LPSPI FreeRTOS Initialization Only for Master?

nbgatgi — Mon, 29 Jul 2019 19:13:35 GMT

Within the MCUXpresso SDK, the non-RTOS initialization drivers for LPSPI include "LPSPI_MasterInit" and "LPSPI_SlaveInit". When FreeRTOS is included, the associated RTOS driver is "LPSPI_RTOS_Init" which I initially presumed would have parameters for master or slave, but that doesn't appear to be the case. Within LPSPI_RTOS_Init, LPSPI_MasterInit is called, but LPSPI_SlaveInit is not. In fact, in the file "fsl_lpspi_freertos.c" there is no reference to the word "slave" at all!

When looking at the LPSPI / FreeRTOS example code (not available in the SDK for the RT1060 and RT1064), the FreeRTOS slave task initializes directly with "LPSPI_SlaveInit".

Why is their only a master LPSPI initialization function for FreeRTOS?

Re: LPSPI FreeRTOS Initialization Only for Master?

danielchen — Wed, 31 Jul 2019 15:11:53 GMT

Hi Nick:

Currently we do not plan to prepare FreeRTOS SPI slave driver. We have created initial set of drivers and we decided that Baremetal ISR api is most appropriate for use.

SPI slave is usually implementing custom protocol, where number of transferred bytes depends on payload (command) sent, most of such processing should be done directly in the ISR.

Regards

Daniel

topic LPSPI FreeRTOS Initialization Only for Master? in MCUXpresso SDK

LPSPI FreeRTOS Initialization Only for Master?

Re: LPSPI FreeRTOS Initialization Only for Master?