I use the TRF for creating my own RFID Reader, using SPI. Reading and
writing from and to the registers basically works fine, but there are
some issues left.
Writing to e.g. the Sysclock register (0x09) does only work if I read
from the register beforehand (result can be measured with an
oscilloscope). The same applies for other registers. This effect is not
documented in the datasheet.
For setting up the communication with tags, I try to write to registers
0x1D and 0x1E and again, I read from those before. After writing, I read
from the registers in order to doublecheck. Strange: For 0x1D, it works
fine and for 0x1E it does not.
Does anyone know how to do this correctly?