Difference between revisions of "IoTGateway/Features/Linux/Peripheral"
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{{DISPLAYTITLE:Linux Peripheral Features}} | {{DISPLAYTITLE:Linux Peripheral Features}} | ||
+ | |||
+ | {| class="wikitable" | ||
+ | |- | ||
+ | ! Feature !! Description | ||
+ | |- | ||
+ | | [[#ADC]] || analogue to digital converters | ||
+ | |- | ||
+ | | Backlight || Enable/read and modify backlight brightness | ||
+ | |- | ||
+ | | Camera || Example | ||
+ | |- | ||
+ | | CAN Bus || CAN subsystem | ||
+ | |- | ||
+ | | CPU Frequency || Example | ||
+ | |- | ||
+ | | Ethernet || Example | ||
+ | |- | ||
+ | | Framebuffer || Example | ||
+ | |- | ||
+ | | GPIO || Example | ||
+ | |- | ||
+ | | I2C || Example | ||
+ | |- | ||
+ | | IR || InfraRed | ||
+ | |- | ||
+ | | One Wire || Example | ||
+ | |- | ||
+ | | RTC || Example | ||
+ | |- | ||
+ | | SATA || Example | ||
+ | |- | ||
+ | | SD/MMC || Example | ||
+ | |- | ||
+ | | SPI || Example | ||
+ | |- | ||
+ | | SPWG/JEDIA || Example | ||
+ | |- | ||
+ | | UART || Example | ||
+ | |- | ||
+ | | USB || Example | ||
+ | |- | ||
+ | | Watchdog || Example | ||
+ | |} | ||
+ | |||
+ | {| align="right" | ||
+ | | __TOC__ | ||
+ | |} | ||
==ADC== | ==ADC== | ||
Line 49: | Line 96: | ||
==I2C== | ==I2C== | ||
Example | Example | ||
+ | |||
+ | ==IR== | ||
+ | To decode the infrared signals and provide an uniform interface | ||
+ | lircd -d /dev/lirc0 | ||
+ | |||
+ | used parameters: | ||
+ | -d --device=device read from given device | ||
+ | -u --uinput generate Linux input events | ||
+ | |||
+ | Executes commands on an IR signal decoded by lircd, | ||
+ | irexec -d /devlirc0 | ||
+ | |||
+ | Note: | ||
+ | if show these message after running lircd | ||
+ | lircd: can't open or create /var/run/lirc/lircd.pid | ||
+ | lircd: No such file or directory | ||
+ | It has to add the "/var/run/lirc" folder | ||
+ | mkdir /var/run/lirc | ||
+ | |||
+ | How to debug: | ||
+ | |||
+ | 1. To check that signals are decoded correctly | ||
+ | mode2 -d /dev/lirc0 | ||
+ | It repeats to show "space" and "pulse" while clicking a control button | ||
+ | space 8451531 | ||
+ | pulse 476 | ||
+ | |||
+ | 2. To check input events. | ||
+ | |||
+ | First, It must add the parameter,"-u", in lircd command | ||
+ | lircd -d /dev/lirc0 -u | ||
+ | It will register at inputX, | ||
+ | input: lircd as /devices/virtual/input/input1 | ||
+ | Run evtest to check events | ||
+ | evtest -d /dev/input/event1 | ||
==SPWG/JEDIA== | ==SPWG/JEDIA== | ||
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==Watchdog== | ==Watchdog== | ||
Example | Example | ||
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Revision as of 04:25, 11 August 2016
Feature | Description |
---|---|
#ADC | analogue to digital converters |
Backlight | Enable/read and modify backlight brightness |
Camera | Example |
CAN Bus | CAN subsystem |
CPU Frequency | Example |
Ethernet | Example |
Framebuffer | Example |
GPIO | Example |
I2C | Example |
IR | InfraRed |
One Wire | Example |
RTC | Example |
SATA | Example |
SD/MMC | Example |
SPI | Example |
SPWG/JEDIA | Example |
UART | Example |
USB | Example |
Watchdog | Example |
ADC
analogue to digital converters
Backlight
Enable/read and modify backlight brightness
Camera
Example
CAN Bus
Prerequisites
Testing
- Connect can0 and can1
- <CAN1_D+> connect to <CAN2_D+>
- <CAN1_D-> connect to <CAN2_D->
- Configure
-
# ip link set can0 up type can bitrate 125000
-
# ip link set can1 up type can bitrate 125000
- Command
- Test 1
# candump can1 &
# cansend can0 12345678#123412341234
- The following shows the result
-
can1 12345678 [6] 12 34 12 34 12 34
- Test 2
# cansend can0 133#ababdede
- The following shows the result
-
can1 133 [4] AB AB DE DE
- Test 2
CPU Frequency
Prerequisites
Testing
Ethernet
Example
Framebuffer
Example
GPIO
Example
I2C
Example
IR
To decode the infrared signals and provide an uniform interface
lircd -d /dev/lirc0
used parameters:
-d --device=device read from given device -u --uinput generate Linux input events
Executes commands on an IR signal decoded by lircd,
irexec -d /devlirc0
Note: if show these message after running lircd
lircd: can't open or create /var/run/lirc/lircd.pid lircd: No such file or directory
It has to add the "/var/run/lirc" folder
mkdir /var/run/lirc
How to debug:
1. To check that signals are decoded correctly
mode2 -d /dev/lirc0
It repeats to show "space" and "pulse" while clicking a control button
space 8451531 pulse 476
2. To check input events.
First, It must add the parameter,"-u", in lircd command
lircd -d /dev/lirc0 -u
It will register at inputX,
input: lircd as /devices/virtual/input/input1
Run evtest to check events
evtest -d /dev/input/event1
SPWG/JEDIA
Standard Panels Working Group (SPWG)
Japan Electronic Industry Development Association (JEIDA)
How to setting SPWG/JEIDA mode in RISC?
Modify Register GPR(IOMUXC_GPR2)value
Address : 0x020E0008(h)
BIT6 and BIT8 set "0" (SPWG)
BIT6 and BIT8 set "1" (JEIDA)
One Wire
Example
RTC
Example
SATA
Example
SD/MMC
Example
SPI
Example
UART
Example
USB
Example
Watchdog
Example