LT8900 support

planger wrote: Hexfet, I've followed (or I think) victzh's implementation. There are really different ways to program the RF chips and I think it's better to have specific functions called with their names. You can always only use the low level NRF functions which I did at the beginning and code from there. But for easier future development, I've implemented everything that would make your life easier to go from SPI dumps to protocol. Configure the LT8900 the same way, use the same type of address (2 to 8 bytes), change channel, switch TX<->RX,...

- Pascal

    if (Model.proto_opts[PROTOOPTS_FORMAT] == FORMAT_HONTAI) {
        XN297_Configure(BV(NRF24L01_00_EN_CRC) | BV(NRF24L01_00_CRCO) | BV(NRF24L01_00_PWR_UP));
    } else {
        NRF24L01_SetTxRxMode(TX_EN);
    }

hexfet wrote:
It would be better to avoid having code like this in a bunch of protocol files.

    if (Model.proto_opts[PROTOOPTS_FORMAT] == FORMAT_HONTAI) {
        XN297_Configure(BV(NRF24L01_00_EN_CRC) | BV(NRF24L01_00_CRCO) | BV(NRF24L01_00_PWR_UP));
    } else {
        NRF24L01_SetTxRxMode(TX_EN);
    }

Four of those if statements in the Hontai protocol could be replaced by one that sets the chip type, then each of the rest by one statement that works for all emulated devices.

  Radio_SetChip(XN297);
  Radio_SetAddress(addr, size);
  Radio_SetDataRate(RADIO_DATARATE_1M);
  Radio_SetCRC(2, 0x1021, 0xAA, 0x00, RADIO_CRC_SRC_INVERSE, RADIO_CRC_NORMAL);

victzh wrote: Considering I have vague plans to emulate low data rate modes of LT8910 with CC2500 it is actually a serious problem. You'll need to write for LT8900 in terms of NRF24L01_ functions and for LT8910 - in terms of CC2500_ . Dreadful, isn't it?