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hardware:universaltx

UniversalTx Hardware Connections

The following documents the hardware inside the UniversalTx transceiver board

  • MCU: STM32F072RB 128kB Flash, 16kB RAM 48pin package
  • Radio:
    • CYRF6936 2.4GHz
    • CC2500 2.4GHz
    • A7105 2.4GHz
    • NRF24L01 2.4GHz

STM32 Connections

Pin Description
BOOT0 CON2
NRST Debugger (NRESET)

GPIOA

Pin Description
0 PPMin/USART4 (can be used as single-wire bi-di)
1 PA Enable input from NRF24L01
2 Bluetooth UART Tx
3 Bluetooth UART Rx
4 Bluetooth STATE input (connection detect)
7 Bluetooth Key output
8 UniversalTx CSN
9 CYRF6936 CSN
10 USB D-
11 USB D+
12 SWDIO
13 SWCLK
14 (SWCLK) Debugger SWCLK (TCK)
15 Mux Select 1

GPIOB

Pin Description
2 BOOT1
3 Mux Select 2
6 NRF24L01 CSN
7 VBUS (USB Power Detect)
8 NRF24L01 ChipEnable
9 A7105 CSN
10 PA Tx Enable
11 PA Rx Enable
12 Pasthrough CSN input
13 SCK
14 MISO
15 MOSI

Interrupt usage

SYSTICK Priority 0
EXTI0 Pritority128 - PPM In edge detect
EXTI2 Priority 0 - Watchdog (currently not enabled)
TIM14 Priority 64 - Transmit timer
EXTI8 Priority 0 - UniversalTx CSN
EXTI12 Priority 0 - Passthrough CSN
ADC Priority 0 - ADC compare complete (set PA Tx/Rx based on NRF24L01 PA_EN)

Timers

TIM1 PPM In pulse counter
TIM14 Transmit timer
hardware/universaltx.txt (4407 views) · Last modified: 2016/04/16 12:27 by FDR