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Dabar yra 2025 11 04, 15:48. Visos datos yra GMT + 2 valandos.
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Forumas » Mikrovaldikliai » UART per "paprastas" kojas
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UART per "paprastas" kojas |
 Parašytas: 2006 11 16, 23:09 |
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| Sveiki gal kam teko rasit koki nors koda kad mestu per betkoki porto koja tekstiniu ar kitus tekstus duomenys, informacija perdavineti. Pavizdziui per uart gali lengvai atiduodi tekstini ar kita informacija, noreciau ta pacia funcija atlikti per kita avr'o valdikli kuris neturi uart, ka tada daryt..??? |
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UART per "paprastas" kojas |
| Parašytas: 2006 11 17, 09:51 |
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| AVRLIB turi softwarinio UART biblioteka uartsw.h aisku jeigu programuoji naudodamasis WINAVR. |
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UART per "paprastas" kojas |
| Parašytas: 2006 11 18, 22:21 |
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| na as polkas codevisionavr, bet pabaiges pora likusiu pradetu projektuku pereisiu arba bent po truputi bandysiu CrossWorks del ARM, kiek zinau tas CrossWorks palaiko ir AVR... ir daugiau galimybiu turi... |
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UART per "paprastas" kojas |
| Parašytas: 2006 11 19, 13:32 |
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| idomu koks % erroru su sw uart? as tai siulyciau daryti softwarini SPI jei yra galimybe, tai butu gerokai paprasciau ir tiksliau nei uart. |
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UART per "paprastas" kojas |
| Parašytas: 2006 12 30, 23:02 |
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Na man reikia siai dienai nepilno "uart" arba tiksliau tik TX issiusti duomenys... velesniuose projektuose pilno rx ir tx...
Gal kas turi pavizdziu codevisionavr kompiliatoriui... (atmega8 arba atmega16)? Buvau rades atmega128... bet ten daug papildomo kodo, nelabai einasi susigaudyti... |
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UART per "paprastas" kojas |
| Parašytas: 2007 01 09, 10:13 |
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;***************************************************************************************
;
;
; Title: RF remote control at 418MHz with roll-code
;
; (RF 418MHz transmitter code)
;
;Device:AT90s2323 at 4MHz crystal
;and TLP-434 RF transmitter (418 MHz)
;Author: Serasidis Vasilis
;Date: 04.06.2004
;Updated: 15.04.2005 Added roll-code feaure.
; Home: http://www.serasidis.gr
; email: info@serasidis.gr
;
; Based in software UART at 2400bps, 8n1
;
;***************************************************************************************
.include "2323def.inc" ;Define chip
.equ TxD =0 ;Transmition pin is PB0
.equ key1 =2 ;Key No1 is connected to pin PB2
.equ key2 =1 ;Key No2 is connected to pin PB1
.equ Key_1 =01
.equ Key_2 =02
.def temp =R16 ;temporary storage register.
.def temp2 =R17 ;temporary storage register.
.def Txbyte =R18 ;Data to be transmitted.
.def init_byte =R19 ;This byte is sended first and its to recognize the receiver the correct remote control.
.def second_byte =R20 ;This byte is sended second and its to recognize the receiver the correct remote control.
.def command =R21 ;The command byte mean which key is pressed from the remote.
.def bitcnt =R23 ;bit counter
.def count =R24
.def dcount =R25
.def dcount2 =R26
.def rollcode =R27
.cseg
.org 0
rjmp reset ;Reset handler
ret ;Return from sleep and go to "keys" address.
reset:
ldi temp,RAMEND
out SPL,temp ;Init Stack Pointer
ldi temp,0b00000001 ;PB0 output, PB1, PB2 inputs
out DDRB,temp
ldi temp,0b00000111
out portB,temp ;enable internal pullup resistor on PB1 and disable on PB2...
;...and enable Data-pin TxD (PB0).
start:
clr second_byte
Release_keys:
rcall delay
sbis PINB,key1 ;
rjmp Release_keys
rcall delay
sbis PINB,key2 ;
rjmp Release_keys
;subi second_byte,$20
ldi temp,0x30 ;turn on sleep mode (Power-down mode)
out MCUCR,temp ;interrupt on low level.
ldi temp,0x40 ;enable external interrupts (INT0)
out GIMSK,temp
sei ;enable global interrupts ready
sleep ;go to sleep mode
;===================================================================================
keys:
sbic PINB,key1 ;
rjmp next_key
ldi command,Key_1 ;load the code for key No1
rjmp Enable_RF
next_key:
ldi command,Key_2 ;load the code for key No2
Enable_RF:
ldi count,4
load:
ldi init_byte,$30 ;Load init_byte register with initial byte (recognition byte).
mov txbyte,init_byte ;1) send initial byte
rcall b_transmit
mov txbyte,second_byte ;2) send second byte
rcall b_transmit
mov txbyte,command ;3) send the command byte
rcall b_transmit
eor init_byte,second_byte ;4) create the checksum of bytes "init_byte" and "second_byte"...
eor init_byte,command
mov txbyte,init_byte ;...move the resault to transmit byte (txbyte)...
rcall b_transmit ;and send it out.
dec count ;send 4 times the data
brne load
inc second_byte
rjmp Release_keys ;
;***************************************************************************
;* Transmition routine TxD
;***************************************************************************
b_transmit:
ldi bitcnt,10 ;1+8+sb (sb is # of stop bits)
com Txbyte ;Invert everything
sec ;Start bit
putchar0:
brcc putchar1 ;If carry set
cbi PORTB,TxD ; send a '0'
rjmp putchar2 ;else
putchar1:
sbi PORTB,TxD ; send a '1'
nop
putchar2:
rcall UART_delay ;One bit delay
rcall UART_delay
lsr Txbyte ;Get next bit
dec bitcnt ;If not all bit sent
brne putchar0 ;send next
ret ;return
;***************************************************************************
;*
;* "UART_delay"
;*
;* This delay subroutine generates the required delay between the bits when
;* transmitting and receiving bytes. The total execution time is set by the
;* constant "b":
;*
;* 3xb + 7 cycles (including rcall and ret)
;***************************************************************************
.equ b=135 ;2400 bps @ 4 MHz crystal, +5V
.equ c=2
UART_delay:
ldi temp2,c
UART_delay2:
ldi temp,b
UART_delay1:
dec temp
brne UART_delay1
dec temp2
brne UART_delay2
ret
;***************************************************************************
;* Delay routine
;***************************************************************************
delay:
ldi dcount2,10
delay_:
ldi dcount,250
delay1:
dec dcount
brne delay1
dec dcount2
brne delay_
ret
.db "(c) 09.06.2004 by Serasidis Vasilis. www.serasidis.gr" |
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UART per "paprastas" kojas |
| Parašytas: 2007 01 09, 10:20 |
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Štai tau asmo porcija, bandyk sukramtyti 
Jei pavyks, papostinsiu SoftReceive;
Tiesa, turbūt aišku kad ten kodas iš tam tikro projekto, todėl jį reikia perrašyti. |
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