74HC595 Bit angle modulation (BAM) on ESP32 IDF SDK

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Bitscat: Posts: 1; Joined: Wed Feb 22, 2023 4:58 pm

74HC595 Bit angle modulation (BAM) on ESP32 IDF SDK

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Postby Bitscat » Thu Feb 23, 2023 4:15 am

I'm working on ESP32 + 74HC595, i want to use BAM(Bit angle modulation) to control the brightness of each LED at output 74HC595.
I'm trying with SPI + LEDC, but LEDC is not "fast state change", so I still see the LED blinking. It also takes up a lot of CPU processing time.
So i think DMA + SPI is better idea, but I don't know how DMA can work with Linked Descriptor. (My code in image)

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