Timeline for I2C Addressing after device address is known
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Mar 2, 2018 at 1:27 | comment | added | Janka | Maybe you are missing these include files in your installation? They belong to the linux-libc-dev package in Raspbian. | |
| Mar 2, 2018 at 1:22 | comment | added | Brandon Williams | Gcc filename.c -o exfilename | |
| Mar 2, 2018 at 1:19 | comment | added | Janka | If you recompiled it with the additional includes, it should compile with no warnings at all. Sometimes -std=c99 is required, this depends on the compiler you used. You did gcc this on the Raspi, didn't you? Because an x86 binary won't run on the Raspi. | |
| Mar 2, 2018 at 1:08 | comment | added | Brandon Williams |
It gave me warnings originally during compilation about "assignment from incompatible pointer type" for i2c_transfer.msgs =i2c_msgs;, could that be the issue?
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| Mar 2, 2018 at 1:00 | comment | added | Janka |
Hmm, that's unfortunate, because it works for me (with another chip at 0x50). Try running it with a debugger to find the culprit: gdb ./i2ctest2, then run at the gdb prompt.
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| Mar 2, 2018 at 0:44 | comment | added | Brandon Williams |
After compilation, ./i2ctest2 (named it that with gcc -o) results in a Segmentation Fault
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| Mar 2, 2018 at 0:30 | comment | added | Janka |
Please add #include <sys/ioctl.h> and #include <linux/i2c.h> to the list of includes. Unfortunately, the explicit includes needed change with each API version.
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| Mar 2, 2018 at 0:29 | history | edited | Janka | CC BY-SA 3.0 |
added 56 characters in body
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| Mar 1, 2018 at 23:42 | comment | added | Brandon Williams |
In the code, i get several errors. The first is the struct i2c_msg i2c_msgs[2]; gets an error saying the array type has and incomplete element type. And secondly, did you mean something else than I2C_M_RD like something from here
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| Mar 1, 2018 at 21:30 | comment | added | Janka | If you are confused, what the kernel driver does is S,0x70WR, 0x08,S,0x70RD,xx,xx,xx,xx,xx,xx,P | |
| Mar 1, 2018 at 21:28 | comment | added | Janka | The code on that site pocketmagic.net/mics-vz-89-air-quality-sensor says it's 6 bytes to read. | |
| Mar 1, 2018 at 21:15 | comment | added | Brandon Williams | Are we ignoring the 7th byte since you defined length of rdata array as 6? | |
| Mar 1, 2018 at 21:02 | history | answered | Janka | CC BY-SA 3.0 |