nRF52 SDK ANT example "ant_scan_and_forward" example MAX_DEVICES limit?

[Steph van Schalkwyk]

The nRF52 SDK ANT example "ant_scan_and_forward/" configures a device linit of (16-1)=15 in this line:

// Public Definitions
#define MAX_DEVICES ((uint8_t) 16) /**< Maximum number of devices in that can be registered */

Is there a particular reason for this limit? 

I cannot test larger limits as I don't have that many devices.

Thanks,

Steph

[Mttrinh]

Hi,

I think you can safely increase the number of MAX_DEVICES up to 0xFE without any changes to the code, because 0xFF is reserved value - used to indicate that node ID is invalid. If you want to increase the value further you need to make some changes in the code. For instance, node address is held within uint8_t variables and one byte in ANT transmitting buffer is allocated for the address value.

Best Regards,

Martin

[Steph van Schalkwyk]

I changed the nod_id to uint16_t.

Hint: Make sure that MAX_DEVICE is a PRIME NUMBER to minimize hash collisions. Alternatively, use quadratic probing or another method.