I have a Argon and I’m trying to communicate with a chip that I have working on a Arduino Uno which is using Bitbanging.
@peekay123 helped me convert the library to use the Hardware SPI interface on the Argon.
One thing I noticed when troubleshooting is that the SCLK line starts off at 3.3-3.2v but once communication starts it drops down to 1.6v. Is this normal for this pin to operate at this voltage?
The MISO, MOSI and SS/CS pin all operate at 3.3-3.2V. It’s just the SCLK line that’s operating low.
When I pull the SCLK line from the shield I’m connecting to the SCLK pin stays at 1.6v.
Any ideas? I’m going to try on a Photon also to see if there are any differences.
In the screenshot below you see the SCLK line starts off at 3.255v but then operates at 1.6v in the next screenshot.
MISO, MOSI, SS/CS pins all operate at 3.3v?
Update: I just tested another project using a Argon with a device over SPI and the voltage on the CLK line is also 1.62V. So seems to be normal on the Argon.
I’m off to see if I see the same issue on the Photon.