@VRquaeler
I have a small confusion. Wiki page mentions:
/// If you are making your own adapter board for the HM-TRP, note that
/// whilst the stock firmware requires the ENABLE pin be tied low,
/// it is a flow control input to the SiK radio firmware.
///
/// Also, the CONFIG pin is a flow control output, and a series resistor
/// of at least 33 ohms must be placed in series with it to avoid damage
/// to the Si1000 when it is jumpered low to force bootloader entry.
I have a 3DR module and I checked, enable pin is not grounded.
Not sure if I should connect it to gnd.
No, you should not connect the âconfigâ pin to ground. Itâs only (temporarily) needed if you want it to force the module in boot loader mode. One possible reason is a bad firmware flash.
For me it sounds like: The enable pin can be used for (hardware) flow control. I have not done hardware flow control for years. May be back in the APM 8bit days The software flow control (via the tx buffer) is good enough for my needs.
So you didnât connect enable to gnd?
I thought so too since my 3dr module also doesnât have enable connected to gnd.
HM-TRP manual says that connecting it to low, keeps it working normally and setting it to high puts it in sleep mode.
If I remember correctly this was the case of the genuine âHM-TRPâ firmware. With the Sik-firmware we have something way better/more useful for our purposes.