[91] Flipper Zero - Understand SPI Protocol
In this multi-part video series we learn about SPI. Serial Peripheral Interface, created by Motorola in the 80s, is used to interface the Flipper Zero with devices such as SD cards, temperature sensors and flash memory. This video takes a look at flash memory. We use the "SPI Mem Manager" app, which is used to read/write to flash memory. We learn how to wire up devices to the Flipper Zero. We learn what each wire actually does. We look at the signals on the CS, SCK, MOSI and MISO wires and hand-decode some Flipper Zero interactions. Finally, we write some Flipper Zero code to read a message from the flash memory.
In future videos, we will be looking at how the external CC1101 works and how to control WS2812B LEDs using SPI.
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Lesson summary:
SPI is used it interface with various devices, like flash memory, temp sensors, SD cards, etc.
CS (Chip Select) is used to signal to sensor that communication is for it.
SCK (Serial Clock) is controlled by the Flipper Zero. Each cycle a bit is read & written.
MOSI (Main Out/Sub In) is output from Flipper Zero. Data in on sensor.
MISO (Main In/Sub Out) is input to Flipper Zero. Data out on sensor.
TRX needs more memory
TX, RX commands make code more readable.
Timeline:
0:00 - Introduction
0:27 - SPI 4-wire implementation
0:52 - Chip Select (CS)
1:06 - Serial Clock (SCK)
1:22 - Main Out/Sub In (MOSI)
1:52 - Main In/Sub Out (MISO)
2:13 - Power
2:36 - Decoding Chip Id message
4:08 - SPI Memory Manager
4:25 - Flipper Zero communication
5:30 - Flipper Zero code (TRX)
6:54 - Flipper Zero code (TX, RX)
8:12 - Summary
Video for setting up Windows Development Environment:
• [51] Flipper Zero - Windows developme...
SPI Mem Manager project (not my project):
https://github.com/flipperdevices/fli...
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