Advanced Usage; Dedicated Gpio Pins - Sferalabs Iono Pi Max v2 3+ Lite User Manual

Advanced usage

Dedicated GPIO pins

Iono Pi Max uses several of the Raspberry Pi Compute Module GPIO pins. These pins
should not be used for other functions.
GPIO pin
GPIO2/SDA1
GPIO3/SCL1
GPIO14/TXD
GPIO15/RXD
GPIO32
GPIO39
GPIO17
GPIO18
GPIO40
GPIO38
GPIO37
GPIO33
GPIO30
GPIO0
GPIO31
GPIO1
GPIO6
GPIO28
GPIO41
GPIO42
GPIO43
GPIO44
GPIO45
GPIO16
GPIO19
GPIO20
GPIO21
GPIO29
42
Direction
out
in
out
out
in
out
out
in
out
in
out
in
out
in
in
in
out
in
in/out
out
out
in
in
in
in
in/out
Description
I 2 C SDA line
I 2 C SCL line
serial TX line (RS-232 or RS-485)
serial RX line (RS-232 or RS-485)
cycle high/low for watchdog heartbeat
set to high to enable the watchdog
high on watchdog timeout
set to high to enable the shutdown cycle
set to high to turn on the buzzer
high when P1 button pressed
soft serial TX for MCU configuration console
soft serial RX for MCU configuration console
set to low to enable USB1 (bottom) power
low on USB1 fault
set to low to enable USB2 (top) power
low on USB2 fault
SDA/SDB matrix switch status
CAN controller interrupt
MCU SWD interface enable
MCU SWD interface SWO
MCU SWD interface SWDIO
MCU SWD interface SWCLK
MCU reset (active low)
DI1
DI2
DI3
DI4
DT1
Iono Pi Max User Guide