topic Re: mkE04Z8VFK4 change frequency on pwm in Kinetis Microcontrollers

mkE04Z8VFK4 change frequency on pwm

evgenybelov — Wed, 07 Sep 2016 06:55:10 GMT

Hi, I am using codewarrior for mkE04Z8VFK4 programming.

I am looking for method to change frequency of pwm and methods(see attached picture) that I can see only for duty cycle?

Thanks,

Evgeny.

P.S.

Can I use the PPG component for frequency and duty cycle change?

I am trying to config the period and got the Peripheral is not set properly (property "Period device"), please see attached picture.

Re: mkE04Z8VFK4 change frequency on pwm

Robin_Shen — Thu, 08 Sep 2016 08:03:12 GMT

Hi Evgeny,

This component(PWM_LDD) implements a pulse-width modulation generator that generates a signal with variable duty and fixed frequency (period).

You can use the PPG component for frequency and duty cycle change. This component implements a programmable pulse generator that generates a signal with variable duty and variable cycle (period).

Please set properly period, for example: 6800014.6484375 MHz or 6799833.984375.

Best Regards,

Robin

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Re: mkE04Z8VFK4 change frequency on pwm

evgenybelov — Thu, 08 Sep 2016 09:50:24 GMT

Hi Robin,

Thank you for help.

Now I am using PPG module and trying to change the frequency at once in 1ms from 2Mhz to 5Mhz in step of 200kHz, and I see the delay(the amplitude in high position) of 5ms, it`s any way to change the frequency with minimal delay time?

Please see attached print screen.

Thanks,

Evgeny

Re: mkE04Z8VFK4 change frequency on pwm

Robin_Shen — Mon, 12 Sep 2016 09:27:23 GMT

Hi Evgeny,

Would you please attach the project here? So that I can test it on my FRDM-KE04Z board.

Best Regards,

Robin

Re: mkE04Z8VFK4 change frequency on pwm

evgenybelov — Tue, 13 Sep 2016 09:29:07 GMT

Hi Robin,

Thank you Robin.

I solved the last problem.

I have new issue, I use the SetFreqkHz command and I see that the command allocate about 600byte in cpu memory and I have overflow of 844bytes , what is wrong?

Please find attached link.

project

Thanks,

Evgeny.

Re: mkE04Z8VFK4 change frequency on pwm

Robin_Shen — Sun, 18 Sep 2016 08:01:07 GMT

Hi Evgeny,

There is no enough space in m_text for your code.

The code/object generated by Processor Expert is too big to be loaded in m_text section. And the Optimize size(-Os) has been selected in Optimization level.

I am afraid you need decress some Component which eat too many memory.

Best Regards,

Robin

Re: mkE04Z8VFK4 change frequency on pwm

evgenybelov — Tue, 20 Sep 2016 07:10:17 GMT

Hi Robin,

I saw that I have empty space that reserved for vector table and changed the project setting and now I can load the code.

MEMORY {
m_interrupts (RWX) : ORIGIN = 0x00000000, LENGTH = 0x000000C0
my_flash_seg (RX) : ORIGIN = 0x000000C0, LENGTH = 0x00000312
m_text (RX) : ORIGIN = 0x00000410, LENGTH = 0x00001BF0
m_data (RW) : ORIGIN = 0x1FFFFF00, LENGTH = 0x00000400
m_cfmprotrom (RX) : ORIGIN = 0x00000400, LENGTH = 0x00000010
}

/* Define output sections */
SECTIONS
{
/* Section created to relocate code in specific Flash address */
.my_section :
{
. = ALIGN(4);
KEEP( *(.mysegment)) /* This is the tag you use in code */
. = ALIGN(4);
} > my_flash_seg

And I am using the

" __attribute__ ((section(".mysegment"))) "

Code is running but I get Alert before burn in the code , Please see attached picture.