101 lines
2.6 KiB
NASM
101 lines
2.6 KiB
NASM
; ***************************************************************************
|
|
; copyright : (C) 2025 by Martin Preuss
|
|
; email : martin@libchipcard.de
|
|
;
|
|
; ***************************************************************************
|
|
; * This file is part of the project "AqHome". *
|
|
; * Please see toplevel file COPYING of that project for license details. *
|
|
; ***************************************************************************
|
|
|
|
#ifndef AQH_AVR_COMMON_EEPROM_W_H
|
|
#define AQH_AVR_COMMON_EEPROM_W_H
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; Utils_WriteEepromIncr
|
|
;
|
|
; Write a byte to EEPROM (see example in ATtiny24/44/84 manual p.18).
|
|
;
|
|
; @param R16 byte to write
|
|
; @param X EEPROM Address to write to
|
|
; @return CFLAG set if data written, cleared on error
|
|
; @clobbers R17
|
|
|
|
Eeprom_WriteByte:
|
|
mov r17, r16
|
|
rcall Eeprom_CheckAddr ; (r16)
|
|
mov r16, r17
|
|
brcs Eeprom_WriteByte_addrOk
|
|
ret
|
|
Eeprom_WriteByte_addrOk:
|
|
; call routine with IRQs disabled
|
|
push r15
|
|
inr r15, SREG
|
|
cli
|
|
rcall Eeprom_WriteByte_noirq
|
|
outr SREG, r15
|
|
pop r15
|
|
sec
|
|
ret
|
|
Eeprom_WriteByte_noirq:
|
|
; wait for EEPROM to be ready
|
|
Eeprom_WriteByte_waitLoop:
|
|
.ifdef EEPE
|
|
sbic EECR, EEPE ; wait for previous write to complete (if any)
|
|
.else
|
|
sbic EECR, EEWE ; wait for previous write to complete (if any)
|
|
.endif
|
|
rjmp Eeprom_WriteByte_waitLoop
|
|
; write data
|
|
.ifdef EEPM1
|
|
ldi r17, (0<<EEPM1) | (0<<EEPM0) ; set programming mode
|
|
.endif
|
|
out EECR, r17
|
|
out EEARH, xh ; set EEPROM address
|
|
out EEARL, xl
|
|
out EEDR, r16 ; write data to data register
|
|
.ifdef EEMPE
|
|
sbi EECR, EEMPE ; write logical one to EEMPE
|
|
.else
|
|
sbi EECR, EEMWE ; write logical one to EEMWE
|
|
.endif
|
|
.ifdef EEPE
|
|
sbi EECR, EEPE ; start EEPROM write by setting EEPE
|
|
.else
|
|
sbi EECR, EEWE ; start EEPROM write by setting EEWE
|
|
.endif
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine Eeprom_WriteByteIfChanged @global
|
|
;
|
|
; Only write EEPROM byte if changed from current value (save on write cycles)
|
|
;
|
|
; @param r16 byte to write
|
|
; @param X eeprom address to write to
|
|
; @clobbers r17
|
|
|
|
Eeprom_WriteByteIfChanged:
|
|
mov r17, r16
|
|
rcall Eeprom_ReadByte
|
|
brcc Eeprom_WriteByteIfChanged_end
|
|
cp r16, r17
|
|
sec
|
|
breq Eeprom_WriteByteIfChanged_end
|
|
mov r16, r17
|
|
rcall Eeprom_WriteByte ; (R17)
|
|
Eeprom_WriteByteIfChanged_end:
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
|
|
|
|
#endif ; AQH_AVR_COMMON_EEPROM_W_H
|
|
|
|
|