Dear all,
I try to drive a MIDAS-Display (ST7032 Controller) with a ATMega 168pa. I have also two port expander and some other I2C connected with the bus.
After a long sequence of trying to initialize the display I got doubts whether the TWI is working. I also tested both expander and also no reaction.
The pull up resistors are connected 3,3V -> 4k7.
By reading the documentation from Atmel for ATMega168 I found this remark:
[quote:a699865dd8]The PRTWI bit in Power Reduction Register - PRR on page 40 must be written to zero to
enable the 2-wire Serial Interface.[/quote:a699865dd8]
PRTWI is bit 7
In m168pdef.dat I found PRR=$64. Is it comparable with &H64? Is it possible to change to &H24 ($24, in this case bit 7 would be 0)? Is it the reason why TWI can´t be accessed?
best regards,
Benedikt
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