Hello,
I'm using ubuntu 14.04.2.
I'm trying to use UART with Adafruit library
When i execute:
*UART.setup("UART4")*
I detect this error with all the uarts:
*RuntimeError: Unable to export UART channel.*
this is the print of: *dmesg | grep tty*
[ 0.000000] Kernel command line: console=ttyO0,115200n8 quiet
drm.debug=7 cap
emgr.enable_partno=BB-UART1,BB-UART2,BB-UART4
root=UUID=854463c0-6305-4e7b-b9e7-
d2edbfa8b232 ro
rootfstype=ext4 rootwait fixrtc quiet
[ 0.000426] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[ 2.654234] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 88,
base_baud =
3000000) is a 8250
[ 2.671940] console [ttyS0] enabled
[ 2.673157] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 89,
base_baud =
3000000) is a 8250
[ 2.674056] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 90,
base_baud =
3000000) is a 8250
[ 2.674871] 481a8000.serial: ttyS4 at MMIO 0x481a8000 (irq = 61,
base_baud =
3000000) is a 8250
[ 2.675645] 481aa000.serial: ttyS5 at MMIO 0x481aa000 (irq = 62,
base_baud =
3000000) is a 8250
ant this is the print of *ls -l /dev/tty**
crw-rw---- 1 1 root root 5 May 14 15:19 /dev/ttyO0 -> ttyS0
crw-rw---- 1 1 root root 5 May 14 15:19 /dev/ttyO1 -> ttyS1
crw-rw---- 1 1 root root 5 May 14 15:19 /dev/ttyO2 -> ttyS2
crw-rw---- 1 1 root root 5 May 14 15:19 /dev/ttyO4 -> ttyS4
crw-rw---- 1 1 root root 5 May 14 15:19 /dev/ttyO5 -> ttyS5
crw-rw---- 1 root tty 4, 64 May 14 15:20 /dev/ttyS0
crw-rw---- 1 root dialout 4, 65 May 14 15:19 /dev/ttyS1
crw-rw---- 1 root dialout 4, 66 May 14 15:19 /dev/ttyS2
crw-rw---- 1 root dialout 4, 67 May 14 15:19 /dev/ttyS3
crw-rw---- 1 root dialout 4, 68 May 14 15:19 /dev/ttyS4
crw-rw---- 1 root dialout 4, 69 May 14 15:19 /dev/ttyS5
crw-rw---- 1 root dialout 4, 70 May 14 15:19 /dev/ttyS6
crw-rw---- 1 root dialout 4, 71 May 14 15:19 /dev/ttyS7
crw-rw---- 1 root dialout 4, 72 May 14 15:19 /dev/ttyS8
crw-rw---- 1 root dialout 4, 73 May 14 15:19 /dev/ttyS9
*This is my uEnv.txt:*
#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0
uname_r=3.14.37-ti-r57
#dtb=
cmdline=quiet
#In the event of edid real failures, uncomment this next line:
#cmdline=quiet video=HDMI-A-1:1024x768@60e
##Example
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=
##enable BBB: eMMC Flasher:
#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh
uuid=854463c0-6305-4e7b-b9e7-d2edbfa8b232
optargs=quiet drm.debug=7 capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART4
Thank you,
Best regards
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