Portable_Speed2 3 (changes)
Showing changes from revision #1 to #2:
Added | Removed | Changed
Programmer's Portable Reference Manuals
» Part 15 – SWI Calls
» Portable Portable_Speed2
» Portable_Speed2 3Portable_Speed2
» Portable_Speed2 3
Portable_Speed2 3
(SWI &42FCE)
| Entry | |
|---|---|
| R0 | 3 (Reason code) |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Currently configured ‘slow’ speed, in MHz |
| R2 | Currently configured ‘fast’ speed, in MHz |
Use
The purpose of this call is to read the currently configured ‘slow’ and ‘fast’ speeds. These are the speeds that Portable_Speed will use when asked to switch the CPU to either the ‘slow’ or ‘fast’ speed.
Notes
Portable_Speed2 9 provides similar functionality to this call, but the speeds will be expressed as indices into the list of supported CPU speeds, not as raw MHz values.
To find out more information about the available CPU speeds, see Portable_Speed2 4 and Portable_Speed2 5. To find the current CPU speed, see Portable_Speed2 0.
To set the CPU speed, see Portable_Speed2 2 or Portable_Speed2 8 (to set the desired ‘slow’ and ‘fast’ speeds), and Portable_Speed (to switch between the configured ‘slow’ and ‘fast’ speeds).
See also
Social
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.