CODESYS Forge - CODESYS Forge / Talk / Runtime 🇬🇧: Raspberry Pi MC SL with MCP23017

oliverboswall - 2019-12-20

Hello Everyone,

I am a new user here and I have a raspberry Pi 3 model B which I have installed CODESYS Control for Raspberry Pi MC SL. I am trying to communicate with the MCP23017 chip using i2c. I have downloaded the library, and driver as well as the sample code but I am not able to get it to work - thus any help would be greatly appreciated.

I have managed to communicate with the MCP23017 chip using the raspberry pi terminal itself using the code

$ i2cset -y 1 0x20 0x00 0x00 (this code on the pi declares all pins of Bank A (GPA) as outputs)
$ i2cset -y 1 0x20 0x14 0x01 (this code on the pi turns on the 1st led on channel A)

I have been trying to replicate this in codesys but its not working and I am quite lost. If anyone has some tips please contact me.

Kind regards, Oliver

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Anonymous - 2019-12-21

Originally created by: phenixrb

hello oliver,
Codesys does not manage MCP23017 in I2C, but MCP23S17 in SPI.

l viewtopic.php?f=23&t=6247 l

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i-campbell - 2019-12-21

Hello, in my brief search I couldn't find your exact Codesys driver.

You can make your own though, here is the documentation.
https://forge.codesys.com/drv/io-drivers/doc/I2C/

If you decide to develop your driver on forge.codesys.com, there is a wonderful community to help when you are stuck.

Let me know if there are any specific questions about the process, or of course you can ask there.

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eschwellinger - 2019-12-28

Hi,
you could give the driver from the section here a try:
l viewtopic.php?f=23&t=5872 l
or is it what you have already done?

This section will move to forge too...next
BR
Edwin

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oliverboswall - 2019-12-30

Hello everyone,

Sorry for my late response - hope you all had a lovely Christmas.

Yes I downloaded that driver, library and sample code from that thread Edwin but I was not able to get any response. I think I am missing something trivial but such as setting the GPIO to an input/output but I am not able to see the i2c gpio in codesys. Is this correct?

If anyone has 30 minutes (or any time at all) to have a quick run through of what I have already done and give some advice I would greatly appreciate it.

I look forward to hearing from you

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eschwellinger - 2019-12-31

Hi,
no mapping is needed for I2C on the GPIO's.
Did you enable I2C by using CLI?

sudo raspi-config
That's basically the only thing which is needed.

You could check your device by:
i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
If this works CODESYS should work with the I2C too.

BR
Edwin

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JJoe - 2020-01-13

Hello
from time to time I trying to work with the MCP23017. I have no problem to use the MCP ports as inputs but until now I was not able to use the MCP ports as outputs (e.g. to control a LED).
Regards
JJoe

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JJoe - 2020-01-13

Sorry I forgot my Codesys code:
MCP23017_0x24.OUT_A:=16#00; //Porta --> Output
MCP23017_0x24.OUT_B:=16#FF; //PortB --> Input
GVL.xPB:=MCP23017_0x24.IN_B.0;

IF NOT GVL.xPB THEN
MCP23017_0x24.OUT_A.0:=TRUE;
MCP23017_0x24.OUT_A.1:=TRUE;
MCP23017_0x24.OUT_A.2:=TRUE;
MCP23017_0x24.OUT_A.3:=TRUE;
MCP23017_0x24.OUT_A.4:=TRUE;
MCP23017_0x24.OUT_A.5:=TRUE;
MCP23017_0x24.OUT_A.6:=TRUE;
MCP23017_0x24.OUT_A.7:=TRUE;
END_IF

IF GVL.xPB THEN
MCP23017_0x24.OUT_A.0:=FALSE;
MCP23017_0x24.OUT_A.1:=FALSE;
MCP23017_0x24.OUT_A.2:=FALSE;
MCP23017_0x24.OUT_A.3:=FALSE;
MCP23017_0x24.OUT_A.4:=FALSE;
MCP23017_0x24.OUT_A.5:=FALSE;
MCP23017_0x24.OUT_A.6:=FALSE;
MCP23017_0x24.OUT_A.7:=FALSE;
END_IF

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razvoj - 2020-09-17

Hello,

I have used this library and this example to use the MCP23017 as digital outputs, but there is no change on IO pins when I change the state (always 5V on pins).

Why is there no change on pins?

Regards

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Because there is something wrong with the initalization andthe preconfigured values (inputs) from the library are used.

I found solutions for the issue "not being able to change the outputs, before a dump via linux shell":

quick and dirty: change the preconfigured value in the library for your needs. Use 16#FF for Inputs and 16#00 for outputs:

IO_A : BYTE := 16#FF;
IO_B : BYTE := 16#FF;

more usually one: reinitialize the port configuration on request. Add this code in the library to the case structure in the FB:

10:
    IF REINIT THEN
        _iState := 0;
    END_IF

Additionally you have to trigger/request the reinitialization of the configuration after the device is "operational". And if you want to you can change the polarity and wether the Port A/B is configured as input or output during runtime. Add this code or parts of it to your project:
Declaration:

RTRIG_operational: R_TRIG;
xInitialized: BOOL;
xReinitialze: BOOL;
xSwitchIO: BOOL;
xSwitchIO_old: BOOL;
xInputPolarity: BOOL;
xInputPolarity_old: BOOL;

Button_1: BOOL;
Button_2: BOOL;
Button_3: BOOL;
Button_4: BOOL;
Button_5: BOOL;
Button_6: BOOL;
Button_7: BOOL;
Button_8: BOOL;

Rele_1: BOOL;
Rele_2: BOOL;
Rele_3: BOOL;
Rele_4: BOOL;
Rele_5: BOOL;
Rele_6: BOOL;
Rele_7: BOOL;
Rele_8: BOOL;

Code:

RTRIG_operational(CLK:=MCP23017.Operational);

IF NOT xInitialized AND RTRIG_operational.Q THEN
    xReinitialze := TRUE;
    xInitialized := TRUE;
END_IF

IF xSwitchIO <> xSwitchIO_old THEN
    xReinitialze := TRUE;
    xSwitchIO_old := xSwitchIO;
END_IF

IF xInputPolarity <> xInputPolarity_old THEN
    xReinitialze := TRUE;
    xInputPolarity_old := xInputPolarity;
END_IF

IF xReinitialze THEN
    IF NOT xSwitchIO THEN
        MCP23017.IO_A := 16#FF; // Input
        MCP23017.IO_B := 16#00; // Output
    ELSE
        MCP23017.IO_A := 16#00; // Output
        MCP23017.IO_B := 16#FF; // Input
    END_IF
    IF NOT xInputPolarity THEN
        MCP23017.IPOL_A := 16#00;   // Same
        MCP23017.IPOL_B := 16#00;   // Same
    ELSE
        MCP23017.IPOL_A := 16#FF;   // Opposite
        MCP23017.IPOL_B := 16#FF;   // Opposite
    END_IF
    MCP23017.REINIT := TRUE;
    xReinitialze := FALSE;
END_IF

IF NOT MCP23017.REINIT THEN
    IF NOT xSwitchIO THEN
        Button_1 := MCP23017.IN_A.0;
        Button_2 := MCP23017.IN_A.1;
        Button_3 := MCP23017.IN_A.2;
        Button_4 := MCP23017.IN_A.3;
        Button_5 := MCP23017.IN_A.4;
        Button_6 := MCP23017.IN_A.5;
        Button_7 := MCP23017.IN_A.6;
        Button_8 := MCP23017.IN_A.7;

        MCP23017.OUT_B.0 := Rele_1;
        MCP23017.OUT_B.1 := Rele_2;
        MCP23017.OUT_B.2 := Rele_3;
        MCP23017.OUT_B.3 := Rele_4;
        MCP23017.OUT_B.4 := Rele_5;
        MCP23017.OUT_B.5 := Rele_6;
        MCP23017.OUT_B.6 := Rele_7;
        MCP23017.OUT_B.7 := Rele_8;
    ELSE
        MCP23017.OUT_A.0 := Rele_1;
        MCP23017.OUT_A.1 := Rele_2;
        MCP23017.OUT_A.2 := Rele_3;
        MCP23017.OUT_A.3 := Rele_4;
        MCP23017.OUT_A.4 := Rele_5;
        MCP23017.OUT_A.5 := Rele_6;
        MCP23017.OUT_A.6 := Rele_7;
        MCP23017.OUT_A.7 := Rele_8;

        Button_1 := MCP23017.IN_B.0;
        Button_2 := MCP23017.IN_B.1;
        Button_3 := MCP23017.IN_B.2;
        Button_4 := MCP23017.IN_B.3;
        Button_5 := MCP23017.IN_B.4;
        Button_6 := MCP23017.IN_B.5;
        Button_7 := MCP23017.IN_B.6;
        Button_8 := MCP23017.IN_B.7;
    END_IF
END_IF

I tested this positively with the old library (posted from eschwellinger at 2021-11-27 https://forge.codesys.com/forge/talk/Runtime/thread/8981ce928a/?page=1&limit=25#1cc1) and with the new library (posted from elconfa at 2019-01-10 https://forge.codesys.com/forge/talk/Runtime/thread/a2dd4dd45f/#774c). Finally, I extended the new library so that the polarity switching of the inputs can be controlled with a variable:
Declaration:

IPOL_A: BYTE := 16#00;  // Port A configuration: 0=same/1=opposite (INPUT POLARITY PORT REGISTER)
IPOL_B: BYTE := 16#00;  // Port B configuration: 0=same/1=opposite (INPUT POLARITY PORT REGISTER)

Code:

STATE := STATE AND write8(16#02,IPOL_A);    //  IPOL: INPUT POLARITY PORT REGISTER
                        //      1=GPIO register bit reflects the opposite logic state of the input pin.
                        //      0=GPIO register bit reflects the same logic state of the input pin.
STATE := STATE AND write8(16#03,IPOL_B);    //  IPOL: INPUT POLARITY PORT REGISTER
                        //      1=GPIO register bit reflects the opposite logic state of the input pin.
                        //      0=GPIO register bit reflects the same logic state of the input pin.

I2C_MCP23017.library

MCP23017.devdesc.xml

rubendijk - 2023-04-04

Nice job, What am I doing wrong here? I added the device and library. When adding the module it says the following.

Last edit: rubendijk 2023-04-04

MCP23017.png

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Raspberry Pi MC SL with MCP23017