[riot-notifications] [RIOT-OS/RIOT] drivers/sx127x: optimize power consumption on nss pin (#11384)

Francisco notifications at github.com
Thu May 2 15:56:52 CEST 2019

@aabadie I looked into this again... I came to the conclusion the reason we were seeing the excessive power consumption was because of the X-NUCLEO-LPM01A. I connected a multi-meter directly between the NSS_PIN and the board and I get  0uA of current draw (same for all I/O pins going to sx1276), and the amount of current going directly into the sx1276 chip threw VDD is around 9uA.

I still think NSS_PIN should be initialized as PP_PU but we don't currently have that option in RIOT, I think it would good to add.

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