Steins7
34fb4dac76
This function used to return the raw current value, but that exposes the prescaling used internaly
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/** @file stk.h
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* Module handling the system timer (systick or STK for short)
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*
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* The module provides functions to configure and use the system timer embedded
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* in the cortex m core
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*/
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#ifndef _STK_H_
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#define _STK_H_
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//--includes--------------------------------------------------------------------
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#include <stdint.h>
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//--type definitions------------------------------------------------------------
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typedef void (*StkCallback)(void);
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//--functions-------------------------------------------------------------------
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/**
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* Configures the system timer to run at the specified period in µs and call the
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* given callback when said period is reached. Due to the limited configuration
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* options, 1.8s is the maximum period when running in speed preset (see rcc
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* module). The maximum period can be substantially increased by reducing the
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* core clock
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*/
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uint32_t stk_configure(uint32_t period_us, StkCallback cb);
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/**
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* Resets the system timer configuration, restoring the default configuration
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* and stopping it
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*/
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void stk_reset(void);
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/**
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* Starts the system timer. The timer will run until stopped
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*/
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void stk_start(void);
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/**
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* Stops the system timer
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*/
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void stk_stop(void);
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/**
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* Read the current value of the timer's counter in µs
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*/
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uint32_t stk_read_us(void);
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#endif //_STK_H_
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