Read1WireBit

Read a bit from a 1-wire bus⁄device

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VERSION 1.46+ of the firmware, VERSION 58+ of the DLL

Description:

This is a function to send a 1-wire (MicroLAN) bit read on the previously selected port pin.

Command Syntax: (USBm.dll)

USBm_Reset1WireBit( device, dataarray )

The USBm_Reset1WireBit function syntax has these parts:

Remarks:

This command does not set the port direction pins or select the pin to use as the 1-wire bus – it is the Reset1Wire command that does this.

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VB Declaration

Public Declare Function USBm_Read1WireBit _     Lib “USBm.dll” _         (ByVal device As Byte, _                ByRef dataarray As Byte)_    As Integer

VB Example

Dim dataarray(8) As Byte     USBm_Read1WireBit 3, dataarray(0)

This code fragment addresses U4x1 device #3, and reads a bit from the 1-wire device. The read value is in “dataarray(0)”. 00h for a bit value of 0, and a value that is not 00h for a bit value of 1

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C Prototype

int USBm_Read1WireBit ( unsigned char device, unsigned char * data );

C Example

USBm_Read1WireBit ( 3, dataarray );

This code fragment addresses U4x1 device #3, and reads a bit from the 1-wire device. The read value is in “dataarray[0]”. 00h for a bit value of 0, and a value that is not 00h for a bit value of 1

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RobotBASIC

usbm_Read1WireBit(ne_DeviceNumber)

Returns a bit value that is read from the 1wire device.

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Raw Command  Format:

Raw Command  Format Details:

Byte 0 contains the command. Byte 1 is not used.

Byte 2 selects reading either a byte or a bit.

This command does not set the port direction pins or select the pin to use as the 1-wire bus – it is the Reset1Wire command that does this.

Raw Command Response Format:

Raw Command Response Format Details:

Byte 0 contains the command. Byte 1 is the byte⁄bit data that was read. Byte 2 through byte 7 are unused.

If a 0 bit is read, data = 0. If a 1 bit is read, data is not 0.