inline int i2c_start(i2c_t *obj) {
int status = 0;
// 8.1 Before master mode can be entered, I2CON must be initialised to:
// - I2EN STA STO SI AA - -
// - 1 0 0 0 x - -
// if AA = 0, it can't enter slave mode
i2c_conclr(obj, 1, 1, 1, 1);
// The master mode may now be entered by setting the STA bit
// this will generate a start condition when the bus becomes free
i2c_conset(obj, 1, 0, 0, 1);
i2c_wait_SI(obj);
status = i2c_status(obj);
// Clear start bit now transmitted, and interrupt bit
i2c_conclr(obj, 1, 0, 0, 0);
return status;
}
int i2c_slave_read(i2c_t *obj, char *data, int length) {
int count = 0;
int status;
do {
i2c_clear_SI(obj);
i2c_wait_SI(obj);
status = i2c_status(obj);
if((status == 0x80) || (status == 0x90)) {
data[count] = I2C_DAT(obj) & 0xFF;
}
count++;
} while (((status == 0x80) || (status == 0x90) ||
(status == 0x060) || (status == 0x70)) && (count < length));
if(status != 0xA0) {
i2c_stop(obj);
}
i2c_clear_SI(obj);
return count;
}
