Pin Assignments

All gpios are 0-indexed and timers, usarts and SPI interfaces are 1-indexed!
All data was read from QEMU sourcecode. It could be different on the real watches!

STM32F2xx

bb2_ev1_ev2 (classic):

• Display:
  • 148x172px
  • 2px border
  • SPI2
  • display: LS013B7DH01
  • datasheet: http://www.pebble-smartwatch.de/wp-content/uploads/2012/04/LS013B7DH01_Application_Info.pdf
  • chip select on B12, active high
  • SPI clock on B13, SPI data on B15; something unknown is on B14, but is also set up in the display GPIO init code
  • appears to use external VCOM (B1 = TIM3 ch4)
  • backlight_enable: B5 (out)
  • backlight_level: Timer3
• Flash:
  • N25Q032A11
  • SPI1
  • chip select: A4 (out)
• Clock:
  • 8MHz main clock
  • 32.768kHz RTC clock
• Debug: USART3
• Pebble Control: USART2
• Buttons:
  • Back: C3 (in)
  • Up: A4 (in)
  • Select: C6 (in)
  • Down: A1 (in)
• Vibe: B0 (out)
• Hardware Serial port on testpoints:
  • TP9: RX
  • TP10: TX
  • TP15: BOOT0 (Hardware reset)
  • TP8: GND
  • Connected to USART3

bigboard:

• Display:
  • 148x172px
  • 2px border
  • SPI2
  • backlight_enable: B5 (out)
  • backlight_level: Timer3
• Flash:
  • N25Q032A11
  • SPI1
  • chip select: A4 (out)
• Clock:
  • 8MHz main clock
  • 32.768kHz RTC clock
• Debug: USART3
• Pebble Control: USART2
• Buttons:
  • Back: A2 (in)
  • Up: A1 (in)
  • Select: A3 (in)
  • Down: C9 (in)
• Vibe: B0 (out)

STM32F439

Pebble Time Steel has hardware code "snowy_s3".

snowy (time):

For an up-to-date pinout map see here: Snowy Pinout

• Display:
  • 148x172px
  • 2px border
  • SPI6
  • display_done: G9 (in)
  • display_intn: G10 (in)
  • display_reset: G15 (out)
  • display_sclk: G13 (out)
  • display_cs: G8 (out)
  • backlight_enable: B14 (out)
  • backlight_level: Timer12
• Flash:
  • MX29VS128FB
  • uses FSMC driver in NOR
• Debug: USART3
• Smart Strap: UART8 (E1)
• Pebble Control: USART2
• CC2564 (BT): USART1 (E2,D5,D4,E1)
• Buttons:
  • Back: G4 (in)
  • Up: G3 (in)
  • Select: G1 (in)
  • Down: G2 (in)
• Vibe: F4 (out)
• PMIC:
  • I2C1
  • SCL: B6
  • SDA: B9
• Ambient Light
  • Source PA3
  • Measure PA2

s4_bb (round):

• Display:
  • 148x172px
  • 2px border
  • SPI6
  • display_done: G9 (in)
  • display_intn: G10 (in)
  • display_reset: G15 (out)
  • display_sclk: G13 (out)
  • backlight_enable: B14 (out)
  • backlight_level: Timer12
• Flash:
  • MX29VS128FB
  • ??
• Debug: USART3
• Pebble Control: USART2
• Buttons:
  • Back: G4 (in)
  • Up: G3 (in)
  • Select: G1 (in)
  • Down: G2 (in)
• Vibe: F4 (out)

STM32F412

silk:

• Display:
  • 148x172px
  • 2px border
  • SPI2
  • backlight_enable: B13 (out)
  • backlight_level: Timer3
• Flash:
  • MX25U6435F
  • QSPI
• Debug: USART3
• Pebble Control: USART2
• Buttons:
  • Back: C13 (in)
  • Up: D2 (in)
  • Select: H0 (in)
  • Down: H1 (in)
• Vibe: Timer14

STM32F7xx

robert_bb (probably Time2):

• Display:
  • 200x228px
  • no border
  • SPI6
  • chip select: A4 (out)
  • display_done: B2 (in)
  • display_intn: B0 (in)
  • display_reset: A3 (out)
  • display_sclk: A5 (out)
  • backlight_enable: G13 (out)
  • backlight_level: LPTimer1
• Flash:
  • MT25Q256
  • QSPI
• Debug: USART3
• Pebble Control: USART2
• Buttons:
  • Back: G6 (in)
  • Up: G3 (in)
  • Select: G5 (in)
  • Down: G4 (in)
• Vibe: D14 (out)