Forum Post: RE: RX64M Simple I²C FIT module issue

I have nothing changed to the I²C code of the fit module. The only thing I have changed for the SPI code in r_sci_rx64m.c was the calling order of SoftwareUnlock . New:  static void rxi_handler(sci_hdl_t const hdl) { [...]             hdl- tx_idle = true;             R_BSP_SoftwareUnlock(&hdl- xcvr_lock);             /* Do callback if available */             if ((hdl- callback != NULL) && (hdl- callback != FIT_NO_FUNC))             {                 args.hdl = hdl;                 args.event = SCI_EVT_XFER_DONE;                 hdl- callback((void *)&args);             } [...] } Mind that the I²C address is 7 bit only (and not 8 bit) and you would need to divide an 8 bit address by 2. Also, I've set the pin configuration explicitly ( MPC , Portx . PDR , and Portx . PMR ) to make sure everything is set up correctly.