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50 lines
2.1 KiB
50 lines
2.1 KiB
;****************************************************************************
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;*
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;* REGISTERS
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;*
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;****************************************************************************
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SYSTICK_BASE EQU 0xE000E010
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SYSTICK_CR EQU (SYSTICK_BASE + 0x010) ; (R/W) SysTick Control and Status Register
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SYSTICK_RELOAD EQU (SYSTICK_BASE + 0x014) ; (R/W) SysTick Reload Value Register
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SYSTICK_VAL EQU (SYSTICK_BASE + 0x018) ; (R/W) SysTick Current Value Register
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SYSTICK_CALIB EQU (SYSTICK_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_CR register ****************
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SYSTICK_CR_ENABLE EQU 0x00000001 ; Counter enable
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SYSTICK_CR_ENABLE_ofs EQU 0
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SYSTICK_CR_ENABLE_len EQU 1
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SYSTICK_CR_TICKINT EQU 0x00000002 ; Enable interrupt when counter reaches zero
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SYSTICK_CR_TICKINT_ofs EQU 1
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SYSTICK_CR_TICKINT_len EQU 1
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SYSTICK_CR_CLKSOURCE EQU 0x00000004 ; Clock source (0 - clock div 8, 1 - core clock)
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SYSTICK_CR_CLKSOURCE_ofs EQU 2
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SYSTICK_CR_CLKSOURCE_len EQU 1
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SYSTICK_CR_COUNTFLAG EQU 0x00010000 ; Count Flag (only if interrupt is disabled)
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SYSTICK_CR_COUNTFLAG_ofs EQU 16
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SYSTICK_CR_COUNTFLAG_len EQU 1
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; masks
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SYSTICK_RELOAD_MASK EQU 0x00FFFFFF ; Reload value used when the counter reaches 0
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SYSTICK_VAL_MASK EQU 0x00FFFFFF ; Current value at the time the register is accessed
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; systick calib (according to datasheet)
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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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