Thanks - I do realise the pi & raspian is not 'real time' and I will get glitches - which I am observing, exactly as you say, when log files are written mostly. My hardware responds to pulsed signals and has a time constant of around 20 pulses before it flips state, so the idea is to smooth out the glitches with the hardware slow response. The reason to pulse the output of the micro is to do my best to make sure the hardware does not crash in a logic high state which would destroy the things its controlling within a few seconds (mainly a marine reef tank chemical addition pumps). The use of pulses which are converted in hardware to on / off controls seems to me to greatly reduce the chance of a software caused 'fail to on state' (thats the idea anyway!). My hardware requires a specific frequency for several pulses before it will turn on - higher or lower frequency will not cause the change.

Im really interested in the PIC approach but have zero experience with it - I had to look up what a AVR is - I guess youre implying that its real time capable which is interesting. But the gear and work involved in starting out seems significant whereas the pi and linux is comfortable territory for me hence the current project. But I might spend a bit of time today looking into the most simple way to start out in that area with the most basic setup.

Thanks, Pete

In reply to Re^2: Device::BCM2835, hardware access on a pi, SIGSEGV by Peterpion
in thread Device::BCM2835, hardware access on a pi, SIGSEGV by Peterpion

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