Raspberry Pi flash memory SPI programmer

The goal

Write / read flash memory from Raspberry pi through SPI interface.

Usability

Big

Parts

• at45db161d - 16Mbit flash memory
• Raspberry pi rev.2
• wires
• universal board

Hardware

• Raspberry pi gpio adapter

Use Case

• 8 bit sound player 

Description

Raspberry PI has an SPI interface, and we can use it very easily to program our at45db161d 16 M-bit flash (16 / 8 = 2 Megabytes).

There is no special hardware required, only the pins must be connected correctly.

Our flash must be supplied by 3.3V, IO pins, are 3 and 5V compatible. Supply can be taken from Raspberry 3.3V pin and gpio voltage logic in Raspberry is ~3.3V so it will be ok for our device.

Pin connection table:

atd45db161d	Raspberry pi rev.2	pin description
Pin 1   [SI]	Pin 19   [MOSI]	Master Output Slave Input
Pin 2   [SCK]	Pin 23   [SCK]	Serial data clock line
Pin 3   [RESET]	NC	not connected (reset)
Pin 4   [CS]	Pin 24	Chip Select
Pin 8   [SO]	Pin 21   [MISO]	Master Input Slave output
Pin 7   [GND]	Pin 9     [GND]	Ground
Pin 6   [VCC]	Pin 1     [3v3]	3.3V Supply
Pin 5   [WP]	NC	not connected (write protect)

AT45D161D adapter, pinout view.

AT45D161D adapter, chip view.

Connected to Raspberry pi with gpio adapter