Webts2phc.pulsewidth. The expected pulse width of the external PPS signal in nanoseconds. When ts2phc.extts_polarity is both, the given pulse width is used to detect and discard the … WebRETURN VALUE On success, poll() returns a nonnegative value which is the number of elements in the pollfds whose revents fields have been set to a nonzero value (indicating an event or an error). A return value of zero indicates that the system call timed out before any file descriptors became read.
GPIO Sysfs Interrupt using Poll not Working - Processors forum ...
WebSep 21, 2024 · The extts events increment normally. The source timestamp jumps 1.907774278 seconds, then 0.195537082 seconds. That is the problem. The source timestamps are produced by this code: /* * Returns the time on the PPS source device at which the most recent * PPS event was generated. WebOct 30, 2024 · This data structure can be created, modified and deleted by three system calls. 1) epoll_create. The epoll instance is created by means of the epoll_create system call, which returns a file descriptor to the epoll instance. The signature of epoll_create is as follows:. #include int epoll_create(int size); The size argument is an … literary encyclopedia online
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WebIf the value of fd/msgid is less than 0, events is ignored and revents is set to 0 in that entry on return from poll(). In each pollfd structure, poll() clears the revents member except that where the application requested a report on a condition by setting one of the bits of events listed above, poll() sets the corresponding bit in revents if the requested condition is true. WebHi, I'm trying to get GPIO Interrrupt functionality working using sysfs and poll calls. The problem appears to be that the poll call is always returnng immediately and is not triggering on the actualy rising edge. I have configured the kernel for this GPIO to be an input which does work correctly. I've also configured the GPIO (114) correctly ... WebDec 23, 2024 · If timeout is greater than zero, it specifies a maximum interval (in milliseconds) to wait for any file descriptor to become ready. If timeout is zero, then poll () will return without blocking. If the value of timeout is -1, the poll blocks indefinitely. Maximum interval to wait for the poll to complete, in milliseconds. If this value is 0 ... literary element theme definition