rust-stm32/docs/hardware/blue-pill.md

Blue Pill Notes

Baseline

• Board: STM32F103C8T6 Blue Pill
• Core: Cortex-M3
• Default target: thumbv7m-none-eabi

LED

• Most Blue Pill boards wire the onboard LED to PC13
• It is usually active-low
• set_low() usually turns it on
• set_high() usually turns it off

RGB LED

• PA0 = GND, drive low
• PA1 = red
• PA2 = green
• PA3 = blue
• The RGB fade example uses software PWM on PA1, PA2, and PA3

5-Way Button Board

• PB12 = GND, drive low
• PA10 = VCC, drive high
• PB13 = right
• PB14 = down
• PB15 = left
• PA8 = center
• PA9 = up
• Assumption: the button inputs read high when pressed
• The button examples use PA8 as the default center button
• TODO: flip the input polarity if your module is active-low instead

HMC5883L Module

• PB4 = VCC, drive high
• PB5 = GND, drive low
• PB6 = SCL
• PB7 = SDA
• PB8 = DRDY

Probe Wiring

• SWDIO -> SWDIO
• SWCLK -> SWCLK
• GND -> GND
• 3V3 -> 3V3 reference