Problems with the UART decoder

Forum for discussing PicoScope version 6 (non-automotive version)
bennog
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Joined: Mon Nov 26, 2012 9:16 am
Location: Netherlands

Re: Problems with the UART decoder

Post by bennog »

Now the key question which of the timing is off, the scope or de Arduino.

I guess the Arduino.

Can you make a .psdata file of something with a exactly known frequency at the highest sampling rate possible with your scope.

Be sure you set the number of samples to the max (100MS) as in image below
2020-09-29_08-56-19.png
Benno

poxyran
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Joined: Wed Sep 09, 2020 2:17 pm

Re: Problems with the UART decoder

Post by poxyran »

Hello Martyn, Benno,

I repeated the test with an Arduino Uno compatible board (Osoyoo Uno) and I got the same results (same issue with the baud rate as Martyn described). I have some other boards to repeat the test but I guess I'll get the same results, we'll see.

Regarding Benno request: "Can you make a .psdata file of something with a exactly known frequency at the highest sampling rate possible with your scope.". What do you suggest? I'm not very experienced, I have only a few more boards (some arduinos, teensy and stm32 boards).

bennog
Advanced User
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Posts: 70
Joined: Mon Nov 26, 2012 9:16 am
Location: Netherlands

Re: Problems with the UART decoder

Post by bennog »

Can you repeat the test with a teensy board.

I f this gives the same result I suspect the internal scope oscillator is about 2.2% off.

According your .psdata the measured baudrate of the signal is 117.7 kbps

Benno

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