marceluphd / acsip-s7xg_gps-speedometer

Simple test of LilyGO T-Motion hardware circuit

T-Motion

Introduction:

Simple test of LilyGO T-Motion hardware circuit

Steps:

1. Install Visual Studio Code on your pc, Install PlatformIO in the extension, or you can install PlatformIO IDE,it's built on top of Microsoft's Visual Studio Code

2. By default, the T-Motion has been programmed with the DFU boot program. You only need to press the Boot key to insert it into the computer to view the STM BOOTLOADER in the device manager, as shown below.

3. The default serial log will use CDC output. If there is no serial output, it may be that the code in the STM32_Core warehouse has not been updated. Please replace variant/variant.cpp to C:\Users<UserName>.platformio\packages\framework-arduinoststm32\variants\NUCLEO_L073RZ , Thanks to @lyusupov for the RP submission

4. The program uses PA4 as the key input pin by default. If you do not connect it, it does not matter, because the default is only used for GPS display, LORA is only to test the transmission of LORA

5. If DFU fails, you can use Jlink or ST-Link to reprogram firmware/dfu.hex Or use Uart for downloading. When using flasher-stm32 for programming, you need to hold down the BOOT key and connect to PA9 PA10 for programming.

   Wiring diagram

   USB Bridge	UART Download	T-Motion
   RX	->	PA9
   TX	->	PA10

   Jlink/ST-Link	Download	T-Motion
   SCLK	->	SCLK
   SDIO	->	SDIO

   Pinout

   S76/78G	Pin
   SX1276/78 rst	PB10
   SX1276/78 mosi	PB15
   SX1276/78 miso	PB14
   SX1276/78 sclk	PB13
   SX1276/78 cs	PB12
   SX1276/78 dio0	PB11
   SX1276/78 dio1	PC13
   SX1276/78 dio2	PB9
   SX1276/78 dio3	PB4
   SX1276/78 dio4	PB3
   SX1276/78 dio5	PA15
   Radio switch	PA1
   Uart Tx	PA9
   Uart Rx	PA10
   GPS rst	PB2
   GPS Rx	PC11
   GPS Tx	PC10
   GPS level shifter	PC6
   GPS 1pps	PB5
   Button	PA4
   SCL	PB6
   SDA	PB7