ERCK 05SPI 360

[ShahzebA1i]

ERCK SPI code to be reviewed.

This code attempts to establish SPI communication between an Arduino (as the master) and an SPI-compatible slave device. The program sends start bytes to the slave, retrieves data bytes, and optionally processes the received data (e.g., extracting a 14-bit value for further use).

Features
Configures the Arduino's SPI interface for communication.
Transmits start bytes (0xAA and 0xFF) to initiate communication with the slave.
Receives 4 data bytes from the slave device.
Extracts a 14-bit value from the received bytes for angle measurement.

Connections:
MOSI (Master Out, Slave In): Arduino pin 51.
SCK (Serial Clock): Arduino pin 52.
CS (Chip Select): Arduino pin 53 (defined in the code).

Code Description
Setup Phase - Initializes the SPI interface with:
Clock speed: 125 kHz (to accommodate slower slaves).
Bit order: Most Significant Bit (MSB) first.
SPI Mode: Mode 1 (Clock polarity and phase settings).
Configures the Chip Select (CS) pin to control the slave device.
Loop Phase:
Initiates communication by pulling the CS pin LOW. Sends start bytes (0xAA and 0xFF) to signal the slave to prepare data. Receives 4 data bytes (b1, b2, b3, b4) from the slave. Processes the first two bytes (b1 and b2) to extract a 14-bit value using bitwise operations and masking. Ends the communication by pulling the CS pin HIGH.