In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robsubjavelin wrote:

Hi, 

 

My first SX28 program (basic+asm) is for control a DC motor, it runs to a position received by an uart (2400). 

On the motor there is a gearbox (1:30) and on the shaft there are 12 magnets (N-Z-N-Z...). An Allegro Hall sensor

gives speed and direction back. PWM signal (1960Hz, 0-255) and sensor are made in the interrupt routine (asm). 

 

Everything works well. To compensated the clock ticks caused by the interrupt, I looked at the scope 

and the timing for 2400 baud (4.16msec). By changing the [i]EffectiveHz[/i] parameter of [b]FREQ[/b] in 18_750_000

the timing was good and all works well. Interrupt = 500_000 (2usec)

I did not compensated the assembly Hall sensor part, because it was not needed!!. Can someone explain this?

 

So there are some questions left:

- how to [b]calculate[/b] the effectivehz parameter

- must i compensated the Hall sensor part as well for clock ticks

- please any reaction on the source

 

Regards

Rob.

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