Hi!
I want my i2c bus on lower speed.
In i2c.c it says:
#define PRESCALE120M 12  // factor = 12, 120MHz/10MHz
and later
*pTWI_CLKDIV = CLKLOW(67) | CLKHI(33);  // For 100KHz SCL speed: CLKDIV = (1/100KHz)/(1/10MHz) = 100
 
So if I wanted my bus on 10Khz, would I need to set PRESCALE120M to 120?
Or is there any other way to set the i2c bus speed?
 
Thanks,
Mathias

How do I get the I2C on its slowest setting?

Hi,
It seems that prescale is about the number of clock circles that the system use for a internal time reference. I havent completely understood it myself but i suggest for simplicity to have a value of 0, so you use the SCLK(System clock) itsef. Then use clkhigh and clklow so that you adjust your clock. As i said these are suggestions, cause i am confused too! Study the Blackfin537 hardware refernce in the TWI sector for details and to make your own view.