more i2c and mcp23017

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  1. - 4th October 2024, 03:23 #1
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    Default Re: more i2c and mcp23017

    Deleted, reformulated with complete code in next post.
    Last edited by Demon; - 4th October 2024 at 04:59.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!
  2. - 4th October 2024, 04:57 #2
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    Default Re: more i2c and mcp23017

    I cleaned my code up, so it's really apparent what I'm trying to do.

    I still won't blink the 16 LEDs.

    Code:
    #CONFIG
    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
    __config _CONFIG2, _MCLRE_ON & _PWRTE_OFF & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
    __config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_OFF & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
    __config _CONFIG4, _WRT_OFF & _SCANE_available & _LVP_OFF
    __config _CONFIG5, _CP_OFF & _CPD_OFF
#ENDCONFIG

DEFINE OSC 32

define  CCP1_REG     0              ' Must clear unused CCP pins or else unpredictable results
DEFINE  CCP1_BIT     0
define  CCP2_REG     0
DEFINE  CCP2_BIT     0
DEFINE  CCP3_REG    PORTB
DEFINE  CCP3_BIT     5
define  CCP4_REG     0
DEFINE  CCP4_BIT     0
define  CCP5_REG     0
DEFINE  CCP5_BIT     0

ANSELA = %00000000
ANSELB = %00000000
ANSELC = %00000000
ANSELD = %00000000
ANSELE = %00000000

TRISA = %00000000
TRISB = %00000000
TRISC = %00000000
TRISD = %00000000
TRISE = %00001000

PinSCL2     VAR PortB.1
PinSDA2     VAR PortB.2

    HPWM 3, 8, 1953

addr        var byte : addr      = %01000000        ' $40

IOCONreg    var byte : IOCONreg  = $05
IOCONdat    var byte : IOCONdat  = %10110000
'   bit 7   1 = The registers associated with each port are separated into different banks.
'   bit 6   0 = The INT pins are not connected. INTA is associated with PORTA and INTB is associated with PORTB
'   bit 5   1 = Sequential operation disabled, address pointer does not increment.
'   bit 4   1 = Slew rate disabled
'   bit 3   0 = Disables the MCP23S17 address pins.
'   bit 2   0 = Active driver output (INTPOL bit sets the polarity.)
'   bit 1   0 = Active-low
'   bit 0   Unimplemented: Read as ‘0’

    I2CWRITE PinSDA2,PinSCL2,addr,IOCONreg,[IOCONdat]

IODIRAreg   var byte : IODIRAreg = $00 
IODIRAdat   var byte : IODIRAdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRAreg,[IODIRAdat] 'set GPIOA all output

IODIRBreg   var byte : IODIRBreg = $10
IODIRBdat   var byte : IODIRBdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRBreg,[IODIRBdat] 'set GPIOB all output

GPIOAreg    var byte : GPIOAdat    var byte
GPIOBreg    var byte : GPIOBdat    var byte

LOOOP:
    GPIOAreg    = $09 : GPIOAdat    = %00000000
    I2CWRITE PinSDA2,PinSCL2,addr,GPIOAreg,[GPIOAdat]

    GPIOBreg    = $19 : GPIOBdat    = %00000000
    I2CWRITE PinSDA2,PinSCL2,addr,GPIOBreg,[GPIOBdat]

    pause 250

    GPIOAreg    = $09 : GPIOAdat    = %11111111
    I2CWRITE PinSDA2,PinSCL2,addr,GPIOAreg,[GPIOAdat]

    GPIOBreg    = $19 : GPIOBdat    = %11111111
    I2CWRITE PinSDA2,PinSCL2,addr,GPIOBreg,[GPIOBdat]

    pause 250

    GOTO LOOOP
end

    The HPWM is for a IRFZ44N that i use to pulse the LED grounds. I have a simple LED on it to confirm that it's operating.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!
  3. - 4th October 2024, 05:08 #3
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    Default Re: more i2c and mcp23017

    Tried with OLAT registers, no joy.

    Code:
    #CONFIG
    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
    __config _CONFIG2, _MCLRE_ON & _PWRTE_OFF & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
    __config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_OFF & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
    __config _CONFIG4, _WRT_OFF & _SCANE_available & _LVP_OFF
    __config _CONFIG5, _CP_OFF & _CPD_OFF
#ENDCONFIG

DEFINE OSC 32

define  CCP1_REG     0              ' Must clear unused CCP pins or else unpredictable results
DEFINE  CCP1_BIT     0
define  CCP2_REG     0
DEFINE  CCP2_BIT     0
DEFINE  CCP3_REG    PORTB
DEFINE  CCP3_BIT     5
define  CCP4_REG     0
DEFINE  CCP4_BIT     0
define  CCP5_REG     0
DEFINE  CCP5_BIT     0

ANSELA = %00000000
ANSELB = %00000000
ANSELC = %00000000
ANSELD = %00000000
ANSELE = %00000000

TRISA = %00000000
TRISB = %00000000
TRISC = %00000000
TRISD = %00000000
TRISE = %00001000

PinSCL2     VAR PortB.1
PinSDA2     VAR PortB.2

    HPWM 3, 8, 1953

addr        var byte : addr      = %01000000        ' $40

IOCONreg    var byte : IOCONreg  = $05
IOCONdat    var byte : IOCONdat  = %10110000
'   bit 7   1 = The registers associated with each port are separated into different banks.
'   bit 6   0 = The INT pins are not connected. INTA is associated with PORTA and INTB is associated with PORTB
'   bit 5   1 = Sequential operation disabled, address pointer does not increment.
'   bit 4   1 = Slew rate disabled
'   bit 3   0 = Disables the MCP23S17 address pins.
'   bit 2   0 = Active driver output (INTPOL bit sets the polarity.)
'   bit 1   0 = Active-low
'   bit 0   Unimplemented: Read as ‘0’

    I2CWRITE PinSDA2,PinSCL2,addr,IOCONreg,[IOCONdat]

IODIRAreg   var byte : IODIRAreg = $00 
IODIRAdat   var byte : IODIRAdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRAreg,[IODIRAdat] 'set GPIOA all output

IODIRBreg   var byte : IODIRBreg = $10
IODIRBdat   var byte : IODIRBdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRBreg,[IODIRBdat] 'set GPIOB all output

OLATAreg    var byte : OLATAdat    var byte
OLATBreg    var byte : OLATBdat    var byte

LOOOP:
    OLATAreg    = $0A : OLATAdat    = %00000000
    I2CWRITE PinSDA2,PinSCL2,addr,OLATAreg,[OLATAdat]

    OLATBreg    = $1A : OLATBdat    = %00000000
    I2CWRITE PinSDA2,PinSCL2,addr,OLATBreg,[OLATBdat]

    pause 250

    OLATAreg    = $0A : OLATAdat    = %11111111
    I2CWRITE PinSDA2,PinSCL2,addr,OLATAreg,[OLATAdat]

    OLATBreg    = $1A : OLATBdat    = %11111111
    I2CWRITE PinSDA2,PinSCL2,addr,OLATBreg,[OLATBdat]

    pause 250

    GOTO LOOOP
end
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!
  4. - 4th October 2024, 05:10 #4
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    Default Re: more i2c and mcp23017

    It won't let me add info to my previous post above:

    16F18877
    MCP23017

    Using 1K/130pF on SCL/SDA as mentioned on p.5 of datasheet (they use 135pF).
    Last edited by Demon; - 4th October 2024 at 05:16.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!
  5. - 4th October 2024, 05:47 #5
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    Default Re: more i2c and mcp23017

    I didn't quite understand what they meant with the Bank A/B at first.

    I've now tried with both versions, and still no blinky.

    Code:
    #CONFIG
    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
    __config _CONFIG2, _MCLRE_ON & _PWRTE_OFF & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
    __config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_OFF & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
    __config _CONFIG4, _WRT_OFF & _SCANE_available & _LVP_OFF
    __config _CONFIG5, _CP_OFF & _CPD_OFF
#ENDCONFIG

DEFINE OSC 32

define  CCP1_REG     0              ' Must clear unused CCP pins or else unpredictable results
DEFINE  CCP1_BIT     0
define  CCP2_REG     0
DEFINE  CCP2_BIT     0
DEFINE  CCP3_REG    PORTB
DEFINE  CCP3_BIT     5
define  CCP4_REG     0
DEFINE  CCP4_BIT     0
define  CCP5_REG     0
DEFINE  CCP5_BIT     0

ANSELA = %00000000
ANSELB = %00000000
ANSELC = %00000000
ANSELD = %00000000
ANSELE = %00000000

TRISA = %00000000
TRISB = %00000000
TRISC = %00000000
TRISD = %00000000
TRISE = %00001000

PinSCL2     VAR PortB.1
PinSDA2     VAR PortB.2

    HPWM 3, 8, 1953

addr        var byte : addr      = %01000000        ' $40

IOCONreg    var byte : IOCONreg  = $05
IOCONdat    var byte : IOCONdat  = %00110000      ' Bank=0
'IOCONdat    var byte : IOCONdat  = %10110000      ' Bank=1
'   bit 7   1 = The registers associated with each port are separated into different banks.
'   bit 6   0 = The INT pins are not connected. INTA is associated with PORTA and INTB is associated with PORTB
'   bit 5   1 = Sequential operation disabled, address pointer does not increment.
'   bit 4   1 = Slew rate disabled
'   bit 3   0 = Disables the MCP23S17 address pins.
'   bit 2   0 = Active driver output (INTPOL bit sets the polarity.)
'   bit 1   0 = Active-low
'   bit 0   Unimplemented: Read as ‘0’

    I2CWRITE PinSDA2,PinSCL2,addr,IOCONreg,[IOCONdat] : pauseus 1

IODIRAreg   var byte : IODIRAreg = $00      ' Bank=0 
'IODIRAreg   var byte : IODIRAreg = $00      ' Bank=1  
IODIRAdat   var byte : IODIRAdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRAreg,[IODIRAdat] : pauseus 1 'set GPIOA all output

IODIRBreg   var byte : IODIRBreg = $01      ' Bank=0 
'IODIRBreg   var byte : IODIRBreg = $10      ' Bank=1 
IODIRBdat   var byte : IODIRBdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRBreg,[IODIRBdat] : pauseus 1 'set GPIOB all output

OLATAreg    var byte : OLATAdat    var byte
OLATBreg    var byte : OLATBdat    var byte

LOOOP:
    OLATAreg    = $14 : OLATAdat    = %00000000      ' Bank=0
'    OLATAreg    = $0A : OLATAdat    = %00000000      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATAreg,[OLATAdat] : pauseus 1

    OLATBreg    = $15 : OLATBdat    = %00000000      ' Bank=0
'    OLATBreg    = $1A : OLATBdat    = %00000000      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATBreg,[OLATBdat] : pauseus 1

    pause 250

    OLATAreg    = $14 : OLATAdat    = %11111111      ' Bank=0
'    OLATAreg    = $0A : OLATAdat    = %11111111      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATAreg,[OLATAdat] : pauseus 1

    OLATBreg    = $15 : OLATBdat    = %11111111      ' Bank=0
'    OLATBreg    = $1A : OLATBdat    = %11111111      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATBreg,[OLATBdat] : pauseus 1

    pause 250

    GOTO LOOOP
end
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!
  6. - 4th October 2024, 06:07 #6
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    Default Re: more i2c and mcp23017

    Argh, won't let me add a comment.

    Apparently I still hadn't understood how I'm supposed to set the register for IOCON.

    Latest attempt, still no workie.

    Code:
    #CONFIG
    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
    __config _CONFIG2, _MCLRE_ON & _PWRTE_OFF & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
    __config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_OFF & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
    __config _CONFIG4, _WRT_OFF & _SCANE_available & _LVP_OFF
    __config _CONFIG5, _CP_OFF & _CPD_OFF
#ENDCONFIG

DEFINE OSC 32

define  CCP1_REG     0              ' Must clear unused CCP pins or else unpredictable results
DEFINE  CCP1_BIT     0
define  CCP2_REG     0
DEFINE  CCP2_BIT     0
DEFINE  CCP3_REG    PORTB
DEFINE  CCP3_BIT     5
define  CCP4_REG     0
DEFINE  CCP4_BIT     0
define  CCP5_REG     0
DEFINE  CCP5_BIT     0

ANSELA = %00000000
ANSELB = %00000000
ANSELC = %00000000
ANSELD = %00000000
ANSELE = %00000000

TRISA = %00000000
TRISB = %00000000
TRISC = %00000000
TRISD = %00000000
TRISE = %00001000

PinSCL2     VAR PortB.1
PinSDA2     VAR PortB.2

    HPWM 3, 8, 1953

addr        var byte : addr      = %01000000        ' $40

IOCONAreg    var byte : IOCONAreg  = $0A        ' Bank=0
IOCONBreg    var byte : IOCONBreg  = $0B        ' Bank=0
IOCONdat    var byte : IOCONdat  = %00110000    ' Bank=0
'IOCONAreg    var byte : IOCONAreg  = $05        ' Bank=1
'IOCONBreg    var byte : IOCONBreg  = $15        ' Bank=1
'IOCONdat    var byte : IOCONdat  = %10110000    ' Bank=1
'   bit 7   0 = The registers associated with each port are separated into different banks.
'   bit 6   0 = The INT pins are not connected. INTA is associated with PORTA and INTB is associated with PORTB
'   bit 5   1 = Sequential operation disabled, address pointer does not increment.
'   bit 4   1 = Slew rate disabled
'   bit 3   0 = Disables the MCP23S17 address pins.
'   bit 2   0 = Active driver output (INTPOL bit sets the polarity.)
'   bit 1   0 = Active-low
'   bit 0   Unimplemented: Read as ‘0’

    I2CWRITE PinSDA2,PinSCL2,addr,IOCONAreg,[IOCONdat]
    I2CWRITE PinSDA2,PinSCL2,addr,IOCONBreg,[IOCONdat]

IODIRAreg   var byte : IODIRAreg = $00      ' Bank=0 
'IODIRAreg   var byte : IODIRAreg = $00      ' Bank=1  
IODIRAdat   var byte : IODIRAdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRAreg,[IODIRAdat] 'set GPIOA all output

IODIRBreg   var byte : IODIRBreg = $01      ' Bank=0 
'IODIRBreg   var byte : IODIRBreg = $10      ' Bank=1 
IODIRBdat   var byte : IODIRBdat = %00000000

    I2CWRITE PinSDA2,PinSCL2,addr,IODIRBreg,[IODIRBdat] 'set GPIOB all output

OLATAreg    var byte : OLATAdat    var byte
OLATBreg    var byte : OLATBdat    var byte

LOOOP:
    OLATAreg    = $14 : OLATAdat    = %00000000      ' Bank=0
'    OLATAreg    = $0A : OLATAdat    = %00000000      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATAreg,[OLATAdat]

    OLATBreg    = $15 : OLATBdat    = %00000000      ' Bank=0
'    OLATBreg    = $1A : OLATBdat    = %00000000      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATBreg,[OLATBdat]

    pause 250

    OLATAreg    = $14 : OLATAdat    = %11111111      ' Bank=0
'    OLATAreg    = $0A : OLATAdat    = %11111111      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATAreg,[OLATAdat]

    OLATBreg    = $15 : OLATBdat    = %11111111      ' Bank=0
'    OLATBreg    = $1A : OLATBdat    = %11111111      ' Bank=1
    I2CWRITE PinSDA2,PinSCL2,addr,OLATBreg,[OLATBdat]

    pause 250

    GOTO LOOOP
end
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!
  7. - 4th October 2024, 14:25 #7
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    Default Re: more i2c and mcp23017

    For the MCP23017 28-pin DIP package make sure you have connections to:
    RESETn (pin 18)
    A2, A1, A0 (pins 17, 16, 15) - these should be pulled low (GND) for address $40... they should not be left floating

    There should also be pullups to VDD on SCL (pin 12) and SDA (pin 13)
  8. - 4th October 2024, 06:07 #8
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    Default Re: more i2c and mcp23017

    The example you refer to used and expected iocon.bank to = 1 , why i chose that and how it got that way are lost into the mystery of time. [probably some weird dev board]
    this simulates ok for bank=0

    Code:
    #CONFIG    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
    __config _CONFIG2, _MCLRE_ON & _PWRTE_OFF & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF
    __config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_ON & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
    __config _CONFIG4, _WRT_OFF & _SCANE_available & _LVP_ON
    __config _CONFIG5, _CP_OFF & _CPD_OFF
#ENDCONFIG


DEFINE OSC 32
ANSELB = 0
PinSCL2     VAR PortB.1
PinSDA2     VAR PortB.2
GPIOAdat    var byte
GPIOBdat    var byte
addr        var byte 
reg   var byte 
dat   var byte 


addr      = %01000000        ' $40


; UNCOMMENT EITHER SECTION BANK=0 OR BANK=1     NOT BOTH






;START IOCON.BANK=0


reg = 0
dat = 0


I2CWRITE PinSDA2,PinSCL2,addr,reg,[dat] 'set GPIOA all output


reg = 1
dat = 0


I2CWRITE PinSDA2,PinSCL2,addr,reg,[dat] 'set GPIOB all output






LOOOP:
    reg    = $12 : GPIOAdat    = %00000000
    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOAdat]


    reg    = $13      : GPIOBdat    = %00000000
    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOBdat]


    pause 250


    reg    = $12 : GPIOAdat    = %11111111
    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOAdat]


    reg    = $13 : GPIOBdat    = %11111111
    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOBdat]


    pause 250


    GOTO LOOOP
end   ;IOCON.BANK=0








 ;START IOCON.BANK=1  ; NOT TESTED BANK=1 NOT SUPPORTED IN SIMULATOR
'reg = $A
'dat = %10100000
'I2CWRITE PinSDA2,PinSCL2,addr,reg,[dat]


 
'reg = 0
'dat = 0


'I2CWRITE PinSDA2,PinSCL2,addr,reg,[dat] 'set GPIOA all output


'reg = $10
'dat = 0


'I2CWRITE PinSDA2,PinSCL2,addr,reg,[dat] 'set GPIOB all output






'LOOOP:
'    reg    = $9 : GPIOAdat    = %00000000
'    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOAdat]


'    reg    = $19      : GPIOBdat    = %00000000
'    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOBdat]


'    pause 250


'    reg    = $9 : GPIOAdat    = %11111111
'    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOAdat]


'    reg    = $19 : GPIOBdat    = %11111111
'    I2CWRITE PinSDA2,PinSCL2,addr,reg,[GPIOBdat]


'    pause 250


'    GOTO LOOOP
'end     ;IOCON.BANK=1
    Warning I'm not a teacher
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