50 lines
945 B
Markdown
50 lines
945 B
Markdown
# Blue Pill Notes
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## Baseline
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- Board: STM32F103C8T6 Blue Pill
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- Core: Cortex-M3
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- Default target: `thumbv7m-none-eabi`
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## LED
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- Most Blue Pill boards wire the onboard LED to `PC13`
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- It is usually active-low
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- `set_low()` usually turns it on
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- `set_high()` usually turns it off
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## RGB LED
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- `PA5` = red
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- `PA6` = green
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- `PA7` = blue
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- `PA4` = drive low for the LED return path
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## 5-Way Button Board
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- `PB12` = GND, drive low
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- `PA10` = VCC, drive high
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- `PB13` = right
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- `PB14` = down
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- `PB15` = left
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- `PA8` = center
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- `PA9` = up
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- Assumption: the button inputs read high when pressed
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- The button examples use `PA8` as the default center button
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- TODO: flip the input polarity if your module is active-low instead
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## HMC5883L Module
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- `PB4` = VCC, drive high
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- `PB5` = GND, drive low
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- `PB6` = SCL
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- `PB7` = SDA
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- `PB8` = DRDY
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## Probe Wiring
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- `SWDIO` -> `SWDIO`
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- `SWCLK` -> `SWCLK`
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- `GND` -> `GND`
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- `3V3` -> `3V3` reference
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