The following documents the hardware inside the UniversalTx transceiver board
| Pin | Description |
|---|---|
| BOOT0 | CON2 |
| NRST | Debugger (NRESET) |
| 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 |
| 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 |
| 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) |
| TIM1 | PPM In pulse counter |
| TIM14 | Transmit timer |