avr: fully implemented router functionality in network and router app.

avr/common/eeprom-r.asm

@@ -0,0 +1,86 @@
+; ***************************************************************************
+; 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_R_H
+#define AQH_AVR_COMMON_EEPROM_R_H
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Eeprom_ReadByte
+;
+; Read a byte from EEPROM (see example in ATtiny24/44/84 manual p.19).
+;
+; @param X EEPROM Address to read from
+; @return CFLAG set if address okay, cleared if out of range
+; @return R16 byte read
+; @return X   EEPROM Address incremented
+; @clobbers none
+
+Eeprom_ReadByte:
+  rcall Eeprom_CheckAddr
+  brcs Eeprom_ReadByte_addrOk
+  ret
+Eeprom_ReadByte_addrOk:
+  ; call routine with IRQs disabled
+  push r15
+    inr r15, SREG
+    cli
+    rcall Eeprom_ReadByte_noirq
+    outr SREG, r15
+  pop r15
+  sec
+  ret
+Eeprom_ReadByte_noirq:
+  ; wait until EEPROM ready
+Eeprom_ReadByte_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_ReadByte_waitLoop
+; read from EEPROM
+  out EEARH, xh            ; set EEPROM address
+  out EEARL, xl
+  sbi EECR, EERE           ; start EEPROM read by writing EERE
+  in r16, EEDR             ; read data from data register
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Eeprom_CheckAddr
+;
+;
+; @param X EEPROM Address to validate
+; @return CFLAG set if address okay, cleared if out of range
+; @clobbers r16
+
+Eeprom_CheckAddr:
+  mov r16, xl
+  subi r16, LOW(EEPROMEND)
+  mov r16, xh
+  sbci r16, HIGH(EEPROMEND)
+  brcc Eeprom_CheckAddr_ok
+  clc
+  rjmp Eeprom_CheckAddr_end
+Eeprom_CheckAddr_ok:
+  sec
+Eeprom_CheckAddr_end:
+  ret
+; @end
+
+
+
+
+#endif ; AQH_AVR_COMMON_EEPROM_R_H
+
+