Salve a tutti. Ho un problema con un programma in assembler che sto scriverndo per un AT90S2313. In pratica realizza un controllo PWM il cui valore è settato da tre tastini: prog, più e meno. Per programmare bisogna premere contemporaneamente prog e più o meno a seconda.
Ho settato il Timer1 come PWM a 9 bit e senza prescaler (per arrivare vicino alla frequenza di 4 kHz che mi serve). In teoria vorrei che tutte le volte che riaccendo la scheda, il valore del duty cycle fosse quello impostato. Voi direte: te lo scrivi in EEPROM e sei a posto, basta leggerlo ad ogni start-up. Il problema sta qua! :-( Settando il Timer1 come PWM a 8 bit, leggo, scrivo e faccio quello che voglio col valore del OCR1AL, che è il registro che contiene il valore del duty cicle (più o meno... è il registro di compare-match). Quando però passo ai 9 bit, non riesco a fare "resuscitare" i valori allo start-up. Allego qua sotto il codice. Un grande grazie a chi può darmi una mano! Ciao Pelo
.INCLUDE "2313DEF.INC"
;*******DEF************************************************************ ;.DEF =R1 ;.DEF =R2 ;.DEF =R3 ;.DEF =R4 ;.DEF =R5 ;.DEF =R6 ;.DEF =R7 ;.DEF =R8 ;.DEF =R9 ;.DEF =R10 ;.DEF =R11 ;.DEF =R12 ;.DEF =R13 ;.DEF =R14 ;.DEF =R15 .DEF BUFFER =R16 .DEF TEMP =R17 ;.DEF =R18 .DEF TEMP2 =R19 .DEF FLAG =R20 .DEF KEYA =R21 .DEF KEYB =R22 ;.DEF =R23 .DEF BASSO =R24 ; Inizio registri PAIR .DEF ALTO =R25 ;.XL =R26 ; Da non toccare ;.XH =R27 ; " " ;.YL =R28 ; " " ;.YH =R29 ; " " ;.ZL =R30 ; " " ;.ZH =R31 ; " "
.equ EEPROMADDRESS =0x20 .equ PIU =5 .equ MENO =4 .equ PROG =3 .equ STEP =1 ;**************************INTERRUPT VECTORS *********************
.ORG 0x000
rjmp MAIN ;RESET reti ;EXT_INT0 reti ;EXT_INT1 reti ;TIM1_CAPT reti ;TIM1_COMP reti ;TIM1_OVF reti ;TIM0_OVF reti ;SPI_STC reti ;UART_RXC reti ;UART_DRE reti ;UART_TXC reti ;ADC reti ;EE_READY reti ;ANA_COMP
.org 0x010 ;************************************* STACK POINTER INIT
*****************************************
MAIN: ldi BUFFER,low(RAMEND) out SPL,BUFFER
;*********************************** GENERAL INTERRUPT MASK
**************************************** ldi BUFFER,0b10000000 ; Enable the External interrupt 1 ;ldi BUFFER,0b01000000 ; Enable the External interrupt 0 ;ldi BUFFER,0b10000000 ; Enable the External interrupt 0 and 1 out GIMSK, BUFFER
;***************************************** MCUCR INIT
********************************************
;ldi BUFFER,0b00xxxxxx ; Reserved bits ;ldi BUFFER,0bxx1xxxxx ; Sleep mode enable ;ldi BUFFER,0bxxx1xxxx ; Sleep mode select: 0->Idle mode 1->Power down ;ldi BUFFER,0bxxxx1xxx ; ISC11 |->Set external interrupt mode ;ldi BUFFER,0bxxxxx1xx ; ISC10 | See Manual p.30 for details ;ldi BUFFER,0bxxxxxx1x ; ISC01 | ;ldi BUFFER,0bxxxxxxx1 ; ISC00 | ldi BUFFER,0b00001000 out MCUCR,BUFFER
;*************************************** EEPROM INIT
**********************************************
ldi BUFFER,0b00000000 ;Reset the EEPROM address register out EEAR,BUFFER ;Init the EEPROM control register ;ldi BUFFER,0b0000xxxx ;0 are reserved bits ;ldi BUFFER,0bxxxx1xxx ;Ready interrupt enable ;ldi BUFFER,0bxxxxx1xx ;Master write enable ;ldi BUFFER,0bxxxxxx1x ;Write enable ;ldi BUFFER,0bxxxxxxx1 ;Read enable ldi BUFFER,0b00000000 out EECR,BUFFER
;*********************************** TIMER/COUNTER 1 INIT******************************************
ldi BUFFER,0b10000010 ; out TCCR1A,BUFFER ldi BUFFER,0b00000001 ; out TCCR1B,BUFFER
;**************************************** PORT INIT
*********************************************** ;DDR PORT I/O Pullup Comment ;0 0 In No Tristate ;0 1 In Yes Input with pull-up ;1 0 Out No Push-Pull Zero out ;1 1 Out No Push-Pull One out
;**************************************** INIT PORT B
*********************************************
; As OUTPUT Zero OUTPUT ldi BUFFER,0b11111111 out DDRB,BUFFER ldi BUFFER,0b00000000 out PORTB,BUFFER
;**************************************** INIT PORT D
*********************************************
; As INPUT with PULLUP ldi BUFFER,0b00000000 out DDRD,BUFFER ldi BUFFER,0b11111111 out PORTD,BUFFER
;***************************************************************************
************************ ;******************************************** MAIN
************************************************* ;***************************************************************************
************************
; Reads the PWM from the EEPROM Memory ldi BUFFER,EEPROMADDRESS ; Read the first byte out EEAR,BUFFER sbi EECR,EERE read1: sbic EECR,EERE rjmp read1 in BASSO,EEDR
;ldi BUFFER,EEPROMADDRESS ; Read the second byte inc BUFFER out EEAR,BUFFER sbi EECR,EERE read2: sbic EECR,EERE rjmp read2 in ALTO,EEDR out OCR1AH,ALTO out OCR1AL,BASSO
Lupo: sbrc FLAG,0 rjmp xxx in TEMP,PIND sbrc TEMP,PROG rjmp Lupo sbr FLAG,1
Program:
in KEYB,PIND mov TEMP,KEYB in BASSO,OCR1AL in ALTO, OCR1AH
ldi BUFFER,STEP sbrs TEMP,PIU
adiw ALTO:BASSO,STEP sbrs TEMP,MENO sbiw ALTO:BASSO,STEP
out OCR1AH,ALTO out OCR1AL,BASSO in ALTO,OCR1AH in BASSO,OCR1AL
wait_EEWE2: sbic EECR,EEWE ; Waits for write ready rjmp wait_EEWE2 ldi TEMP,EEPROMADDRESS ; Load the high address of position in memory out EEAR,TEMP out EEDR,ALTO sbi EECR,EEMWE ; Set the EEPROM Master Write Enable bit sbi EECR,EEWE ; Set the EEPROM Write Enable bit
wait_EEWE3: sbic EECR,EEWE ; Waits for write ready rjmp wait_EEWE3 ;ldi TEMP,EEPROMADDRESS ; Load the low address of position in memory inc TEMP out EEAR,TEMP out EEDR,BASSO sbi EECR,EEMWE ; Set the EEPROM Master Write Enable bit sbi EECR,EEWE ; Set the EEPROM Write Enable bit
wait_EEWE4: sbic EECR,EEWE ; Waits for write ready rjmp wait_EEWE4
xxx: in KEYA,PIND cp KEYA,KEYB breq Lupo cbr FLAG,1 rjmp Lupo