ESP8266 Community Forum

- Sat Aug 13, 2016 11:05 am #52848 Thank you for the information, however, what I can't get to work is the MCP23S17.
Do you have an updated library for this part?
-Regards

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- Sat Aug 13, 2016 11:13 am #52850 What are the specifics what does it allow?

How many I/O?

What are the things these I/O pins support:
On?
Off?
pwm?
interrupts?
status register?

Communications buses it is SPI but anything else:
Is it also I2C based?

Thanks

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- Sat Aug 13, 2016 11:22 am #52852 Forlotto-
It is SPI-based. I2C is a bit slow and is half-duplex while the SPI is much faster and full-duplex.
I have used them in SPI mode while coding in another language and they work quite well and are fast.
I am new to the ESP8266 chip (2 weeks) and trying to get it straight in my head is why I was asking the poster of the lib how it work because it is not working for me.

The code as far as I can see does not allow for interrupt from the chip although I have used it before and it is just a matter of initializing the 23S17 for that mode and how you want it to set the pin.

Once I get it to work I will share the hows and whys and I think it will happen as I have asked for help from 2 sources.

If we knew what we were doing, it wouldn't be called research.
- Albert Einstein

- Sat Aug 13, 2016 2:09 pm #52861 I think this could be the right library(at attachment)..
There are 2 more i've found;

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