CC2640R2F: CC2640R2F 支持一从多主模式吗？

Julia Ju

Intellectual 360 points

Part Number: CC2640R2F

如题，CC2640R2F是否支持一从多主模式？如果可以，设计时有哪些注意点？有没有这方面的资料？

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735695 points

As I know, it doesn't support this mode.

0 Evan W over 7 years ago in reply to YiKai Chen

TI__Mastermind 40600 points

Hi,

Can you please translate into English?

0 YiKai Chen over 7 years ago in reply to Evan W

Guru 735695 points

Evan W He is asking if CC2640R2F BLE perpherial can connect to multiple BLE central.

0 Evan W over 7 years ago in reply to YiKai Chen

TI__Mastermind 40600 points

Peripherals can be connected to multiple masters at once. Make sure that MAX_NUM_BLE_CONN is set to > 1 on the peripheral, and a quick test can be run.

0 YiKai Chen over 7 years ago in reply to Evan W

Guru 735695 points

Evan W Do you mean simple_peripheral example can connect to two BLE central at the same time if we set MAX_NUM_BLE_CONN as 2?

0 Evan W over 7 years ago in reply to YiKai Chen

TI__Mastermind 40600 points

Yes, I believe so, i think it was adopted in BLE 4.1 or 4.2. The test would be to increase MAX_NUM_BLE_CONN and see. I would need to try myself as well, but with the holidays, won't be able to until after the new year.

0 YiKai Chen over 7 years ago in reply to Evan W

Guru 735695 points

Evan W I change MAX_NUM_BLE_CONNS from 1 to 3 in simple_peripheral example and test it. However, simple_peripheral doesn't advertise after SimpleLink Starter of my iphone connect to it. So, anthoer SimpleLink Starter APP on anther smartphone cannot scan it any more. I move to test this with muti-role example and it works fine. I suppose simple_peripheral example need some extra revisitions to make it keep adverting after it connects to a BLE central.

0 Evan W over 7 years ago in reply to YiKai Chen

TI__Mastermind 40600 points

This could be a limitation of the BLE3 example app. I'll need to do some digging when I'm back in the office after the holidays, but as far as the limitations in the spec, I don't think there is anything that limits a slave being connected to more than one master as of spec 4.1 or 4.2.

0 YiKai Chen over 7 years ago in reply to Evan W

Guru 735695 points

Evan W I agree with your points and look forward to seeing your feedback about how to make this work on simple peripheral example.

0 ke fan over 7 years ago in reply to Evan W

Expert 1890 points

a solution for project zero to have mulitple active connections to masters that works : https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/538348

0 YiKai Chen over 6 years ago in reply to Evan W

Guru 735695 points

Evan W Have you digged into this and know why simple_peripheral doesn't advertise with MAX_NUM_BLE_CONNS=3 after simple_peripheral connects to SimpleLink Starter App?

0 Evan W over 6 years ago in reply to YiKai Chen

TI__Mastermind 40600 points

Hi YK,

It seems that the software in simple_peripheral in the BLE4.2 stacks is just not setup to handle more than one connection. There is nothing in the spec that prevents it, but for instance, there is only a single index for handling connection info, but when you compare that to the BLE5 Simple Peripheral, you have a structure that has all the connection info and an array of them is made during initialization for each possible connection.

// Per-handle connection info
static spConnRec_t connList[MAX_NUM_BLE_CONNS];

Therefore, there is nothing in the BLE Stack v3.x.x that prevents someone from using multiple connections to a central with a peripheral other than the software. The application software could be re-written to support such, but i have a feeling we did not do this out of the gate for two reasons.

1) The more connections you support, the more RAM you have to statically allocate for each connection

2) Most of the BLE Stack v3.x.x software architecture was taken from BLE Stack v1/v2.x to make it familiar to customers and this was just missed.

0 YiKai Chen over 6 years ago in reply to Evan W

Guru 735695 points

Evan W Get it and Thanks for elaboration.

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CC2640R2F: CC2640R2F 支持一从多主模式吗？