How SPI Protocol works | SPI Protocol Operation |SPI in Embedded | Serial Peripheral Interface
The Serial Peripheral Interface (SPI) is a synchronous, full-duplex, 4-wire serial communication protocol used for short-distance, high-speed data transfer between a master (e.g., microcontroller) and peripheral slave devices (sensors, displays, flash memory). It operates using Clock (SCLK), Master Out Slave In (MOSI), Master In Slave Out (MISO), and Chip Select (CS/SS) lines.
Key Characteristics and Components:
Master-Slave Architecture: One master controls one or more slaves.
High Speed: Faster than I2C, suitable for applications requiring rapid data throughput.
Synchronous: Data transfer is synchronized by a clock signal (SCLK) generated by the master.
Full-Duplex: Data can be sent and received simultaneously.
Lines:
SCLK (Serial Clock): Synchronizes data transmission.
MOSI (Master Out Slave In): Data line for sending data from master to slave.
MISO (Master In Slave Out): Data line for sending data from slave to master.
CS/SS (Chip Select/Slave Select): Active-low signal used to select a specific slave device
How It Works:
To initiate communication, the master pulls the CS/SS line low for a specific slave. The master generates the clock signal, and data is shifted out on the MOSI line and in on the MISO line at the same time.
Clock Polarity (CPOL) and Phase (CPHA):
SPI allows the master to configure clock polarity (idle state of the clock) and clock phase (rising or falling edge to sample data), resulting in four different SPI modes
What You’ll Learn in This Video:
What is SPI Protocol and why it’s important
Key components: Master, Slave, MOSI, MISO, SCLK, and SS
How SPI communication works (bit-by-bit explanation)
Data transfer timing and clock polarity/phase (CPOL & CPHA)
Applications of SPI in real-world embedded devices
Advantages and limitations of SPI compared to other protocols
Chapters:-
00:00 Introduction to SPI Protocol
01:33 SPI Features
05:44 SPI Clock -SCK.
07:12 MOSI
07:48 MISO
08:08 Slave Selection -SS/CS
11:20 SPI Daisy Chain
14:50 CPOL- Clock polarity
16:01 CPHA- Clock Phase
17:31 Advantages of SPI Protocol
19:33 Disadvantages of SPI Protocol
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