E-COM-NET

Hi,
I am trying out the Ada I2c interface http://sourceforge.net/projects/raspi-i2c-ada/ and have downloaded and built the library. However, when I try and build the example test program I get the following ld errors: -

CODE: SELECT ALL: gprbuild test.gpr gcc-4.6 t.o -o t /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `write_quick': i2c_interface.c:(.text+0x24): undefined reference to `i2c_smbus_write_quick' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `read_byte': i2c_interface.c:(.text+0x4c): undefined reference to `i2c_smbus_read_byte' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `write_byte': i2c_interface.c:(.text+0x84): undefined reference to `i2c_smbus_write_byte' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `read_byte_data': i2c_interface.c:(.text+0xbc): undefined reference to `i2c_smbus_read_byte_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `write_byte_data': i2c_interface.c:(.text+0x104): undefined reference to `i2c_smbus_write_byte_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `read_word_data': i2c_interface.c:(.text+0x13c): undefined reference to `i2c_smbus_read_word_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `write_word_data': i2c_interface.c:(.text+0x184): undefined reference to `i2c_smbus_write_word_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `process_call': i2c_interface.c:(.text+0x1cc): undefined reference to `i2c_smbus_process_call' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `read_block_data': i2c_interface.c:(.text+0x20c): undefined reference to `i2c_smbus_read_block_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `write_block_data': i2c_interface.c:(.text+0x25c): undefined reference to `i2c_smbus_write_block_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `read_i2c_block_data': i2c_interface.c:(.text+0x2ac): undefined reference to `i2c_smbus_read_i2c_block_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `write_i2c_block_data': i2c_interface.c:(.text+0x2fc): undefined reference to `i2c_smbus_write_i2c_block_data' /home/pi/raspi-i2c-ada-code/lib-static//libi2c-ada.a(i2c_interface.o): In function `block_process_call': i2c_interface.c:(.text+0x34c): undefined reference to `i2c_smbus_block_process_call' collect2: ld returned 1 exit status gprbuild: link of t.adb failed

I have done some digging around and found that these undefined functions are defined in i2c-dev.h but the question is, where is and how should I link to their implementation/library

by **joan** » Wed Oct 10, 2012 7:38 pm

Might be worth checking to see if libi2c-dev is present on your system.

sudo apt-get install libi2c-dev

may be all that you need.

by **pygmy_giant** » Wed Oct 10, 2012 7:51 pm

drivers schmivers

ada-fruit schmada fruit

libi2c-dev schmlibi2c-dev

I just did this: http://www.njbsmith.net/miscellaneous/Ivansense_6050_test.c

hack it if you can

by **richtoy** » Wed Oct 10, 2012 7:56 pm

Thanks for the reply. I followed the instructions and have installed i2c-tools libi2c-dev and python-smbus. I can see the chip and successfully drive it from the command line with the following: -

CODE: SELECT ALL: pi@raspberrypi ~ $ i2cset -y 0 0x20 0x00 0x00 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x01 0x00 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x01 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x02 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x03 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x00

The only issue is linking because I don't appear to be able to find a library containing the missing symbols

by **techpaul** » Wed Oct 10, 2012 8:06 pm

richtoy wrote:Thanks for the reply. I followed the instructions and have installed i2c-tools libi2c-dev and python-smbus. I can see the chip and successfully drive it from the command line with the following: -

CODE: SELECT ALL

pi@raspberrypi ~ $ i2cset -y 0 0x20 0x00 0x00 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x01 0x00 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x01 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x02 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x03 pi@raspberrypi ~ $ i2cset -y 0 0x20 0x12 0x00

The only issue is linking because I don't appear to be able to find a library containing the missing symbols

Hmm I see you installed python-smbus which is for python, but you are building a gcc (C) porogramme, you have not by chance made reference in your code to python routines instead of C library functions?

Thus confusing the compiler.

by **sjw** » Tue Nov 20, 2012 3:43 pm

I just came across this post, and helped out @richtoy already. But, for completeness, the problem is that the Linux I2C header <linux/i2c-dev.h> doesn't correspond to any library; instead, all the functions are declared inline. This is fine if you're writing C, but Ada doesn't understand C headers.

My solution was to create a C file which provides a callable interface to each declared function, so that it can be called from Ada using pragma Import.

The project's Makefile is supposed to compile this file and include it in the project library, but something went wrong on @richtoy's machine. AFAICR he retried it and it worked.

undefined reference to i2c_smbus_read_byte_data'

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