= Attaching a Max7219 driving an 8 digit 7 segment display via SPI This example code shows how to interface the Raspberry Pi Pico to a Max7219 driving an 8 digit 7 segment display. The particular device used is interfaced via SPI at 3.3v. The Max7219 datasheet can be found here https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf == Wiring information Wiring up the device requires 5 jumpers as follows: * GPIO 17 (pin 22) Chip select -> CS on Max7219 board * GPIO 18 (pin 24) SCK/spi0_sclk -> CLK on Max7219 board * GPIO 19 (pin 25) MOSI/spi0_tx -> DIN on Max7219 board * 5v (pin 40) -> VCC on Max7219 board * GND (pin 38) -> GND on Max7219 board The example here uses SPI port 0. Power is supplied from the 5V pin. [NOTE] ====== There are many different manufacturers who sell boards with the Max7219. Whilst they all appear slightly different, they all have, at least, the same 5 pins required for power and communication. Please ensure you connect up as described in the previous paragraph. ====== == List of Files CMakeLists.txt:: CMake file to incorporate the example in to the examples build tree. max7219_8x7seg_spi.c:: The example code. == Bill of Materials .A list of materials required for the example [[max7219-bom-table]] [cols=3] |=== | *Item* | *Quantity* | Details | Breadboard | 1 | generic part | Raspberry Pi Pico | 1 | https://www.raspberrypi.com/products/raspberry-pi-pico/ | max7219 board with 8x7segment LEDs| 1 | generic part | M/M Jumper wires | 5 | generic part |===