Dedicated GPIO pins
Strato Pi CM uses some of the Raspberry Pi Compute Module GPIO pins. These pins
should not be used for other functions.
GPIO pin
Direction
Description
GPIO2/SDA
I
2
C SDA line for the real time clock
GPIO3/SCL
I
2
C SCL line for the real time clock
GPIO14/TXD
out
serial TX line
GPIO15/RXD
in
serial RX line
GPIO32
out
cycle high/low for watchdog heartbeat
GPIO39
out
set to high to enable the watchdog
GPIO17
in
high on watchdog timeout
GPIO18
out
set to high to enable the shutdown cycle
GPIO16
out
set to high to turn on LED L1
GPIO38
in
high when P1 button pressed
GPIO37
out
soft serial TX for Strato MCU configuration
GPIO33
in
soft serial RX for Strato MCU configuration
GPIO30
out
set to low to enable USB1 (bottom) power
GPIO0
in
low on USB1 fault
GPIO31
out
set to low to enable USB2 (top) power
GPIO1
in
low on USB2 fault
GPIO6
out
expansion bus enable (reserved for future use)
GPIO34
in/out
expansion bus aux/act line (reserved for future use)
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Strato Pi CM User Guide