Module stm32f3xx_hal::rcc

Reset and Clock Control

The most important function this module delivers is the clock configuration.

To configure the clock, we first have to obtain the device peripherals.

// Get our peripherals
let dp = pac::Peripherals::take().unwrap();

let mut flash = dp.FLASH.constrain();
let mut rcc = dp.RCC.constrain();

After that we can configure the clock

let clocks = rcc.cfgr
    // Using the external oscillator
    // Set the frequency to that of the external oscillator
    .use_hse(8.MHz())
    // Set the frequency for the AHB bus,
    // which the root of every following clock peripheral
    .hclk(48.MHz())
    // The sysclk is equivalent to the core clock
    .sysclk(48.MHz())
    // The following are peripheral clocks, which are both
    // needed to configure specific peripherals.
    // Looking at the peripheral function parameters
    // should give more insight, which peripheral clock is needed.
    .pclk1(12.MHz())
    .pclk2(12.MHz())
    // Freeze / apply the configuration and setup all clocks
    .freeze(&mut flash.acr);

All fields can be omitted and will internally be set to a calculated default. For more details read the documentation of the CFGR methods to find out how to setup the clock.

Structs

• AHB
  AMBA High-performance Bus (AHB) registers
• APB1
  Advanced Peripheral Bus 1 (APB1) registers
• APB2
  Advanced Peripheral Bus 2 (APB2) registers
• BDCR
  Backup Domain Control register (RCC_BDCR)
• CFGR
  Clock configuration
• Clocks
  Frozen clock frequencies
• Rcc
  Constrained RCC peripheral

Constants

• HSI
  Frequency of interal hardware RC oscillator (HSI OSC)
• LSE
  Frequency of external 32.768 kHz oscillator (LSE OSC)

Traits

• BusClock
  Frequency on bus that peripheral is connected in
• BusTimerClock
  Frequency on bus that timer is connected in
• Enable
  Enable/disable peripheral
• RccBus
  Bus associated to peripheral
• RccExt
  Extension trait that constrains the []RCC] peripheral
• Reset
  Reset peripheral