Scheduling Issues Between SPIM and NUS Integration

RE: Scheduling Issues Between SPIM and NUS Integration

Kenneth — Tue, 27 Aug 2024 21:05:58 GMT

Hello,

I suggest to check out some of the devacademy tutorials that indirectly covers this a bit:
https://academy.nordicsemi.com/

I notice you are using nrfx directly to trigger spim transfers at a regular interval, this can work if you are careful with what you do, but the intention is that you should be using the zephyr api, where you simply have a thread that execute the spi transfer at given intervals.

Kenneth

RE: Scheduling Issues Between SPIM and NUS Integration

seongmincho — Tue, 27 Aug 2024 13:08:25 GMT

Thank you for your advice!!
However, it seems that my question was not clearly conveyed. I apologize for the confusion, and I'd like to rephrase my questions:

1. In my situation, is it appropriate to execute nus_send through a separate thread?

2-1. If it is appropriate, how should I schedule the thread for NUS alongside the spim tasks?

2-2. If it is not appropriate, is there an alternative method other than using a thread?

Cho

RE: Scheduling Issues Between SPIM and NUS Integration

Kenneth — Tue, 27 Aug 2024 12:37:57 GMT

Hello,

Do pass data between threads and interrupt you may want to check out message queue:
https://docs.zephyrproject.org/latest/kernel/services/data_passing/message_queues.html

Kenneth

RE: Scheduling Issues Between SPIM and NUS Integration

seongmincho — Tue, 27 Aug 2024 11:26:23 GMT

When running the current code, only spim operates. This suggests that there may be an issue with my scheduling method, as it seems I have implemented it incorrectly.

I used a timer to transmit spim consistently, and the timer's interval is set to be very short(15us~ 60us). To alleviate the load on the spim handler, I attempted to handle nus send using a thread. However, I have determined that this approach may not be appropriate. This is the main issue.

RE: Scheduling Issues Between SPIM and NUS Integration

Kenneth — Tue, 27 Aug 2024 11:07:23 GMT

[quote user=""]Currently, I am attempting the following approach, but it is not yielding the desired results:[/quote]

Can you elaborate a bit what works, and what you encounter does not work?

Kenenth