My DS1307

Rsadeika

Sometime ago I purchased an ETT mini-10 RTC board, tried it out with JonnyMac's DS1307_v2008.sxb program, and it seems to work. Now I was trying to figure out the slave address for the unit, and I am lost. In the program there is a line, I2CSEND SDA, __PARAM1, ackNak, I believe the ackNak is the slave address, but nowhere in the program is it defined, it is just a variable. So do I assume that the slave address is 0? Also I believe the DS1307 can run at 100KHz or 400KHz, I guess I should assume that SX/B I2C command is setup for the slower speed of 100KHz? I guess next I will try to use the 56 bytes of RAM that is available on the chip, wonder what I can do with that?

Thanks

Ray

Zoot

The address is not in that line -- it's an excerpt from the subroutine for sending a byte out on the I2C bus. To address the chip, the address is sent, then the register to read/write. __PARAM1 (the byte to send) is loaded by the main program or higher level routine that calls that subroutine.

ack/nak is read/sent by I2C devices and may or may not be parsed or relevant depending on your needs. In this case I wouldn't worry about it if you are using pre-constructed routines.

Default speed for I2C in SX/B 1.51.03 is ~100khz.

I encourage you to read up on the I2C spec.

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