Hello,
In the MQX 4.0.2 SPI driver uses DMA by default.
See release notes document:
Introduced the first version of eDMA driver - the driver is experimental and will be further extended in the next MQX version. Documentation is not provided.
Kinetis SPI driver was updated to use the eDMA driver.
SPI I/O Driver
This driver supports the operation master mode. If enabled in user configuration, the SPI device drivers are installed during the BSP startup code as "spi0:” (or "spiX:” where X is index of the SPI module used). The SPI driver is significantly rewritten in the MQX 4.0, so that there is no distinct interrupt or polled driver type. See I/O User Guide for details. On Kinetis and Vybrid platforms, the driver uses DMA to function.
Luis
