Bootstrap and definition library for programming STM32L100RC in ARM assembler. This was a class project to learn ARM assembly
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stm32l100-asm-bootstrap/lib/INI_SYSTICK.s

64 lines
2.6 KiB

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