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Many of us have done this but for professional reasons we are unable or unwilling to share the code. However, Robert Soubie detailed his adventures with I2CSlave using Melabs PICBasic, and posted all his code here...
http://www.astrosurf.com/soubie/pic_as_an_i2c_slave.htm
Well done Robert!
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Hi Melanie,
i tried Roberts I2C Slave routine, but it is not clear how to access the Slave with I2CREAD / I2CWRITE with Melabs PBP from the Master.
In the I2CREAD and I2CWRITE commands are also "address" parameters given, is this the same to be used as the parameter RXBuffer(0)?
Does any one have an exmaple for me?
Regards,
Ralf
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Other than telling you that Robert achieved the goal that many seek but few accomplish, and he documented everything on his website (I'm assuming it's all still there), I can't add any more, because I haven't actually tried his software myself.
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Hello Melanie,
yes there is a lot on the website, but there is not describd how to access it with I2CREAD / I2CWRITE. May be i am blind.... Maybe anyone else can help...?
Regards,
Ralf
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from the second page of his web site:Originally Posted by ralfmayr
http://www.astrosurf.com/soubie/fichiers/i2cInt.pbp
http://www.astrosurf.com/soubie/fichiers/Proc_i2c.pbp
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
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There simply is no "Happy Spam" If you do it you will disappear from this forum.
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You would still use I2CREAD and I2CWRITE as per normal in the Master PIC. It's only the slave PIC that would use the new routines.
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Hello Melanie,
hello Joe,
thanks for your answers.
I have the code from Robert, i also implemented his code in my interrupt
service of the slave (a 2431), all no problem, but:
The problem i have is that i do not understand how it works. When writing or reading with my master (a 6722) to / from the slave, i alwasy get sensless values from the slave. The slave routine from Robert waits for 3 RXbuffer values (0 - 2), the first value of RXBuffer(0) indicates in i2c_proc.pbp the var-id, all other two bytes are the values. But when writing three values with I2CWRITE sda, scl, addr, [b1, b2, b3], the service routine gives back "0" for all two TX Values (defined in the i2c_proc.pbp there have been other values defined).
In the pbp manual, there is also a value possible behind the address (before the "[", but using this value also for the RXBuffer(0) results also in senseless values.
So i think the I2CREAD / I2CWRITE command i use in a wrong way, so i am looking for a master code example, which controls a slave to see the correct usage.
Uff..... understood?
BR
Ralf
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