Does the MQX driver support slave mode in MQX 3.8 or 4.0 for that matter on the K60 chip or is it only master mode.
I see a comment in the release notes that it has a master implementation
yes it does, we just didn't have the source of the DMA configured correctly...
Correction
In 3.8 we can Rx a character using DMA, but still debugging the slave driver as not operating as expected.
The new MQX 4.0 spi driver doesn't support slave operation. MQX 3.8 spi driver (called spi_legacy in MQX 4.0) has support for slave.