MCP7940.adjust() freezing in main loop about mcp7940 HOT 5 CLOSED

Let me dig up a MCP7940 to see if I can reproduce the problem. Which MCP are you using and on which Arduino processor (perhaps that might play a role in causing the problem).

from mcp7940.

Hi,

I'm using an Arduino Micro so 32U4 processor and an MCP7940N RTC.
My application also uses interrupts in the main loop to read a data line
and I was wondering if that might be part of the problem.

Thanks for having a look at this.

Stuart

from mcp7940.

I've got both of those (the Micro and MCP7940N) and will check it tonight. Any time when one programs with interrupts and experiences "hangs" there is a good chance that it is due to that. You might try to use the LED to show that the interrupt is being fired "(digital.write(!digital.read(13));" or use the LED in the MCP7940.adjust() code.
I do seem to remember that I had some issues with the adjust() but can't remember if it was hanging or invalid values.

from mcp7940.

Hi,
Before you spend any more time on this, I think the freezing problem is solved.
Although I claimed the adjust() was being called in the main loop, it was actually being called
at the end of an ISR used to detect the last button press of a time/date set menu function.
Of course an ISR isn't the place for this call, and it now seems to work using a flag so that
the function invoked back the main loop to set the time/date on the 7940.
Will do some more testing but I think it's now ok.
thanks for your help.

from mcp7940.

I've got a non-Micro Arduino setup with the MCP7940N and used multiple calls to adjust() with no problems, so I think that you've most likely found the problem. I'll close this issue but don't hesitate to open a new one if necessary.

from mcp7940.