embedded_stm32f0xx

Usage

First edit your alire.toml file and add the following elements:

• Add embedded_stm32f0xx in the dependency list:

  [[depends-on]]
  embedded_stm32f0xx = "*"
  

• if applicable, apply any runtime configuration variables (see below).

Then edit your project file to add the following elements:

• "with" the run-time project files. With this, gprbuild will compile the run-time before your application

  with "runtime_build.gpr";
  with "ravenscar_build.gpr";
  

• Specify the Target and Runtime attributes:

     for Target use runtime_build'Target;
     for Runtime ("Ada") use runtime_build'Runtime ("Ada");
  

• specify the Linker switches:

  package Linker is
    for Switches ("Ada") use Runtime_Build.Linker_Switches;
  end Linker;
  

The runtime is configurable via Alire crate configuration variables. See the project website for full details of the available options.

By default, the runtime is configured for the STM32F072RB. If your board has a different MCU, then you will need to specify which MCU you are using via the crate configuration. For example, to configure the runtime for the STM32F030F4, add the following to your alire.toml:

[configuration.values]
embedded_stm32f0xx.MCU_Sub_Family            = "F030"
embedded_stm32f0xx.MCU_Pin_Count             = "F"
embedded_stm32f0xx.MCU_User_Code_Memory_Size = "4"

By default, the runtime configures the clock tree for a 48 MHz system clock from the high-speed internal (HSI) oscillator. If you want a different clock configuration, then use the crate configuration variables to specify the configuration you wish to use. For example, to configure the runtime to generate a 32 MHz system clock from a 16 MHz HSE crystal oscillator:

[configuration.values]
# Configure a 16 MHz HSE crystal oscillator
embedded_stm32f0xx.HSE_Clock_Frequency = 16000000
embedded_stm32f0xx.HSE_Bypass = false

# Use the PLL as the SYSCLK source
embedded_stm32f0xx.SYSCLK_Src = "PLL"

# Configure the PLL input for a 16 MHz input from the HSE
embedded_stm32f0xx.PLL_Src = "HSE_PREDIV"
embedded_stm32f0xx.PREDIV = 1

# Configure the PLL to output 32 MHz (16 MHz * 2)
embedded_stm32f0xx.PLLMUL = 2

# Configure the AHB an APB to also run at 32 MHz
embedded_stm32f0xx.AHB_Pre = "DIV1"
embedded_stm32f0xx.APB_Pre = "DIV1"