# FastLED on SWAN

**URL:** <https://discuss.blues.com/t/fastled-on-swan/564>\
**Category:** Tools & SDKs\
**Created:** [December 17, 2021, 4:34pm UTC](https://discuss.blues.com/t/fastled-on-swan/564 "2021-12-17T16:34:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jherr](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/jherr/32/327_2.png) [@jherr](https://discuss.blues.com/u/jherr)\
**Post date:** [December 17, 2021, 4:34pm UTC](https://discuss.blues.com/t/fastled-on-swan/564/1 "2021-12-17T16:34:19Z")

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I’m trying to use the FastLED library with the SWAN board and it appears that it’s not one of the pre-defined STM32 configurations. It does have configurations for STM32F10X\_MD and **STM32F1**. It looks like I could just add the constant for STM32L4R5, but that appears to not be defined. I’ve tried a few variations; STM32L4, **STM32L4** , STM32L4R5, **STM32L4R5** and nothing seems to be defined. Is it possible to see what global definitions are defined for the SWAN?

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**Author:** ![zfields](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/zfields/32/29_2.png) [@zfields](https://discuss.blues.com/u/zfields)\
**Post date:** [December 17, 2021, 5:14pm UTC](https://discuss.blues.com/t/fastled-on-swan/564/2 "2021-12-17T17:14:12Z")

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I’m unfamiliar with the FastLED library, but a cursory search showed it to be an Arduino library.

If I’m correct, and you are using Arduino, then you can use the very general `ARDUINO_ARCH_STM32` or the very narrow `SWAN_R5` constants to identify the Swan.

~Zak