Breakout Wiring

Though it looks like a lot of connections, wiring up an eInk breakout is pretty straightforward! Below shows using hardware SPI to connect it to an Adafruit Metro M4.

Vin connects to the microcontroller board's 5V or 3.3V power supply pin
GND connects to ground
CLK connects to SPI clock. It's easiest to connect it to pin 3 of the ICSP header.
MOSI connects to SPI MOSI. It's easiest to connect it to pin 4 of the ICSP header.
MISO connects to SPI MISO. It's easiest to connect it to pin 1 of the ICSP header.
ECS connects to our e-Ink Chip Select pin. We'll be using Digital 9
D/C connects to our e-Ink data/command select pin. We'll be using Digital 10.
SRCS connects to our SRAM Chip Select pin. We'll be using Digital 6
RST connects to our e-Ink reset pin. We'll be using Digital 8.
BUSY connects to our e-Ink busy pin. We'll be using Digital 7.
SDCS connects to our SD Card Chip Select pin. We'll be using Digital 5