SPI cs pin question

RE: SPI cs pin question

cabin — Wed, 15 Feb 2023 07:26:33 GMT

Thank you

I solved it.

Adjusted only one cs pin.

I didn't care about the rest of the sensors because I didn't use them right away.

Have nice day!

RE: SPI cs pin question

Einar Thorsrud — Tue, 14 Feb 2023 12:40:20 GMT

Hi,

As you have two slaves connected to the same bus you need to control the two CS pins yourself. That means configuring them as outputs, and asserting before using a device, waiting some time (the datasheet of the slave should indicate how long), and then start communicating with it, and dessert when done. Also, make sure you never assert both CS pins at the same time.

If you still don't make any progress, then it would be good to see what you are doing, and to know what actually happens on the SPI lines (including two two CS lines).

RE: SPI cs pin question

cabin — Tue, 14 Feb 2023 09:22:01 GMT

Dear Turbo J

The oscilloscope is not in a situation to use right now
So I need to check if the above setting is the right way. (How to control only CS pin separately)
cs pin is output mode.

thank you

RE: SPI cs pin question

Turbo J — Tue, 14 Feb 2023 08:54:14 GMT

Use oscilloscope to qualify "does not work" further. Did you remember to manually set the CS pin(s) to gpio output?