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6
Serial ports, software interface
two serial ports are available one the device :
one shares the the USB data pins of the mini A/B USB connector. Only TX and RX pins are
available, voltage is TTL 3.3V.
one is on the Pogopin interface (pins 3, 5, 6 and 7). TX, RX CTS and RTS are available, voltage is
RS232.
On the software side, the tty devices corresponding to these ports are :
for the RS232 port, /dev/user_external_tty
RS232 interface need to be enable prior to use :
$> echo 1 > /dev/enable_external_tty
After use, it can be disabled with :
$> echo 0 > /dev/enable_external_tty
for the TTL port, /dev/user_tty
In addition, one I2C port is available both on the USB and Procopin connectors.
The I2C interface is accessible through /dev/user_i2c
