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64 lines
2.6 KiB
64 lines
2.6 KiB
;****************************************************************************
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; FILE : INI_SYSTICK.S
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; AUTHOR : Petr Dousa, Ondrej Hruska
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; DATE : 10/2015
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; DESCR : Control registers and bit masks for SysTick
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;
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; System Timer (SysTick)
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;
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; Part of an assembler library for STM32L100, based on the STM32 CMSIS.
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; Developed for educational purposes at the Department of Measure of CTU in Prague.
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; See the LICENSE file for detailed terms of use.
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;****************************************************************************
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;****************************************************************************
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;*
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;* REGISTERS
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;*
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;****************************************************************************
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SysTick_CSR EQU (_SCS_BASE + 0x010) ; (R/W) SysTick Control and Status Register
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SysTick_RELOAD EQU (_SCS_BASE + 0x014) ; (R/W) SysTick Reload Value Register
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SysTick_VAL EQU (_SCS_BASE + 0x018) ; (R/W) SysTick Current Value Register
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SysTick_CALIB EQU (_SCS_BASE + 0x01C) ; (R/ ) SysTick Calibration Value Register
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;****************************************************************************
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;*
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;* BIT MASKS AND DEFINITIONS
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;*
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;****************************************************************************
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;**************** Bit definition for SysTick_CSR register ****************
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SysTick_CSR_ENABLE EQU 0x00000001 ; Counter enable
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SysTick_CSR_TICKINT EQU 0x00000002 ; Enable interrupt when counter reaches zero
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SysTick_CSR_CLKSOURCE EQU 0x00000004 ; Clock source (0 - external, 1 - core clock)
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SysTick_CSR_CLKSOURCE_CORE EQU 0x00000004 ; Clock source - core clock
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SysTick_CSR_CLKSOURCE_DIV8 EQU 0x00000000 ; Clock source - core clock / 8
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SysTick_CSR_COUNTFLAG EQU 0x00010000 ; Count Flag (only if interrupt is disabled)
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;**************** Bit definition for SysTick_LOAD register ****************
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SysTick_RELOAD_MASK EQU 0x00FFFFFF ; Reload value used when the counter reaches 0
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;**************** Bit definition for SysTick_VAL register *****************
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SysTick_VAL_MASK EQU 0x00FFFFFF ; Current value at the time the register is accessed
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;**************** Bit definition for SysTick_CALIB register ***************
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SysTick_CALIB_TENMS EQU 0x00FFFFFF ; Reload value to use for 10ms timing
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SysTick_CALIB_SKEW EQU 0x40000000 ; Calibration value is not exactly 10 ms
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SysTick_CALIB_NOREF EQU 0x80000000 ; The reference clock is not provided
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END
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