Difference between revisions of "FAQ:fitlet2"
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(→I can see an additional COM port in the device manager, where is it physically?) (change visibility) |
(→I can see an additional COM port in the device manager, where is it physically?) (change visibility) |
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*fitlet2 comes with a single RS232 ultra-mini com port (COM1) | *fitlet2 comes with a single RS232 ultra-mini com port (COM1) | ||
| − | *There is another COM ports inside the chassis ( | + | *There is another COM ports inside the chassis (COM2) for the use of developing additional FACET cards. |
*That additional COM port is no accessible externally whatsoever. | *That additional COM port is no accessible externally whatsoever. | ||
Revision as of 13:52, 21 March 2018
Contents
General
Hardware
How to control fitlet2 front LEDs?
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
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.
- That additional COM port is no accessible externally whatsoever.
