Hi! I'm trying to write a spi driver with RTDM but I've read in at least a couple places that spi_sync can't be used with rt tasks. That definitely makes sense to me, but I was wondering if I could use spi_async. I don't particularly care about the latency or jitter of the spi operation as long as it actually occurs every period.
My idea was to protect the spi system with an rtdm_mutex_t by locking it when it is created, and unlocking it once the spi driver is probed. The task attempts to lock the mutex without a timeout and schedules a transfer with spi_async, or just waits another period if it can't (Other more important things happen in the task, missing spi isn't a show-stopper). Then the spi callback unlocks the mutex. This should prevent the real time task from muking with spi while the kernel is working with it right? Or am I missing something else? Thanks, -Jon Wallace _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
