| ??? 09/16/05 09:51 Read: times |
#101158 - PWM spoiled by Rx Responding to: ???'s previous message |
So now you have a completely interrupt-less one-loop system, haven't you.
The problem with not absolutely clearly "drawn" features might be related to the fact, that you are spending some processing time in the receiving and decoding routines, making the PWM on/off ratio different for that cycle than in other cycles. To check if this is the case you could try to display only a single spot, but keep transmitting the same X-Y pair - I'll bet you'll get a "shaking" point or something similar. If this is the case, you could either change the PWM to timer-interrupt-based (which requires thorough understanding of the interrupts system which you have abandoned), or change to a derivative with PCA as has been suggested previously, or make a compensation, which would take the same time as the decoding, being called when the RI1 flag is not set at the end of the loop (beware this would reduce the "dynamic range" of the PWM quite remarkably). Jan Waclawek |
| Topic | Author | Date |
| Laser system serial port com | 01/01/70 00:00 | |
| MHz? | 01/01/70 00:00 | |
| 11.059 | 01/01/70 00:00 | |
| also... | 01/01/70 00:00 | |
| Even more... anybody got any ideas? | 01/01/70 00:00 | |
| Values in | 01/01/70 00:00 | |
| text??? | 01/01/70 00:00 | |
| thanks so far | 01/01/70 00:00 | |
| Back to basics | 01/01/70 00:00 | |
| Oh, come on... | 01/01/70 00:00 | |
| "Program" or "Code?" | 01/01/70 00:00 | |
| Oh dear... | 01/01/70 00:00 | |
| Fundamental Comms Problem | 01/01/70 00:00 | |
| Serial Code - Doomed! | 01/01/70 00:00 | |
| this is getting ridiculous | 01/01/70 00:00 | |
| learning process | 01/01/70 00:00 | |
| oh well | 01/01/70 00:00 | |
| agreed - waiting for the real stuff :-) | 01/01/70 00:00 | |
| cart before horse | 01/01/70 00:00 | |
| weekend approaching? | 01/01/70 00:00 | |
| sure we can, but then why do you say the | 01/01/70 00:00 | |
| this belong in the chat, but since it is | 01/01/70 00:00 | |
| hrm | 01/01/70 00:00 | |
| make an effort do not "whip up some code | 01/01/70 00:00 | |
| facts & emotions | 01/01/70 00:00 | |
| k | 01/01/70 00:00 | |
| Good luck with the 430's | 01/01/70 00:00 | |
| int | 01/01/70 00:00 | |
| Slight misconception. | 01/01/70 00:00 | |
| Next step | 01/01/70 00:00 | |
| -1 provocative troll | 01/01/70 00:00 | |
| read | 01/01/70 00:00 | |
| which derivative? | 01/01/70 00:00 | |
| dallas | 01/01/70 00:00 | |
| DS89C420 | 01/01/70 00:00 | |
| system im using | 01/01/70 00:00 | |
| int | 01/01/70 00:00 | |
| Process | 01/01/70 00:00 | |
| Why do you persist | 01/01/70 00:00 | |
| 2 byte protocol | 01/01/70 00:00 | |
| Intersting, but... | 01/01/70 00:00 | |
| very interesting | 01/01/70 00:00 | |
| How to proceed | 01/01/70 00:00 | |
| a problem and a suggestion | 01/01/70 00:00 | |
| Problems many & varied | 01/01/70 00:00 | |
| Begin at the beginning! | 01/01/70 00:00 | |
| started again | 01/01/70 00:00 | |
| Re: started again | 01/01/70 00:00 | |
| ah crap. | 01/01/70 00:00 | |
| ah my eyes! | 01/01/70 00:00 | |
| continued.. | 01/01/70 00:00 | |
| Second UART | 01/01/70 00:00 | |
| int vector | 01/01/70 00:00 | |
| Look at the datasheet ! | 01/01/70 00:00 | |
| yup | 01/01/70 00:00 | |
| serial port 1 interrupt vector | 01/01/70 00:00 | |
| okay | 01/01/70 00:00 | |
| Still not OK | 01/01/70 00:00 | |
| ISR reset | 01/01/70 00:00 | |
| take rest | 01/01/70 00:00 | |
| rest........ | 01/01/70 00:00 | |
| STOP | 01/01/70 00:00 | |
| just to be sure... | 01/01/70 00:00 | |
| man int triggering | 01/01/70 00:00 | |
| Craig, please remove this thread this is | 01/01/70 00:00 | |
| Request | 01/01/70 00:00 | |
| num | 01/01/70 00:00 | |
| again | 01/01/70 00:00 | |
| Thanks ALOT Jan !! | 01/01/70 00:00 | |
| works, so now do the reading | 01/01/70 00:00 | |
| serial port int | 01/01/70 00:00 | |
| transmit | 01/01/70 00:00 | |
| transmit | 01/01/70 00:00 | |
| Oh dear | 01/01/70 00:00 | |
| I dont give up. | 01/01/70 00:00 | |
| er | 01/01/70 00:00 | |
| brains? | 01/01/70 00:00 | |
| Or lack thereof... | 01/01/70 00:00 | |
| Persistance is a virtue | 01/01/70 00:00 | |
| basics | 01/01/70 00:00 | |
| updated | 01/01/70 00:00 | |
| Solve i problem at a time | 01/01/70 00:00 | |
| one more problem knocked down | 01/01/70 00:00 | |
| PWM spoiled by Rx | 01/01/70 00:00 | |
lines | 01/01/70 00:00 |