px_sysclk.c

/* =============================================================================
     ____    ___    ____    ___    _   _    ___    __  __   ___  __  __ TM
    |  _ \  |_ _|  / ___|  / _ \  | \ | |  / _ \  |  \/  | |_ _| \ \/ /
    | |_) |  | |  | |     | | | | |  \| | | | | | | |\/| |  | |   \  /
    |  __/   | |  | |___  | |_| | | |\  | | |_| | | |  | |  | |   /  \
    |_|     |___|  \____|  \___/  |_| \_|  \___/  |_|  |_| |___| /_/\_\
 
    Copyright (c) 2018 Pieter Conradie <https://piconomix.com>
 
    License: MIT
    https://github.com/piconomix/px-fwlib/blob/master/LICENSE.md
    
    Title:          px_sysclk.h : System Clock using the SysTick peripheral
    Author(s):      Pieter Conradie
    Creation Date:  2018-03-06
 
============================================================================= */
 
/* _____STANDARD INCLUDES____________________________________________________ */
 
/* _____PROJECT INCLUDES_____________________________________________________ */
#include "px_sysclk.h"
#include "px_board.h"
#include "px_stm32cube.h"
 
#if PX_SYSCLK_CFG_STMCUBE_HAL_TMR
#include "stm32l0xx_hal.h"
#endif
 
/* _____LOCAL DEFINITIONS____________________________________________________ */
 
/* _____MACROS_______________________________________________________________ */
 
/* _____GLOBAL VARIABLES_____________________________________________________ */
 
/* _____LOCAL VARIABLES______________________________________________________ */
static volatile px_sysclk_ticks_t px_sysclk_tick_counter;
 
#ifdef PX_SYSCLK_CFG_TIMEOUT_PERIOD_TICKS
static volatile px_sysclk_ticks_t px_sysclk_timeout_counter;
#endif
 
/* _____LOCAL FUNCTION DECLARATIONS__________________________________________ */
 
/* _____LOCAL FUNCTIONS______________________________________________________ */
/// SysTick interrupt handler.
void SysTick_Handler(void)
{
    // Increment counter
    px_sysclk_tick_counter++;
 
#if PX_SYSCLK_CFG_STMCUBE_HAL_TMR
#if (PX_SYSCLK_CFG_TICKS_PER_SEC != 1000)
    #error "STMCube HAL expects SysTick interval to be 1 ms"
#endif
    // Increment HAL Tick value for timeout functionality in STMCUBE HAL library
    HAL_IncTick();
#endif
 
#ifdef PX_SYSCLK_CFG_TIMEOUT_PERIOD_TICKS
    // Decrement timeout counter
    if(--px_sysclk_timeout_counter == 0)
    {
        // Reset timeout counter
        px_sysclk_timeout_counter =  PX_SYSCLK_CFG_TIMEOUT_PERIOD_TICKS;
#endif
 
#ifdef PX_SYSCLK_CFG_ON_PERIODIC_TIMEOUT
        // Call periodic timeout function
        PX_SYSCLK_CFG_ON_PERIODIC_TIMEOUT();
#endif
 
#ifdef PX_SYSCLK_CFG_TIMEOUT_PERIOD_TICKS
    }
#endif
}
 
/* _____GLOBAL FUNCTIONS_____________________________________________________ */
void px_sysclk_init(void)
{
 
   uint32_t ticks_per_period;
 
   // Calculate number of ticks per SysTick period (SysTick is fed from AHB clock by default)
   ticks_per_period = PX_UDIV_ROUND(PX_BOARD_SYS_CLK_HZ, PX_SYSCLK_CFG_TICKS_PER_SEC);
   // Configure SysTick peripheral
   SysTick_Config(ticks_per_period);
   // Enable SysTick interrupt
   NVIC_EnableIRQ(SysTick_IRQn);
 
#ifdef PX_SYSCLK_CFG_TIMEOUT_PERIOD_TICKS
    // Reset timeout counter
    px_sysclk_timeout_counter = PX_SYSCLK_CFG_TIMEOUT_PERIOD_TICKS;
#endif
}
 
px_sysclk_ticks_t px_sysclk_get_tick_count(void)
{
    return px_sysclk_tick_counter;
}
 
void px_sysclk_reset_tick_count(void)
{
    px_sysclk_tick_counter = 0;
}