A fast and easily customised operating system
for ARM devices
OS_Byte 1
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Byte
» OS_Byte 1
OS_Byte 1
(SWI &06)
| Entry | |
|---|---|
| R0 | 1 |
| R1 | New value |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Machine type |
| R2 | Corrupted |
Use
The purpose of this call is to write a location that is unused by the OS, which can then be used to pass results between applications.
Notes
The location may be read (and written) with OS_Byte 241. System variables now provide a much better way of passing results, and should be used in instead.