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01/17/10 22:15
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 		 #172527 - If SDCC Then Keil
Responding to: ???'s previous message
If you happen to be using the SDCC compiler (as the linked code was apparently developed for) you may want to take a quick look to see if another compiler with optimizations turned on can produce tighter code. A tighter code may just allow you to get the same MCU to handle more servos within the 100uSec of the sample code.

A faster processor, as Erik has already suggested, may really be the scheme that gets you all the way to the solution for six servos without a lot of code rewriting. I could comment that if you were to convert over to an MCU such as the SiLabs C8051F344 (my current favorite) you could order the development board for this and get with it CD that has on it an evaluation copy of the Keil tool set that lets you make programs up to 8K in size. The Keil tool set will optimize your code down a lot.

Michael Karas


List of 41 messages in thread
TopicAuthorDate
Controlling multiple servo motors            01/01/70 00:00      
   executing code takes time            01/01/70 00:00      
      PWM code            01/01/70 00:00      
         Thanks...now, about the PCA timer..            01/01/70 00:00      
   If SDCC Then Keil            01/01/70 00:00      
      PWM IRQ code in C, bitops, 45 byte            01/01/70 00:00      
         Optimization having no effect.            01/01/70 00:00      
      PWM IRQ code in C, lookup table, 32 byte            01/01/70 00:00      
         I haven't understood the table lookup concept very well...            01/01/70 00:00      
            table lookup            01/01/70 00:00      
         PWM IRQ code in C, lookup table, 30 byte            01/01/70 00:00      
            Compiler specifics            01/01/70 00:00      
               absolutely-locating xdata at 256 byte boundary            01/01/70 00:00      
                  I see.            01/01/70 00:00      
            An example code..            01/01/70 00:00      
               Keil: Specifics and non-specifics            01/01/70 00:00      
                  Not really working...            01/01/70 00:00      
                     Enough power?            01/01/70 00:00      
                        RE: running 32 servo motors            01/01/70 00:00      
      The chip sounds perfect...            01/01/70 00:00      
         not worth it            01/01/70 00:00      
            Servo control will become difficult then...            01/01/70 00:00      
               output            01/01/70 00:00      
               HCT chips have ...            01/01/70 00:00      
                  Eval a concept with a single PCA and 3:8 HCT multiplexer?            01/01/70 00:00      
               Check their website            01/01/70 00:00      
                  Here is the code...            01/01/70 00:00      
                     "sbit MTRS=P2^0;" is not OK here            01/01/70 00:00      
                        Keil syntax?            01/01/70 00:00      
                           "#define" not working.."sbit" works            01/01/70 00:00      
                              Yes, you were correct originally!            01/01/70 00:00      
            Seconded            01/01/70 00:00      
   Servo_0.1.zip            01/01/70 00:00      
      links            01/01/70 00:00      
   Eventually feed the guys at http://servomaster.sf.net ?            01/01/70 00:00      
      servomaster.sf.net FLOSS            01/01/70 00:00      
   Maybe of some use...            01/01/70 00:00      
      Whoops... found a bug            01/01/70 00:00      
         What bug?            01/01/70 00:00      
            Bug            01/01/70 00:00      
   Improved version uploaded            01/01/70 00:00      

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