Sp0T Posted May 13, 2017 Share Posted May 13, 2017 Dear All, I try to use the UART3 on my Orange Pi mini but it just won't work. I put a jumper on Pin 8 and pin 10 on the header. Also give read/write premmission to all users. Based on this UART3 is /dev/ttyS2 [ 0.000000] console [tty1] enabled [ 0.954713] sunxi-uart.0: ttyS0 at MMIO 0x1c28000 (irq = 33) is a U6_16550A [ 0.985810] sunxi-uart.2: ttyS1 at MMIO 0x1c28800 (irq = 35) is a U6_16550A [ 1.016890] sunxi-uart.3: ttyS2 at MMIO 0x1c28c00 (irq = 36) is a U6_16550A [ 1.047968] sunxi-uart.7: ttyS3 at MMIO 0x1c29c00 (irq = 52) is a U6_16550A [ 6.014770] systemd[1]: Expecting device dev-ttySAC2.device... [ 6.681738] systemd[1]: Starting system-serial\x2dgetty.slice. [ 6.690398] systemd[1]: Created slice system-serial\x2dgetty.slice. [ 6.695167] systemd[1]: Starting system-getty.slice. [ 6.702124] systemd[1]: Created slice system-getty.slice. I Also checked the speed and other config settings: root@orange:~# stty -F /dev/ttyS2 speed 115200 baud; line = 0; kill = ^H; min = 100; time = 2; -icrnl -imaxbel -opost -onlcr -isig -icanon -echo When i try to send/receive some data i always failed, nothing happend. console 1: echo -ne '\033[2J' > /dev/ttyS2 console2: cat -v < /dev/ttyS2 Can anyone tell me what did i wrong? Thanks Sp0T Link to comment Share on other sites More sharing options...
Sp0T Posted May 13, 2017 Author Share Posted May 13, 2017 Dear All, It was my bad. Forget to remove pins from gpio. Regards, Sp0T Link to comment Share on other sites More sharing options...
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