I tested a CCARDWMX28 with aadk-1.4.0.5 and works fine using the AUART2.
The default images have enabled the AUART2(TTL) and works fine with the SerialConsole app using the node /dev/ttySP2.
I’ve configured and rebuilt default android kernel from sources in aadk 1.4:
Here are the ports that are enabled by default:
I have enabled AUART4. SSP3 seems to be disabled by default. AUART1 conflicts with LCD so I have not enabled it. With the new kernel both SerialConsole and SerialPort_1.1.apk work with /dev/ttySP4 – it has DB-9 port so it is very easy to test.
If you boot a ccardmx28 with a kernel that supports the AUART4 you have the following rights:
/ # ls -la /dev/ttySP*
crw-rw---- bluetooth bluetooth 242, 0 1970-01-02 00:05 ttySP0
crwxrwxrwx root root 242, 2 1970-01-02 00:04 ttySP2
crw------- root root 242, 4 1970-01-02 00:04 ttySP4
|
Then if you modify it to 777:
/ # chmod 777 /dev/ttySP4
/ # ls -la /dev/ttySP*
crw-rw---- bluetooth bluetooth 242, 0 1970-01-02 00:05 ttySP0
crwxrwxrwx root root 242, 2 1970-01-02 00:04 ttySP2
crwxrwxrwx root root 242, 4 1970-01-02 00:04 ttySP4
|
and start the Serial Console app, you will see both serial ports:
By default the node /dev/ttySP4 is not included in the list of serial ports permissions.
This process is done in the file ueventd.ccardimx28js.rc:
/dev/ttySP0 0600 bluetooth bluetooth
/dev/pmem_gpu 0660 system graphics
/dev/snd/* 0664 system audio
/dev/ttyUSB* 0640 radio radio
/dev/ttyACM* 0640 radio radio
/dev/video0 0660 system camera
/dev/video16 0660 system graphics
/dev/mxs_pxp 0666 system graphics
/dev/mxs_viim 0664 system media
/dev/fsl_cache 0666 system graphics
/dev/gsl_kmod 0666 system graphics
/dev/uinput 0666 system input
/dev/ttySP1 0775 system gps
/dev/ttya0 0775 system gps
/dev/ptya0 0775 system gps
/dev/ttya1 0775 system gps
/dev/ptya1 0775 system gps
/dev/mmcblk 0664 root root
/dev/spidev* 0777 root root
/dev/i2c* 0777 root root
# Serial ports permissions (needed by Java Serial API)
/dev/ttySP1 0777 root root
/dev/ttySP2 0777 root root
/dev/ttySP3 0777 root root
# sysfs properties
/sys/devices/virtual/input/input* name 0660 root input
/sys/devices/virtual/input/input* max 0660 root input
/sys/devices/virtual/input/input* min 0660 root input
/sys/devices/virtual/input/input* poll 0660 root input
# /sys/devices/platform/mxsdhci.2/mmc_host/mmc0/mmc0:000* boot_bus_config 0660 root root
# /sys/devices/platform/mxsdhci.2/mmc_host/mmc0/mmc0:000* boot_config 0660 root root
# /sys/devices/platform/imx-i2c.2/i2c-2/2-0044 mode 0660 system system
# /sys/devices/platform/imx-i2c.2/i2c-2/2-0044 lux 0660 system system
# /sys/devices/platform/imx-i2c.2/i2c-2/2-0044 int_lt_lux 0660 system system
# /sys/devices/platform/imx-i2c.2/i2c-2/2-0044 int_ht_lux 0660 system system
# /sys/devices/platform/imx-i2c.1/i2c-1/1-000e enable 0660 system input
# /sys/devices/platform/mxs-i2c.0/i2c-0/0-000a enable 0660 system input
# /sys/devices/platform/mxc_sdc_fb.0/graphics/fb* fsl_disp_property 0660 system graphics
# /sys/devices/platform/mxs-fb.0/graphics/fb* mode 0660 system graphics
# /sys/devices/platform/mxc_sdc_fb.1/graphics/fb* fsl_disp_property 0660 system graphics
# /sys/devices/platform/mxc_sdc_fb.0/graphics/fb* mode 0660 system graphics
# /sys/devices/platform/mxc_sdc_fb.1/graphics/fb* mode 0660 system graphics
# /sys/devices/platform/mxc_dvfs_core.0 enable 0660 system system
# /sys/devices/platform/busfreq.0 enable 0660 system system |
If you add the node /dev/ttySP4 to this list:
/ # busybox vi ueventd.ccardimx28js.rc
[...]
# Serial ports permissions (needed by Java Serial API)
/dev/ttySP1 0777 root root
/dev/ttySP2 0777 root root
/dev/ttySP3 0777 root root
/dev/ttySP4 0777 root root
|
And finally reboot your device, in the next boot when you start the Serial Console app you will see the node /dev/ttySP4.
Notice that this application save the list of the serial ports, then if you can not see the serial port /dev/ttySP4 you must to stop the app and clear the cache for this application from the settings menu (Settings -> Apps -> Serial Console -> “Force Stop” and “Clear data”.
Last updated:
Oct 17, 2024