Requests can be issued to the Notecard over USB, UART, or I2C. The
Serial UART interface is fixed at a baud rate of 9600, with eight data bits,
no parity bit, and one stop bit (9600/N-8-1).
The Notecard I2C interface is available at address 0x17, but can be
reconfigured using a card.io
request. This interface implements a straightforward serial over I2C protocol.
The simplest way to initiate a connection with the Notecard from firmware is with one of our firmware libraries. Using this approach, you can initialize the Notecard over the appropriate interfacing using a few lines of code. For instance, with Serial:
Or with I2C:
Alternatively, it's possible to manually communicate with the Notecard
over Serial in firmware using language-equivalent print() and read()
functions.
If, on the other hand, you wish to use I2C without one of our firmware
libraries, you'll need to write your own logic for writing to and reading from
the bus. Your approach will vary from one language to the next, but you should
use the existing implementations and the
Serial-over-I2C Protocol Guide
for reference.
