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btw, i updated http://nitrofurano.altervista.org/retroc...xspectrum/ again, with some stuff i posted here in the forum
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nice screenshots of your speccy stuff (text and lines)
(but the flashing on the main page is distressing)
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I have to agree... I didn't get further than the main page. Big flashing screens aren't something I can deal with without getting a headache 
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i were expecting for such reaction!  - but btw, M.I.A.'s myspace webpage were far worse than that!
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Hi all,
For fun i've built a wee interface for my own ZX Spectrum which gives the Speccy:-
4off 16bit analogue inputs (configurable from 12-bit to 18bit)
4off 16bit analogue outputs
24off digital I/O
I2C bus
And here it is running off the back of a Spectranet card.
![[Image: MULTIO1.JPG]](http://www.ianjohnston.com/images/stories/IanJ/ZXspectrummod/MULTIO1.JPG)
Screenshot of test screen:-
![[Image: zxscreen.JPG]](http://www.ianjohnston.com/images/stories/IanJ/ZXspectrumI2C/zxscreen.JPG)
My first ZXBC compiled prog, here's the source code (work in progress). I don't mind it going public, it's only for fun. Couldn't have done it without ZXBC............
Ian.
Code: ' ZX Spectrum Multi IO board
' By Ian Johnston 24/08/2014
' 82C55 Port A = 8off Outputs
' 82C55 Port B = 8off Inputs
' 82C55 Port C = 4off Inputs (lower)
' 4off Outputs (upper)
'
' DAC8574IPW 4ch DAC IC, 16bit
' MCP3424 4ch ADC IC, 12-18bit running in 12bit mode
'
' This code is designed to be compiled to TAP using ZX Basic compiler (www.boriel.com)
#include <input.bas>
' Vars
DIM DacSend(3) AS INTEGER
DIM DacCh(4) AS UInteger
DIM digA AS UInteger: LET digA=0
DIM digB AS UInteger: LET digB=0
DIM A AS UByte: LET A=0
DIM B AS UByte: LET B=0
DIM conv AS UByte: LET conv=0
DIM digout AS UInteger: LET digout=0
DIM AdcReceive(2) AS UByte ' 16bit max with 2 vars
DIM AdcCh AS Float ' 16bit max 0-65535 (this was UInteger but needs to be float for VoltCh)
DIM Adcconfig AS UInteger
DIM Adcval(4) AS Float
DIM Voltch(4) AS Float
DIM Adcchconfig(4) AS UInteger: LET Adcchconfig(1)=184: LET Adcchconfig(2)=216: LET Adcchconfig(3)=248: LET Adcchconfig(4)=152
DIM adc AS UByte=0
DIM dac AS UByte=0
DIM i AS UByte
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' SETUP
' 82C55 ports
OUT 59,131
' temporary settings - all outputs off port A
OUT 11,0
GOSUB turnoffbit
PRINT PAPER 6;AT 0,0;" Multi I/O Board - Ian Johnston "
PRINT AT 1,0;" "
GOSUB pc9564init ' Initialize I2C controller IC
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' MAIN LOOP
mainloop:
IF INKEY$ = "d" THEN GOSUB diginputfromuser: END IF
' DAC
LET dac=dac+1
IF dac=5 THEN LET dac=1: END IF
GOSUB dac8574 ' DAC IC
' ADC
LET adc=adc+1
IF adc=5 THEN LET adc=1: END IF
GOSUB mcp3424chchange ' Config ADC channel
GOSUB mcp3424 ' ADC IC
' Testing only
FOR i=1 TO 4
LET DacCh(i)=DacCh(i)+10 '(i*2)
IF DacCh(i)>=65535 THEN LET DacCh(i)=1: END IF
NEXT i
GOTO mainloop
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Digital outputs - Input from user
diginputfromuser:
PRINT AT 22,0;"8255 Port (A, B or C)"
port$=INPUT (1)
PRINT AT 22,0;"Bit (0 to 7, or 8 for all bits)"
b$=INPUT (1): LET bit = VAL(b$)
PRINT AT 22,0;"On/Off (1 or 0)"
f$=INPUT (1): LET onoff = VAL(f$)
PRINT AT 22,0;" "
IF onoff = 0 THEN BEEP 0.02,20: GOSUB turnoffbit: END IF
IF onoff = 1 THEN BEEP 0.02,20: GOSUB turnonbit: END IF
RETURN
' Turn off bit
turnoffbit:
IF bit=0 THEN LET digB=254: END IF
IF bit=1 THEN LET digB=253: END IF
IF bit=2 THEN LET digB=251: END IF
IF bit=3 THEN LET digB=247: END IF
IF bit=4 THEN LET digB=239: END IF
IF bit=5 THEN LET digB=223: END IF
IF bit=6 THEN LET digB=191: END IF
IF bit=7 THEN LET digB=127: END IF
IF bit=8 THEN LET digB=0: END IF
' Bitwise AND and retain copy of current outputs in digA
LET digout = digA bAND digB: LET digA = digout
IF port$="a" THEN OUT 11,digout: BEEP 0.05,10: END IF
IF port$="b" THEN OUT 27,digout: BEEP 0.05,10: END IF
IF port$="c" THEN OUT 43,digout: BEEP 0.05,10: END IF
LET conv=1: GOSUB binaryconv
PRINT AT 4,0;s$;" Decimal = ";digout;" "
PRINT AT 5,0;"Bit ";bit;" of Port ";port$;" set to ";onoff
RETURN
' Turn on bit
turnonbit:
IF bit=0 THEN LET digB=1: END IF
IF bit=1 THEN LET digB=2: END IF
IF bit=2 THEN LET digB=4: END IF
IF bit=3 THEN LET digB=8: END IF
IF bit=4 THEN LET digB=16: END IF
IF bit=5 THEN LET digB=32: END IF
IF bit=6 THEN LET digB=64: END IF
IF bit=7 THEN LET digB=128: END IF
IF bit=8 THEN LET digB=255: END IF
' Bitwise OR and retain copy of current outputs in digA
LET digout = digA bOR digB: LET digA = digout
IF port$="a" THEN OUT 11,digout: BEEP 0.05,10: END IF
IF port$="b" THEN OUT 27,digout: BEEP 0.05,10: END IF
IF port$="c" THEN OUT 43,digout: BEEP 0.05,10: END IF
LET conv=1: GOSUB binaryconv
PRINT AT 4,0;s$;" Decimal = ";digout;" "
PRINT AT 5,0;"Bit ";bit;" of Port ";port$;" set to ";onoff
RETURN
' Binary conversion, s$ is the output
binaryconv:
LET s$=""
IF conv=0 THEN LET n=A: END IF
IF conv=1 THEN LET n=digout: END IF
LET s$ = ""
binloop:
LET aa = n * 0.5
IF aa = 0 THEN GOTO addzeros: END IF
IF aa > INT aa THEN LET s$ = "1" + s$: LET n = ((n - 1)/2): GOTO binloop: END IF
IF aa <= INT aa THEN LET s$ = "0" + s$: LET n = aa: GOTO binloop: END IF
' IF conv=1 THEN PRINT AT 8,0;s$: END IF
addzeros:
IF LEN s$ = 7 THEN LET s$ = "0" + s$: END IF
IF LEN s$ = 6 THEN LET s$ = "00" + s$: END IF
IF LEN s$ = 5 THEN LET s$ = "000" + s$: END IF
IF LEN s$ = 4 THEN LET s$ = "0000" + s$: END IF
IF LEN s$ = 3 THEN LET s$ = "00000" + s$: END IF
IF LEN s$ = 2 THEN LET s$ = "000000" + s$: END IF
IF LEN s$ = 1 THEN LET s$ = "0000000" + s$: END IF
IF LEN s$ = 0 THEN LET s$ = "00000000": END IF
' PRINT AT 21,0;" "
' IF conv=1 THEN PRINT AT 9,0;s$: END IF
RETURN
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' I2C PCS9564
' Initialize
pc9564init:
OUT 43,0 ' Set PC7 low then high to reset PCA9564 IC
PAUSE 5
OUT 43,128
PAUSE 5
OUT 13,127 ' Timeout function (MSB) enabled = 255, disabled = 127
OUT 45,100 ' PCS9564 I2C address = 0x64 = 100
OUT 61,68 ' Clock freq serial = 0x44 = 68 = 88kHz
RETURN
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' DAC IC = DAC8574
' Master Tx mode
dac8574:
OUT 61,228 ' Start command E4 = 228
' Setup Slave device (Tx mode)
OUT 29,152 ' Load Slave addr + R/W bit = 0 into I2CDAT (DAC8574IPW 0x4c = 76 = 1001100) + R/W bit= 10011000 = 152
OUT 61,196 ' Reset SI and STA bits in I2CCON
' Send 1-byte at a time. Channel codes: 32,34,36,38 then MSB,LSB
' Build LSB (max int 65535)
PRINT AT 8,0;"OUTPUTS"
PRINT AT 8+dac,0;"Ch.";dac;" Raw = ";DacCh(dac);" "
LET A=DacCh(dac): LET B=255
LET A = A bAND B
LET l=A
' Build MSB
LET A=DacCh(dac)/256
LET m=INT A
' Build data array ready for sending to the DAC: CHANNEL, MSB, LSB
IF dac=1 THEN LET DacSend(1)=32: LET DacSend(2)=m: LET DacSend(3)=l: END IF
IF dac=2 THEN LET DacSend(1)=34: LET DacSend(2)=m: LET DacSend(3)=l: END IF
IF dac=3 THEN LET DacSend(1)=36: LET DacSend(2)=m: LET DacSend(3)=l: END IF
IF dac=4 THEN LET DacSend(1)=38: LET DacSend(2)=m: LET DacSend(3)=l: END IF
' Send data
FOR i = 1 TO 3
OUT 29, DacSend(i) ' Load data into I2CDAT, transfer data to DAC
FOR delay=1 to 4: NEXT delay
OUT 61,196 ' Reset SI and STA bits in I2CCON
FOR delay=1 to 4: NEXT delay
'PRINT AT 6,0;dac;" ";DacSend(1)
NEXT i
OUT 61,212 ' Generate stop command, write I2CCON with 0xD4 (212)
RETURN
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ADC IC ADC = MCP3424
' Master Rx mode
mcp3424:
OUT 61,228 ' Start command E4 = 228
' Setup Slave device - receive data from device
OUT 29,211 ' Load Slave addr + R/W bit = 1(read) into I2CDAT (MCP3424 0x69 = 105 = 1101001) + R/W bit= 11010011 = 211
OUT 61,68 ' Reset SI and STA bits in I2CCON (0xC4 = 196), or 68 if AA is set to OFF
FOR delay=1 to 4: NEXT delay
' Receive data
FOR i = 1 TO 2
OUT 61,196 ' Reset SI and STA bits in I2CCON
FOR delay=1 to 4: NEXT delay
LET AdcReceive(i)=IN 29 ' Read byte out
NEXT i
OUT 61,68 ' Reset SI and STA bits in I2CCON
FOR delay=1 to 4: NEXT delay
OUT 61,212 ' Generate stop command, write I2CCON with 0xD4 (212)
Let MSB = AdcReceive(1) * 256 ' <<
Let LSB = AdcReceive(2) bAND 255 ' &
Let AdcCh = MSB bOR LSB ' |
LET Adcval(adc) = AdcCh ' Load 4 channel values on at a time
' PRINT AT 11,0;"Ch.1 Inp = ";AdcCh1;" MSB=";AdcReceive(1);" LSB=";AdcReceive(2);" "
LET Voltch(adc) = Adcval(adc) / 15968
LET Voltch(adc)=Voltch(adc)*100: LET Voltch(adc)=INT(Voltch(adc)): LET Voltch(adc)=Voltch(adc)/100 ' Round down to 2 DP's
PRINT AT 14,0;"INPUTS"
PRINT AT (14+adc),0;"Ch.";adc;" Vdc = ";Voltch(adc);" " ';" ";Adcval(adc);" ";AdcCh;" ";Adcchconfig(adc)
RETURN
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ADC IC ADC = MCP3424
' Master Tx mode (to set up channel config only)
mcp3424chchange:
OUT 61,228 ' Start command E4 = 228
' Setup Slave device (Tx mode)
OUT 29,210 ' Load Slave addr + R/W bit = 0 into I2CDAT (MCP3424 0x69 = 105 = 1101001) + R/W bit= 11010010 = 210
OUT 61,196 ' Reset SI and STA bits in I2CCON
' Send data
PAUSE 1 ' Important pause otherwise the data does not go out on the I2C bus properly.
OUT 29, Adcchconfig(adc) ' configuration byte = initiate,Ch.n,continuous,16-bit,x1Gain
PAUSE 1
OUT 61,196 ' Reset SI and STA bits in I2CCON
PAUSE 1
OUT 61,212 ' Generate stop command, write I2CCON with 0xD4 (212)
' 3910 FOR delay=1 to 4: NEXT delay
RETURN
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OMG!!!!! This is absolutely awesome!! :o :o :o
I want that!
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09-07-2014, 09:49 PM
(This post was last modified: 07-14-2022, 08:07 AM by boriel.)
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10-10-2014, 06:55 PM
(This post was last modified: 07-14-2022, 08:06 AM by boriel.)
Hi all,
Finished project:-
http://www.ianjohnston.com/index.php/pro...-interface
Thanks to Boriel ZX Basic........without it my project would never have happened!
Ian.
![[Image: final5.JPG]](http://www.ianjohnston.com/images/stories/IanJ/ZXspectrummod/final5.JPG)
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excellent! 
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