ANT Forum

Dear Members,
Can I use this for Garmin GSC-10 background scanning ?
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ant_examples_scanning.html
It's running on my terminal, but how can I see the value from Garmin GSC-10 ?

How can I run this function ?
/**@brief Process ANT message on ANT background scanning channel.
*
* @param[in] p_ant_evt ANT message content.
* @param[in] p_context Context.
*/
void background_scanner_process(ant_evt_t * p_ant_evt, void * p_context)
{
uint32_t err_code;
UNUSED_PARAMETER(p_context);
if (p_ant_evt->channel != ANT_BS_CHANNEL_NUMBER)
{
return;
}

switch (p_ant_evt->event)
{
case EVENT_RX:
{
err_code = bsp_indication_set(BSP_INDICATE_RCV_OK);
APP_ERROR_CHECK(err_code);

if (p_ant_evt->message.ANT_MESSAGE_stExtMesgBF.bANTDeviceID)
{
m_last_device_id = uint16_decode(p_ant_evt->message.ANT_MESSAGE_aucExtData);
}

if (p_ant_evt->message.ANT_MESSAGE_stExtMesgBF.bANTRssi)
{
m_last_rssi = p_ant_evt->message.ANT_MESSAGE_aucExtData[5];
}

NRF_LOG_INFO("Message number %d", m_recieved);
NRF_LOG_INFO("Device ID: %d", m_last_device_id);
NRF_LOG_INFO("RSSI: %d", m_last_rssi);

m_recieved++;
break;
}
default:
{
break;
}
}
}

Thanks      

haighi - 30 November 2020 10:46 AM

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ant_examples_scanning.html shows that they have configured the RF channel to 2477 MHz and the network key to the public key. You would need to change these to the ANT+ network and channel.

If you want to receive only from the GSC-10 you will need to configure the device type to match the S&C profile. You can also wildcard (0) to receive data from all ANT+ sensors, and then parse the device type from the extended data. See the "ANT Message Protocol and Usage" document for more details on the extended data format.

.................You would need to change these to the ANT+ network and channel.
How can I change it ? which file ?
What's the ANT+ configuration for Garmin GSC10 ?

Thanks      

haighi - 30 November 2020 10:46 AM

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ant_examples_scanning.html shows that they have configured the RF channel to 2477 MHz and the network key to the public key. You would need to change these to the ANT+ network and channel.

If you want to receive only from the GSC-10 you will need to configure the device type to match the S&C profile. You can also wildcard (0) to receive data from all ANT+ sensors, and then parse the device type from the extended data. See the "ANT Message Protocol and Usage" document for more details on the extended data format.

These lines ?

const ant_channel_config_t ms_channel_config =
{
.channel_number = ANT_MS_CHANNEL_NUMBER,
.channel_type = CHANNEL_TYPE_MASTER,
.ext_assign = 0x00,
.rf_freq = RF_FREQ,
.transmission_type = CHAN_ID_TRANS_TYPE,
.device_type = CHAN_ID_DEV_TYPE,
.device_number = dev_num,
.channel_period = CHAN_PERIOD,
.network_number = ANT_NETWORK_NUM,
};

const ant_channel_config_t bs_channel_config =
{
.channel_number = ANT_BS_CHANNEL_NUMBER,
.channel_type = CHANNEL_TYPE_SLAVE,
.ext_assign = EXT_PARAM_ALWAYS_SEARCH,
.rf_freq = RF_FREQ,
.transmission_type = CHAN_ID_TRANS_TYPE,
.device_type = CHAN_ID_DEV_TYPE,
.device_number = 0x00, // Wild card
.channel_period = 0x00, // This is not taken into account.
.network_number = ANT_NETWORK_NUM,

What is the parameter for Garmin GSC10 ?

Thanks      

Hi Ian,
I have a little problem regarding "background scanning" example.

- Master = Nordic DK with ANT+ Tx profiles (e.g. HRM)
- Slave = Nordic DK with background scanning example

Parameters:
- RF = 57
- Trans type = 0 or 120 (e.g. HRM)
- Device type and channel as in datasheet

Results:
- when ANT_PLUS_NETWORK_KEY (master and slave) = 0, 0, 0, 0, 0, 0, 0, 0 it works
- when ANT_PLUS_NETWORK_KEY (master and slave) = 0xB9, ... it does NOT work
- With ANT_PLUS_NETWORK_KEY (master and slave) = 0xB9... my Garmin watch can detect Nordic DK simulator, when it is 0,... it can not (logical)

My question is what am I doing wrong, so when I am using correct ANT_PLUS_NETWORK_KEY, background scanning does not work (but it does with a public key)?
Thank you      

Sorry for the key and yes I did mean Device type as 120.

I did assume that only ANT+ device would use that key, but like I did mention when changing that key, it effects if it works or not.

When on "0" it can detect any simulation ANT+ on Nordic Dk (HRM, BSC;...) with key = 0, but when changed to 0xB9,... it stops working.
As well When Background scanning is set to "0" and ANT+ simulators are set to 0xB9,... it does not work. Same result if I use a real ANT+ sensors.

I will try "continuous scanning" example as well. If there is some other suggestion regarding that issues I will appreciate. Thank you.      

Hi Haigh,

thank you for your support, it works now with sd_ant_network_address_set()      

It's hard to understand. Why doesn't it work for me?

krunker