6 years, 10 months ago.

Problems with SSI to read absolute encoder

Hi all,

I am very new to mbed and cpp in general so apologies for the beginner questions - I've done my best to find out answers online before asking!

I have a NUCLEO - F746ZG which I am using to measure the position of a Maxon 16 EASY Absolute encoder with the SSI interface.

I understand how the SSI system works and consequently have my Data, Vcc, GND & CLK pins connected to the nucleo board. Unfortunately I do not have access to an oscilloscope at the moment so the best I can do is output data to teraterm.

My full code can be found here;

[Repository '/users/SGLaws/code/1fyp-encodertest/' not found]

From teraterm I am not getting any interesting data - the data outputted is either 8191 (0b1111111111111), or 4095 (0b1000000000000).

At this point I am entirely bamboozled as to why I am not getting any data.

Note that I realise that the outputted data will be gray code so will not make a lot of logical sense in decimal form at the moment - once I get meaningful data I will worry about converting the data to binary.

Thank you very much in advance for any assistance!

Stephen