[riot-notifications] [RIOT-OS/RIOT] E-paper driver samr21 using spi (#11756)

Dylan Laduranty notifications at github.com
Tue Jul 2 22:16:44 CEST 2019

`spi_acquire()` must be call before any spi transaction. There is no need to call    `gpio_write(dc,0);` several times.
I also don't think your commands are right. You are sending the register you want to write but without any data...

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