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[jhqian]

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[sadkotheguest]

Could you help with the PWM counter synchronisation using the SYNCI signal (#23)?

[sadkotheguest]

@jhqian , hello!
Do you have any ideas how to realize synchronous parallel bus for HPM62xx?
(according to #37)

[sadkotheguest]

Yes, the frequency is about 20 MHz. Bus width is 8 bit.
There aren't any address lines - only 8-bit data lines and clock.

[jhqian]

so host mcu will only write 8-bit width data to that parallel device at 20Mhz for certain period of time. mcu will not read from that device or be notified by that device (interrupt), correct?

[sadkotheguest]

Yes, MCU will only write 8-bit width data to external device with synchronous clock signal.
And I don't need any interrupts.

[jhqian]

it seems can be achieved as following:

• get 8 gpios from a same fgpio port
• use one gptmr channel to generate clock
• use one gptmr cmp to generate event to trigger DMA to move data from ram to gpio port (timing should be checked according to DAC datasheet)

[sadkotheguest]

Ok, thank you for advices.