Setup:
Teensy 3.2
Teensyduino 1.8.12 on Mac OS 10.15.5
USB Type: "Serial"
CPU Speed: 72 MHz (though I've tried many others)
Direct USB cable, no hubs or anything, no other devices plugged in
I just installed the current Teensyduino after being away for probably a year. I am having all sorts of really basic serial problems, data is just dropping left and right. Here's an example of a complete program I am running right now:
On the Serial Monitor, I would expect that I'd see numbers increasing and rolling over at 255. Here's what I see right now after approximately 10 seconds or so of running:
I just ran it on a Teensy 3.6 (180 MHz) and saw the same thing (not identical numbers dropped, but the same phenomenon of dropping most data). Also tried it on an Arduino Pro Mini and it runs exactly as you'd expect, no missed characters.
Any ideas? Things to look at that might be weird about my system? It's a fresh install and I rebooted recently. The Serial Plotter shows a sawtooth graph that is similarly imperfect. Thanks for any ideas you might have!
[Update: Also tried it on a Teensy 4.0, with the same results, most data dropped.]
[Update 2: I swapped USB cables and all of a sudden it seemed like it was working perfectly for a moment so I thought it was solved. Now I can't replicate that even with the new cable. Argh.]
Teensy 3.2
Teensyduino 1.8.12 on Mac OS 10.15.5
USB Type: "Serial"
CPU Speed: 72 MHz (though I've tried many others)
Direct USB cable, no hubs or anything, no other devices plugged in
I just installed the current Teensyduino after being away for probably a year. I am having all sorts of really basic serial problems, data is just dropping left and right. Here's an example of a complete program I am running right now:
Code:
byte count = 0;
void setup() {
Serial.begin(9600);
Serial.println("startup!");
delay(1000);
}
void loop() {
Serial.println(count++);
delay(100);
}On the Serial Monitor, I would expect that I'd see numbers increasing and rolling over at 255. Here's what I see right now after approximately 10 seconds or so of running:
Code:
128
130
131
137
147
149
153
155
164
167
171
173
179
181
185
187
196
200
206
209
210
214
217
222
224
227
229
237
242
245I just ran it on a Teensy 3.6 (180 MHz) and saw the same thing (not identical numbers dropped, but the same phenomenon of dropping most data). Also tried it on an Arduino Pro Mini and it runs exactly as you'd expect, no missed characters.
Any ideas? Things to look at that might be weird about my system? It's a fresh install and I rebooted recently. The Serial Plotter shows a sawtooth graph that is similarly imperfect. Thanks for any ideas you might have!
[Update: Also tried it on a Teensy 4.0, with the same results, most data dropped.]
[Update 2: I swapped USB cables and all of a sudden it seemed like it was working perfectly for a moment so I thought it was solved. Now I can't replicate that even with the new cable. Argh.]
Last edited:
