AtaberkOKLU / STM32-FlySky-IBus

Telemetry application over RF (2.4 GHz) using FlySky Fs-i6x and STM32 Microcontroller

Project Components

• STM32 Microcontroller
• FlySky FS - i6x (OpenI6x Software)
• FS-iA#B AFHDS2A (# : 6 or 10)

Features

• Can receive 14 Channels of the FlySky FS - i6x
• Can send up to 16 sensor measurements
• Only iBus ports are used, minimazing the pin usage
• Each Servo and Sensor iBus requires one U(S)ART peripheral (Half-Dublex)
• Every transmission and reception is handled by state machine guided DMA operations, minimazing CPU load

Documentation

• System Diagram
• Logic Analyzer Capture File
• FS-i6x Telemetry Screens

Example Project

SMT32F103C8T6 Based Example Project

• 14 Channel Servo Reception (DMA)
• 16 Channel Sensor Transmission (DMA)
• USART1 (iBus - Sensor) (Half-Dublex)
• USART2 (iBus - Servo) (Half-Dublex)
• Prints Servo Channels over SWO ITM

SystemCore

RCC

• HSE -> Crystal / Ceramic Resonator

SYS

• Debug -> Trace Asynchronous SW
• Timebase Source -> SysTick

Connectivity

USART1 (iBus - Sensor)

• Mode -> Single Wire (Half-Dublex) (Transfer and Receive)
• BoudRate -> 115200 (8N1)
• DMA_RX -> Enabled
• DMA_TX -> Enabled
• NVIC -> USART1 Global Interrupt Enabled

USART2 (iBus - Servo)

• Mode -> Single Wire (Half-Dublex) (Only Receive)
• BoudRate -> 115200 (8N1)
• DMA_RX -> Enabled

Project Manager -> Advanced Settings

• Register CallBacks -> UART -> Enabled

Project Manager -> Code Generator

• Generate peripheral initilazation as pair of .c/.h files per peripheral -> Enabled

Step-by-step Implimentation

1. OpenI6x Software for FlySky - i6x
2. Configure Microcontroller Peripherals according to Example Project
3. Copy Telemetry.c/.h Files to Inc and Src Folders
4. Add ***_UART_Telemetry_Init(&huart) Functions in USER_CODE_2 Field
5. Add Global TelemetrySensorStruct SensorList[NUM_SENSOR] Array According to iBus Sensor Types
6. Edit NUM_SENSOR @ Telemetry.h File