Can i do it in an app? I’m not familair with legato. Just like the helloworld app and instaid of the LE_INFO i need to write system(i2cget -y 5 0x5b 0x00 > /tmp/test.txt)? What i also want is to send this to datahub.
Yes, you can do this in unsandboxed legato app
You can then read /tmp/test.txt inside your app
You can add some sleep() inbetween
It looks like my i2cget won’t work
[1/7] Compiling C source
FAILED: /home/lukas/Documents/MangOH/_build_helloWorld/wp77xx/component/18d9b6c36944259de3cc6094b6e7b806/obj/345c983f9563b0189a5a82859aa12ccd.o
/home/lukas/Documents/MangOH/leaf-data/MangOHYellow/wp77-toolchain/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc --sysroot=/home/lukas/Documents/MangOH/leaf-data/MangOHYellow/wp77-toolchain/sysroots/armv7a-neon-poky-linux-gnueabi -MMD -MF /home/lukas/Documents/MangOH/_build_helloWorld/wp77xx/component/18d9b6c36944259de3cc6094b6e7b806/obj/345c983f9563b0189a5a82859aa12ccd.o.d -Wall -Werror -fvisibility=hidden -c /home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c -o /home/lukas/Documents/MangOH/_build_helloWorld/wp77xx/component/18d9b6c36944259de3cc6094b6e7b806/obj/345c983f9563b0189a5a82859aa12ccd.o -DLE_FILENAME=`basename /home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c` -DMK_TOOLS_BUILD -DLEGATO_EMBEDDED -fPIC -I /home/lukas/Documents/MangOH/_build_helloWorld/wp77xx -I/home/lukas/Documents/MangOH/leaf-data/MangOHYellow/wp77-legato/interfaces -I/home/lukas/Documents/MangOH/leaf-data/MangOHYellow/wp77-legato/framework/include -I/home/lukas/Documents/MangOH/leaf-data/MangOHYellow/wp77-legato/build/wp77xx/framework/include -I/home/lukas/Documents/MangOH/helloworld -I/home/lukas/Documents/MangOH/_build_helloWorld/wp77xx/component/18d9b6c36944259de3cc6094b6e7b806/src -DLE_COMPONENT_NAME=helloComponent -DLE_LOG_SESSION=helloComponent_LogSession -DLE_LOG_LEVEL_FILTER_PTR=helloComponent_LogLevelFilterPtr
/home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c: In function ‘_helloComponent_COMPONENT_INIT’:
/home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c:7:16: error: ‘i2cget’ undeclared (first use in this function); did you mean ‘socket’?
system(i2cget -y 5 0x5b 0x00 > /tmp/text.txt);
^~~~~~
socket
/home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c:7:16: note: each undeclared identifier is reported only once for each function it appears in
/home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c:7:24: error: ‘y’ undeclared (first use in this function); did you mean ‘yn’?
system(i2cget -y 5 0x5b 0x00 > /tmp/text.txt);
^
yn
/home/lukas/Documents/MangOH/helloworld/helloComponent/helloWorld.c:7:26: error: expected ‘)’ before numeric constant
system(i2cget -y 5 0x5b 0x00 > /tmp/text.txt);
^
ninja: build stopped: subcommand failed.
The terminal process "bash '-c', 'mkapp ${LEGATO_DEF_FILE} -s components -t ${LEGATO_TARGET} -w ${LEGATO_OBJECT_DIR} -o ${LEGATO_OUTPUT_DIR} && update ${LEGATO_UPDATE_FILE}'" failed to launch (exit code: 1).
Terminal will be reused by tasks, press any key to close it.
You need to add double quote
Ohw, i need to read better. I’m sorry.
The build and install is succesfully complete. But how can i read the file. And how can i send it to datahub?
Sorry for this many questions!
I also got no text.txt file. Do i need to make it manual?
You need to check logread to see why no file output
Yeah i saw it:
Jun 21 14:04:18 swi-mdm9x28-wp user.err Legato: =ERR= | i2c[1042] | sh:
Jun 21 14:04:18 swi-mdm9x28-wp user.err Legato: =ERR= | i2c[1042] | i2cget: not found
Jun 21 14:04:18 swi-mdm9x28-wp user.err Legato: =ERR= | i2c[1042] |
Jun 21 14:04:19 swi-mdm9x28-wp user.err kernel: [ 1650.266938] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:2 cur:0 tx) bc(rx:2 tx:1) mode:FIFO slv_addr:0x55 MSTR_STS:0x0d1343c8 OPER:0x00000010
Jun 21 14:04:19 swi-mdm9x28-wp user.err kernel: [ 1650.281797] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:2 cur:0 tx) bc(rx:2 tx:1) mode:FIFO slv_addr:0x55 MSTR_STS:0x0d1343c8 OPER:0x00000010
Thats the log i get when i do logread -f |grep i2c
My slave adress is 0x5b why does it said 0x55?
My program is correct:
#include "legato.h"
COMPONENT_INIT
{
while (1)
{
system("i2cget -y 5 0x5b 0x00 > /tmp/text.txt");
sleep(10)
;
}
}
you need to use full path:
system(“/usr/sbin/i2cget -y 5 0x5b 0x00 > /tmp/text.txt”);
I get the same error in logread
Jun 21 14:49:44 swi-mdm9x28-wp user.err Legato: =ERR= | i2c[31996] | sh:
Jun 21 14:49:44 swi-mdm9x28-wp user.err Legato: =ERR= | i2c[31996] | usr/sbin/i2cget: not found
Jun 21 14:49:44 swi-mdm9x28-wp user.err Legato: =ERR= | i2c[31996] |
Jun 21 14:49:49 swi-mdm9x28-wp user.err kernel: [ 4380.266768] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:2 cur:0 tx) bc(rx:2 tx:1) mode:FIFO slv_addr:0x55 MSTR_STS:0x0d1343c8 OPER:0x00000010
Jun 21 14:49:49 swi-mdm9x28-wp user.err kernel: [ 4380.281660] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:2 cur:0 tx) bc(rx:2 tx:1) mode:FIFO slv_addr:0x55 MSTR_STS:0x0d1343c8 OPER:0x00000010
you miss “/” at the beginning
Oh, wake me up 
Jun 21 14:57:59 swi-mdm9x28-wp user.err kernel: [ 4870.266872] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:2 cur:0 tx) bc(rx:2 tx:1) mode:FIFO slv_addr:0x55 MSTR_STS:0x011363c8 OPER:0x00000010
Jun 21 14:57:59 swi-mdm9x28-wp user.err kernel: [ 4870.281722] i2c-msm-v2 78b8000.i2c: NACK: slave not responding, ensure its powered: msgs(n:2 cur:0 tx) bc(rx:2 tx:1) mode:FIFO slv_addr:0x55 MSTR_STS:0x011363c8 OPER:0x00000010
Now i only get this. Like i said before the slave adress is nog correct. slv_addr:0x55 how can i fix it?
that message is not related, you can ignore it
Yes, it works
But now i get this: 0x10
I want just want some usefull data form it? And send this to datahub
0x10 is your useful data
Owh, and how can i transform it into themperature or something?
i don’t know, that is your sensor!!!
You need to check datasheet…
Oke 
Do you know how i can get this data on Octave with datahub?