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TRF7970ABP Sending custom command to ISO15693 compliant chip

recursive
Intellectual 325 points


I wish to send the command code 0xAD with mask length = 0 and no mask value. I modified the TRF7970ABP code by changing the following line :

    buf[0] = 0x8F;
    buf[1] = 0x91;                                        // send with CRC
    buf[2] = 0x3D;                                        // write continuous from 1D
    buf[5] = flags;                                        // ISO15693 flags
    buf[6] = 0xAD;                                        // custom command code

I tried just modifying buf[6] and my i_reg is stuck at 0x00 (timer interrupt). Will the remaining parameters be automatically calculated? If not, what modifications do I need to perform?