HydraFW binary 1 Wire mode guide

HydraFW binary 1-Wire mode guide

This guide is updated towards firmware release HydraFW v0.9 Beta and later

This mode allows to control 1-Wire

• 1-Wire pin: PIN=PB11

For more details see https://github.com/hydrabus/hydrafw/wiki/HydraFW-1-wire-guide

Commands

Once the raw-wire mode has been selected, the following commands are available :

• 0b00000000 Return to main mode. Returns BBIO1
• 0b00000001 Mode identification. Returns 1W01
• 0b00000010 Bus reset
• 0b00000100 Read byte
• 0b0001xxxx Bulk raw-wire transfer
• 0b00100000 SWIO read register
• 0b00110000 SWIO write register
• 0b11xxxxxx Binary Auxiliary pins

Command details

Bus reset (0b00000010)

This command sends a bus reset signal on the 1-Wire bus. No value is sent back.

Read byte (0b00000100)

This command reads a byte on the 1-Wire bus, and sends it back to the user.

Bulk 1-Wire transfer (0b0001xxxx)

In this mode, the last 4 bits of the command define the number of bytes to write (from 1 to 16) (Command 0b00010000 will send 1 byte). Hydrabus will wait for the defined number of bytes, then send a 0x01 (acknowledge).

SWIO read register (0b00100000)

This command will issue a read register command on the SWIO line. The command expects 1 byte containing the register address and will output 4 bytes containing the register value (little endian)

SWIO write register (0b00110000)

This command will issue a write register command on the SWIO line. The command expects:

• 1 byte containing the register address
• 4 bytes containing the value to write (little endian) This command returns 0x01 if successful, 0x00 in case of error.

Configure 1-Wire peripheral (0b0100xyz0)

This allows to set the following parameters :

• x sets 1-wire interface using SWIO timings (see this document )
• y sets the pull-up resistors (if 1 use internal on-board pull-up resistors about 50Kohm else use external on-board pull-up resistors)
• z sets AUX[0] high (1) or low(0)

See https://github.com/hydrabus/hydrafw/wiki/HydraFW-1-wire-guide for explanation.

This command returns 0x01 if successful, 0x00 in case of error.