drivers/periph_common: added spi_transfer_byte()
drivers/periph_common: added spi_transfer_byte()

hamilton-mote/RIOT-OS,ant9000/RIOT,x3ro/RIOT,cladmi/RIOT,gebart/RIOT,A-Paul/RIOT,TobiasFredersdorf/RIOT,smlng/RIOT,kerneltask/RIOT,A-Paul/RIOT,LudwigKnuepfer/RIOT,neumodisch/RIOT,tfar/RIOT,lazytech-org/RIOT,LudwigOrtmann/RIOT,Ell-i/RIOT,jfischer-phytec-iot/RIOT,jasonatran/RIOT,kaspar030/RIOT,LudwigOrtmann/RIOT,gebart/RIOT,Hyungsin/RIOT-OS,kb2ma/RIOT,mtausig/RIOT,tfar/RIOT,miri64/RIOT,syin2/RIOT,OlegHahm/RIOT,immesys/RiSyn,lazytech-org/RIOT,rfuentess/RIOT,cladmi/RIOT,syin2/RIOT,jbeyerstedt/RIOT-OTA-update,backenklee/RIOT,adrianghc/RIOT,authmillenon/RIOT,jbeyerstedt/RIOT-OTA-update,adrianghc/RIOT,kaleb-himes/RIOT,BytesGalore/RIOT,jasonatran/RIOT,aeneby/RIOT,x3ro/RIOT,OlegHahm/RIOT,basilfx/RIOT,beurdouche/RIOT,kaleb-himes/RIOT,ant9000/RIOT,BytesGalore/RIOT,kb2ma/RIOT,adjih/RIOT,Ell-i/RIOT,adjih/RIOT,miri64/RIOT,OlegHahm/RIOT,LudwigKnuepfer/RIOT,authmillenon/RIOT,thomaseichinger/RIOT,jasonatran/RIOT,jasonatran/RIOT,alignan/RIOT,x3ro/RIOT,basilfx/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,plushvoxel/RIOT,TobiasFredersdorf/RIOT,kaleb-himes/RIOT,neiljay/RIOT,lazytech-org/RIOT,aeneby/RIOT,gautric/RIOT,biboc/RIOT,jfischer-phytec-iot/RIOT,adrianghc/RIOT,basilfx/RIOT,Josar/RIOT,authmillenon/RIOT,dkm/RIOT,jfischer-phytec-iot/RIOT,rfuentess/RIOT,thomaseichinger/RIOT,beurdouche/RIOT,katezilla/RIOT,mfrey/RIOT,kaleb-himes/RIOT,Josar/RIOT,smlng/RIOT,jbeyerstedt/RIOT-OTA-update,LudwigKnuepfer/RIOT,lazytech-org/RIOT,biboc/RIOT,miri64/RIOT,kbumsik/RIOT,mfrey/RIOT,neumodisch/RIOT,thomaseichinger/RIOT,yogo1212/RIOT,OTAkeys/RIOT,mtausig/RIOT,hamilton-mote/RIOT-OS,RIOT-OS/RIOT,katezilla/RIOT,hamilton-mote/RIOT-OS,smlng/RIOT,neiljay/RIOT,backenklee/RIOT,josephnoir/RIOT,gebart/RIOT,neiljay/RIOT,dailab/RIOT,avmelnikoff/RIOT,ks156/RIOT,ant9000/RIOT,gautric/RIOT,gebart/RIOT,A-Paul/RIOT,adrianghc/RIOT,Ell-i/RIOT,beurdouche/RIOT,kaleb-himes/RIOT,avmelnikoff/RIOT,kbumsik/RIOT,cladmi/RIOT,dailab/RIOT,kYc0o/RIOT,katezilla/RIOT,toonst/RIOT,Ell-i/RIOT,authmillenon/RIOT,OTAkeys/RIOT,kYc0o/RIOT,cladmi/RIOT,A-Paul/RIOT,cladmi/RIOT,adrianghc/RIOT,ant9000/RIOT,tfar/RIOT,roberthartung/RIOT,kb2ma/RIOT,jfischer-phytec-iot/RIOT,kaspar030/RIOT,kaspar030/RIOT,rfuentess/RIOT,dkm/RIOT,mtausig/RIOT,LudwigOrtmann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,biboc/RIOT,OTAkeys/RIOT,immesys/RiSyn,RIOT-OS/RIOT,plushvoxel/RIOT,authmillenon/RIOT,kb2ma/RIOT,syin2/RIOT,hamilton-mote/RIOT-OS,adjih/RIOT,thomaseichinger/RIOT,toonst/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,plushvoxel/RIOT,aeneby/RIOT,kbumsik/RIOT,backenklee/RIOT,aeneby/RIOT,LudwigOrtmann/RIOT,immesys/RiSyn,LudwigKnuepfer/RIOT,kb2ma/RIOT,LudwigOrtmann/RIOT,gebart/RIOT,kerneltask/RIOT,alignan/RIOT,rfuentess/RIOT,toonst/RIOT,neumodisch/RIOT,kYc0o/RIOT,Josar/RIOT,smlng/RIOT,plushvoxel/RIOT,jfischer-phytec-iot/RIOT,Hyungsin/RIOT-OS,mfrey/RIOT,roberthartung/RIOT,Hyungsin/RIOT-OS,LudwigOrtmann/RIOT,OlegHahm/RIOT,mfrey/RIOT,kaspar030/RIOT,backenklee/RIOT,tfar/RIOT,avmelnikoff/RIOT,OTAkeys/RIOT,backenklee/RIOT,rfuentess/RIOT,dailab/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,beurdouche/RIOT,neiljay/RIOT,basilfx/RIOT,basilfx/RIOT,kbumsik/RIOT,neiljay/RIOT,josephnoir/RIOT,dailab/RIOT,immesys/RiSyn,yogo1212/RIOT,Josar/RIOT,avmelnikoff/RIOT,immesys/RiSyn,josephnoir/RIOT,roberthartung/RIOT,ks156/RIOT,dkm/RIOT,syin2/RIOT,BytesGalore/RIOT,gautric/RIOT,x3ro/RIOT,josephnoir/RIOT,kbumsik/RIOT,toonst/RIOT,ant9000/RIOT,gautric/RIOT,alignan/RIOT,katezilla/RIOT,Josar/RIOT,TobiasFredersdorf/RIOT,josephnoir/RIOT,Hyungsin/RIOT-OS,avmelnikoff/RIOT,jasonatran/RIOT,alignan/RIOT,BytesGalore/RIOT,Ell-i/RIOT,kerneltask/RIOT,biboc/RIOT,alignan/RIOT,neumodisch/RIOT,katezilla/RIOT,OTAkeys/RIOT,roberthartung/RIOT,jbeyerstedt/RIOT-OTA-update,LudwigKnuepfer/RIOT,x3ro/RIOT,aeneby/RIOT,beurdouche/RIOT,Hyungsin/RIOT-OS,yogo1212/RIOT,RIOT-OS/RIOT,thomaseichinger/RIOT,lazytech-org/RIOT,immesys/RiSyn,tfar/RIOT,TobiasFredersdorf/RIOT,mtausig/RIOT,dailab/RIOT,TobiasFredersdorf/RIOT,neumodisch/RIOT,miri64/RIOT,dkm/RIOT,syin2/RIOT,dkm/RIOT,yogo1212/RIOT,ks156/RIOT,kYc0o/RIOT,mtausig/RIOT,jbeyerstedt/RIOT-OTA-update,neumodisch/RIOT,plushvoxel/RIOT,adjih/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,ks156/RIOT,RIOT-OS/RIOT,kerneltask/RIOT,smlng/RIOT,BytesGalore/RIOT,authmillenon/RIOT,kerneltask/RIOT,biboc/RIOT,mfrey/RIOT,kYc0o/RIOT,kaspar030/RIOT,gautric/RIOT,A-Paul/RIOT,yogo1212/RIOT,hamilton-mote/RIOT-OS,yogo1212/RIOT,roberthartung/RIOT,toonst/RIOT,RIOT-OS/RIOT,miri64/RIOT,ks156/RIOT,OlegHahm/RIOT,adjih/RIOT