SPI Clock initialization api

RE: SPI Clock initialization api

Amanda Hsieh — Wed, 15 May 2019 10:51:42 GMT

Hi,

[quote user="Aadishri GS"] I wanted to know if for SPI, clock is automatically provided based on the frequency provided in PSEL.CLK[/quote]

The clock in PSEL.CLK is generated by the nRF52840 when using the SPI master peripheral. The number configured in FREQUENCY register will decide what frequency will be output on CLK pin.

[quote user="Aadishri GS"][/quote]

This is what the documentation says: "Automatic internal oscillator and clock control, and distribution for ultra-low power" under Section 5.4: CLOCK — Clock control

Please clarify

There are two clock controllers, HFCLK controller and LFCLK controller, in the clock control. LFCLK controller supports 32.768 kHz RC oscillator (LFRC) which has ultra-low power (ULP) mode.

-Amanda

RE: SPI Clock initialization api

Aadishri GS — Wed, 15 May 2019 05:31:41 GMT

Yes, but I wanted to know if for SPI, clock is automatically provided based on the frequency provided in PSEL.CLK

This is what the documentation says: "Automatic internal oscillator and clock control, and distribution for ultra-low power" under Section 5.4: CLOCK — Clock control

Please clarify

RE: SPI Clock initialization api

Amanda Hsieh — Tue, 14 May 2019 13:03:33 GMT

Hi,

nRF5 SDK v15.3.0: Clock describes how the clock driver performs initialization and calibration in the SDK.

Best regards,

Amanda