Hello all, Some time ago I made a library for the clock IC DS3231. This library is part of Jallib release 1.7.0.
This IC has an I2C interface and is capable of handling two alarms. When an alarm is activated an interrupt is generated. Reading the alarm flag from the IC also uses - of course- the I2C interface but the I2C interface is also used by the main program. I thought that if I would disable all interrupts when calling the I2C routines from the main program and only enable it while not used by the main program that I could call the same I2C routines from the interrupt routine and so be able to read the alarm flag from the IC to see if alarm 1 or alarm 2 was activated. Unfortunately this did not work. I thought that when an interrupt is called some info is saved and after the interrupt restored but I also thought that I could then call any routine from the interrupt as long that I am certain that no I2C transfer was active (which should be since the interrupt is disabled when the main program is using the I2C routines). Any ideas why this does not work? Am I missing something? What the current sample program does is just setting a global flag in the interrupt routine and the main program polls this flag and then reads the alarm flag of the IC via I2C but this undermines a bit the use of the interrupt. Thanks. Kind regards, Rob -- You received this message because you are subscribed to the Google Groups "jallib" group. To unsubscribe from this group and stop receiving emails from it, send an email to jallib+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jallib/ff12f63c-0d1d-4897-8ca4-511869ab68c0n%40googlegroups.com.
