The TWI Scanner Example allows to scan the TWI bus in order to look for connected TWI devices. You can use it to find the address of a single device or to count the devices connected to the nRF board.

The application read sample data on all of possible TWI addresses and waits for a response. Based on the response, the application decides if there is a TWI device connected to the nRF board with a given address.

You can find the source code and the project file of the example in the following folder: <InstallFolder>\examples\peripheral\twi_scanner

Testing

Test the TWI Scanner Example application by performing the following steps:

1. Compile and program the application.
2. Start a terminal emulator like PuTTY and connect to the used COM port with the following UART settings:
   • Baud rate: 115.200
   • 8 data bits
   • 1 stop bit
   • No parity
   • HW flow control: None
3. Observe the logs from the application.

It is recommended to set the flag clear_bus_init during initialization, to make sure that the device is not stuck due to a break during a previous transmission, and that it will send a response.