~~TOC:3-4~~
===== Devo F4 Hardware Connections =====

The following documents the hardware inside the Devo-F4 transmitter

  * MCU: [[http://www.st.com/internet/mcu/product/164492.jsp|STM32F103RBT6]] 128kB Flash, 20kB RAM 64pin package
  * SPI Flash: [[http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCwQFjAA&url=http%3A%2F%2Fwww.pctgroup.com.tw%2Fattachments%2Ffiles%2Ffiles%2F255_25VF512A-P.pdf&ei=LN2wUq6YDc7uoASrj4GYCw&usg=AFQjCNEUobGRb267XLDjKSpEVCCPasoWEA&sig2=qGo-PDtnqvy7ccj1-U3xaA&bvm=bv.58187178,d.cGU|PCT25VF512A]] 64kB SPI NOR Flash
  * Video Overlay: [[https://www.deviationtx.com/media/kunena/attachments/1498/IA9211.pdf|IA9211]]
  * Radio: [[http://www.cypress.com/?docID=28606|CYRF6936]] 2.4GHz
 

==== STM32 Connections ====

**NOTE: These are from the Devo-7e.  they may need to be updated! '*' Indiciates updated values**

^Pin    ^Desription         ^
|BOOT0  |CON2               |
|NRST   |Debugger (NRESET)  |

=== GPIOA ===
^Pin             ^Desription                                           ^
|*0              |5.8GHz Receiver channel0 pin                         |
|1               |Piezo speaker                                        |
|2               |output to 0 to shut off Tx                           |
|3               |power-switch in 'off' position (goes high on 'off')  |
|*4              |5.8GHz signal strength                               |
|5 (SPI1_SCK)    |SPI Flash, LCD                                       |
|6 (SPI1_MISO)   |SPI Flash, LCD                                       |
|7 (SPI1_MOSI)   |SPI Flash, LCD                                       |
|*8              |5.8GHz Receiver channel1 pin                         |
|9 (USART1_TX)   |Trainer Rx?                                          |
|10 (USART1_RX)  |Trainer Tx?                                          |
|11 (USBDM)      |USB+                                                 |
|12 (USBDP)      |USB-                                                 |
|13 (SWDIO)      |Debugger SWDIO (TMS)                                 |
|14 (SWCLK)      |Debugger SWCLK (TCK)                                 |
|*15             |5.8GHz Receiver channel2 pin                         |

=== GPIOB ===
^Pin              ^Desription                        ^
|0                |LCD Chip Enable                   |
|1                |LCD Backlight                     |
|2 (BOOT1)        |SPI Flash Chip-Enable             |
|*3               |Mix0 Switch                       |
|*4               |Mix2 Switch                       |
|5                |Button Matrix Col 1               |
|6                |Button Matrix Col 2               |
|7                |Button Matrix Col 3               |
|8                |Button Matrix Col 4               |
|9                |5.8GHz Receiver on/off            |
|10               |USB Enable (enable Low)           |
|11               |TxModule pin 10 - CYRF6936 Reset  |
|12 (SPI2_NSS?)   |TxModule pin 1                    |
|13 (SPI2_SCK?)   |TxModule pin 3                    |
|14 (SPI2_MISO?)  |TxModule pin 9                    |
|15 (SPI2_MOSI?)  |TxModule pin 7                    |

=== GPIOC ===
^Pin            ^Desription              ^
|0 (ADC_IN_10)  |Right Vertical Stick    |
|1 (ADC_IN_11)  |Left Vertical Stick     |
|2 (ADC_IN_12)  |Left Horizontal stick   |
|3 (ADC_IN_13)  |Right Horizontal Stick  |
|4 (ADC_IN_14)  |Battery Voltage         |
|5              |LCD Data/Command mode   |
|6              |Button Matrix Row 1     |
|7              |Button Matrix Row 2     |
|8              |Button Matrix Row 3     |
|9              |Button Matrix Row 4     |
|10             |FMode2 Switch           |
|11             |FMode0 Switch           |
|*12            |Hold Switch             |
|13             |AIL DR Switch           |
|14             |Gear Swicth             |
|*15            |TRN Switch              |

=== GPIOD ===
^Pin  ^Desription              ^
|2    |Haptic vibration motor  |

**The battery voltage (ADC1_14) is calculated by the formula:** \\
V = 0.0021x + 0.3026

=== Button Matrix ===
|     ^B.5          ^B.6          ^B.7          ^B.8          ^
^C.6  |L-           |DN-          |Aileron TL   |Throttle TD  |
^C.7  |R+           |UP+          |Aileron TR   |Elevator TD  |
^C.8  |Ent          |Ext          |Rudder TL    |Throttle TU  |
^C.9  |NC           |NC           |Rudder TR    |Elevator TU  |


**TL:** Trim Left
**TR:** Trim Right
**TU:** Trim Up
**TD:** Trim down

==== FCC Report ====
FCCID: [[https://www.fcc.gov/general/fcc-id-search-page|S29 DEVO-F4]]

Schematic available here courtesy of user Buoncristiani:
{{:hardware:schemadevof4v2.pdf|}}

==== Switch MOD for DEVO F4 ====

see [[https://www.deviationtx.com/forum/7-development/4976-deviation-for-devo-f4?start=240#47013|this post]]