??? 01/04/08 10:07 Read: times |
#149031 - Delay functions Responding to: ???'s previous message |
You might want to give your delay function a more meaningful name that makes the units of the parameter obvious; eg, void Wait_1us ( Uint8 n ); // Wait n+2 us void Wait_10us( Uint8 n ); // Wait 10n us... or whatever. When I did this, for Wait_1us, I couldn't get over the 2us "overhead" in the call, so I created a macro WAIT_1US to handle the offset: #define WAIT_1US( us ) Wait_1us( us-2 )With Wait_10us, there was plenty of slack to take up to allow for the overhead... See: http://www.keil.com/forum/docs/thread2938.asp |
Topic | Author | Date |
Number of CPU cycle for 8051 function call | 01/01/70 00:00 | |
Do it in assembler | 01/01/70 00:00 | |
Delay functions | 01/01/70 00:00 | |
A related trick | 01/01/70 00:00 | |
Offset | 01/01/70 00:00 | |
Offset | 01/01/70 00:00 | |
Sure | 01/01/70 00:00 | |
Over Drive? | 01/01/70 00:00 | |
a refinement | 01/01/70 00:00 | |
NOPs are so bad waste of space... | 01/01/70 00:00 | |
waste of space... waste of time | 01/01/70 00:00 | |
fixed delay | 01/01/70 00:00 | |
Variable delay | 01/01/70 00:00 | |
determinism of the cache | 01/01/70 00:00 | |
there are no cache misses in 'linear code' | 01/01/70 00:00 | |
I got only ONE cache miss... | 01/01/70 00:00 | |
Old Keil Thread | 01/01/70 00:00 | |
What about a Delay like this. | 01/01/70 00:00 | |
No, it won't. | 01/01/70 00:00 | |
Ok. | 01/01/70 00:00 | |
also | 01/01/70 00:00 | |
Also ... | 01/01/70 00:00 | |
Actually... | 01/01/70 00:00 | |
will. | 01/01/70 00:00 | |
ANSI C | 01/01/70 00:00 | |
Keil option: Disable ANSI casts | 01/01/70 00:00 | |
typo. | 01/01/70 00:00 |