github.com/tinygo-org/tinygo@v0.31.3-0.20240404173401-90b0bf646c27/src/machine/machine_stm32l4x2.go (about)

     1  //go:build stm32l4x2
     2  
     3  package machine
     4  
     5  // Peripheral abstraction layer for the stm32l4x2
     6  
     7  func CPUFrequency() uint32 {
     8  	return 80000000
     9  }
    10  
    11  // Internal use: configured speed of the APB1 and APB2 timers, this should be kept
    12  // in sync with any changes to runtime package which configures the oscillators
    13  // and clock frequencies
    14  const APB1_TIM_FREQ = 80e6 // 80MHz
    15  const APB2_TIM_FREQ = 80e6 // 80MHz
    16  
    17  //---------- I2C related code
    18  
    19  // Gets the value for TIMINGR register
    20  func (i2c *I2C) getFreqRange() uint32 {
    21  	// This is a 'magic' value calculated by STM32CubeMX
    22  	// for 80MHz PCLK1.
    23  	// TODO: Do calculations based on PCLK1
    24  	return 0x10909CEC
    25  }