$nomod51                ;der Modus fuer 8051 wird abgeschaltet
$debug
$title (PWM_LED.A51)
$include(C8051F340.inc)
;------------------------------------------------------------------------
;Programmbeschreibung
;------------------------------------------------------------------------
;Programm:
;Grundstellung - irgendwo zwischen auf und ab
;T2 heller
;T3 dunkler
;
;
;Erstellt am: Freitag, 10. August 2007 09:36:16 
;Programmiert: 
;
;Verwendete Einspruenge: keine
;
;Verwendete Unterprogramme: keine
;
;
;Verwendete Register und Variable:
;Registerbank(0)
;R2
;
;Kommentar:
;
;Aenderungen:
;Geaendert am: Freitag, 10. August 2007 09:36:16
;
;
;------------------------------------------------------------------------
;Initialisierungsteil fuer allgemeine Konstanten
;------------------------------------------------------------------------
INC_SERVO EQU 128
CSEG AT 0H              ;Legt absolute Codesegmentadresse auf 0h
jmp INIT
;
;------------------------------------------------------------------------
;Interrupt-Vektoren
;------------------------------------------------------------------------
ORG 05Bh
clr CF					;Counter Flag quittieren
call ISR_PCA			;Interrupt Service Routine aufrufen
reti 

;------------------------------------------------------------------------
;Initialisierungsteil fuer On-Chip Peripherie
;------------------------------------------------------------------------
ORG 100H                ;Programmstart bei 100H
INIT:
call Init_Device		;Aufruf der Initialisierung
;------------------------------------------------------------------------
;Programmschleife
;------------------------------------------------------------------------

ABFRAGE:
mov C,P1.1 				;Kopieren des Ausgangsports
mov P3.2,C
mov P3.3,C
mov P3.4,C
jmp ABFRAGE				;Warteschleife

ISR_PCA:
jnb P1.2,SERVO_AUF		;Flanke spaeter
jnb P1.3,SERVO_AB		;Flanke frueher
ret						;Aus der ISR_PCA

SERVO_AUF:
mov A,PCA0CPL1			;Compare P1.1 Low Byte in Akku
clr C
add A,#INC_SERVO		;Addieren mit Carry
mov PCA0CPL1,A			;wieder zurueck
mov A,PCA0CPH1			;HB
addc A,#0				;Carry addieren
mov PCA0CPH1,A			;wieder zurueck
ret

SERVO_AB:
mov A,PCA0CPL1			;Compare P1.1 Low Byte in Akku
clr C
subb A,#INC_SERVO				;Addieren mit Carry
mov PCA0CPL1,A			;wieder zurueck
mov A,PCA0CPH1			;HB
subb A,#0				;Carry subtrahieren
mov PCA0CPH1,A			;wieder zurueck
ret

; Peripheral specific initialization functions,
; Called from the Init_Device label
PCA_Init:
    mov  PCA0CN,    #040h
    anl  PCA0MD,    #0BFh
    mov  PCA0MD,    #003h
    mov  PCA0CPM1,  #0C3h
    mov  PCA0CPL1,  #018h
    mov  PCA0CPH1,  #0F3h
    ret

Timer_Init:
    mov  TCON,      #010h
    mov  TMOD,      #001h
    ret

ADC_Init:
    mov  AMX0P,     #013h
    mov  AMX0N,     #01Fh
    mov  ADC0CF,    #0FCh
    mov  ADC0CN,    #081h
    ret

Comparator_Init:
    mov  CPT0MX,    #003h
    ret

Voltage_Reference_Init:
    mov  REF0CN,    #00Ch
    ret

Port_IO_Init:
    ; P0.0  -  SCK  (SPI0), Open-Drain, Digital
    ; P0.1  -  MISO (SPI0), Open-Drain, Digital
    ; P0.2  -  MOSI (SPI0), Open-Drain, Digital
    ; P0.3  -  NSS  (SPI0), Open-Drain, Digital
    ; P0.4  -  TX0 (UART0), Open-Drain, Digital
    ; P0.5  -  RX0 (UART0), Open-Drain, Digital
    ; P0.6  -  SDA (SMBus), Open-Drain, Digital
    ; P0.7  -  SCL (SMBus), Open-Drain, Digital

    ; P1.0  -  CEX0  (PCA), Open-Drain, Digital
    ; P1.1  -  CEX1  (PCA), Push-Pull,  Digital
    ; P1.2  -  Skipped,     Push-Pull,  Digital
    ; P1.3  -  Skipped,     Push-Pull,  Digital
    ; P1.4  -  Unassigned,  Open-Drain, Digital
    ; P1.5  -  Unassigned,  Open-Drain, Digital
    ; P1.6  -  Unassigned,  Open-Drain, Digital
    ; P1.7  -  Unassigned,  Open-Drain, Digital

    ; P2.0  -  Unassigned,  Open-Drain, Digital
    ; P2.1  -  Unassigned,  Open-Drain, Digital
    ; P2.2  -  Unassigned,  Open-Drain, Digital
    ; P2.3  -  Unassigned,  Open-Drain, Digital
    ; P2.4  -  Unassigned,  Open-Drain, Digital
    ; P2.5  -  Unassigned,  Open-Drain, Digital
    ; P2.6  -  Unassigned,  Open-Drain, Digital
    ; P2.7  -  Unassigned,  Open-Drain, Digital

    ; P3.0  -  Unassigned,  Open-Drain, Digital
    ; P3.1  -  Unassigned,  Open-Drain, Digital
    ; P3.2  -  Skipped,     Push-Pull,  Digital
    ; P3.3  -  Skipped,     Push-Pull,  Digital
    ; P3.4  -  Skipped,     Push-Pull,  Digital
    ; P3.5  -  Unassigned,  Open-Drain, Analog
    ; P3.6  -  Unassigned,  Open-Drain, Analog
    ; P3.7  -  Unassigned,  Open-Drain, Analog

    mov  P3MDIN,    #01Fh
    mov  P1MDOUT,   #00Eh
    mov  P3MDOUT,   #01Ch
    mov  P1SKIP,    #00Ch
    mov  P3SKIP,    #01Ch
    mov  XBR0,      #007h
    mov  XBR1,      #0C2h
    ret

Oscillator_Init:
    mov  OSCICN,    #083h
    mov  CLKMUL,    #080h
    clr  A                     ; Wait 5us for initialization
    djnz ACC,       $
    orl  CLKMUL,    #0C0h
Osc_Wait2:
    mov  A,         CLKMUL
    jnb  ACC.5,     Osc_Wait2
    ret

Interrupts_Init:
    mov  IP,        #002h
    mov  EIE1,      #010h
    mov  IE,        #080h
    ret

; Initialization function for device,
; Call Init_Device from your main program
Init_Device:
    lcall PCA_Init
    lcall Timer_Init
    lcall ADC_Init
    lcall Comparator_Init
    lcall Voltage_Reference_Init
    lcall Port_IO_Init
    lcall Oscillator_Init
    lcall Interrupts_Init
    ret

end