Multiple SPIM sections using EasyDMA

[SteveHx]

My design is in alpha test and we just discovered that apparently SPIM allows only one module to be enabled at a time. When a second module (SPIM3, SPIM2) is enabled, the first turns off or the 2nd never turns on, depending on the relative priority of the two. Surely this can't be a restriction of the part, or there would be no reason to have multiple modules. Reducing the clock rates does not help. How can I run two (or more) SPIM modules simultaneously?

[SteveHx]

I thought of that also. But why does it work fine with only one channel operating?

Still, it's worth a try. I'll have a go at that. I have plenty of unused pins where I can dump SCLK.

[SteveHx]

Well, son-of-a-self-sealing-cylinder!! That appears to work! Quite strange that the channels will work without it if only one is enabled and not with two enabled, but I've got the proof. Now, to get back to some of the other issues with my code.

Thank you very much for being so responsive. Sometimes it just takes somebody else to point out the "obvious". One of the drawbacks of being a one-man-shop!

[hmolesworth]

Glad to be of help; also a one-man-shop :-)

This may possibly be of help if wanting many SPIMs: spi-sharing-common-lines

[Turbo J]

Won't help here, OP is abusing MOSI as some kind of PWM signal generator and thus needs constant clocking of the peripherial(s).

I recommend the PWM peripherials for most signal generating use cases.