291 TWI Monitor
291 : TWI Monitor
- Author: Nicklaus Thompson
- Description: A Two Wire Interface (I2C) bus monitor
- GitHub repository
- Open in 3D viewer
- Clock: 50000000 Hz
How it works
This project is a Two-Wire Interface (I2C) monitor. The TWI side is essentially a shift register and does not respond like a slave or have an address. The system runs at 50 MHz and uses a UART baud rate of 115200. The system cannot currently capture repeated TWI frames, but captured single frames during testing on an FPGA.
How to test
You can use an Arduino and any TWI-compatible module to generate TWI frames to view. The frames will be converted to three bytes, those being {addr, R/W}, {data}, and {{4{Addr Ack}}, {4{Data Ack}}}. I use Coolterm to view the hex output, you can download it at https://freeware.the-meiers.org/.
External hardware
This project needs an external UART to USB adapter if you want to connect it to your PC.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | SDA_in | TX_out | |
| 1 | SCL_in | ||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |