FAQ:fitlet2
Contents
- 1 General
- 2 Hardware
- 2.1 How to control fitlet2 front LEDs?
- 2.2 How do you I configure my cellular modem on Linux?
- 2.3 I can see an additional COM port in the device manager, where is it physically?
- 2.4 What is the DC input voltage tolerance for the fitlet2?
- 2.5 What is the fitlet2's RTC backup battery Accuracy and lifetime?
- 3 Software
General
Hardware
How to control fitlet2 front LEDs?
For Linux
fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately.
In Linux kernel there are 4 related GPIOs: GPIO435, GPIO436, GPIO437, GPIO438.
- GPIO435 - LED1 GREEN
- GPIO436 - LED1 YELLOW
- GPIO437 - LED2 GREEN
- GPIO438 - LED2 YELLOW
To control the GPIOs need to login as root (root password required):
$ su Password:
To control for example LED1 GREEN part:
$ echo 435 > /sys/class/gpio/export $ echo out > /sys/class/gpio/gpio435/direction $ echo 1 > /sys/class/gpio/gpio435/value # LED1 should be GREEN now $ echo 0 > /sys/class/gpio/gpio435/value # LED1 should be OFF now $ echo 435 > /sys/class/gpio/unexport
The GPIO framework and GPIO sysfs interface are documented in https://www.kernel.org/doc/Documentation/gpio/gpio.txt
How do you I configure my cellular modem on Linux?
- Please refer to the guide - Linux Mint: Mobile broadband
For Windows
TBD
I can see an additional COM port in the device manager, where is it physically?
- fitlet2 comes with a single RS232 ultra-mini com port (COM1)
- There is another COM ports inside the chassis (COM2) for the use of developing additional FACET cards.
- The additional COM port is not accessible externally
What is the DC input voltage tolerance for the fitlet2?
The fitlet2 model can work at a wide DC input voltage range of 9V-20V.
This range can also be extended to 9V-36V if the model is configured with the P36 option.
What is the fitlet2's RTC backup battery Accuracy and lifetime?
- RTC accuracy – less than 1 sec per day
- A lifetime of the RTC battery backup is 5 years, depend on the use case of the customer.
Software
FreeBSD is not working, what can I do?
There are necessary configuration changes that should be made in order to have FreeBSD work on fitlet2
Press [Del] during boot to enter BIOS settings:
Set Chipset -> OS Selection to [Intel Linux] Set Chipset -> SCC Configuration -> SCC SD Card Support (D27: F0) to [Disable] Set Chipset -> SCC Configuration -> SCC eMMC Support (D28: F0) to [Disable] Set Chipset -> SCC Configuration -> SCC UFS Support (D29: F0) to [Disable] Set Chipset -> SCC Configuration -> SCC SDIO Support (D30: F0) to [Disable]
How to identify the COM port on Linux ?
Please refer to the link- Linux Mint: Serial port on fitlet2