Maxim 31856 Thermocouple IC Driver
- Initializes a MAX31856 with Type-K Thermocouple Settings.
- Starts a FreeRTOS task to monitor Thermocouple Temperature and Faults.
Notes on Register Reads and Writes
The private functions which read and write the registers of the chip are a bit of a hack, they send each byte in a seperate transaction and manually control the SPI CS line.
From what I can tell the MAX31856 expects dummy bytes or "dead air" in between each byte sent and I wasn't able to replicate this with the ESP-IDF spi-master driver but I am probably doing something wrong.
Pull requests are welcome...
After two days with a Logic Analyzer hooked up, the only difference I could see was this delay or clock pulse between each byte on a working implementation.
Notes on Fault Register Reads
After I finished the library, I had to go back and add a read_fast_register() function because the Fault register works like it should in a single transaction and was returning bad data with the hack.
I am going to assume this is some weird hardware issue with this chip until further notice or someone else submits a patch.