Hello,
Has anyone managed to have a communication with a EEPROM 24lc256 with the current libmaple version using the Wire object ?
Are these methods supposed to work to write and read to/from the 24lc ?
http://pastebin.com/f3a36644b
All i read is '0'.... same as if i unplug the chip.
Thanks a lot for any help,
Xavier
perry
Administrator
Hi Xavier,
I have some development code you can try here:
https://github.com/leaflabs/libmaple/tree/i2c-wip
If you look at main.cpp, you'll see a basic example of reading and writing to the 24LC256.
I will clean up the code and merge it into the master branch this week. If you wait until then I can help you then.
-perry
Thanks Perry,
I wanted to give a try to your library but it does not compile :
libmaple/nvic.c: In function 'nvic_init':
libmaple/nvic.c:108: error: 'NR_INTERRUPTS' undeclared (first use in this function)
libmaple/nvic.c:108: error: (Each undeclared identifier is reported only once
libmaple/nvic.c:108: error: for each function it appears in.)
Then PCLK1 is also undeclared...
As i don't really need performance for my 24LC256 access, i thought i could use the software/synchronized current version of i2c.
Anyway... no problem, take your time to clean the code and merge this into the master branch ;-)
Xavier
Anton, Perry,
I'm new to git but i cannot figure out what i do wrong :
$ git checkout i2c-wip
Switched to branch 'i2c-wip'
$ make
================================================================================Build info:
BOARD: maple
MCU: STM32F103RB
MEMORY_TARGET: flashSee 'make help' for all possible targets
================================================================================
[CC] ./libmaple/adc.c
[CC] ./libmaple/bkp.c
[CC] ./libmaple/dac.c
[CC] ./libmaple/dma.c
[CC] ./libmaple/exti.c
[CC] ./libmaple/flash.c
[CC] ./libmaple/fsmc.c
[CC] ./libmaple/gpio.c
[CC] ./libmaple/iwdg.c
[CC] ./libmaple/nvic.c
libmaple/nvic.c: In function 'nvic_init':
libmaple/nvic.c:108: error: 'NR_INTERRUPTS' undeclared (first use in this function)
libmaple/nvic.c:108: error: (Each undeclared identifier is reported only once
libmaple/nvic.c:108: error: for each function it appears in.)
make: *** [build/./libmaple/nvic.o] Error 1
perry
Administrator
Hi Xavier,
I'm not sure how you checked out the branch. Try this:
git fetch
git checkout i2c-wip
git reset --hard origin/i2c-wip
make clean
makeHi Perry,
Thanks for you help but... same problem.
I have also this error when downloading the full branch here :
https://github.com/leaflabs/libmaple/tree/i2c-wip
In what file is supposed to be this NR_INTERRUPTS constant?
Xavier
perry
Administrator
hi xavier,
try again. I just pushed some changes. I didn't have time to add anything but at least it should compile now and write/read to the 24LC2556.
-perry
Thanks, now it compiles.
But i cannot make it work: i've changed the slave_address because my 24LC256 is wired to '000'.
I plugged it to SDA 7 and SCL 6.
But it freezes my maple. I cannot even flash it anymore. I have to use the "perpetual boot loader" trick.
BTW, the doc http://leaflabs.com/docs/i2c.html says other pins for the i2c1.
That would be great to have a kind of timeout in the i2c functions so that it returns with an error if something wrong happens.
Is it possible to try the communication at 10Khz ?
Thanks,
Xavier
perry
Administrator
Xavier,
Yes, sorry. I turned off the USB in the last commit while I was testing to minimize other things going off in the chip. The latest push should reenable them, so you can flash it. It only works with I2C1, pins 5 (SCL) and pins 9 (SDA). You also need external pullups, since those outputs are open drain.
I will add a timeout.
The speed is currently fixed at 100khz standard mode, but I will make it configurable.
Thanks a lot Perry,
It works now :-)
I thought that the pins defined in i2c_dev1 (6 and 7 in i2c.c) were the ones i had to plug my eeprom.... I missed something.
Is 64 bytes the maximum length of data during a transfer ?
I tried with more and i get weird results.
Anyway, i'll cut my data in several pieces and can go ahead.
Thanks again,
Xavier
Hi Perry,
i check your code ... i have all the problem because i use high density micro ... that i know and now i try to use the i2c2 i2c1 don't can see if it work but i think that it work on maple ... i tested it on maple v5 1 week ago ...
So I see that inside the code there're some infinite loop and that is not good ... because if you have some problem on device you freeze the program ... could be better if you put inside a time out ..
Do you have some suggestions about the i2c on second i2c2 channel ?
I need to pull up the pin ? I need to set the pinmode as output for sda and scl port ?
I need to add rcc for that device ?
Now don't work i see only a glitch on sda a and clock is a 0 level .. don't see any signal.
Best
Roberto
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