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avr: added some comments.

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This commit is contained in:
Martin Preuss
2025-03-24 00:18:50 +01:00
parent 45e668ec88
commit 78fda7727a
1 changed files with 13 additions and 8 deletions
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21
avr/modules/flash/flash1p.asm
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@@ -97,10 +97,14 @@ Flash_WriteData_done:
; @clobbers R16, R18, R24, R25, X (R0, R1, R19, R20) ; @clobbers R16, R18, R24, R25, X (R0, R1, R19, R20)
flashWriteData: flashWriteData:
rcall flashCheckCurrentValid ; (r18, r19)
brcc flashWriteData_beginPage
rcall flashWriteCheckPage ; (r18, r19) rcall flashWriteCheckPage ; (r18, r19)
brcs flashWriteData_calcPosAndLength brcs flashWriteData_calcPosAndLength ; still inside current page, jump
rcall flash1pEndPage ; (R0, R1, R16, R18, R19, R20, R24, R25, X) rcall flash1pEndPage ; (R0, R1, R16, R18, R19, R20, R24, R25, X)
rcall flash1pBeginPage ; (r16, r24, r25, X, Z) flashWriteData_beginPage:
rcall flash1pBeginPage ; (r16, r24, r25, X)
flashWriteData_calcPosAndLength: flashWriteData_calcPosAndLength:
rcall flashCalcPosAndLength ; (r24, r25) rcall flashCalcPosAndLength ; (r24, r25)
; X=abs pos in buffer, r18=bytes to read, r17=bytes initially requested ; X=abs pos in buffer, r18=bytes to read, r17=bytes initially requested
@@ -131,15 +135,15 @@ flashWriteData_copyLoop:
flashCalcPosAndLength: flashCalcPosAndLength:
; calc offset into buffer ; calc offset into buffer
mov r24, zl mov r24, zl
andi r24, (FLASH_PAGESIZE-1) ; r24=rel pos inside buffer andi r24, (FLASH_PAGESIZE-1) ; r24=rel pos inside buffer
ldi r25, FLASH_PAGESIZE ldi r25, FLASH_PAGESIZE
sub r25, r24 ; r25=bytes left inside page sub r25, r24 ; r25=bytes left inside page
mov r18, r17 mov r18, r17
cp r25, r17 cp r25, r17 ; bytes to read > bytes left in page?
brcc flashCalcPosAndLength_l1 brcc flashCalcPosAndLength_l1 ; no: jump
mov r18, r25 mov r18, r25 ; yes: cut r18 to number of bytes left in page
flashCalcPosAndLength_l1: flashCalcPosAndLength_l1:
ldi xl, LOW(flashPageBuffer) ldi xl, LOW(flashPageBuffer) ; set X to pos within page buffer
ldi xh, HIGH(flashPageBuffer) ldi xh, HIGH(flashPageBuffer)
add xl, r24 add xl, r24
adc xh, r24 adc xh, r24
@@ -155,6 +159,7 @@ flashCalcPosAndLength_l1:
; check whether the given address is inside the current page in buffer ; check whether the given address is inside the current page in buffer
; ;
; @return CFLAG set if same page, cleared otherwise ; @return CFLAG set if same page, cleared otherwise
; @param Z address to write to
; @clobbers r18, r19 ; @clobbers r18, r19
flashWriteCheckPage: flashWriteCheckPage: