riscvrx_timer.c File Reference

Timer control module source for Lattice RISC-V RX. More...

#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include "no_os_alloc.h"
#include "no_os_error.h"
#include "riscvrx_timer.h"
#include "hal.h"
#include "parameters.h"

Include dependency graph for riscvrx_timer.c:

Functions
int32_t	lattice_timer_set_callback (struct no_os_timer_desc *desc, void(*handler)(void *), void *ctx)
	Register timer callback and context.
int32_t	lattice_timer_start (struct no_os_timer_desc *desc)
	Start timer counting.
int32_t	lattice_timer_stop (struct no_os_timer_desc *desc)
	Stop timer counting.
int32_t	lattice_timer_counter_get (struct no_os_timer_desc *desc, uint32_t *counter)
	Read current timer counter.
int32_t	lattice_timer_counter_set (struct no_os_timer_desc *desc, uint32_t new_val)
	Set timer counter reload value.
int32_t	lattice_timer_count_clk_get (struct no_os_timer_desc *desc, uint32_t *freq_hz)
	Get timer input clock frequency.
int32_t	lattice_timer_count_clk_set (struct no_os_timer_desc *desc, uint32_t freq_hz)
	Set timer input clock frequency.
int32_t	lattice_timer_get_elapsed_time_nsec (struct no_os_timer_desc *desc, uint64_t *elapsed_time)
	Get elapsed time in nanoseconds from MTIME.
int32_t	lattice_timer_init (struct no_os_timer_desc **desc, const struct no_os_timer_init_param *param)
	Initialize Lattice timer descriptor.
int32_t	lattice_timer_remove (struct no_os_timer_desc *desc)
	Remove timer instance and free resources.

Variables
const struct no_os_timer_platform_ops	latt_timer_ops
	Lattice platform specific timer platform ops structure.

Detailed Description

Timer control module source for Lattice RISC-V RX.

Author

Vilmos-Csaba Jozsa (vilmo.nosp@m.scsa.nosp@m.ba.jo.nosp@m.zsa@.nosp@m.analo.nosp@m.g.co.nosp@m.m)

Copyright 2025-2026(c) Analog Devices, Inc.

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Function Documentation

lattice_timer_count_clk_get()

int32_t lattice_timer_count_clk_get	(	struct no_os_timer_desc *	desc,
		uint32_t *	freq_hz )

Get timer input clock frequency.

Parameters

desc	- no-OS timer descriptor.
freq_hz	- Pointer to returned frequency.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_count_clk_set()

int32_t lattice_timer_count_clk_set	(	struct no_os_timer_desc *	desc,
		uint32_t	freq_hz )

Set timer input clock frequency.

Parameters

desc	- no-OS timer descriptor.
freq_hz	- Requested frequency.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_counter_get()

int32_t lattice_timer_counter_get	(	struct no_os_timer_desc *	desc,
		uint32_t *	counter )

Read current timer counter.

Parameters

desc	- no-OS timer descriptor.
counter	- Pointer to returned counter value.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_counter_set()

int32_t lattice_timer_counter_set	(	struct no_os_timer_desc *	desc,
		uint32_t	new_val )

Set timer counter reload value.

Parameters

desc	- no-OS timer descriptor.
new_val	- New tick count value.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_get_elapsed_time_nsec()

int32_t lattice_timer_get_elapsed_time_nsec	(	struct no_os_timer_desc *	desc,
		uint64_t *	elapsed_time )

Get elapsed time in nanoseconds from MTIME.

Parameters

desc	- no-OS timer descriptor.
elapsed_time	- Pointer to returned elapsed nanoseconds.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_init()

int32_t lattice_timer_init	(	struct no_os_timer_desc **	desc,
		const struct no_os_timer_init_param *	param )

Initialize Lattice timer descriptor.

Parameters

desc	- Pointer to no-OS timer descriptor.
param	- no-OS timer init parameters.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_remove()

int32_t lattice_timer_remove

(

struct no_os_timer_desc *

desc

)

Remove timer instance and free resources.

Parameters

desc	- no-OS timer descriptor.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_set_callback()

int32_t lattice_timer_set_callback	(	struct no_os_timer_desc *	desc,
		void(*	handler )(void *),
		void *	ctx )

Register timer callback and context.

Register timer callback and context for Lattice timer backend.

Parameters

desc	- no-OS timer descriptor.
handler	- User callback function.
ctx	- User callback context.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_start()

int32_t lattice_timer_start

(

struct no_os_timer_desc *

desc

)

Start timer counting.

Parameters

desc	- no-OS timer descriptor.

Returns

0 in case of success, negative error code otherwise.

lattice_timer_stop()

int32_t lattice_timer_stop

(

struct no_os_timer_desc *

desc

)

Stop timer counting.

Parameters

desc	- no-OS timer descriptor.

Returns

0 in case of success, negative error code otherwise.

Variable Documentation

latt_timer_ops

const struct no_os_timer_platform_ops latt_timer_ops

Initial value:

= {
    .init = &lattice_timer_init,
    .set_callback = &lattice_timer_set_callback,
    .start = &lattice_timer_start,
    .stop = &lattice_timer_stop,
    .counter_get = &lattice_timer_counter_get,
    .counter_set = &lattice_timer_counter_set,
    .count_clk_get = &lattice_timer_count_clk_get,
    .count_clk_set = &lattice_timer_count_clk_set,
    .get_elapsed_time_nsec = &lattice_timer_get_elapsed_time_nsec,
    .remove = &lattice_timer_remove,
}

Lattice platform specific timer platform ops structure.