How to arrange Ble and Ant+ event ?

[hongpal]

Hello, Nordic

I'm developing with nrf52840, s340, sdk 16.0.0, gcc-arm-none-eabi-7-2018-q2 in my customboard.

Currently, I'm using master of Ble and Ant.

It is possible to get datas from Ble sensor once a second if I don't try to search Ant sensor.

However, if I open channel to search Ant sensor and then it is not possible to get datas from Ble sensor once a second.

I just receive 2 ~ 3 seconds delayed datas that send from ble sensor. 

Please, let me know how to solve this problem. 

[Kenneth]

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

[hongpal]

I am doing your solution.

Howerver, I still can see delayed datas.

[Kenneth]

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);

[hongpal]

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 ?

[Kenneth]

hongpal said:

is it correct to call functions before opening channel ?

Yes, before you open channel.

Best regards,
Kenneth

[hongpal]

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?

[Kenneth]

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 

[hongpal]

Of course, I always set low priority search.

However, I can have this problem.