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makiyoung
Berichten: 1
Lid geworden op: 30 Jun 2017, 08:59

NodeMCU SPI Module too fast

30 Jun 2017, 09:02

I really want to make use of the SPI module on my NodeMCU. SPI keeps my code clean and frees up some of my GPIO pins. I feel it is sending data too fast for my 74HC595(the datesheet of 74hc595) to keep up with. It was working for a bit, then stopped.

It seemed like there was a lot of noise on the line so I hooked up the logic analyzer and saw that when I was sending data, bits were flying across the line at almost 6 ns (which is awesome). I am driving a 595 and ultimately a stepper, that need data at a way slower rate. I have tried using the clock parameter in the setup call, I feel it never slows the SPI clock.

Is there any way to set the clock speed to something that would be more 595+stepper friendly?

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