At25040Handler Class Reference

Thread-safe AT25040B EEPROM façade (BaseSpi + optional /WP GPIO). More...

#include <At25040Handler.h>

Public Types
enum class	ProbeResult : uint8_t { NotBound = 0 , Absent = 1 , Present = 2 }
	Result of a non-destructive presence probe. More...

Public Member Functions
	At25040Handler (BaseSpi &spi, BaseGpio *wp=nullptr) noexcept
ProbeResult	Probe () noexcept
	SPI probe; does not parse product identity.
uint8_t	LastRdsr () const noexcept
bool	Read (uint16_t addr, uint8_t *dst, uint16_t len) noexcept
	Read len bytes starting at addr.
bool	Write (uint16_t addr, const uint8_t *src, uint16_t len) noexcept
	Page-loop write. Caller owns identity / calibration policy.
void	ReleaseWriteProtect () noexcept
	Drive /WP inactive so page writes can proceed.
void	ParkWriteProtect () noexcept
	Drive /WP active (protect) after a write burst.

Private Attributes
At25040SpiAdapter	adapter_
at25040::Device< At25040SpiAdapter >	device_
BaseGpio *	wp_ {nullptr}
RtosMutex	mutex_ {}

Detailed Description

Thread-safe AT25040B EEPROM façade (BaseSpi + optional /WP GPIO).

Member Enumeration Documentation

ProbeResult

enum class At25040Handler::ProbeResult : uint8_t

strong

Result of a non-destructive presence probe.

Enumerator
NotBound	SPI not attached / constructor-only state.
Absent	Bus answered with no device.
Present	RDSR / identity bytes look like AT25040.

Constructor & Destructor Documentation

At25040Handler()

At25040Handler::At25040Handler ( BaseSpi &  spi, BaseGpio *  wp = nullptr  )

inlineexplicitnoexcept

Parameters

spi	Host SPI (CS already bound on the BaseSpi instance).
wp	Optional write-protect GPIO; nullptr if /WP is hard-wired.

Member Function Documentation

LastRdsr()

uint8_t At25040Handler::LastRdsr ( ) const

inlinenoexcept

Returns

Last RDSR byte captured by the driver.

ParkWriteProtect()

void At25040Handler::ParkWriteProtect ( )

noexcept

Drive /WP active (protect) after a write burst.

Probe()

At25040Handler::ProbeResult At25040Handler::Probe ( )

noexcept

SPI probe; does not parse product identity.

Read()

bool At25040Handler::Read ( uint16_t  addr, uint8_t *  dst, uint16_t  len  )

noexcept

Read len bytes starting at addr.

Parameters

addr	EEPROM address.
dst	Destination buffer (must hold len bytes).
len	Byte count.

Returns

true on a complete read.

ReleaseWriteProtect()

void At25040Handler::ReleaseWriteProtect ( )

noexcept

Drive /WP inactive so page writes can proceed.

Write()

bool At25040Handler::Write ( uint16_t  addr, const uint8_t *  src, uint16_t  len  )

noexcept

Page-loop write. Caller owns identity / calibration policy.

Parameters

addr	EEPROM address.
src	Source buffer.
len	Byte count.

Returns

true when every page was written and its write cycle ended (the driver waits up to 10 ms per page); /WP is parked again on every path.

Member Data Documentation

adapter_

At25040SpiAdapter At25040Handler::adapter_

private

device_

at25040::Device<At25040SpiAdapter> At25040Handler::device_

private

mutex_

RtosMutex At25040Handler::mutex_ {}

mutableprivate

wp_

BaseGpio* At25040Handler::wp_ {nullptr}

private

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The documentation for this class was generated from the following files:

• At25040Handler.h
• At25040Handler.cpp