Nestor,
you cant' have output in '1' on I2C bus. The principle is to have output in
'0', pull-ups on the bus and when you want to set '1', just just switch TRIS to
'1'. And that's all.
Example routine for I2C START for 12F675 follows:
// I2C definitions
#define SCL TRISIO2
#define SDA TRISIO1
#define SCL_IN GPIO2
#define SDA_IN GPIO1
void i2c_start(void)
{
SDA = 1; // i2c start bit sequence
while( !SDA_IN) ;
i2c_delay();
SCL = 1;
while (!SCL_IN) ;
i2c_delay();
SDA = 0;
SDA_IN = 0;
i2c_delay();
SCL = 0;
SCL_IN = 0;
i2c_delay();
}
> ------------ Původní zpráva ------------
> Od: Néstor <nesto...@gmail.com>
> Předmět: [Sdcc-user] I2C with PIC 16f877 and 32Kbit 24AA32A EEPROM
> Datum: 11.2.2009 17:44:43
> ----------------------------------------
> Hello.
>
> I need some information about where to get some samples of a I2C
> implementation for a 16f877 PIC with 32Kbit EEPROM model 24AA32A also
> from Microchip.
>
> Any comments or suggestions are welcome, until now, I haven't been
> able to get it working, the PIC gets rebooted every time I execute the
> routines.
>
> I attach some of my code, I'm sorry, but's it's not well commented.
> The functions are Serial*.
>
> This is the main code which executes the functions, to be printed on a LCD:
>
> for (i=0; i<16; i++)
> {
> for (j=0; j<40; j++)
> {
> result = (SerialRead(i,j)%112)+16;
> PaintChar(result, j+1,i+1, MODE_EXOR);
> }
> }
>
> Any ideas, people??
>
> Thanks.
>
> --
> Néstor
> +34 687 96 74 81
> nesto...@gmail.com
>
>
>
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