Hi there,

I have a problem with a m32c micro ... Im implementing an i2c master,

and when I generate the start condition, as soon as I write stspsel back to 0 (otherwise, I cannot write to the bus)

the lines SDA and SCL are pulled up for a while until I write to the u2tbl register ... this causes my part to think

that a clock/data was coming, which is wrong ...

Here is the code. Any help? What am I doing wrong? Thanks.

void i2c_start(void)
{
    unsigned int dly_tmr;
    dly_tmr = ta2;
    stspsel_u2smr4    = 0;
    while((dly_tmr - ta2) < _1ms ); // delay
    stareq_u2smr4 = 1;            // Start condition generate bit
    dly_tmr = ta2; while((dly_tmr - ta2) < _1ms ); // delay
    stspsel_u2smr4    = 1;        // SCL, SDA output select bit - set
    dly_tmr = ta2; while((dly_tmr - ta2) < _1ms ); // delay
    stspsel_u2smr4    = 0;        // SCL, SDA output select bit - reset   
}

main{

...

    te_u2c1 = 1;                // transmit data (enable bit)
    while(!ti_u2c1);            // wait for tx buffer to be empty
    ir_s2ric = 0;                // reset reception interrupt bit
    ir_s2tic = 0;                // reset transmission interrupt bit

    i2c_start();   
    u2tbl = Dev;                // transmit data

...

}