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Mon May 11 12:09:17 EDT 2020

Writing out a number of gpio bits at once

See RM 9.2 GPIO registers

9.2.4 Port output data register GPIOx_ODR

9.2.5 Port bit set/reset register GPIOx_BSRR

The first one is direct write to all the port bits, the latter is
slective set/reset.





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