QIZm61leOIQQANsxu33/d826cb16b2e08da0b41f070a3bfe9768/main_on.jpg" width="800">
- [Pinecil](https://pine64.com/product/pinecil-smart-mini-portable-soldering-iron/)
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by-nc/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## DPS3005 Bench Power Supply
<p>
<center>
<img src="img/dps3005.jpg" width="600">
</center>
</p>
- [DPS3005/5005](https://nl.aliexpress.com/item/4001237790968.html)
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by-nc/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## DPS3005 Bench Power Supply
<p>
<center>
<img src="img/DPS5005_pyGUI.png" width="800">
</center>
</p>
- [PyGUI](https://github.com/lambcutlet/DPS5005_pyGUI)
---
class: center, middle, chapter
# Flashing your board
And what can go wrong
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## EDBG for flashing ARM (1)
- Connect a CMSIS-DAP SWD adapter
- 10-pin 1.27mm connectors are convenient, but triple check the orientation
- If VCC pin is unused, power your target device separately
- Make sure the programmer is on 3.3V if programming SAMD
<center>
<img src="img/programmer_jtag.jpg" width="700">
</center>
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
## EDBG for flashing ARM (2)
- List programmers
```c
edbg -b -l
```
- Erase first (!) and load program
```c
edbg -ebpv -t <processor> -f <program.bin>
```
- flags:
- -b: verbose (optional)
- -e: erase
- -p: program
- -v: verify (optional)
- -t: target type (e.g. samd11)
- Common problems
- Programmer not listed: check USB
- Invalid response: check JTAG connection
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## UPDI for Flashing AVR (1)
- All you need is a serial adapter
- RX and TX connected together with a 4.7k resistor
- VCC is optional but ensures both chips talk at the same logic level
- Programming is initiated with a break (LOW level for a long duration)
<center>
<img src="img/programmer_updi.png" width="500">
</center>
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
## UPDI for Flashing AVR (2)
- pymcuprog.py
```c
pymcuprog -d <processor> -t uart -u <port> -v info erase
pymcuprog -d <processor> -t uart -u <port> -v info write -f <program.hex>
```
- Arduino IDE
- install megaTinyCore (ATtiny 1-series) or DxCore (AVR DA/DB)
- use "serial port and 4.7k (pyupdi style) SLOW" programmer
- select correct serial port and click upload
- Common problems
- wrong serial settings: adapter needs 2 Stop bits and Even parity
- "incorrect echo": are RX and TX connected together?
- "UPDI initialisation failed": have you tried turning it off and on again?
---
class: center, middle, chapter
# In-circuit / On-Chip debugging
Advanced debugging
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Atmel ICE
<center>
<img src="img/atmel_ice.jpg" width="500">
</center>
- [Atmel-ICE](https://www.microchip.com/DevelopmentTools/ProductDetails/ATATMEL-ICE)
- Allows you to pause execution (breakpoints / run-to-cursor)
- Watch variables and registers
- Tightly integrated within **Atmel Studio**
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
## OpenOCD+GDB for debugging SAMD
- Open source alternative to Atmel Studio debugging
- Install on windows: https://gnutoolchains.com/arm-eabi/openocd/
- Install on linux:
```bash
apt get install openocd
```
- Create `openocd.cfg`:
```c
source [find interface/cmsis-dap.cfg]
set CHIPNAME at91samd11c14
source [find target/at91samdXX.cfg]
```
- Connect SWD programmer and launch: `openocd`
- Connect to opencd with gdb:
```bash
arm-none-eabi-gdb -iex "target extended-remote localhost:3333"
```
---
class: center, middle, chapter
# Serial (or any) "Hello world!"
Sending internal info through communication line
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
## Serial (or any) "Hello world!"
- Show any external signal on code execution (eg : LED blinking)
- Send register value or "hello world" message through communication lines (eg : serial/UART)
- Very simple to implement but requires functional microcontroller
- Allows you to follow execution steps
Example:
```c
#define DEBUG_MODE 1
...
#if DEBUG_MODE
Serial.print("DEBUG -- MyVal value = ");
Serial.println(MyVal, DEC);
#endif
```
---
class: center, middle, chapter
# USB
Check your USB device can be found by the OS
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
Fab Academy 2020 - recitation on debugging </span></div>
## USB
.small[
```terminal
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 001 Device 004: ID 413c:2011 Dell Computer Corp. Multimedia Pro Keyboard
```
]
.small[
```terminal
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 001 Device 004: ID 413c:2011 Dell Computer Corp. Multimedia Pro Keyboard
<span style="color:#FF5555;">Bus 001 Device 029: ID 6666:6666 Prototype product Vendor ID </span>
```
]
If nothing :
- Check you load **proper bootloader**!
- Check lines, voltages ("5V" power BUT 3.3V communication D-/D+), zener orientations, ...
If declared but doesn't work :
- Check USB devices permissions
- Check firmware (inject a tried-and-tested)
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
## USB
.small[
```terminal
$ dmesg -w
```
]
.center[
<video width="720" height="480" controls>
<source src="./img/dmesg.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
]
---
class: center, middle, chapter
# Radio Communications
How to see what you can't even touch?
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Radio communications
- Frequency ranges (~kHz to ~GHz)
- Use receiver modules
- DVB-T receiver as radio tool : [GNU Radio (live), SDR environment](https://wiki.gnuradio.org/index.php/GNU_Radio_Live_SDR_Environment)
<img src="img/dvb-t.jpg" width="100">
<img src="img/rtl_sdr.jpg" width="300">
<img src="img/scope_fft.jpg" width="300">
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
## Radio communications
.center[
<video width="720" height="480" controls>
<source src="./img/sdr.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
]
---
<div class="my-footer"><span>
<a rel="license" href="http://creativecommons.org/licenses/by-nc/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc/4.0/80x15.png" /></a></a>
FabAcademy 2023 - recitation on debugging </span></div>
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
## Happy Debugging
<p>
<center>
<img src="img/happy_debugging.jpg" width="800">
</center>
</p>
</textarea>
<script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>
<script type="text/javascript">
var hljs = remark.highlighter.engine;
</script>
<script src="terminal.language.js" type="text/javascript"></script>
<script type="text/javascript">
var slideshow = remark.create({
highlightStyle: 'monokai'
});
// extract the embedded styling from ansi spans
var highlighted = document.querySelectorAll("code.terminal span.hljs-ansi");
Array.prototype.forEach.call(highlighted, function(next) {
next.insertAdjacentHTML("beforebegin", next.textContent);
next.parentNode.removeChild(next);
});
</script>
</body>
</html>