Part Number:LMK04828
To initialize a project with DAC38RF8xEVM board. Demonstrated by the DAC38RF8x GUI software to configure both DAC and LMK on the board. the GUI is programming the on board FTDI USB device (via FT supported D2xxx API library) then let it program DAC and LMK through SPI. I have successfully communicated to DAC by FT MPSSE mode. Due to the hardware wiring mapping on the board, I have to use bit-bang mode (Asynchronous) to program LMK through FT. All write to registers looks good but not be able to read the register data back, of course can not prove write is right if can not read back. Before going further, I need to configure the followings if anyone in this group would help if familiar with the DAC38RF8xEVM and the GUI software,
1. If the schematic/datasheet shows LMK04828 don't have SPI SDO pin exclusively and if have, it shares with RESET pin. That is why I think the LMK is using 3 wire mode by default or configured by FT. So the data read back from LMK to FT is also through LMK SDIO pin. I would like someone knowledge this can confirm. Or explain why 4 wire spi looks is impossible to me on this board. Therefore I can program the same accordingly.
2. Further more, for either 3 wire or 4 wire case, anything need to configure the LMK register to make the spi work? especially for 3 wire case, I failed to read data back so far. Attached a snapshot to show that all bit-bang signals are right but just don't see data appear on FT MOSI line (connected to LMK SDIO pin) for 3 wire mode case while reading register 0x04.
I would provide more information but to start with this new thread, rather make it simple to understand.
Thanks,
Chester
