Set a single one of the port bits to 0⁄low
Description:
This is a function that resets a single bit⁄line low.
Command Syntax: (USBm.dll)
USBm_ResetBit( device, bit )
The USBm_ResetBit function syntax has these parts:
| Part | Description |
| device | A zero-based index to address the appropriate USB device. |
| bit | The bit that will be affected. |
Remarks:
Bit⁄Line Selection
| Byte Value | Result | Byte Value | Result | |
| 00h | Affect A.0 (Port A, pin 0) | 08h | Affect B.0 | |
| 01h | Affect A.1 | 09h | Affect B.1 | |
| 02h | Affect A.2 | 0Ah | Affect B.2 | |
| 03h | Affect A.3 | 0Bh | Affect B.3 | |
| 04h | Affect A.4 | 0Ch | Affect B.4 | |
| 05h | Affect A.5 | 0Dh | Affect B.5 | |
| 06h | Affect A.6 | 0Eh | Affect B.6 | |
| 07h | Affect A.7 | 0Fh | Affect B.7 |
VB Declaration
| Public Declare Function USBm_ResetBit _ Lib “USBm.dll” _ (ByVal device As Byte, _ ByVal bit As Byte) _ As Integer |
VB Example
| USBm_ResetBit 0, 0 |
This code fragment clears bit A.0 of device 0.
C Prototype
| int USBm_ResetBit( unsigned char device, unsigned char bit ); |
C Example
RobotBASIC
usbm_ResetBit(ne_DeviceNumber,ne_PinNumber)
Returns true if successful, false otherwise. This function makes high⁄low a particula pin on any of the ports. The pin number is 0 for A0 1 for A1…7 for A7…8 for B0, ….15 for B7.
Raw Command Format:
| Byte Number | Description |
| 0 | 08h: ResetBitCmd |
| 1 | Data – This is the line to reset: D0 – D15 |
| 2 | <not used> |
| 3 | <not used> |
| 4 | <not used> |
| 5 | <not used> |
| 6 | <not used> |
| 7 | <not used> |
Raw Command Format Details:
Byte 0 contains the command. Byte 1 contains the line to reset. Byte 2 through byte 7 are unused.
Bit⁄Line Selection
| Byte Value | Result | Byte Value | Result | |
| 00h | Affect A.0 | 08h | Affect B.0 | |
| 01h | Affect A.1 | 09h | Affect B.1 | |
| 02h | Affect A.2 | 0Ah | Affect B.2 | |
| 03h | Affect A.3 | 0Bh | Affect B.3 | |
| 04h | Affect A.4 | 0Ch | Affect B.4 | |
| 05h | Affect A.5 | 0Dh | Affect B.5 | |
| 06h | Affect A.6 | 0Eh | Affect B.6 | |
| 07h | Affect A.7 | 0Fh | Affect B.7 |
Raw Command Response Format:
| Byte Number | Description |
| 0 | 08h: ResetBitCmd |
| 1 | <not used> |
| 2 | <not used> |
| 3 | <not used> |
| 4 | <not used> |
| 5 | <not used> |
| 6 | <not used> |
| 7 | <not used> |
Raw Command Response Format Details:
Byte 0 contains the command. Byte 1 through byte 7 are unused.
Raw Command Example Usage:
The command 08-01-00-00-00-00-00-00 will set lines A.1 low, assuming it is configured as an output.