| ??? 11/27/04 19:50 Read: times |
#82092 - very fast 20ms ??? Responding to: ???'s previous message |
PID summary:
P: One multiplication. I: One multiplication, one addition. D: One substraction, one division Two additions to bring them all together. One infinite loop to keep things rolling. Reading input, writing output. Optional extensions like bias (1 addition), rate limits (2 conditionals), maximum value violation exception (2 conditionals), extra safety checks (n conditionals). All in floating point. Everything must fit in 2000 cycles on a standard /12 12MHZ MPU. Taking 100 cycles (Excessive!) for a single operation, you need maybe 1500 cycles to have all the standard stuff done. So where's the problem? |
| Topic | Author | Date |
| help about pid | 01/01/70 00:00 | |
| Floating point? | 01/01/70 00:00 | |
| Keil floating-point performance | 01/01/70 00:00 | |
| Search the forum | 01/01/70 00:00 | |
| Floating Point Vs Mixed point | 01/01/70 00:00 | |
| You mean Fixed Point | 01/01/70 00:00 | |
| Mixed not Fixed | 01/01/70 00:00 | |
| Warnings about Floating Point | 01/01/70 00:00 | |
| Shortcuts | 01/01/70 00:00 | |
| Implied aka Fixed point | 01/01/70 00:00 | |
| Another Shortcut | 01/01/70 00:00 | |
| Answering the question | 01/01/70 00:00 | |
| Autotunning? | 01/01/70 00:00 | |
| PID Tricks and Tuning | 01/01/70 00:00 | |
| Great Stuff ! | 01/01/70 00:00 | |
| I followed your idea... | 01/01/70 00:00 | |
| Another couple tricks | 01/01/70 00:00 | |
| tests | 01/01/70 00:00 | |
limit cycle tuning | 01/01/70 00:00 | |
| PID to control a Peltier | 01/01/70 00:00 | |
| An idea to try | 01/01/70 00:00 | |
| very fast 20ms ??? | 01/01/70 00:00 | |
| 20.000, not 2000. | 01/01/70 00:00 | |
| very fast 20ms ??? | 01/01/70 00:00 | |
| in points... | 01/01/70 00:00 |