Hi All,
I'm planning to build a mechanism that takes samples from a decoder, and
then inject them into a math channel. As far as I can tell, Sigrok
assumes a constant sample rate. This is a problem, as the decoder
doesn't generate a new output for each and every sample. I see two
options to solve this:
1) The decoder pushes copies of the last decoded value into the math
channel at the system sample rate. This means a lot of samples in the
math channel will have the same value, so this wastes RAM.
2) Implement a way to store both the sample, and the time the sample was
taken in the math channel. This adds complexities, as that then requires
a mechanic to fill in the missing samples for displaying or if the math
channel is used as input for another math channel.
What's the best way forward? Keep the constant samplerate in the entire
system, or build a system that can deal with different sample rates per
channel, that are also non-constant? One advantage I see in the latter,
is that such a system can support capturing from multiple input devices,
each with their own, potentially also non-constant sample rate.
I would like this to exist, so I could use Sigrok to debug a system like
this:
The system has a i2c temperature sensor, and a PWM output to a fan. In
software there's a simple temperature controller, so the fan has to ramp
up from 0-100% when the temperature goes from 25-50^C. I would like to
calculate / decode the temperature, the actual PWM going into the fan,
the expected PWM into the fan, and the difference between those PWM
values using these decoders and math channels:
SCL + SDA between microcontroller and the LM75 temperature sensor
|
I2C filter
|
I2c decoder
|
LM75 decoder->temperature ^C
|
Math1 (measured temperature)
PWM output to the fan
|
PWM decoder -> Duty cycles
|
Math2 (measured PWM)
Math1
|
Expression:
If (Math1 > 50) output = 100
If Math1 < 25 output = 0
else output = (math0 - 25) *4
|
Math 3 (expected PWM)
Math 4=(Math3 - Math2) <= difference between expected and measured PWM
Kind regards,
Cedric
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