My source of information is the Technical Reference Manual. The chapter about SPI indicates that SPI3 is connected to the GDMA, at least in a limited fashion.
Section 30.9, which details differences between SPI2 and SPI3 states the following:
DMA-controlled configurable segmented transfer is only supported in GP-SPI2. Therefore, CONF state is
not used in GP-SPI3.
...
Apart from that, the functions of GP-SPI2 and GP-SPI3 are the same. GP-SPI2 can use all the GP-SPI registers,
while GP-SPI3 can only use some of the GP-SPI registers
The diagrams and the above quotes indicate to me that SPI3 has at least some limited DMA support. Unfortunately, I believe this is missing from esp-hal.
bugadani
commented
1 year ago
My source of information is the Technical Reference Manual. The chapter about SPI indicates that SPI3 is connected to the GDMA, at least in a limited fashion.
Section 30.9, which details differences between SPI2 and SPI3 states the following:
The diagrams and the above quotes indicate to me that SPI3 has at least some limited DMA support. Unfortunately, I believe this is missing from
esp-hal.