avr/devices/all: started integrating code from t03.

avr/devices/all/hw_tn841.asm

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+; ***************************************************************************
+; 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.   *
+; ***************************************************************************
+
+; Hardware routine  for AtTiny 84 devices
+
+
+.cseg
+
+
+; ---------------------------------------------------------------------------
+; @routine systemInitHardware
+;
+
+systemInitHardware:
+  ; set all ports as inputs and enable internal pull-up resistors
+  ldi r16, 0xff
+  clr r17
+
+  out DDRA, r17  ; all input
+  sts PUEA, r16  ; enable pull-up on all
+
+  out DDRB, r17  ; all input
+  sts PUEB, r16  ; enable pull-up on all
+
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine systemSetSpeed
+;
+
+systemSetSpeed:
+.if clock == 1000000
+  ldi r17, 0xd8
+  ldi r16, (1<<CLKPS1) | (1<<CLKPS0) ; SUT=0, CLKPS=0011b
+  sts CCP, r17
+  sts CLKPR, r16
+.endif
+
+.if clock == 8000000
+  ldi r17, 0xd8
+  clr r16           ; SUT=0, CLKPS=0
+  sts CCP, r17
+  sts CLKPR, r16
+.endif
+
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine systemSleep
+;
+
+systemSleep:
+  ; only modify SE, SM1 and SM0
+  cli
+  in r16, MCUCR
+  ldi r17, (1<<SE) | (1<<SM1) | (1<<SM0)
+  neg r17
+  and r16, r17
+  ori r16, (1<<SE)           ; sleep mode "idle", enable
+  out MCUCR, r16
+  sei                        ; make sure interrupts really are enabled
+  sleep                      ; sleep, wait for interrupt
+  ret
+; @end
+
+
+