"Three phase" PWM for an LED "matrix"

[SamMiddleton]

Hi.
I have a project that involves using an STM32U535 to control the LEDs shown in the picture.
I feel it should be possible to control the COL-x signals with synchronized timers that also trigger DMA transfers to control the ROW-y signals, but I can't figure out how to go about doing that, can I have some help?
The picture also includes a rough sketch of the signal timing. I want each phase to be a different length to control the brightness and I think that dead time between phases might be nice to have.
LED "Matrix" schematic w/ timing sketch

[jiangfan]

It seems to be similar to 7-segment LED display. You may search internet for corresponding documents.

[waclawek.jan]

The simplest thing to start with is to use one single timer in which yellow is one channel in PWM1 mode, red other channel in PWM2, and green in Combined mode of two remaining channels.

You can of course pull it out also as a cascade of three timers in master-slave configuration, circularly, triggering each other, all in One-pulse mode. Dead time would be almost inevitable there.

Triggering DMA may be a another challenge in either case, depending on the details of implementation. 

JW