Difference between revisions of "IoTGateway/Features/Linux/Peripheral"
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===Prerequisites=== | ===Prerequisites=== | ||
===Testing=== | ===Testing=== | ||
| + | ;Check available cpu frequency policy | ||
| + | # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors | ||
| + | conservative ondemand userspace powersave interactive performance | ||
==Ethernet== | ==Ethernet== | ||
Revision as of 08:31, 11 August 2016
Contents
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
CPU Frequency
Prerequisites
Testing
- Check available cpu frequency policy
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors conservative ondemand userspace powersave interactive performance
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
One Wire
Example
RTC
Example
SATA
Example
SD/MMC
Example
SPI
Example
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)
UART
Example
USB
Example
Watchdog
Example