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May 13, 2015
06:04 AM
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May 13, 2015
06:04 AM
Hi,
I have a problem with changing PWM frequency on the fly (XCM4500 AC, Dave 3.1.10, PWMSP002_SetPwmFreqAndDutyCycle function). With dithering off everything works fine. Problem is with dithering on (dither mode - change PWM period). In this case decreasing frequency works well but increasing frequency sometimes causes 550us interruption in PWM output. I tried directly write PRS, CR1S and DITS and GCSS register instead of use PWMSP002_SetPwmFreqAndDutyCycle. It gives no help. Can you tell me how to solve this problem?
BR
TM
I have a problem with changing PWM frequency on the fly (XCM4500 AC, Dave 3.1.10, PWMSP002_SetPwmFreqAndDutyCycle function). With dithering off everything works fine. Problem is with dithering on (dither mode - change PWM period). In this case decreasing frequency works well but increasing frequency sometimes causes 550us interruption in PWM output. I tried directly write PRS, CR1S and DITS and GCSS register instead of use PWMSP002_SetPwmFreqAndDutyCycle. It gives no help. Can you tell me how to solve this problem?
BR
TM
7 Replies
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May 17, 2015
10:45 PM
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May 17, 2015
10:45 PM
Hi TM,
A bug has been found in CCUx: Shadow transfer with dither does not work. The errata sheet update was in-progress. Will update you once released.
Best regards,
Sophia
A bug has been found in CCUx: Shadow transfer with dither does not work. The errata sheet update was in-progress. Will update you once released.
Best regards,
Sophia
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May 22, 2015
03:19 AM
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May 22, 2015
03:19 AM
sophia wrote:
A bug has been found in CCUx: Shadow transfer with dither does not work.
Thank you for answer. Can you tell me whether this bug affects XMC4400? If XMC4400 is free of this bug I can replace my XMC4500 by XMC4400.
Best regards,
TM
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May 25, 2015
01:52 AM
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May 25, 2015
01:52 AM
Hi TM,
Unfortunately, the bug exists in the module (CCUx) which is the same for both XMC4400 & XMC4500.
Best regards,
Sophia
Unfortunately, the bug exists in the module (CCUx) which is the same for both XMC4400 & XMC4500.
Best regards,
Sophia
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May 25, 2015
11:05 PM
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May 25, 2015
11:05 PM
Can you say how long it will take to remove this bug? A few months? Or maybe rather years? I tried to do software dithering but the PWM frequency is too high and the microcontroller is not able to handle this. If time is short (months) then I can wait, but if will be longer then I have to look for another solution.
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May 27, 2015
01:50 AM
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May 27, 2015
01:50 AM
Hi TM,
I'm sorry to say that there is no fix plan for the existing products at this time being. It will only be fixed in the future products. However, you may try use 2 timers. One is generating the PWM signal, while the other is used to gate the 1st timer for 1 clock cycle every N cycles.
Best regards,
Sophia
I'm sorry to say that there is no fix plan for the existing products at this time being. It will only be fixed in the future products. However, you may try use 2 timers. One is generating the PWM signal, while the other is used to gate the 1st timer for 1 clock cycle every N cycles.
Best regards,
Sophia
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Dec 16, 2015
04:18 AM
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Dec 16, 2015
04:18 AM
Hello again,
There are new devices (XMC4800). Is there CCUx module fixed in this device?
Best regards,
TM
There are new devices (XMC4800). Is there CCUx module fixed in this device?
Best regards,
TM
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Dec 17, 2015
09:35 AM
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Dec 17, 2015
09:35 AM
HI TM,
I am sorry to inform that this is not fixed on the XMC4800 device.
Regards,
Daryl
I am sorry to inform that this is not fixed on the XMC4800 device.
Regards,
Daryl