5a05ee99a1
- 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
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.