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Michael Piepers homepage | ||||
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BeOS Programs | ||||
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PalmBeach | ||||
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PSION Link Protocol description | ||||
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RFSV Protocol description | ||||
This command requests information to each individual DEVICE. Beforehand must; with the command FOPEN a file descriptor for a DEVICE to be requested. This value is to be transferred here. In order information to a well-known DEVICE too received, the command knows STATUSDEVICE are used.
The information of the first DEVICE returned the delivery with a further call is supplied the information of the next DEVICE. The end of the list is achieved if the message " eof " is transmitted as result.
It is to be noted that; all values, which are more greater than 8 bits in reverse order will transfer. The LOW byte sent as the first over the line and only then follows the HIGH byte!
That command FDEVICEREAD has always the same format. It is as a consequence;en built into the PLP:
| Header | PLP | RFSV FDEVICEREAD | Foot | CRC | ||
|---|---|---|---|---|---|---|
| 16 10 02 | 32 03 02 01 | Command 08 00 |
Size 02 00 |
file handle 01 00 |
10 03 | 12 34 |
A valid response takes place with the command RESPONSE and returns the delivery an error code. Per call the information is supplied by exactly one DEVICE. If one wants to have information to next DEVICES, must; one FDEVICEREAD transmit the command again.
| Header | PLP | RFSV RESPONSE | ... | ||
|---|---|---|---|---|---|
| 16 10 02 | 33 02 03 01 | Command 2a 00 |
Size 5a 00 |
Result 00 00 |
... ... |
| ... | DEVICE info. | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ... ... |
Version 02 00 |
Type 02 00 |
changeable 00 00 |
Device Size 00 00 00 00 |
Free space 00 00 00 00 |
Name "boot" |
Battery ff ff |
Reserve 16 * ff |
DEVICE name "BeOS" |
... ... |
| Foot | CRC | |
|---|---|---|
| 10 03 | 12 34 |
| bold | Values represent fixed of values, which are used accurately in such a way! |
| italic | Values represent examples, which have a different meaning on the basis the command. |
The command FDIRREAD consists of 3 information units. These have the following meanings:
| Length in byte | possible values | Meaning | |
|---|---|---|---|
| Command | 2 byte | 00 08 (fixed) | The command identifier has always the same value! |
| Size | 2 byte | 00 02 (fixed) | Always two bytes will transfer. |
| File name | 2 byte | variable | The file handle is to be transferred, which was returned the delivery, when with FOPEN the DEVICE was opened. |
The command FDEVICEREAD is answered with RESPONSE. This returns the delivery an error code as result. If 00 00 is returned the delivery, then no error occurred.
| Length in byte | possible values | Meaning | |||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Command | 2 byte | 00 2a (fixed) | The command identifier has always the same value! | ||||||||||||||||||||||||||||||||||||
| Size | 2 byte | variable | Dependent on the number of transmitted information units | ||||||||||||||||||||||||||||||||||||
| Result | 2 byte | variable | The result can obtain the following values:
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| Version | 2 byte | 00 02 | At present only the version 2 is supported. | ||||||||||||||||||||||||||||||||||||
| Type | 2 byte | variable | Determines, which type the DEVICE is. The following types are possible:
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| changeable | 2 byte | variable | If the medium can be changed, then this value 00 01 (TRUE) has otherwise 00 00 (FALSE). This value becomes e.g.: with a floppy disk drive set. | ||||||||||||||||||||||||||||||||||||
| Device Size | 4 byte | variable | The size of the complete DEVICE is indicated in bytes. | ||||||||||||||||||||||||||||||||||||
| Free space | 4 byte | variable | The number of the free storage space on DEVICES is indicated in bytes. | ||||||||||||||||||||||||||||||||||||
| Volume name | 16 byte | 0-terminated string | Here the volume name may be indicated. The name may be max. 15 byte long the last byte must be a 0-Byte | ||||||||||||||||||||||||||||||||||||
| Battery status | 2 byte | variable | Gives the status to the battery of the DEVICE on (e.g.: with a buffered RAM) | ||||||||||||||||||||||||||||||||||||
| Reserve | 16 byte | 16 * ff | For extensions kept free workstation | ||||||||||||||||||||||||||||||||||||
| DEVICE name | 16 byte | 0-terminated string | Here the DEVICE name is entered |
|
Michael Piepers homepage | ||||
|
BeOS Programs | ||||
|
PalmBeach | ||||
|
PSION Link Protocol description | ||||
|
RFSV Protocol description | ||||