|
|
|
@ -44,7 +44,7 @@ PCF_IDLE_ .EQU (PCF_PIN | PCF_ES0 | PCF_ACK) |
|
|
|
; STATUS REGISTER BITS |
|
|
|
; |
|
|
|
;PCF_PIN .EQU 10000000B |
|
|
|
PCF_INI .EQU 01000000B ; 1 if not initialized |
|
|
|
PCF_INI .EQU 01000000B ; 1 if not initialized |
|
|
|
PCF_STS .EQU 00100000B |
|
|
|
PCF_BER .EQU 00010000B |
|
|
|
PCF_AD0 .EQU 00001000B |
|
|
|
@ -53,14 +53,14 @@ PCF_AAS .EQU 00000100B |
|
|
|
PCF_LAB .EQU 00000010B |
|
|
|
PCF_BB .EQU 00000001B |
|
|
|
; |
|
|
|
; THE PCF8584 TARGETS A TOP I2C CLOCK SPEED OF 90KHZ AND SUPPORTS DIVIDERS FOR |
|
|
|
; THE PCF8584 TARGETS A TOP I2C CLOCK SPEED OF 90KHZ AND SUPPORTS DIVIDERS FOR |
|
|
|
; 3, 4.43, 6, 8 AND 12MHZ TO ACHEIVE THIS. |
|
|
|
; |
|
|
|
; +--------------------------------------------------------------------------------------------+ |
|
|
|
; | div/clk | 2MHz | 4MHz | 6MHz | 7.38Mhz | 10MHz | 12MHz | 16MHz | 18.432Mhz | 20MHz | |
|
|
|
; +----------------------------------------------------------------------------------+---------+ |
|
|
|
; | 3MHz | 60Khz | 120Khz | | | | | | | | |
|
|
|
; | 4.43MHz | | 81Khz | | | | | | | | |
|
|
|
; | 4.43MHz | | 81Khz | | | | | | | | |
|
|
|
; | 6MHz | | | 90Khz | 110Khz | | | | | | |
|
|
|
; | 8MHz | | | | 83Khz | 112Khz | | | | | |
|
|
|
; | 12MHz | | | | | | 90Khz | 120Khz | 138Khz | 150Khz | |
|
|
|
@ -116,21 +116,21 @@ PCF_INIT: |
|
|
|
; I2C_OUTB = LD A,* | OUT (PCF_RS0),A |
|
|
|
; SET_PCF -= LD A,* | OUT (PCF_RS1),A |
|
|
|
; GET_PCF = IN A,(PCF_RS1) |
|
|
|
; |
|
|
|
; |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
PCF_START: |
|
|
|
LD A,PCF_START_ |
|
|
|
LD A,PCF_START_ |
|
|
|
OUT (PCF_RS1),A |
|
|
|
RET |
|
|
|
; |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
PCF_REPSTART: |
|
|
|
LD A,PCF_REPSTART_ |
|
|
|
LD A,PCF_REPSTART_ |
|
|
|
OUT (PCF_RS1),A |
|
|
|
RET |
|
|
|
; |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
PCF_STOP: |
|
|
|
PCF_STOP: |
|
|
|
LD A,PCF_STOP_ |
|
|
|
OUT (PCF_RS1),A |
|
|
|
RET |
|
|
|
@ -138,7 +138,7 @@ PCF_STOP: |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
; |
|
|
|
PCF_INITDEV: |
|
|
|
LD A,PCF_PIN ; S1=80H: S0 SELECTED, SERIAL |
|
|
|
LD A,PCF_PIN ; S1=80H: S0 SELECTED, SERIAL |
|
|
|
OUT (PCF_RS1),A ; INTERFACE OFF |
|
|
|
NOP |
|
|
|
IN A,(PCF_RS1) ; CHECK TO SEE S1 NOW USED AS R/W |
|
|
|
@ -147,7 +147,7 @@ PCF_INITDEV: |
|
|
|
AND 07FH ; CTRL. PCF8584 DOES THAT WHEN ESO |
|
|
|
JR NZ,PCF_FAIL ; IS ZERO |
|
|
|
; |
|
|
|
LD A,PCF_OWN ; LOAD OWN ADDRESS IN S0, |
|
|
|
LD A,PCF_OWN ; LOAD OWN ADDRESS IN S0, |
|
|
|
OUT (PCF_RS0),A ; EFFECTIVE ADDRESS IS (OWN <<1) |
|
|
|
NOP |
|
|
|
IN A,(PCF_RS0) ; CHECK IT IS REALLY WRITTEN |
|
|
|
@ -177,9 +177,9 @@ PCF_INITDEV: |
|
|
|
JP NZ,PCF_CLKERR |
|
|
|
; |
|
|
|
LD A,PCF_IDLE_ |
|
|
|
OUT (PCF_RS1),A |
|
|
|
OUT (PCF_RS1),A |
|
|
|
NOP |
|
|
|
IN A,(PCF_RS1) |
|
|
|
IN A,(PCF_RS1) |
|
|
|
;CALL PC_SPACE |
|
|
|
;CALL PRTHEXBYTE |
|
|
|
CP +(PCF_PIN | PCF_BB) |
|
|
|
@ -195,21 +195,21 @@ PCF_FAIL: |
|
|
|
RET |
|
|
|
; |
|
|
|
PCF_FAIL_FLAG: |
|
|
|
.DB 0 |
|
|
|
.DB 0 |
|
|
|
; |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
PCF_HANDLE_LAB: |
|
|
|
; |
|
|
|
LD A,PCF_PIN |
|
|
|
OUT (PCF_RS1),A |
|
|
|
LD A,PCF_ES0 |
|
|
|
LD A,PCF_PIN |
|
|
|
OUT (PCF_RS1),A |
|
|
|
LD A,PCF_ES0 |
|
|
|
OUT (PCF_RS1),A |
|
|
|
; |
|
|
|
LD HL,PCF_LABDLY |
|
|
|
PCF_LABLP: |
|
|
|
LD A,H |
|
|
|
OR L |
|
|
|
DEC HL |
|
|
|
DEC HL |
|
|
|
JR NZ,PCF_LABLP |
|
|
|
; |
|
|
|
IN A,(PCF_RS1) |
|
|
|
@ -226,7 +226,7 @@ PCF_WAIT_FOR_PIN: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_PINTO ; SET TIMEOUT VALUE |
|
|
|
|
|
|
|
PCF_WFP0: |
|
|
|
PCF_WFP0: |
|
|
|
IN A,(PCF_RS1) ; GET BUS |
|
|
|
LD (PCF_STATUS),A ; STATUS |
|
|
|
LD B,A |
|
|
|
@ -236,7 +236,7 @@ PCF_WFP0: |
|
|
|
OR L |
|
|
|
JR Z,PCF_WFP1 ; YES WE HAVE, GO ACTION IT |
|
|
|
|
|
|
|
LD A,B ; |
|
|
|
LD A,B ; |
|
|
|
AND PCF_PIN ; IS TRANSMISSION COMPLETE? |
|
|
|
JR NZ,PCF_WFP0 ; KEEP ASKING IF NOT OR |
|
|
|
POP HL ; YES COMPLETE (PIN=0) RETURN WITH ZERO |
|
|
|
@ -244,14 +244,14 @@ PCF_WFP0: |
|
|
|
PCF_WFP1: |
|
|
|
LD A,B ; DID WE LOSE ARBITRATION? |
|
|
|
AND PCF_LAB ; IF A=0 THEN NO |
|
|
|
CPL |
|
|
|
JR NZ,PCF_WFP2 ; NO |
|
|
|
CPL |
|
|
|
JR NZ,PCF_WFP2 ; NO |
|
|
|
CALL PCF_HANDLE_LAB ; YES GO HANDLE IT |
|
|
|
LD (PCF_STATUS),A |
|
|
|
XOR A ; RETURN NZ, A=01H |
|
|
|
INC A |
|
|
|
PCF_WFP2: |
|
|
|
POP HL ; RET NZ, A=FF IF TIMEOUT |
|
|
|
POP HL ; RET NZ, A=FF IF TIMEOUT |
|
|
|
RET |
|
|
|
; |
|
|
|
PCF_STATUS .DB 00H |
|
|
|
@ -270,12 +270,12 @@ PCF_WFA0: |
|
|
|
IN A,(PCF_RS1) ; READ PIN |
|
|
|
LD (PCF_STATUS),A ; STATUS |
|
|
|
LD B,A |
|
|
|
; |
|
|
|
; |
|
|
|
DEC HL ; SEE IF WE HAVE TIMED |
|
|
|
LD A,H ; OUT WAITING FOR PIN |
|
|
|
OR L ; EXIT IF |
|
|
|
JR Z,PCF_WFA1 ; WE HAVE |
|
|
|
; |
|
|
|
; |
|
|
|
LD A,B ; OTHERWISE KEEP LOOPING |
|
|
|
AND PCF_PIN ; UNTIL WE GET PIN |
|
|
|
JR NZ,PCF_WFA0 ; OR TIMEOUT |
|
|
|
@ -291,7 +291,7 @@ PCF_WFA1: |
|
|
|
PCF_WFA2: |
|
|
|
POP HL ; EXIT WITH NZ = FF |
|
|
|
RET |
|
|
|
; |
|
|
|
; |
|
|
|
;-------------------------------------------------------------------------------- |
|
|
|
; |
|
|
|
; HL POINTS TO DATA |
|
|
|
@ -321,7 +321,7 @@ PCF_RB1: |
|
|
|
|
|
|
|
; IS THIS THE SECOND TO LAST BYTE TO GO? |
|
|
|
|
|
|
|
PUSH DE ; SAVE COUNT |
|
|
|
PUSH DE ; SAVE COUNT |
|
|
|
DEC DE ; COUNT (DE) = NUMBER OF BYTES TO READ LESS 1 |
|
|
|
EX DE,HL ; SAVE POINTER, PUT COUNT IN DE |
|
|
|
XOR A ; CLEAR CARRY FLAG |
|
|
|
@ -333,7 +333,7 @@ PCF_RB1: |
|
|
|
; NZ = NO IT ISN'T |
|
|
|
JR NZ,PCF_RB4 |
|
|
|
; |
|
|
|
PCF_RB4:LD A,B ; IF FIRST READ DO A DUMMY |
|
|
|
PCF_RB4:LD A,B ; IF FIRST READ DO A DUMMY |
|
|
|
OR C ; READ OTHERWISE READ AND SAVE |
|
|
|
JR NZ,PCF_RB5 |
|
|
|
|
|
|
|
@ -401,8 +401,8 @@ PCF_WFBB0: |
|
|
|
LD A,H |
|
|
|
OR L |
|
|
|
JR NZ,PCF_WFBB0 ; REPEAT IF NOT TIMED OUT |
|
|
|
CPL ; RET NZ IF TIMEOUT |
|
|
|
RET |
|
|
|
CPL ; RET NZ IF TIMEOUT |
|
|
|
RET |
|
|
|
; |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
; DISPLAY ERROR MESSAGES |
|
|
|
@ -416,7 +416,7 @@ PCF_INIERR: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_NOPCF |
|
|
|
JR PCF_PRTERR |
|
|
|
; |
|
|
|
; |
|
|
|
PCF_SETERR: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_WRTFAIL |
|
|
|
@ -426,17 +426,17 @@ PCF_REGERR: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_REGFAIL |
|
|
|
JR PCF_PRTERR |
|
|
|
; |
|
|
|
; |
|
|
|
PCF_CLKERR: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_CLKFAIL |
|
|
|
JR PCF_PRTERR |
|
|
|
; |
|
|
|
; |
|
|
|
PCF_IDLERR: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_IDLFAIL |
|
|
|
JR PCF_PRTERR |
|
|
|
; |
|
|
|
JR PCF_PRTERR |
|
|
|
; |
|
|
|
PCF_ACKERR: |
|
|
|
PUSH HL |
|
|
|
LD HL,PCF_ACKFAIL |
|
|
|
@ -470,7 +470,7 @@ PCF_BBERR: |
|
|
|
PCF_PRTERR: |
|
|
|
CALL PRTSTR |
|
|
|
; CALL NEWLINE |
|
|
|
POP HL |
|
|
|
POP HL |
|
|
|
RET |
|
|
|
; |
|
|
|
;----------------------------------------------------------------------------- |
|
|
|
@ -494,7 +494,7 @@ PCF_DBG: |
|
|
|
POP DE |
|
|
|
POP AF |
|
|
|
RET |
|
|
|
PCF_DBGF: |
|
|
|
PCF_DBGF: |
|
|
|
.DB 0 ; DEBUG STAGE COUNTER |
|
|
|
#ENDIF |
|
|
|
; |
|
|
|
|
Dan Werner
2 years ago