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Pi User 5a05ee99a1 Add ESP32-C3 SPI slave with ESP-NOW, Raspberry Pi test tools, and updated project structure

- ESP32-C3 SPI slave project with ESP-NOW broadcast functionality
- Raspberry Pi SPI master test tools and CLI for JSON communication
- Merged src/ directory from full branch with lighting controller code
- Updated Pipfile with system install scripts and ESP32 monitoring
- Added comprehensive test suite for SPI communication

2025-10-01 21:08:28 +13:00

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ESP32-C3 SPI Slave with ESP-NOW Project

This ESP-IDF project implements an SPI slave device that broadcasts received data via ESP-NOW with the following GPIO configuration:

MOSI: GPIO10
MISO: GPIO9
SCLK: GPIO20
CS: GPIO7

Features

SPI Mode 0 (CPOL=0, CPHA=0)
256-byte buffer for data exchange
DMA support for efficient transfers
Real-time data logging via UART
ESP-NOW broadcasting of received SPI data
Timestamped data packets
Broadcast to all nearby ESP32 devices

Building and Flashing

Set up ESP-IDF environment:
```
. $HOME/esp/esp-idf/export.sh
```
Build the project:
```
cd esp32
idf.py build
```
Flash to ESP32-C3:
```
idf.py -p /dev/ttyUSB0 flash monitor
```

Usage

The ESP32-C3 will act as an SPI slave device, waiting for transactions from an SPI master. When data is received, it will:

Print the received data to the serial console
Broadcast the received data via ESP-NOW to all nearby ESP32-C3 devices
Send back a test pattern (0x00, 0x01, 0x02, ...)
Wait for the next transaction

ESP-NOW Data Format

The broadcasted data includes:

Data: The actual SPI received data (up to 256 bytes)
Length: Number of bytes received
Timestamp: Millisecond timestamp when data was received

Receiving ESP-NOW Data

To receive the broadcasted data on another ESP32-C3 device, you can use the ESP-NOW receive callback function. The data structure is:

typedef struct {
    uint8_t data[256];    // Received SPI data
    uint8_t length;       // Number of bytes
    uint32_t timestamp;   // Timestamp in milliseconds
} espnow_data_t;

Serial Monitor

Connect to the serial monitor to see debug output:

idf.py -p /dev/ttyUSB0 monitor

The device will log received SPI data and transaction status.

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