[riot-notifications] [RIOT-OS/RIOT] samd21:uart TXC test backwards (#7617)

Travis Griggs notifications at github.com
Thu Sep 21 18:42:44 CEST 2017

> I'm unsure if it can be removed as an alternative solution

Given that it does not do what was intended, it was already effectively removed. But I take your point, that if its needed, we should implement it. But so far, the installed base has anecdotally indicated its not needed, by getting by without it implemented properly.

I did look at the L21's data sheet, it uses the same verbiage, which leads me to believe that the *sole* condition for writing to the UART is checking DRE first. I'm not sure how many data sheets to troll through before feeling the understood behavior is ubiquituous.

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