mirror of
https://github.com/EranMorkon/AMTS.git
synced 2023-12-28 16:48:38 +00:00
Adding Reischl
This commit is contained in:
parent
e30b39b37a
commit
76010f8d07
97 changed files with 1375 additions and 43 deletions
174
Reischl/lst/SIO_V24_Echo_Poll.s
Normal file
174
Reischl/lst/SIO_V24_Echo_Poll.s
Normal file
|
|
@ -0,0 +1,174 @@
|
|||
;******************************************************************************
|
||||
;* Z80 Assembler program *
|
||||
;* Josef Reisinger *
|
||||
;* josef.reisinger@htl-hl.ac.at *
|
||||
;* 10/07/2017 *
|
||||
;******************************************************************************
|
||||
|
||||
|
||||
; ---------------------------- PIO 82C55 I/O ---------------------------------
|
||||
PIO_A: EQU $80 ; (INPUT)
|
||||
PIO_B: EQU $81 ; (OUTPUT) OUT TO LEDS
|
||||
PIO_C: EQU $82 ; (INPUT) IN from DIP SWITCHES
|
||||
PIO_CON: EQU $83 ; CONTROL BYTE PIO 82C55
|
||||
|
||||
|
||||
; --------------------------- CTC Z80 Timer Counter --------------------------
|
||||
CTC0 EQU $00 ; Channel 0
|
||||
CTC1 EQU $01 ; Channel 1
|
||||
CTC2 EQU $02 ; Channel 2
|
||||
CTC3 EQU $03 ; Channel 3
|
||||
|
||||
; -------------------------- SIO (USART) ----------------------------------------
|
||||
SIO_A_D: EQU $40 ; Channel A Data Register
|
||||
SIO_B_D: EQU $41 ; Channel B Data Register
|
||||
SIO_A_C: EQU $42 ; Channel A Control Register
|
||||
SIO_B_C: EQU $43 ; Channel B Control Register
|
||||
|
||||
|
||||
;-------------------------- CONSTANTS ----------------------------------------
|
||||
RAMTOP: EQU $FFFF ; 32Kb RAM 8000H-FFFFH
|
||||
CR: EQU $0D
|
||||
LF: EQU $0A
|
||||
SPACE: EQU $20
|
||||
|
||||
;******************************************************************************
|
||||
;* RESET HANDLER *
|
||||
;* Function: Start Main Programm *
|
||||
;******************************************************************************
|
||||
ORG $0000
|
||||
JP MAIN ; jump to Main program
|
||||
|
||||
|
||||
;******************************************************************************
|
||||
;* NMI HANDLER *
|
||||
;* Handles NMI Interrupt Request *
|
||||
;******************************************************************************
|
||||
ORG $0066
|
||||
LD HL,NMI_TEXT ; Send NMI to V24
|
||||
CALL SIO_PUT_STRING
|
||||
RETN
|
||||
|
||||
;******************************************************************************
|
||||
;* MAIN PROGRAM *
|
||||
;******************************************************************************
|
||||
ORG $100
|
||||
MAIN: DI ; Disable interrupt
|
||||
LD SP,RAMTOP ; Set stack pointer
|
||||
CALL PIO_INIT ; Init PIO (8255)
|
||||
CALL CTC_INIT ; Initialize CTC Channel 1 for 9600 Baud (SIO Channel A)
|
||||
CALL SIO_INIT ; Initialize SIO for character based transfer (9600,n,8,1)
|
||||
LD HL,START_TEXT ; Send Welcome Text to V24
|
||||
CALL SIO_PUT_STRING
|
||||
_AGAIN: CALL SIO_GET_CHAR ; Wait for Character on V24
|
||||
LD A,E ; Output Error to LED's
|
||||
OUT (PIO_B),A
|
||||
CALL SIO_PUT_CHAR ; Echo Character to V24
|
||||
JP _AGAIN
|
||||
;
|
||||
|
||||
;******************************************************************************
|
||||
;* Initialize PIO (8255) *
|
||||
;******************************************************************************
|
||||
PIO_INIT: LD A,$99 ; Init PIO 8255 Control Word:
|
||||
; PA0-PA7=IN (DIP SWITCHES)
|
||||
; PB0-PB7=OUT (LEDS),
|
||||
OUT (PIO_CON),A ; PC0-PC7=IN, Mode 0 Selection
|
||||
RET
|
||||
|
||||
;******************************************************************************
|
||||
;* Initialize CTC Channel 1 (SIO Channel A Clock) *
|
||||
;******************************************************************************
|
||||
CTC_INIT: LD A,$05 ; Init Timer Counter - Channel 1
|
||||
OUT (CTC1),A ; for Baudrate 9600 (No Interrupt, Timer Mode, PSC=16,
|
||||
; trigger on positive edge
|
||||
LD A,$0C ; Write Time constant 12*16*552ns= 105,98s
|
||||
OUT (CTC1),A
|
||||
RET
|
||||
|
||||
|
||||
;******************************************************************************
|
||||
;* Initialize SIO Channel A for character based transfer *
|
||||
;******************************************************************************
|
||||
SIO_INIT: LD A,$30 ; Write to WR0 Register --> Error Reset
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$18 ; Write to WR0 Register --> Channel Reset
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$04 ; Select WR4 Register
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$04 ; CLK*1, 1STOP Bit, No Parity
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$03 ; Select WR3 Register
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$C1 ; RX enable,8 Data Bits
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$05 ; Select WR5 Register
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$68 ; TX enable,8 Data Bits, DTR inactive, RTS inactive, Break off
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$1 ; Select WR1 Register
|
||||
OUT (SIO_A_C),A
|
||||
LD A,$0 ; No Interrupts for Rx and Tx Characters
|
||||
OUT (SIO_A_C),A
|
||||
RET
|
||||
|
||||
|
||||
|
||||
;******************************************************************************
|
||||
;* Send one Character Via SIO Channel A(Polling Mode) *
|
||||
;* D- Register: Character to send (ASCII Code) *
|
||||
;******************************************************************************
|
||||
SIO_PUT_CHAR: PUSH AF
|
||||
_TX_READY: IN A,(SIO_A_C) ; Read RRO Register
|
||||
BIT 2,A ; TX Buffer empty ?
|
||||
JP Z,_TX_READY ; No --> Wait
|
||||
LD A,D ; load character in A
|
||||
OUT (SIO_A_D),A ; Send character (Transfer Buffer)
|
||||
POP AF
|
||||
RET
|
||||
|
||||
|
||||
;******************************************************************************
|
||||
;* Receive one Character Via SIO Channel A(Polling Mode) *
|
||||
;* D- Register: Character received (ASCII Code) *
|
||||
;* E-Register: Error Code *
|
||||
;******************************************************************************
|
||||
SIO_GET_CHAR: PUSH AF
|
||||
_RX_READY: IN A,(SIO_A_C) ; Read RRO Register
|
||||
BIT 0,A ; RX Character Available ?
|
||||
JP Z,_RX_READY ; No --> Wait
|
||||
IN A,(SIO_A_D) ; Store character
|
||||
LD D,A
|
||||
LD A,$01 ; Select WR1 Register
|
||||
OUT (SIO_A_C),A
|
||||
IN A,(SIO_A_C) ; Read Error Register
|
||||
LD E,A ; store Error Status
|
||||
AND $70 ; only D6(CRC Framing Error),D5(Rx Overrun Error) und D4 (Parity Error)
|
||||
JP Z,_RX_EXIT ; return if no error
|
||||
LD A,$30 ; reset Error
|
||||
OUT (SIO_A_C),A
|
||||
_RX_EXIT: POP AF
|
||||
RET
|
||||
|
||||
|
||||
;******************************************************************************
|
||||
;* SEND STRING to V24 via SIO *
|
||||
;* HL: contains start address of string *
|
||||
;******************************************************************************
|
||||
SIO_PUT_STRING: PUSH AF
|
||||
_NEXT_CHAR: LD A,(HL) ; get character
|
||||
CP $00 ; END of String ?
|
||||
JP Z,_TEXT_END
|
||||
LD D,A
|
||||
CALL SIO_PUT_CHAR ; send character
|
||||
INC HL ; next character
|
||||
JP _NEXT_CHAR
|
||||
_TEXT_END: POP AF
|
||||
RET
|
||||
|
||||
|
||||
;******************************************************************************
|
||||
;* TEXT DEFINITIONS *
|
||||
;******************************************************************************
|
||||
START_TEXT: DEFB CR,LF,'Z','8','0',SPACE,'D','E','M','O',SPACE,'V','1','.','0',$00
|
||||
NMI_TEXT: DEFB CR,LF,'N','M','I',$00
|
||||
Loading…
Add table
Add a link
Reference in a new issue