;****************************************************************************
; 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