CC2541 sleep mode

Sreedev K

Other Parts Discussed in Thread: CC2541

Hello,

I have a question about putting a CC2541 to sleep. I haven't attempted anything yet. I'm planning to not to use osal power manager. Instead I'll be modifying the registers directly to put the device to sleep and wake up when an IO interrupt is triggered. But I'm assuming that I have to wake up periodically to let various BLE tasks to be processed. Am I right? So whats the best way of doing this. I've heard of the sleep timer. I guess I have to wake up periodically in such a way that I won't miss the BLE events.

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735695 points

I think the best way is to enable POWER_SAVING and let osal to handle it for you. Do you have any special reason that you don't want to use osal power manager?

0 Sreedev K over 10 years ago in reply to YiKai Chen

Intellectual 475 points

I got all sorts of connection and pairing issues when I turned on power savings. So I thought it would be better to do it myself at the register level.

0 YiKai Chen over 10 years ago in reply to Sreedev K

Guru 735695 points

Really? I don't think enable POWER_SAVING would causes connection and pairing issue. Can you elaborate?

0 Sreedev K over 10 years ago in reply to YiKai Chen

Intellectual 475 points

When I turned on power saving, the device broadcasts, but in the end pairing or service discovery fails. Which sleep mode does POWER_SAVINGS implement. My board doesn't have an external 32.768KHz crystal. That might be the reason things are going wrong.

0 YiKai Chen over 10 years ago in reply to Sreedev K

Guru 735695 points

I don't see any similar issue with TI EVB/EVM so I would say external 32.768KHz crystal might be the root cause. If that's the root cause, it won't help to do sleeping by yourself instead of using POWER_SAVING in BLE stack. You should add it to your board and test again.

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CC2541 sleep mode