On Tue, Aug 24, 2010 at 11:42 AM, Sebastien Lelong < [email protected]> wrote:
> > > 2010/8/24 vasile surducan <[email protected]> > > So the frequency is a dword counted in hertz? > > > Yes > > >> Meaning if we need 29KHz we do pwm_set_frequency (29_000) ? >> > > Yes > > >> It doesn't work for me even with prescaler 1 at 40Mhz and PR2 register >> =0xFF it should work up to 39KHz >> > > But did you manually set prescaler and PR2 register ? By "not working", do > you mean the resulting frequency isn't 29KHz ? > PWM it's high all the time, but I found some other problems in the ISR...so probably it's something else I need to dig more... > > >> >> The second problem (and is quite a problem) is the length of a small code: >> >> pwm_max_resolution(1) >> pwm_set_frequency(29000) >> pwm1_set_dutycycle_highres(512) >> pwm1_on() >> >> is eating around 800 bytes... >> > > Yes, this is called "beauty" :) > > I guess dword is killing some bytes while computing frequency parameters > (have you tried to dig this in order to know where bytes are eaten ?). I > guess another procedure where frequency is a constant (assuming you don't > need variable frequency) could be added: > > const dword PWM_FREQUENCY = 29_000 > include pwm_hardware > ... > pwm_max_resolution(1) > -- pwm_set_frequency(29000) ; not needed anymore > pwm1_set_dutycycle_highres(512) > pwm1_on() > > > Somewhere in pwm libs: > > if defined(PWM_FREQUENCY) then > -- user (probably Vasile) needs a constant frequency) > -- => setup freq params as in pwm_set_frequency but this time using > -- a constant. > end if > > > Cheers, > Seb > > > >> >> Vasile >> >> >> On Mon, Aug 23, 2010 at 1:02 PM, Sebastien Lelong < >> [email protected]> wrote: >> >>> Hi Vasile, >>> >>> Maybe "pwm_set_frequency(dword in freq)", in pwm_common.jal ? >>> See: >>> http://justanotherlanguage.org/content/jallib/tutorials/tutorial_pwm2 >>> >>> Cheers, >>> Seb >>> >>> 2010/8/23 vasile surducan <[email protected]> >>> >>>> Hi all, >>>> >>>> In the current pwm library (pwm_common.jal, pwm_hardware.jal, >>>> pwm_ccpx.jal) the pwm frequency can be set exactly (in terms of KHz) ? >>>> >>>> thx, >>>> Vasile >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "jallib" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]<jallib%[email protected]> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/jallib?hl=en. >>>> >>> >>> >>> >>> -- >>> Sébastien Lelong >>> http://www.sirloon.net >>> http://sirbot.org >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "jallib" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]<jallib%[email protected]> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/jallib?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<jallib%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/jallib?hl=en. >> > > > > -- > Sébastien Lelong > http://www.sirloon.net > http://sirbot.org > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<jallib%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
