Difference between revisions of "IoTGateway/Features/Linux/Peripheral"
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==CAN Bus== | ==CAN Bus== | ||
| − | ===Connect can0 and can1 | + | ===Prerequisites=== |
| − | <CAN1_D+> connect to <CAN2_D+> | + | ===Testing=== |
| + | :Connect can0 and can1 | ||
| + | ::<CAN1_D+> connect to <CAN2_D+> | ||
| − | <CAN1_D-> connect to <CAN2_D-> | + | ::<CAN1_D-> connect to <CAN2_D-> |
| − | |||
| − | |||
| − | |||
| − | + | :Configure | |
| − | + | :: <code># ip link set can0 up type can bitrate 125000</code> | |
| − | + | :: <code># ip link set can1 up type can bitrate 125000</code> | |
| − | |||
| − | |||
| − | |||
| − | Test 2 | + | :Command |
| − | # cansend can0 133#ababdede | + | ::Test 1 |
| − | The following shows the result | + | :: <code> # candump can1 &</code> |
| − | + | :: <code> # cansend can0 12345678#123412341234</code> | |
| + | :::The following shows the result | ||
| + | ::: <code> can1 12345678 [6] 12 34 12 34 12 34</code> | ||
| + | |||
| + | ::Test 2 | ||
| + | :: <code> # cansend can0 133#ababdede</code> | ||
| + | :::The following shows the result | ||
| + | ::: <code> can1 133 [4] AB AB DE DE</code> | ||
==CPU Frequency== | ==CPU Frequency== | ||
Revision as of 10:43, 9 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
Example
Ethernet
Example
Framebuffer
Example
GPIO
Example
I2C
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)
One Wire
Example
RTC
Example
SATA
Example
SD/MMC
Example
SPI
Example
UART
Example
USB
Example
Watchdog
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