ESB radio maximum channel number?

Question

The manuals for the nRF51 and nRF52 list the maximum ESB radio channel number
as 100, but in the SDK the guard value in the set channel function is <= 125 
 (in both the older SDK's using micro_esb.c, and the latest SDK 12.0.0 using nrf_esb.c). 
 Whch value is correct? 
 See:
SDK 12.0.0 using nrf_esb.c, line 1242
micro_esb.c, line 573
nRF51 Series Reference Manual (page 93)
nRF52832 - Product Specification v1.0 (page 216)

Einar Thorsrud · Accepted Answer

This is a bug, and you should not use a channel number higher than 100. Thanks for reporting it. The channel number is inserted directly into the FREQUENCY field of the FREQUENCY register in the RADIO, and this is limited to 100 on both the nRF52 and nRF51. 
 (As you may have seen, you can in fact set a value up to 125, but it is out of spec, and should not be used).

ESB radio maximum channel number?

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