cpu/atmega2560: reworked UART implementation
cpu/atmega2560: reworked UART implementation

OlegHahm/RIOT,altairpearl/RIOT,LudwigOrtmann/RIOT,lazytech-org/RIOT,d00616/RIOT,thomaseichinger/RIOT,LudwigKnuepfer/RIOT,basilfx/RIOT,kaspar030/RIOT,immesys/RiSyn,rfuentess/RIOT,ks156/RIOT,mfrey/RIOT,BytesGalore/RIOT,altairpearl/RIOT,wentaoshang/RIOT,kaspar030/RIOT,backenklee/RIOT,ks156/RIOT,adrianghc/RIOT,yogo1212/RIOT,kb2ma/RIOT,OlegHahm/RIOT,d00616/RIOT,kYc0o/RIOT,roberthartung/RIOT,kbumsik/RIOT,jfischer-phytec-iot/RIOT,authmillenon/RIOT,Hyungsin/RIOT-OS,syin2/RIOT,katezilla/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,neiljay/RIOT,lazytech-org/RIOT,kYc0o/RIOT,dkm/RIOT,alignan/RIOT,gebart/RIOT,alignan/RIOT,biboc/RIOT,tfar/RIOT,kaspar030/RIOT,brettswann/RIOT,jasonatran/RIOT,BytesGalore/RIOT,backenklee/RIOT,jasonatran/RIOT,x3ro/RIOT,thomaseichinger/RIOT,kaleb-himes/RIOT,RIOT-OS/RIOT,jremmert-phytec-iot/RIOT,miri64/RIOT,kerneltask/RIOT,wentaoshang/RIOT,katezilla/RIOT,josephnoir/RIOT,cladmi/RIOT,avmelnikoff/RIOT,jremmert-phytec-iot/RIOT,hamilton-mote/RIOT-OS,A-Paul/RIOT,biboc/RIOT,dailab/RIOT,dkm/RIOT,rajma996/RIOT,BytesGalore/RIOT,yogo1212/RIOT,gebart/RIOT,wentaoshang/RIOT,jremmert-phytec-iot/RIOT,jfischer-phytec-iot/RIOT,plushvoxel/RIOT,OlegHahm/RIOT,x3ro/RIOT,Josar/RIOT,gebart/RIOT,Ell-i/RIOT,plushvoxel/RIOT,backenklee/RIOT,d00616/RIOT,miri64/RIOT,OlegHahm/RIOT,kerneltask/RIOT,syin2/RIOT,LudwigKnuepfer/RIOT,rfuentess/RIOT,beurdouche/RIOT,dkm/RIOT,kaleb-himes/RIOT,TobiasFredersdorf/RIOT,tfar/RIOT,Ell-i/RIOT,aeneby/RIOT,rfuentess/RIOT,roberthartung/RIOT,neiljay/RIOT,josephnoir/RIOT,syin2/RIOT,zhuoshuguo/RIOT,kb2ma/RIOT,josephnoir/RIOT,LudwigOrtmann/RIOT,authmillenon/RIOT,ant9000/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,mfrey/RIOT,hamilton-mote/RIOT-OS,mtausig/RIOT,authmillenon/RIOT,yogo1212/RIOT,gebart/RIOT,jasonatran/RIOT,zhuoshuguo/RIOT,thomaseichinger/RIOT,kbumsik/RIOT,smlng/RIOT,Josar/RIOT,basilfx/RIOT,rajma996/RIOT,adrianghc/RIOT,smlng/RIOT,roberthartung/RIOT,toonst/RIOT,katezilla/RIOT,jfischer-phytec-iot/RIOT,LudwigKnuepfer/RIOT,Josar/RIOT,tfar/RIOT,kYc0o/RIOT,zhuoshuguo/RIOT,OTAkeys/RIOT,syin2/RIOT,immesys/RiSyn,neumodisch/RIOT,jbeyerstedt/RIOT-OTA-update,dkm/RIOT,jfischer-phytec-iot/RIOT,cladmi/RIOT,zhuoshuguo/RIOT,kb2ma/RIOT,dailab/RIOT,LudwigKnuepfer/RIOT,hamilton-mote/RIOT-OS,foss-for-synopsys-dwc-arc-processors/RIOT,josephnoir/RIOT,immesys/RiSyn,neumodisch/RIOT,immesys/RiSyn,smlng/RIOT,roberthartung/RIOT,kaleb-himes/RIOT,authmillenon/RIOT,adrianghc/RIOT,RIOT-OS/RIOT,plushvoxel/RIOT,LudwigOrtmann/RIOT,toonst/RIOT,avmelnikoff/RIOT,jbeyerstedt/RIOT-OTA-update,adjih/RIOT,Hyungsin/RIOT-OS,A-Paul/RIOT,RIOT-OS/RIOT,TobiasFredersdorf/RIOT,kerneltask/RIOT,wentaoshang/RIOT,beurdouche/RIOT,basilfx/RIOT,tfar/RIOT,A-Paul/RIOT,adjih/RIOT,aeneby/RIOT,katezilla/RIOT,altairpearl/RIOT,neumodisch/RIOT,d00616/RIOT,toonst/RIOT,neumodisch/RIOT,kaleb-himes/RIOT,kbumsik/RIOT,LudwigOrtmann/RIOT,mfrey/RIOT,A-Paul/RIOT,d00616/RIOT,BytesGalore/RIOT,ant9000/RIOT,kerneltask/RIOT,jbeyerstedt/RIOT-OTA-update,jasonatran/RIOT,wentaoshang/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,TobiasFredersdorf/RIOT,basilfx/RIOT,josephnoir/RIOT,Ell-i/RIOT,aeneby/RIOT,Hyungsin/RIOT-OS,jremmert-phytec-iot/RIOT,smlng/RIOT,mfrey/RIOT,Josar/RIOT,brettswann/RIOT,brettswann/RIOT,OTAkeys/RIOT,adjih/RIOT,biboc/RIOT,TobiasFredersdorf/RIOT,ant9000/RIOT,backenklee/RIOT,kerneltask/RIOT,jremmert-phytec-iot/RIOT,kbumsik/RIOT,kaspar030/RIOT,basilfx/RIOT,brettswann/RIOT,thomaseichinger/RIOT,beurdouche/RIOT,brettswann/RIOT,gautric/RIOT,brettswann/RIOT,rajma996/RIOT,dkm/RIOT,roberthartung/RIOT,neiljay/RIOT,kbumsik/RIOT,beurdouche/RIOT,jremmert-phytec-iot/RIOT,miri64/RIOT,plushvoxel/RIOT,tfar/RIOT,avmelnikoff/RIOT,x3ro/RIOT,yogo1212/RIOT,wentaoshang/RIOT,zhuoshuguo/RIOT,kYc0o/RIOT,x3ro/RIOT,authmillenon/RIOT,katezilla/RIOT,LudwigOrtmann/RIOT,mfrey/RIOT,plushvoxel/RIOT,jasonatran/RIOT,Ell-i/RIOT,biboc/RIOT,cladmi/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,RIOT-OS/RIOT,avmelnikoff/RIOT,thomaseichinger/RIOT,alignan/RIOT,A-Paul/RIOT,Hyungsin/RIOT-OS,adrianghc/RIOT,neiljay/RIOT,cladmi/RIOT,gautric/RIOT,rfuentess/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,neumodisch/RIOT,hamilton-mote/RIOT-OS,mtausig/RIOT,gautric/RIOT,cladmi/RIOT,kYc0o/RIOT,Hyungsin/RIOT-OS,lazytech-org/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,yogo1212/RIOT,rfuentess/RIOT,adjih/RIOT,avmelnikoff/RIOT,zhuoshuguo/RIOT,kb2ma/RIOT,hamilton-mote/RIOT-OS,ks156/RIOT,altairpearl/RIOT,toonst/RIOT,d00616/RIOT,immesys/RiSyn,beurdouche/RIOT,aeneby/RIOT,yogo1212/RIOT,lazytech-org/RIOT,ant9000/RIOT,syin2/RIOT,backenklee/RIOT,altairpearl/RIOT,gebart/RIOT,BytesGalore/RIOT,adrianghc/RIOT,TobiasFredersdorf/RIOT,ant9000/RIOT,kaspar030/RIOT,Ell-i/RIOT,kaleb-himes/RIOT,x3ro/RIOT,smlng/RIOT,mtausig/RIOT,jfischer-phytec-iot/RIOT,rajma996/RIOT,OTAkeys/RIOT,jbeyerstedt/RIOT-OTA-update,neiljay/RIOT,dailab/RIOT,alignan/RIOT,ks156/RIOT,OTAkeys/RIOT,altairpearl/RIOT,miri64/RIOT,Josar/RIOT,lazytech-org/RIOT,alignan/RIOT,dailab/RIOT,ks156/RIOT,rajma996/RIOT,gautric/RIOT,kb2ma/RIOT,biboc/RIOT,adjih/RIOT,miri64/RIOT,OlegHahm/RIOT,dailab/RIOT,jbeyerstedt/RIOT-OTA-update,toonst/RIOT,immesys/RiSyn,mtausig/RIOT,OTAkeys/RIOT,neumodisch/RIOT,gautric/RIOT,aeneby/RIOT,mtausig/RIOT,rajma996/RIOT