69 lines
2.7 KiB
ArmAsm
69 lines
2.7 KiB
ArmAsm
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;* ----------------------------------------------------------------------------
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;* -- _____ ______ _____ -
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;* -- |_ _| | ____|/ ____| -
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;* -- | | _ __ | |__ | (___ Institute of Embedded Systems -
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;* -- | | | '_ \| __| \___ \ Zurich University of -
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;* -- _| |_| | | | |____ ____) | Applied Sciences -
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;* -- |_____|_| |_|______|_____/ 8401 Winterthur, Switzerland -
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;* ----------------------------------------------------------------------------
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;* --
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;* -- Project : CT1 - Lab 12
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;* -- Description : Common procedures
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;* --
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;* -- $Id: utils.s 1244 2015-02-03 10:12:17Z ruan $
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;* ----------------------------------------------------------------------------
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; -----------------------------------------------------------------------------
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; -- Constants
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; -----------------------------------------------------------------------------
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AREA myCode, CODE, READONLY
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THUMB
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; -----------------------------------------------------------------------------
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; Set bit of a register (SFR, word -> 32 bit)
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; - Address of register in R6
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; - Bits to be set in R7
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; -----------------------------------------------------------------------------
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set_sfr PROC
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EXPORT set_sfr
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PUSH {LR}
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LDR R2, [R0] ; Load register value to R0
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ORRS R2, R2, R1 ; Set bits
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STR R2, [R0] ; Store new register value
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POP {PC} ; Restore registers and return
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ENDP
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; -----------------------------------------------------------------------------
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; Clear all bits of a register (SFR, word -> 32 bit)
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; - Address of register in R0
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; - Bits to be cleared in R1
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; -----------------------------------------------------------------------------
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clear_sfr PROC
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EXPORT clear_sfr
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PUSH {LR}
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LDR R2, [R0] ; Load register value to R0
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BICS R2, R2, R1 ; Clear bits
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STR R2, [R0] ; Store new register value
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POP {PC} ; Restore registers and return
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ENDP
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; -----------------------------------------------------------------------------
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; -- End of file
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; -----------------------------------------------------------------------------
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END
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