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VGA demo on bluepill (using STM32F103 microcontroller)

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stm32f103-vga-rs

VGA demo on STM32F103 "bluepill"

Board

Overview

The STM32F103 is a Cortex-M3 microcontroller that has neither a video controller, nor enough RAM for a framebuffer at any reasonable resolution.

This demo works around this to produce an acceptable quality 800x600 video with 64 colors to display 364x296 pixels. It uses three timers and a GPIO port.

Screenshot

How to connect wires

PIN Description Connect To Output
PB08 Red 1 Resistor 680 Ohm VGA red (1)
PB09 Red 2 Resistor 470 Ohm VGA red (1)
PB12 Green 1 Resistor 680 Ohm VGA green (2)
PB13 Green 2 Resistor 470 Ohm VGA green (2)
PB14 Blue 1 Resistor 680 Ohm VGA blue (3)
PB15 Blue 2 Resistor 470 Ohm VGA blue (3)
PB0 HSync VGA HSync (13)
PB6 VSync VGA VSync (14)
PA0 CLK Resistor 2K2 to keyboard CLK and resistor 3K3 to GND
PA1 DATA Resistor 2K2 to keyboard DATA and resistor 3K3 to GND
G Ground VGA Ground (5,6,7,8,10)

How to build

I recommend following the setup chapters from the Rust Embedded book. In particular, you need to have Rust and you need to make Rust aware of the cross compilation target we're using here:

$ rustup target add thumbv7m-none-eabi

You will also need a GNU ARM toolchain to compile the assembly language routine.

Now you should be able to compile everything by entering:

$ cargo build --release

Note: on Windows there's currently an issue rust-embedded/cortex-m-rt#80.

Implementation Details

  • Timer TIM4 is used to generate vertical sync signal
  • Timer TIM2 is used as a "shock absorber" to make the VGA stable
  • Timer TIM3 is used to generate horizontal sync signal

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VGA demo on bluepill (using STM32F103 microcontroller)

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