# How can I use floating point math in an interrupt routine without ignoring serial port ints..RCM4120?

**URL:** <https://forums.digi.com/t/how-can-i-use-floating-point-math-in-an-interrupt-routine-without-ignoring-serial-port-ints-rcm4120/12654>\
**Category:** Rabbit Software\
**Tags:** rcm4120-dynamicc10, 56\
**Created:** [March 11, 2014, 10:42am UTC](https://forums.digi.com/t/how-can-i-use-floating-point-math-in-an-interrupt-routine-without-ignoring-serial-port-ints-rcm4120/12654 "2014-03-11T10:42:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jdm11](https://avatars.discourse-cdn.com/v4/letter/j/e36b37/32.png) [@jdm11](https://forums.digi.com/u/jdm11)\
**Post date:** [March 11, 2014, 10:42am UTC](https://forums.digi.com/t/how-can-i-use-floating-point-math-in-an-interrupt-routine-without-ignoring-serial-port-ints-rcm4120/12654/1 "2014-03-11T10:42:21Z")

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**Author:** ![jdm11](https://avatars.discourse-cdn.com/v4/letter/j/e36b37/32.png) [@jdm11](https://forums.digi.com/u/jdm11)\
**Post date:** [March 12, 2014, 4:15pm UTC](https://forums.digi.com/t/how-can-i-use-floating-point-math-in-an-interrupt-routine-without-ignoring-serial-port-ints-rcm4120/12654/2 "2014-03-12T16:15:24Z")

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It was a priority issue…too much time in the interrupt with too hign a priority. all set.