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avr: added guarded ringbuffer routines

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This commit is contained in:
Martin Preuss
2025-02-13 01:10:15 +01:00
parent 2a776ca895
commit bcc7194254
1 changed files with 81 additions and 0 deletions
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81
avr/common/ringbuffer_y.asm
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@@ -115,3 +115,84 @@ RingBufferY_Reset:
; ---------------------------------------------------------------------------
; @routine RingBufferY_ReadByteGuarded
;
; @return CFLAG on success, cleared on error
; @param r16 byte to write
; @param Y pointer to start of interface data
; @clobbers R17, R18, X
RingBufferY_ReadByteGuarded:
push r15
in r15, SREG
cli
rcall RingBufferY_ReadByte ; R17, R18, X
brcc RingBufferY_ReadByteGuarded_error
out SREG, r15
pop r15
sec
ret
RingBufferY_ReadByteGuarded_error:
out SREG, r15
pop r15
clc
ret
; @end
; ---------------------------------------------------------------------------
; @routine RingBufferY_PeekByteGuarded
;
; @return CFLAG on success, cleared on error
; @param r16 byte to write
; @param Y pointer to start of interface data
; @clobbers R17, R18, X
RingBufferY_PeekByteGuarded:
push r15
in r15, SREG
cli
rcall RingBufferY_PeekByte ; R17, R18, X
brcc RingBufferY_PeekByteGuarded_error
out SREG, r15
pop r15
sec
ret
RingBufferY_PeekByteGuarded_error:
out SREG, r15
pop r15
clc
ret
; @end
; ---------------------------------------------------------------------------
; @routine RingBufferY_WriteByteGuarded
;
; @return CFLAG on success, cleared on error
; @param r16 byte to write
; @param Y pointer to start of interface data
; @clobbers R17, R18, X
RingBufferY_WriteByteGuarded:
push r15
in r15, SREG
cli
rcall RingBufferY_WriteByte ; R17, R18, X
brcc RingBufferY_WriteByteGuarded_error
out SREG, r15
pop r15
sec
ret
RingBufferY_WriteByteGuarded_error:
out SREG, r15
pop r15
clc
ret
; @end