MEMC

Interfaces for Memory Controllers (MEMC). More...

Topics
	MEMC Driver Backend API

Files
file	memc.h
	Main header file for Memory Controller (MEMC) driver API.

Functions
int	memc_read (const struct device *dev, uint32_t addr, uint8_t *data, size_t len)
	Read data from external memory.
int	memc_write (const struct device *dev, uint32_t addr, const uint8_t *data, size_t len)
	Write data to external memory.
static void *	memc_get_mem_base (const struct device *dev)
	Get the memory-mapped base address of a MEMC device.
int	memc_get_size (const struct device *dev, uint64_t *size)
	Get the size of external memory.
int	memc_read_id (const struct device *dev, uint8_t *id, size_t len)
	Read the ID of external memory.

Detailed Description

Interfaces for Memory Controllers (MEMC).

Since

4.5

Version

0.1.0

Function Documentation

memc_get_mem_base()

void * memc_get_mem_base ( const struct device * dev )

inlinestatic

#include <zephyr/drivers/memc.h>

Get the memory-mapped base address of a MEMC device.

Note

This function is available in kernel mode only (not a syscall). The returned pointer is a kernel-space address and cannot be used from userspace directly. Use memc_read() / memc_write() for portable access.

Parameters

dev	MEMC device.

Returns

Pointer to the mapped base address, or NULL if not memory-mapped or if the device does not implement the memc API

memc_get_size()

int memc_get_size	(	const struct device *	dev,
		uint64_t *	size )

#include <zephyr/drivers/memc.h>

Get the size of external memory.

Parameters

dev	MEMC device.
size	Pointer to variable to store size in bytes.

Returns

0 on success, negative errno code on failure.

Return values

-ENOTSUP

if the device does not implement the memc API or the optional callback.

memc_read()

int memc_read	(	const struct device *	dev,
		uint32_t	addr,
		uint8_t *	data,
		size_t	len )

#include <zephyr/drivers/memc.h>

Read data from external memory.

Parameters

dev	MEMC device.
addr	Byte offset from the base address to read from.
data	Buffer to store read data.
len	Number of bytes to read.

Returns

0 on success, negative errno code on failure.

Return values

-ENOTSUP

if the device does not implement the memc API, or if neither get_mem_base nor read is implemented.

memc_read_id()

int memc_read_id	(	const struct device *	dev,
		uint8_t *	id,
		size_t	len )

#include <zephyr/drivers/memc.h>

Read the ID of external memory.

Parameters

dev	MEMC device.
id	Buffer to store ID (size depends on device, typically 2-4 bytes).
len	Number of bytes to read. Drivers may return fewer bytes than requested if the device ID is shorter.

Returns

0 on success, negative errno code on failure.

Return values

-ENOTSUP

if the device does not implement the memc API or the optional callback.

memc_write()

int memc_write	(	const struct device *	dev,
		uint32_t	addr,
		const uint8_t *	data,
		size_t	len )

#include <zephyr/drivers/memc.h>

Write data to external memory.

Parameters

dev	MEMC device.
addr	Byte offset from the base address to write to.
data	Buffer containing data to write.
len	Number of bytes to write.

Returns

0 on success, negative errno code on failure.

Return values

-ENOTSUP

if the device does not implement the memc API, or if neither get_mem_base nor write is implemented.