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Printpix52

Bascom Member



Joined: 18 Jun 2014
Posts: 222
Location: D.F.

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PostPosted: Thu May 25, 2017 3:17 am    Post subject: Reply with quote

Hi all!!
Does anyone have a manual "How to prepare a BASCOM i2c address from an i2c address?" I would like to read this manual since the help does not appear DS1307 nor example. Very Happy
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albertsm

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Joined: 09 Apr 2004
Posts: 5024
Location: Holland

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PostPosted: Thu May 25, 2017 10:15 am    Post subject: Reply with quote

The manual/help does mention that bascom i2c address is vendor address shift left by 2. Or multiply by 2.
The i2c scanner will give this info.
if you had done some search on the forum you would have found that too.
The more interesting question is : why does bascom use a different address?

After an i2cstart we must send the address of the slave.
This address has a Read/Write bit at bit position 0, which indicates if we want to read or write.
Thus the 8 bit we must send is A6,A5,A4,A3,A2,A1,A0, R/W
While vendor uses address &H20 for example, we must send it as &H40 because of the R/W bit.

And while R/W is not actually an address, i think it simplifies dealing with I2C since it is always sent as part of the address.

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