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Unibrain Fire-i 501/511/601/701/702/810 Operation Manual Page 63
4.13. PIO Control Register
Short for Programmed Input/Output, PIO provides a set of IO ports which can be configured by the defined address.
The PIO control register by 1394 address, for strobe and trigger signal, is as follows.
Address Description (bit 0: msb) Read/Write
0xF2F21000
PIO output register
Bit 30 : Strobe GPIO output
Write only
0xF2F21004
PIO input register
Bit 31 : trigger GPIO input
Read only
0xF2F21008
PIO GPIO enable register.
Bit 30 : Strobe pin GPIO selector (1: GPIO, 0: strobe)
Read/Write