HydraFW 1 wire guide - hydrabus/hydrafw GitHub Wiki
HydraFW Bus 1-wire
This guide is updated towards firmware release HydraFW v0.11 and later
Bus: 1-wire
Connections: One pin and ground
Output types: open drain/open collector
Pull-up resistors: required for open drain output mode (2K – 10K).
Pull-up/down resistors Integrated in MCU: Between 30 to 50K (Typical 40K).
Maximum voltage: 5.5volts (5volt safe)
Protocol configuration syntax description:
-
show
Show 1-wire parameters orshow pins
Show pins used in this mode -
pull
with parameterup
ordown
orfloating
to choose internal MCU pull up/down or no pull/external -
msb-first
orlsb-first
to send/receive respectively MSB first or LSB first. -
scan
Discovers one or multiple devices on the 1-wire bus and displays their addresses. -
exit
to exit 1-wire mode
Note default value:
> 1-wire
Device: onewire1
GPIO resistor: floating
Bit order: LSB first
Configuration options:
Hardware Informations:
onewire1> show pins
PIN: PB11
Protocol configuration example:
Configuration of onewire1 wit internal pullup :
> 1-wire
Device: onewire1
GPIO resistor: floating
Bit order: LSB first
onewire1> pull up
onewire1> show
Device: onewire1
GPIO resistor: pull-up
Bit order: LSB first
onewire1>
Protocol interaction syntax description:
trigger
configures the trigger mode
Protocol interaction example usage onewire1 write/read:
onewire1> scan
Discovered devices : 28 FF 10 2E A6 15 01 3B
onewire1> [ 0x33 hd:8
WRITE: 0x33
28 FF 10 2E A6 15 01 3B | (......;
Additional informations about 1-wire
For more information about the 1-wire protocol, see : https://www.maximintegrated.com/en/app-notes/index.mvp/id/1796