How to arrange Ble and Ant+ event ?

RE: How to arrange Ble and Ant+ event ?

Kenneth — Mon, 20 Apr 2020 14:14:28 GMT

It is normal to get EVENT_RX_FAIL sometimes, for instance a <2-3%, how many % do you get EVENT_RX_FAIL?

I assume you are using external 32kHz crystal in your design?

RE: How to arrange Ble and Ant+ event ?

hongpal — Mon, 20 Apr 2020 12:57:16 GMT

However, I can get EVENT_RX_FAIL event without connect ble.

RE: How to arrange Ble and Ant+ event ?

Kenneth — Mon, 20 Apr 2020 12:49:03 GMT

From time to time there may be collisions on air and packet loss due to interference. So that you may receive sporadic EVENT_RX_FAIL is something you should expect. In this case I notice you have a BLE interval of 500ms and an ANT channel of ~250ms. This will mean that you from time to time can get an EVENT_RX_FAIL (they drift over eachother). If you in addition open an ANT channel search you need to have the priority to low/ background search to minimize the effect on the already open ANT channel. If you still experience issues I don't think there is much you can do. You can try to configure BLE slave latency (>0) of the peripheral, this will allow to trade some lower throughput of BLE for ANT, you may also look into if you can use a different interval for BLE (e.g. ~490ms instead of 500ms).

Best regards,
Kenneth

RE: How to arrange Ble and Ant+ event ?

hongpal — Mon, 20 Apr 2020 12:36:36 GMT

It depends on Ant+ sensor type.

So I use one of 8086, 8102, 8118, 8070,8182, 8192, 8198.

RE: How to arrange Ble and Ant+ event ?

Kenneth — Mon, 20 Apr 2020 12:22:56 GMT

Search for sd_ant_channel_period_set().

Best regards,
Kenneth

RE: How to arrange Ble and Ant+ event ?

hongpal — Mon, 20 Apr 2020 11:32:47 GMT

I dont know ant interval.

How to check that? If you say ant waevform, It is default.

When is comes to ble, the min and max are 400 latency is 0

RE: How to arrange Ble and Ant+ event ?

Kenneth — Mon, 20 Apr 2020 11:14:45 GMT

What are the connection parameters/interval of the BLE and ANT channels?

Best regards,
Kenneth

RE: How to arrange Ble and Ant+ event ?

hongpal — Mon, 20 Apr 2020 10:57:03 GMT

Of course, I always set low priority search.

However, I can have this problem.

RE: How to arrange Ble and Ant+ event ?

Kenneth — Mon, 20 Apr 2020 10:07:41 GMT

This should be related to my first reply (since you need to change the priority of ANT search while there is an ANT channel open):
https://www.thisisant.com/resources/an11-ant-channel-search-and-background-scanning-channel

RE: How to arrange Ble and Ant+ event ?

hongpal — Mon, 20 Apr 2020 07:06:41 GMT

The result is very good.

However, I don't have another problem.

I connect one of Ant+ sensors and get datas from that, it is very work.

However, if I open another channel to connect another sensors, I can get EVENT_RX_FAIL and EVENT_RX_FAIL_GO_TO_SEARCH. So I can sometimes lost connections from the sensors.

How to solve this problem?

RE: How to arrange Ble and Ant+ event ?

Kenneth — Wed, 15 Apr 2020 11:04:29 GMT

[quote user="KimTaeHan"]is it correct to call functions before opening channel ?[/quote]

Yes, before you open channel.

Best regards,
Kenneth

RE: How to arrange Ble and Ant+ event ?

hongpal — Wed, 15 Apr 2020 10:24:45 GMT

Thank you, I will try to do that.

However, I don't know the time when I call sd_ant_coex_config_get(), sd_ant_coex_config_set().

is it correct to call functions before opening channel ?

RE: How to arrange Ble and Ant+ event ?

Kenneth — Wed, 15 Apr 2020 09:54:20 GMT

Then I believe the problem is the same as discussed here:
https://www.thisisant.com/forum/viewthread/7332/

You will need to use sd_ant_coex_config_get() and sd_ant_coex_config_set()

Something like this:

ANT_BUFFER_PTR readCfg;
uint8_t buffer[10];
readCfg.ucBufferSize = 10;
readCfg.pucBuffer = &buffer[0];

error = sd_ant_coex_config_get(channel, &readCfg, NULL);
readCfg.pucBuffer[0] &= ~0x08; // disable fixed search hp interval priority config
error = sd_ant_coex_config_set(channel, &readCfg, NULL);

RE: How to arrange Ble and Ant+ event ?

hongpal — Tue, 14 Apr 2020 17:51:29 GMT

I am doing your solution.

Howerver, I still can see delayed datas.

RE: How to arrange Ble and Ant+ event ?

Kenneth — Tue, 14 Apr 2020 16:09:04 GMT

Hi,

I suspect you need to disable high priority search, see here for more information:
https://www.thisisant.com/resources/an11-ant-channel-search-and-background-scanning-channel

Add ant_search_config.c from the nRF5 SDK, then it is configured by calling ant_search_init():
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/group__ant__search__config.html

For instance you need to set the following before calling ant_search_init(&search_config):

// Disable high priority search to minimize disruption to other channels while searching
search_config.high_priority_timeout = ANT_HIGH_PRIORITY_SEARCH_DISABLE;

Calling ant_search_init(&search_config) must be done before calling sd_ant_channel_open().

There should be ANT examples in the nRF5 SDK that show how you can use ant_search_init().

Best regards,
Kenneth