Glitch when using nrfx_comp_init()

[Jared]

The NRFX COMP driver that is included in SDK 17.02 enables the COMP peripheral before configuring the other COMP registers. The product specification specifies: 

Before enabling the comparator via the ENABLE register, the following registers must be configured for the single-ended mode:

• PSEL
• MODE
• REFSEL
• EXTREFSEL
• TH

It has been observed that this has caused a glitch on the pin that is adjacent to the one assigned for the COMP peripheral. 

[Jared]

Moving nrf_comp_enable(NRF_COMP) to after nrf_comp_input_select(NRF_COMP, p_config->input) in nrfx_comp_init fixes the issue.