Hi Andre marcus,
Thanks a lot for your effort.
Could you please also share your solution? Do you use one DMA channel now?
My method is using the Variable-Frequency PWM Mode, then configure the CMPLD1 and CMPLD2 in pair, then keep the different PWM has the same frequency. The original customer wants to change the PWM duty for each continous PWM, that's why I use two channel to trigger and load the CMPLD1 and CMPLD2 seperated.
AT_NONCACHEABLE_SECTION_INIT(volatile uint16_t g_Cmpld1buf[10]) = {338, 300, 263, 225, 188, 150, 112, 75, 37, 188};//10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%,90%, 50%
AT_NONCACHEABLE_SECTION_INIT(volatile uint16_t g_Cmpld2buf[10]) = {37 , 75 , 112, 150, 187, 225, 263, 300, 338, 187};//10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%,90%, 50%
As the CMPLD1 and CMPLD2 is the different MUX channel, then I used two DMA mux channel:
Any updated information, please kindly let me know.
Best Regards,
Kerry
Hi Kerry,
Attached my scope snapshot. I see the duty cycle changing is working properly.
Best Regards,
Leon.
Hi Leonid Shigris,
After you add the new configuration, please also share your test result(PWM wave from the oscilloscope), is there any issue on your side?
About the s_emdaTcd size, actually, it is the TCD size, it is 32Bytes, you also can find it from the definition:
RM also give the TCD structure:
Wish it helps you!
If you still have questions about it, please kindly let me know.
Have a great day,
Kerry
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Thanks a lot for your patience and understanding.
I get a large step today, please check the PWM result at first, I set it to output the duty as:
AT_NONCACHEABLE_SECTION_INIT(volatile uint16_t g_Cmpld1buf[10]) = {338, 300, 263, 225, 188, 150, 112, 75, 37, 188};//10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%,90%, 50%
AT_NONCACHEABLE_SECTION_INIT(volatile uint16_t g_Cmpld2buf[10]) = {37 , 75 , 112, 150, 187, 225, 263, 300, 338, 187};//10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%,90%, 50%
This is the result:
You can find the result PWM duty is really 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%,90%, 50%
About the code, I use the GPIO_AD_B1_00_GPIO1_IO16 pin to trigger the oscilloscope to save the PWM picture, so in pin_mux.c，modify these code:
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_00_GPIO1_IO16, /* GPIO_AD_B1_00 is configured as QTIMER3_TIMER0 */
0U); /* Software Input On Field: Input Path is determined by functionality */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_AD_B1_00_GPIO1_IO16, /* GPIO_AD_B1_00 PAD functional properties : */
0x10B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
About the main code, I I enabled two DMA channels, one is for CMPLD1, another is for CMPLD2, then enable the QTIMR CMPLD1, CMPLD2 DMA EN bit, and start the DMA two channels, the DMA will transfer the data to CMPLD1, CMPLD2 when the condition happens.
Please still use this SDK code：
SDK_2.6.1_EVKB-IMXRT1050\boards\evkbimxrt1050\driver_examples\qtmr\inputcapture_outputpwm_dma
just use my attached qtmr_inputcapture_outputpwm_dma.c to replace the orginal files.
Then you can test it.
Wish it helps you!
If you still have questions about it, please kindly let me know.
Have a great day,
Kerry
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Hi Leonid Shigris,
Today, I just make the CMPLD2 output changed the duty with g_Cmpld2buf[10]) = {37 , 75 , 112, 150, 187, 225, 263, 300, 338, 187}; CMP1 is fixed. so the frequency is also changed, because high pulse is changed, but low pulse didn't changed accordingly.
So, I still need to consider more ways, how to make both the CMPLD1 and CMPLD2 change in pairs with DMA.
Anyway, any updated information, will let you know.
Best Regards,
Kerry
