How can I give the radio priority over everything else for doing easyDMA?

RE: How can I give the radio priority over everything else for doing easyDMA?

run_ar — Tue, 13 Nov 2018 14:05:11 GMT

Ram (which is used by easyDMA) and flash is on different AHB slaves. The only thing you must consider is that the cpu will need some time between (or after a set of) packets to read the content from the radio buffers. For other HW peripherals you should check the AHB multilayer priorities and make sure they use a different AHB slave than the radio (if they run concurrently that is).

RE: How can I give the radio priority over everything else for doing easyDMA?

David Fogelsong — Tue, 06 Nov 2018 15:11:45 GMT

Here's the situation. The programming code is in flash memory and is executing from there (fairly standard). However, I am concerned that maybe accessing the flash memory in that way is causing a problem with the radio attempting to do easyDMA (I'm using Nordic's proprietary radio mode). Is this a valid concern? If so, how do I avoid the problem "by using different AHB slaves"?

RE: How can I give the radio priority over everything else for doing easyDMA?

run_ar — Tue, 06 Nov 2018 11:59:39 GMT

Hi,

As far as I can see from our documentation the priority of the AHB bus masters is static. However your application can avoid conflicts by using different AHB slaves for different tasks.

RE: How can I give the radio priority over everything else for doing easyDMA?

David Fogelsong — Tue, 06 Nov 2018 08:27:24 GMT

I would like the CPU to remain productive (perhaps processing a packet already received) while it waits for the next packet to be received. That is why I would rather not simply sleep the CPU.