This patch resolves to bugs in the GPIO interrupt logic:
1. Any pins did not have STMPE811_GPIO_RISING in their pincfg
would clear the rising edge interrupt enable flag for all
pins due to a masking bug.
2. Pins would never trigger a second interrupt. There is an
undocumented requirement that you have to clear both the
GPIO interrupt status register __and__ also the edge
detection status register. Failure to clear either of
these will result in no further interrupts being triggered.
This requirement exists both for edge and level modes of
operation.
Signed-off-by: Brennan Ashton <bashton@brennanashton.com>
Squashed commit of the following:
Change all calls to usleep() in the OS proper to calls to nxsig_usleep()
sched/signal: Add a new OS internal function nxsig_usleep() that is functionally equivalent to usleep() but does not cause a cancellaption point and does not modify the errno variable.
sched/signal: Add a new OS internal function nxsig_sleep() that is functionally equivalent to sleep() but does not cause a cancellaption point.
libc/semaphore: Add nxsem_getvalue() which is identical to sem_getvalue() except that it never modifies the errno variable. Changed all references to sem_getvalue in the OS to nxsem_getvalue().
sched/semaphore: Rename all internal private functions from sem_xyz to nxsem_xyz. The sem_ prefix is (will be) reserved only for the application semaphore interfaces.
libc/semaphore: Add nxsem_init() which is identical to sem_init() except that it never modifies the errno variable. Changed all references to sem_init in the OS to nxsem_init().
sched/semaphore: Rename sem_tickwait() to nxsem_tickwait() so that it is clear this is an internal OS function.
sched/semaphoate: Rename sem_reset() to nxsem_reset() so that it is clear this is an internal OS function.
