STM32 programming SPI for Si4432 transceiver

Si4432 transceiver

Using FTDI as power source

Before anything, if you are using STM32 with ST-Link, then MCU and Si4432 is powered by ST-Link. When done with programming, you can use USB FTDI adapter as power source for 3.3V, but first move jumper from 5V to 3.3V (!). Else you can damage both, MCU and SI4432. On block diagram, this wire connection is not shown for reason that some FTDI adapter has voltage selection on bottom side, then you need to solder jumper pads to 3.3V. Here is picture with recommended setting for FTDI for use on your computer and for powering MCU with Si4432:



To get it working properly, when typing into console, console should be able to send LF and/OR CR symbol (decimal 10 or 13), so rather use HTerm, it is free for Windows and Linux. Do not use both CR and LF (CR-LF), else one of those may be sent over the radio and at receiving site one may notice moving text two rows instead one. Here is screenshot:


Default setting in ‘printMsg.c’ is 115200 baud, but you can change to your value, just comment with ‘//’ this one and un-comment (remove ‘//’) one that is the best for you. If you chose less than 9600, then whole thing will be slower than transceiver. In HTerm, there is window with COM port, if it is already open, it will NOT refresh automatically new COM port, you need to click on ‘R’ button next to window with COM port names. Enable “Newline at” and chose LF, you may disable “Show newline characters”.

Codes for remote controller

The codes below is for remote terminal, for communication between two points at fixed frequency and fixer data rate in bauds. For remote controller, the code must be modified. I will do that too, but not sure how soon. If you want it sooner, please buy me a beer. 😀  Just because I have many things to do at once, and sometimes long time may pass between page update. This will kick me to do more.