ra8_eth_gptp_cfg_t Struct Reference

Static configuration for ra8_eth_gptp_init. More...

#include <ra8_eth_gptp.h>

Data Fields
uint32_t	clk_hz
	ESWCLK frequency in Hz feeding the GPTP counter.

Detailed Description

Static configuration for ra8_eth_gptp_init.

The GPTP counter advances by PTPTIVCt.TIV on every clk edge, and clk for the GPTP block is ESWCLK, the ESWM operating clock (HUM 9.10.23 "EtherSW Clock (ESWCLK)" p 405). Pass the live frequency – callers get it from ra8_cgc_eswclk_hz() – and ra8_eth_gptp_init derives TIV from it, so the counter is right on any clock tree rather than only on the one the driver was written against.

Invariant

clk_hz must be high enough that TIV fits in 32 bits, i.e. strictly greater than 31.25 MHz.

Example:

uint32_t hz = 0U;
(void)ra8_cgc_eswclk_hz(&hz);
const ra8_eth_gptp_cfg_t cfg = {.clk_hz = hz};

See also

ra8_eth_gptp_init

Definition at line 124 of file ra8_eth_gptp.h.

Field Documentation

clk_hz

uint32_t ra8_eth_gptp_cfg_t::clk_hz

ESWCLK frequency in Hz feeding the GPTP counter.

Definition at line 125 of file ra8_eth_gptp.h.

Referenced by ra8_eth_gptp_init().

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The documentation for this struct was generated from the following file:

• libs/ra8_hal/inc/ra8_eth_gptp.h