Changes to SPI ?

[Bastiaan]

Hello, I re-did my circuit board. and it worked before together with a featherwing 3.5, but I am getting Zero readings from my 4 thermocouples. Max31855 type K,

SPI1
I used two seperate SPI lines on the teensy4.1 pin 27 for the CLK1and MISO1 on 39
all 4 max31855 Are connected together on this bus. Chip select is on 36,37,38,39.

SPI0
The other SPI which I use for a featherwing 3.5“ is on the standard Pins pin 13CLK, MOSI11,MISO12, DC=10, CS=9;

For both SPI lines I have two seperate constructors and with different settings. As similar done from the SPI page for the teensy.

How can I set a different SPI channel for the thermocouples?

In the void setup I declare all the CS pins as HIGH.
I get an error on SPI1.begin(); which is located in the void setup. Do I also have to set the beginTransaction in the void setup? And in the void loop? and close it to? Or do I have todo it differently? Because I am getting Zero readings from my thermocouples.

Just want to know what the write way is in Syntax for a Setting up a SPI connection

Did any changes occur on the SPI library?

Many thanks

Bastiaan

 

[PAAUX4]

beginTransaction is only for when you are actually transferring data so you do not need that in the setup. I had a problem using MISO1 and pin 39 and it was because I did not call SPI1.setMISO(39); Maybe try that if you have not already?

 

[KurtE]

Note: I am pretty sure, this is now logically a duplicate of the thread: https://forum.pjrc.com/threads/6660...eensy4-1-SPI-configuration?highlight=max31855

Recently as part of the other thread, I put in a Pull Request to Adafruit to allow you to specify which SPI buss to use with that library.