STW TC1, User Manual

Page: 48 / 374

6 Software
User Manual 48/374
Low Level Hardware Access
The modem interfaces are accessible over the symbolic link files /dev/mux0 and /dev/mux1:
Path Input
information Output
information Description
/dev/mux0 - - This device is created per default.
Send/Receive AT-commands to GSM modem e.g. via
picocom
/dev/mux1 - - This device is created per default.
Send/Receive AT-commands to GSM modem e.g. via
picocom
Path Input
information Output information Description
/proc/device-
tree/stw_gsm@00/device - Name of the modem
e.g. PHS8 This user space interface includes the name
of the modem.
/proc/device-
tree/stw_gsm@00/name - Interface name e.g.
stw_gsm This user space interface includes the name
of the modem interface.
/proc/device-
tree/stw_gsm@00/port - Path to real
interface e.g.
/dev/ttyACM0 This user space interface includes the real
path to the modem serial interface.
/proc/stw_gsm/gsm_power p1 - This user space interface could be used in a
sequence depending on modem type to
switch the GSM modem on/off.
p1:
< 0 >

triggers pin to low level
< 1 >

triggers pin to high level
/proc/stw_gsm/gsm_port - - Symlink for tty-device (/dev/ttyACM0) the
modem is connected to.
Send/Receive AT-Commands depending on
GSM modem type.
WARNING:
If one of these interfaces mux0/1 are used in data mode (GPRS connection is established), no AT
commands can be sent to the modem by using tools like picocom.