| Andy Neil 01/19/10 06:34 Read: 123 times Basingstoke Uk |
#172593 - I see. Responding to: Frieder Ferlemann's previous message |
Andy Neil said:
What is the point in absolutely-locating it? Seems unnecessary to me... Frieder Ferlemann said:
The point is to tell the compiler that it's located at a 256 byte boundary. So it does not need a full 16 bit addition of array base address and index but instead can directly load dpl with the high byte of the address and dpl with the index. I see - good point. AFAIK you'd tell Keil the absolute location of the variable at the linking stage (which is to late for code generation so the 16 bit addition has been generated). C51 does have the _at_ keyword to do it at compile time So out of the box Keil probably cannot do it. It has the opportunity - I have to idea whether it will take advantage of it! |
| Topic | Author | Date |
| Controlling multiple servo motors | Yash Chitalia | 01/17/10 14:47 |
| executing code takes time | Erik Malund | 01/17/10 15:27 |
| PWM code | Steve M. Taylor | 01/17/10 15:35 |
| Thanks...now, about the PCA timer.. | Yash Chitalia | 01/17/10 16:06 |
| If SDCC Then Keil | Michael Karas | 01/17/10 16:15 |
| PWM IRQ code in C, bitops, 45 byte | Frieder Ferlemann | 01/18/10 05:19 |
| Optimization having no effect. | Yash Chitalia | 01/18/10 11:36 |
| PWM IRQ code in C, lookup table, 32 byte | Frieder Ferlemann | 01/18/10 05:29 |
| I haven't understood the table lookup concept very well... | Yash Chitalia | 01/19/10 00:55 |
| table lookup | Frieder Ferlemann | 01/19/10 02:39 |
| PWM IRQ code in C, lookup table, 30 byte | Frieder Ferlemann | 01/19/10 03:07 |
| Compiler specifics | Andy Neil | 01/19/10 04:35 |
| absolutely-locating xdata at 256 byte boundary | Frieder Ferlemann | 01/19/10 05:00 |
| I see. | Andy Neil | 01/19/10 06:34 |
| An example code.. | Yash Chitalia | 01/20/10 02:20 |
| Keil: Specifics and non-specifics | Andy Neil | 01/20/10 02:50 |
| Not really working... | Yash Chitalia | 01/20/10 03:55 |
| Enough power? | Per Westermark | 01/20/10 09:45 |
| RE: running 32 servo motors | Andy Neil | 01/20/10 10:34 |
| The chip sounds perfect... | Yash Chitalia | 01/18/10 11:47 |
| not worth it | Erik Malund | 01/18/10 12:10 |
| Servo control will become difficult then... | Yash Chitalia | 01/18/10 12:42 |
| output | Andy Peters | 01/18/10 12:52 |
| HCT chips have ... | Erik Malund | 01/18/10 14:12 |
| Eval a concept with a single PCA and 3:8 HCT multiplexer? | Frieder Ferlemann | 01/18/10 14:36 |
| Check their website | Andy Neil | 01/18/10 14:44 |
| Here is the code... | Yash Chitalia | 01/18/10 15:28 |
| "sbit MTRS=P2^0;" is not OK here | Frieder Ferlemann | 01/18/10 16:11 |
| Keil syntax? | Andy Neil | 01/18/10 17:36 |
| "#define" not working.."sbit" works | Yash Chitalia | 01/18/10 23:32 |
| Yes, you were correct originally! | Andy Neil | 01/19/10 01:22 |
| Seconded | Andy Neil | 01/18/10 12:45 |
| Servo_0.1.zip | Murray R. Van Luyn | 01/18/10 15:02 |
links | James Hinnant | 02/18/10 21:10 |
| Eventually feed the guys at http://servomaster.sf.net ? | Frieder Ferlemann | 01/18/10 15:12 |
| servomaster.sf.net FLOSS | James Hinnant | 02/04/10 11:48 |
| Maybe of some use... | James Bowmaster | 02/10/10 14:40 |
| Whoops... found a bug | James Bowmaster | 02/10/10 16:35 |
| What bug? | Andy Neil | 02/10/10 16:41 |
| Bug | James Bowmaster | 02/10/10 18:47 |
| Improved version uploaded | James Bowmaster | 02/12/10 21:26 |