error: ‘I2C_SMBUS_BLOCK_MAX’ undeclared

[pmel]

Hello,

I have a BerryGPS-IMUv3, Raspberry Pi 3B+, running Raspbian Buster full (2019-07-10).

GPS module works fine.
sudo i2cdetect -y 1 – shows 1C, 6A and 77.

I have followed the guides including this https://github.com/ozzmaker/BerryIMU/issues/8 . However, when compiling gyro_accelerometer_tutorial02.c I get the following error : IMU.c:143:14: error: ‘I2C_SMBUS_BLOCK_MAX’ undeclared (first use in this function)
__u16 block[I2C_SMBUS_BLOCK_MAX];

N.B. The readme says that v1 and v2 are supported, implication that v3 is NOT supported, is this correct?

Any guidance greatly appreciated.

[Mark Williams]

it looks like you are missing some libraries

try installing these

sudo apt-get install i2c-tools libi2c-dev python-smbus

Mark --OzzMaker.com --

[pmel]

Hi Mark,

Firstly, many thanks for your speedy response and support.

I ran the command / installed the packages you specified, however, it did not resolve the error!

Here is the output, also I have attached a screenshot of the shell. Any further ideas please?

$ sudo apt-get install i2c-tools libi2c-dev python-smbus
Reading package lists… Done
Building dependency tree
Reading state information… Done
i2c-tools is already the newest version (4.1-1).
libi2c-dev is already the newest version (4.1-1).
python-smbus is already the newest version (4.1-1).
The following package was automatically installed and is no longer required:
rpi.gpio-common
Use ‘sudo apt autoremove’ to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

 

Attachments:

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   2019-08-05-150041_1920x1080_scrot.png
   

[Mark Williams]

Mmmm… strange.
do you have this file?
/usr/include/linux/i2c-dev.h

can you show me the output of this command
dpkg -l libi2c-dev

Also try this header file..
1. go into the directory where the code is
2. download this older header file
wget ozzmaker.com/downloads/i2c-dev.h
3. open IMU.c and change this line;
#include "linux/i2c-dev.h"
to this
#include "i2c-dev.h"
4. try to compile again

Mark --OzzMaker.com --

[Mark Williams]

i forgot to add.. ill need to check to see if something has changed with Raspbian Buster

Mark --OzzMaker.com --

[pmel]

Hi Mark,

Again, many thanks for your speedy response and support, it’s very much appreciated!

To answer your questions;

I do have just 1 i2c-dev.h (I did use “find” to search the entire file-system), ls -l

-rw-r–r– 1 root root 2612 Dec 3 2018 /usr/include/linux/i2c-dev.h

Interestingly, and I think related, is this post, https://raspberrypi.stackexchange.com/questions/37689/how-do-i-use-the-i2c-bus, As can be seen from the “ls -l”, i2c-dev.h with “Raspbian Buster” is 2612 in size, the download you suggest is 11507!

-rw-r–r– 1 pi pi 11507 Aug 6 03:49 i2c-dev.h

$ dpkg -l libi2c-dev
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-===================================================
ii libi2c-dev 4.1-1 armhf userspace I2C programming library development files

I followed your re-compile instructions, and THAT WORKED! many thanks.

I have a suspicion / intuition, that this issue is related to the “Rasbian Buster” build / install, PLEASE let us know what you find?

Again, many thanks!

[Author]

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