~~TOC:3-4~~
===== Radiolink AT9 Hardware Connections =====
The following documents the hardware inside the Radiolink AT9 transmitter

  * MCU: [[http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN1565/PF164491|STM32F103VET6]] 512kB Flash, 64kB RAM 100pin package
  * EEPROM: [[http://www.giantec-semi.com/upload/datasheet/GT24C128A_DS_Adv.pdf|GT24C128A]] 128K-bit I2C SERIAL EEPROM
  * LCD Display: FPC-SJ28N-19VOF
  * LCD Driver: ILI9341 based 320x240x16bit display
  * Radio: CC2533F96 96-KB Flash, 6-KB RAM with RFX2401 driver
  * DC/DC converter: MC34063A

==== STM32 Connections ====
^Pin     ^Connection  ^Description           ^Additional Info^
|BOOT0   |BOOT0       |                      |               |

=== GPIOA ===
^Pin     ^Connection  ^Description           ^Additional Info^
|PA00    | CH1        | SRH RIght Hor Stick  | |
|PA01    | CH2        | SLV Left Ver Stick   | |
|PA02    | CH3        | SRV Right Ver Stick  | |
|PA03    | CH4        | SLH Left Hor Stick   | |
|PA04    | POT        | Right Shoulder       | |
|PA05    | POT        | Left Front Dial      | |
|PA06    | POT        | Right Front Dial     | |
|PA08    | K8H        | 2-pos switch         | RC filter |
|PA09    | TX         | Boot connector       | |
|PA10    | RX         | Boot connector       | |
|PA13    | LED Green  |                      | To cathode through limiting resistor |
|PA14    | ENTER      | Menu button          | 1K resistor to GND |
|PA15    | EXIT       | Menu button          | 1K resistor to GND |

=== GPIOB ===
^Pin     ^Connection  ^Description           ^Additional Info^
|PB00    | POT        | Left Shoulder        | |
|PB01    | LOWBAT     | Battery Voltage      | |
|PB03    | TRL        | Right Trim Left      | |
|PB04    | TRR        | Right Trim Right     | |
|PB05    | TLU        | Left Trim Up         | |
|PB06    | TLD        | Left Trim Down       | |
|PB07    | PC OUT     | PCM port             | 4.7K limiting resistor |
|PB08    | PC IN      | PCM port             | 4.7K limiting resistor |
|PB09    | DISP24     | PWM for LEDs         | Transistor to GND |
|PB11    | REST       | RF board             | |
|PB12    | CSN        | RF board             | |
|PB13    | SCK        | RF board             | |
|PB14    | MISO       | RF board             | |
|PB15    | MOSI       | RF board             | |

=== GPIOC ===
^Pin     ^Connection  ^Description           ^Additional Info^
|PC00    | K1A        | 2-pos switch         |  |
|PC01    | K2B        | 2-pos switch         |  |
|PC02    | K3C1       | 3-pos switch         |  |
|PC03    | K3C2       | 3-pos switch         |  |  
|PC04    | K5E1       | 3-pos switch         |  | 
|PC05    | K5E2       | 3-pos switch         |  |  
|PC06    | K4D        | 2-pos switch         | RC filter |
|PC07    | K6F        | 2-pos switch         | RC filter |
|PC08    | K7G1       | 3-pos switch         | RC filter |
|PC09    | K7G2       | 3-pos switch         | RC filter |
|PC10    | SDA        | EEPROM               |  | 
|PC11    | SCL        | EEPROM               |  |   
|PC12    | VIBRATOR   |                      | Transistor |
|PC13    | ENC L      | Rotary Encoder       | 10K pull-up |
|PC14    | ENC R      | Rotary Encoder       | 10K pull-up |
|PC15    | ENC Button | Rotary Encoder       | Direct to pin |

=== GPIOD ===
^Pin     ^Connection  ^Description           ^Additional Info^
|PD00    | DISP5      | Data                 |  |    
|PD01    | DISP6      | Data                 |  | 
|PD02    | TRU        | Right Trim Up        |  |
|PD03    | TRD        | Right Trim Down      |  |
|PD04    | DISP21     | Control              |  |
|PD05    | DISP22     | Control              |  |
|PD07    | DISP20     | Control              |  |
|PD06    | USB Detect | Detect USB Plugin    |  |
|PD08    | DISP16     | Data                 |  |
|PD09    | DISP17     | Data                 |  |
|PD10    | DISP18     | Data                 |  | 
|PD11    | DISP23     | Control              |  |
|PD12    | TLL        | Left Trim to Left    |  |
|PD13    | TLR        | Left Trim to Right   |  |
|PD14    | DISP3      | Data                 |  |   
|PD15    | DISP4      | Data                 |  |   

=== GPIOE ===
^Pin     ^Connection  ^Description           ^Additional Info^
|PE00    | DISP19     | RESx ILI9341 Pin     | Reset is Active low  |
|PE01    | LED Red    |                      | To cathode through limiting resistor |
|PE02    | BUZZER     |                      | Transistor | 
|PE07    | DISP7      | Data                 |  |   
|PE08    | DISP8      | Data                 |  |
|PE09    | DISP9      | Data                 |  |
|PE10    | DISP10     | Data                 |  |
|PE11    | DISP11     | Data                 |  |
|PE12    | DISP12     | Data                 |  |
|PE13    | DISP13     | Data                 |  |
|PE14    | DISP14     | Data                 |  |
|PE15    | DISP15     | Data                 |  |

=== Battery Voltage Measurement ===
The battery voltage (ADC1_9) was measured as:
^ Voltage ^ ADC Value ^
| 15.05V  | 0x0FFB    |
| 10.02V  | 0x0A9D    |
|  4.31V  | 0x048E    |

is calculated by the formula: 
V = 0.003672 * value + 0.0287

=== FCC Report ===
FCCID: [[https://www.fcc.gov/general/fcc-id-search-page| U2B RL039AT9]]