Using multiple displays on the same SPI bus - only one display works. about lovyangfx HOT 3 CLOSED

hello @jamclaug
If you use a common GPIO, spi_host must also be common.
There is no need to separate LGFX_DisplayA and LGFX_DisplayB.
You only need to use LGFX_DisplayA for both panel.s

static lgfx::LGFX_SPI<LGFX_DisplayA> lcd;
static lgfx::LGFX_SPI<LGFX_DisplayA> lcdB;

If you want to run VSPI and HSPI DMAs at the same time, you must not use a common GPIO. Assign a dedicated GPIO to each panel respectively.

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What effect would it have to only use one DMA for two screens?

Also - That seems to have no effect.

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During DMA transfer, the CPU can do other work.
It works if you can get the CPU to do its job properly.
If you don't let the CPU do any other work during a DMA transfer, it won't do much good.

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