Hi all,
This is first time I am using Beaglebone black for a development.
I am using Beaglebone Black RevC with Debian Jessie image.
I want an application “shaft_cam” to run at bootup of BBB.
For that I created a .service file in /lib/systemd/system/ folder.
[Unit]
Description=Shaft Cam
[Service]
WorkingDirectory=/root/
ExecStart=/root/./start.sh
SyslogIdentifier=shaft_cam
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
And my start.sh contains the following
#!/bin/bash
#sudo su -c “echo BB-UART4 > /sys/devices/platform/bone_capemgr/slots”
#sudo sh -c “echo BB-I2C1 > /sys/devices/platform/bone_capemgr/slots”
echo 44 > /sys/class/gpio/export
echo 45 > /sys/class/gpio/export
echo 23 > /sys/class/gpio/export
echo 26 > /sys/class/gpio/export
echo 47 > /sys/class/gpio/export
echo 46 > /sys/class/gpio/export
echo 27 > /sys/class/gpio/export
echo 65 > /sys/class/gpio/export
echo 22 > /sys/class/gpio/export
echo 49 > /sys/class/gpio/export
/root/./shaft_cam
So in my start.sh, adding BB-UART4 overlay is done, before calling shaft_cam.
But after restart shaft_cam is executed, but UART4 is not working.
But at the same time when I examine the folder /sys/devices/platform/bone_capemgr/, slot-4 (for BB-UART4) and slot-5(BB-I2C1) exists there.
This is happening at every power up.
That is the shaft_cam which includes UART4 operation is running(as indicated by LEDs), but UART4 operation is not happening.
After booting is completed, if I kill shaft_cam, and run it in one terminal with the command ./shaft_cam, everything is working (without any other changes).
After restart only UART4 operations are not working. Stopping it and invoking from a terminal everything including UART4 operations are working.
When I captured bootup messages through Putty, I observed the following (the messages are given in the attached file BOOTUP MESSAGE.docx )
BB-UART4 capemgr is executed after shaft_cam (as seen in BOOTUP MESSAGE.docx)
Whether UART4 is not working at bootup because of this ?
If so how can I make capemgr executed before shaft_cam ?
Thanks & Regards,
Sajeevan.K
BOOTUP MESSAGE.docx (76.1 KB)