Nicholas wrote:

> In the case I will get, SSPADD = 24;    //400KHZ Baud clock @ 40MHz
>
> Am I correct to say that?


Yes you are correct.


> I have rewrite the I2C_inital as shown below. I added in the
> SSPCON1 which I
> miss out at first. But I do not know whether the C18 complier command
> OPENI2C(MASTER, SLEW_ON) is the same as using SSPCON1.


Since I have never used the Microchip C18 C compiler, I don't know how much
of the low level details those library functions encapsulate. You really
need to see the source code (or resultant assembly language) behind  the
'OPENI2C()' function, for example, to see what's really going  at the
register level.


Best regards,

Ken Pergola

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