MCP4161 - Digital Pot

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r_teixeir
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MCP4161 - Digital Pot

Postby r_teixeir » Tue May 28, 2019 3:09 am

Hi all, can anybody help with a new componente for mcp4161 digital pot?

I appreciate

Thanks Rod

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Benj
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Re: MCP4161 - Digital Pot

Postby Benj » Wed May 29, 2019 9:35 am

Hi Rod,

Yes this should be fairly easy. I'll have a look for you.

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Re: MCP4161 - Digital Pot

Postby Benj » Wed May 29, 2019 10:05 am

It should now be available via the update system, let me know how you get on.

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Wed May 29, 2019 2:25 pm

Thanks, Benj. I´ll run tests and let you know. Ill use with the lcd_mini click.

Thanks

Rod

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Thu May 30, 2019 12:55 am

Benj thanks for the update of the mcp4161. I have a doubt concerning the lcd-mini click. The click has a digpot, a mcp23S17 and a lcd on a BL-0106. My question is, Looking at the way they are connected by using DSPic BL-0032, they only share one port. Iam using in this case PortD(0-7). How can I use two(chip select) from spi comm by using this board(BL0032)?
It is pretty clear to me that when I use lcd-mini click on mikroe board, its board shares different pins from other ports, so I can use right out of the box. But when I use the BL0032 it shares only one port and it is dificult for me to visualize how to share other pins if I dont have access to other ports.

Correct me if iam wrong, but I ve just bought BL-117 and BL0161 so I can have access to the other pins and be able to drive the click.

Maybe it is easy to show you with a Picture attached.

Thanks for any thoughts

Rod
Attachments
Mikrobus_clicks.jpg
Mikrobus_clicks.jpg (96.54 KiB) Viewed 1704 times
LDD_Mini_Click.jpg
LDD_Mini_Click.jpg (97.25 KiB) Viewed 1704 times

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Re: MCP4161 - Digital Pot

Postby LeighM » Thu May 30, 2019 8:38 am

Hi,
If you have a look at the circuit diagram for BL0106 the SPI connections are directly compatible with the MCP23S17 port expander,
with chip select on port pin 2.
The MCP4161 digital potentiometer chip select is on the Click pin 1 which connects with the BL0106 "ANA" connector,
but this is not directly accessible on the port.
So I suggest that you connect a wire (underside of the BL0106, or top side of the click board) from the click pin 1 to another unused click pin such as pin 14,
this will then make the chip select for the MCP4161 available on the port pin 1
Hope that helps
Leigh

LCD mini click.png
LCD mini click.png (54.23 KiB) Viewed 1696 times

BL0106.png
BL0106.png (14.88 KiB) Viewed 1695 times

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Fri May 31, 2019 3:03 am

Hi leighM, thanks for responding, Ive done the connections sligtly diferente. I used another BL106 and connected in to rx and you proposed on last post using PortE.
My question now is related to the programming. In the hello world available provided by mikroe, I see the usage of a library for SPI_LCD because the specification of LCD is a LMB162XFW is a 2x16 LCD display with a deep blue display color, and light yellow green display data. The interface is in SPI. I couldnt find this componente available in our display source(Flowcode). Is there anybody out there kind enough to do this component for me please?
Iam stuck on this coding and I really would like to make this work.

Thanks for the support

I appreciate

Rod

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Sat Jun 01, 2019 3:44 am

Hi all,
I openned a ticked to mikroe related to lcd-mini if it is a spi interface as it is written on the specification of the website. Analysing the connection of the lcd to expander, it looks like it is a regular lcd using the portb of the mcp23s17. While we wait for mikroe's answer, i was thinking about the connection of the lcd componente and its coding that i should consider on the programming. It is hard to visualize how to send commands to write a simple command of printing a string to lcd, considering that I dont know how to connect on software to the portB of the expander. Does anybody have a hint for this issue?

Thanks

Rod
Attachments
LCD_Mini_Click_Part2.fcfx
(11.65 KiB) Downloaded 28 times

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Sun Jun 09, 2019 3:02 am

Hello all,
Well, for the last week Ive been trying to work on this program and I find it really hard. After trying many ways of figuring out how to interface the lcd with the components(MCP4161, MCP23S17 and pwm), and none of them worked out, Ive had the idea of replicating the xc8 hello world from code configurator into flowcode. Well I can tell you that is not easy at all. It is hard to combine the graphical componentes, coding at the same time and reverse engineering between C and flowchart. Ive had some results (good) but no writing on the lcd.
I attached both of the programs(XC8 and flowcode).

If anybody could give a hint if iam on the right track, that would be great.

Thanks a million

Rod
Attachments
LCD_Mini_Mikroe.X.7z
(108.78 KiB) Downloaded 31 times
LCD_Mini_Click_Part4.fcfx
(36.39 KiB) Downloaded 32 times

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Re: MCP4161 - Digital Pot

Postby Benj » Mon Jun 10, 2019 1:10 pm

Hi Rod,

We have a plan for the future to be able to drive I/O expander pins as if they were micro pins and hence components will be able to connect to these virtualised pins. Unfortunately we cannot do this currently and so it becomes fairly tricky.

Do you have access to an Arduino library that will work with the board. Maybe we can turn this into a component for you? I do have a similar component for an alphanumeric LCD behind a I2C I/O expander. Maybe we can do the same thing for the SPI expander?

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Mon Jun 10, 2019 6:09 pm

Hi Benj, thanks for answering. I do not have a library for arduino, but instead I do have a written and solved application that worked for a pic18F8722 and PICDEM PIC18 Explorer and It connects to its LCM-S01602 DTR/m display via the MCP23S17 port expander. I found this example on mcu website and I found it interesting and iam working on it to see if I can do the same for flowcode. Things that i have to consider while designing:

Inclusion of the mcp4161 (Digital pot)
Inclusion of LCD-Display LMB162XFW which has a different initialisation time than the models PICDEM PIC18 EXPLORER and HD44780

Here is the code and believe that if we can somehow pipe commands through the SPI expander channel setup, it migh work.

The idea of having a spi lcd component is great, it might work, and that is what i was trying to somehow do.

Thanks again Benj

Code: Select all

// Port Expander module connections
sbit  SPExpanderRST at RF6_bit;
sbit  SPExpanderCS  at RA2_bit;
sbit  SPExpanderRST_Direction at TRISF6_bit;
sbit  SPExpanderCS_Direction  at TRISA2_bit;
// End Port Expander module connections

sbit  LCD_RST at RF6_bit;
sbit  LCD_CS  at RA2_bit;
sbit  LCD_RST_TRIS at TRISF6_bit;
sbit  LCD_CS_TRIS  at TRISA2_bit;

sbit  LCD_SCK_TRIS at TRISC3_bit;
sbit  LCD_SDO_TRIS at TRISC5_bit;

//extern void Delay(void);
//extern void SDelay(void);

//*****************************************************************
// Write to MCP923S17 Port A
//*****************************************************************
void WritePortA(char b)
{
        Expander_Write_PortA(0, b);
}
//*****************************************************************
// Write to MCP923S17 Port B
//*****************************************************************
void WritePortB(char b)
{
        Expander_Write_PortB(0, b);
}
//*****************************************************************
// Write the data to the display
//*****************************************************************
void d_write(char b)
{
        WritePortA(0x80);
        Delay_ms(10);
        WritePortB(b);
        Nop();
        Nop();
        Nop();
        Nop();
        WritePortA(0xC0);
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        WritePortA(0x00);
        //TXREG = b;                        //carriage return
        //while(!LCD_TXSTA_TRMT);                //wait for data TX
        //LCD_TXSTA_TRMT = 0;
}
//*****************************************************************
// Send a instruction to the display
//*****************************************************************
void i_write(char b)
{
        WritePortA(0x00);
        Delay_ms(10);
        WritePortB(b);
        Nop();
        Nop();
        Nop();
        Nop();
        WritePortA(0x40);
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        WritePortA(0x00);
}
//*****************************************************************
// Write to line 1 of the display
//*****************************************************************
void LCDLine_1(void)
{
        i_write(0x80);
}
//*****************************************************************
// Write to line 1 of the display
//*****************************************************************
void LCDLine_2(void)
{
        i_write(0xC0);
}
//*****************************************************************
// To clear the display
//*****************************************************************
void LCDClear(void)
{
        i_write(0x01);
}
//******************************************************************
// Function to write to the PORT
//******************************************************************
void InitWrite(char b)
{
        WritePortA(0);
        WritePortB(b);
        Nop();
        Nop();
        Nop();
        WritePortA(0x40);
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        Nop();
        WritePortA(0);
}

//******************************************************************
// LCD Initialization function
//******************************************************************
void LCDInit(void)
{
        LCD_CS_TRIS = 0;
        LCD_CS = 1;
        Delay_ms(10);
        Delay_ms(10);
        Delay_ms(10);

        LCD_RST_TRIS = 0;
        LCD_RST = 0;
        Delay_ms(10);
        LCD_RST = 1;

        SPI1_Init();
        Expander_Init(0);
        Expander_Set_DirectionPortA(0,0x00);  // Set Expander's PORTA to be output
        Expander_Set_DirectionPortB(0,0x00);   // Set Expander's PORTB to be output

        WritePortA(0);

        Delay_ms(10);
        InitWrite(0x3C);                                //0011NFxx

        Delay_ms(10);
        InitWrite(0x0C);                                //Display Off

        Delay_ms(10);
        InitWrite(0x01);                                //Display Clear

        Delay_ms(10);
        InitWrite(0x06);                                //Entry mode
}

void main(void)
{
          // Initialize the LCD display.
        LCDInit();

        // Switch ti LCD line 1 ( sends a command to the LCD to tell it ).
        LCDLine_1();

        // Write the data one char at a time.
        d_write('T');

        d_write('H');

        d_write('A');

        d_write('N');

        d_write('K');
       
        d_write('S');
       
        LCDLine_2();
       
        d_write('B');
       
        d_write('I');
        d_write('G');
        d_write(' ');
        d_write('D');
        d_write('O');
        d_write('G');

        while(1);

}

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Re: MCP4161 - Digital Pot

Postby r_teixeir » Tue Jun 11, 2019 5:13 pm

Hi benj, i found the library for arduino using the lcd mini click. I Hope it helps creating the component.

Here is the link:

https://github.com/Electronza/MIKROE_LCDmini

Thanks a lot

Rod