LaptopSupplySpoofer

DS2431 1-Wire EEPROM Driver

This is a 1-Wire protocol driver for the DS2431 chip, a 1024-bit 1-Wire EEPROM commonly used as an ID chip in laptop power supplies. I developed this driver to read and program the DS2431, enabling it to function as a Dell laptop power supply ID chip for my laptop supply spoofer project.

This driver can also be used for other 1-Wire EEPROM DS2xxx series devices as long as they have the same 1-Wire command and memory architecture.

The driver is designed for STM32F446RE MCU. To port it to other STM32 families, you can modify the MCU-specific HAL header file and update the peripheral addresses in the ds2431.h file accordingly.

Make sure your MCU has a basic timer peripheral for microsecond delay functionality the MCU needs to communicate with the EEPROM chip.

How To Use The Driver

OneWire_init(): Configures the GPIO and TIMER for a 1-Wire communication. Call this function first before calling other 1-Wire commands.

---

OneWire_ReadROM(): Reads and displays data from DS2431 EEPROM memory.

• @param: uint16_t startaddress, start address of EEPROM read.
• @param: size_t bytesToRead, number of bytes to read from start address.
• @param: uint8_t *pdataBuffer, pointer to data buffer where read data will be stored.

---

OneWire_WriteMemory: Writes data into DS2431 EEPROM memory.

• @param: uint16_t startaddress, start address of EEPROM write.
• @param: uint8_t *pdata, pointer to data source buffer.

EEPROM WRITING GUIDELINES

1. Write in 8-byte chunks: You can only write full 8-byte rows at a time.
2. Use 8-byte aligned addresses: Writes must start at addresses divisible by 8 (e.g., 0x00, 0x08, 0x10…).

---

OneWire_WriteByte: Writes a byte of data into the 1-Wire bus

• @param: uint8_t byte, the byte to write to the bus.

---

OneWire_Reset(): MCU sends a reset pulse to ds2431

---

OneWire_ReadByte: Reads a byte of data from 1-Wire bus.