Ltran0325 / MSP432-SPI-EEPROM

Write and Read a byte to SPI EEPROM (25LC040)

MSP432-SPI-EEPROM

SPI Basics:

Also known as four-wire serial interface. The Serial Peripheral Interface BUS (SPI) has four wires: SCLK, MOSI, MISO, and SS.

1. SCLK - serial clock line
2. MOSI - master-out-slave-in data line
3. MISO - master-in-slave-out data line
4. SS - slave select line

SPI uses two shift registers to transmit and receive data.

SPI EEPROM Operation:

Read and write a byte to SPI EEPROM (25LC040)

https://github.com/Ltran0325/MSP432-SPI-EEPROM/blob/main/main.c

25LC040 Datasheet:

http://ww1.microchip.com/downloads/en/devicedoc/21204e.pdf

READ:

Source: 25LC040 datasheet

To read a byte from 25LC040:

1. Pull CS low
2. Send READ instruction byte
3. Send lower address byte
4. Send dummy byte to read data output (recieve and trasmit concurrently)
5. Pull CS high

WRITE:

Source: 25LC040 datasheet

To write a byte to 25LC040:

1. Pull CS low
2. Send WRITE instruction byte
3. Send lower address byte
4. Send byte to be written
5. Pull CS high

Circuit Setup:

Source: 25LC040 datasheet