3 replies to this topic

[Gino Geusens]

Hello everyone,

 

Let me begin by saying that i:

• am a complete beginner at programming and the entire duino familiy.
• and i am not a native engish speaker, so i am sorry for any inconsistancies.
• am not new to electronics, that is why i want to start with some more versatile sollutions as well.

i aquired several adafruit i2c matrix display's

 

http://learn.adafrui.../1-2-8x8-matrix

http://www.adafruit....051#Description

 

and am trying to make a driver that works with it, and failling horribly at it

 

i made this as simple as possible just to try and see if i can get the display to light up.

 

it doesnt work.

using System;using System.Net;using System.Net.Sockets;using System.Threading;using Microsoft.SPOT;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware;using SecretLabs.NETMF.Hardware.Netduino;namespace I2C_matrix_display_test{    public class Program    {        public static void Main()        {            var MatrixDisplay1 = new I2CDevice(new I2CDevice.Configuration(0x70,100));            byte Oscillator = 0x21; // turn on oscillator            byte SetDisplay = 0x81; //enable display, no blink            byte SetBrightness = 0xEF; //Full brightness            byte Address = 0x00; // first write adress            byte WriteData = 0xFF; // Display data            byte[] EnableOscillator = { Oscillator };            byte[] EnableDisplay = { SetDisplay };            byte[] Brightness = { SetBrightness };            byte[] WriteToFirstAddress = { Address };            byte[] WriteToDisplay = { WriteData };            I2CDevice.I2CTransaction[] ActionWrite = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(EnableOscillator),                I2CDevice.CreateWriteTransaction(EnableDisplay),                I2CDevice.CreateWriteTransaction(Brightness),                I2CDevice.CreateWriteTransaction(WriteToFirstAddress),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),                I2CDevice.CreateWriteTransaction(WriteToDisplay),            };            MatrixDisplay1.Execute(ActionWrite, 1000);        }    }}

according to the origina C++ source

https://github.com/a...ackpack-Library

i should in the following steps get something

• enable oscillator
• enable display
• set brightness
• point to the write address
• fill with data

 

can someone point me in the right direction where to look next ? because im not very famlilar with c++ code as well

 

or if someone knows of a pre existing driver (i searched but found nothing).

 

extra info:

 

[*]i have a netduino plus 2 with the latest firmware update
[*]the board seems to have internal pull ups,
[*]i have connected it directly to the sc and sd pins.
[/list]

 

Thank you for any help you might be able to offer.

 

Kind regards,

[NooM]

i think you have to write each command seperate, not all at once like this.

 

best would be using a i2c library like netmf-toolbox'es or the one from the link in my signature.

[Gino Geusens]

I got the display to light up, but no matter wat data i present, it looks like nothing but random leds on the display.

(always the same pattern no matter the data)

 

here is the code, i am still use the standard i2c library though

using System;using System.Net;using System.Net.Sockets;using System.Threading;using Microsoft.SPOT;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware;using SecretLabs.NETMF.Hardware.Netduino;namespace I2C_matrix_display_test{    public class Program    {        public static void Main()        {            var MatrixDisplay1 = new I2CDevice(new I2CDevice.Configuration(0x70,100));            byte Oscillator = 0x21; // turn on oscillator            byte SetDisplay = 0x81; //enable display, no blink            byte SetBrightness = 0xE4; //Full brightness            byte Address = 0x00; // first write adress            byte[] WriteDataArray = { 0x3C , 0x42 , 0xA5 , 0x81 , 0xA5 , 0x99 , 0x42 , 0x3C}; // data for display            byte[] EnableOscillator = { Oscillator };            byte[] EnableDisplay = { SetDisplay };            byte[] Brightness = { SetBrightness };            byte[] WriteToFirstAddress = { Address };            I2CDevice.I2CTransaction[] EnableOsc = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(EnableOscillator),            };            I2CDevice.I2CTransaction[] EnableDisp = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(EnableDisplay),            };            I2CDevice.I2CTransaction[] SetBright = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(Brightness),            };            I2CDevice.I2CTransaction[] SetFirstRegister = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(WriteToFirstAddress),            };            I2CDevice.I2CTransaction[] WriteDispData = new I2CDevice.I2CTransaction[]            {                I2CDevice.CreateWriteTransaction(WriteDataArray),            };            MatrixDisplay1.Execute(EnableOsc, 1000);            MatrixDisplay1.Execute(EnableDisp, 1000);            MatrixDisplay1.Execute(SetBright, 1000);            MatrixDisplay1.Execute(SetFirstRegister, 1000);            MatrixDisplay1.Execute(WriteDispData, 1000);        }    }}

What am i still doing wrong ?

 

 i guess i still need to convert this part to c#, but have no idea how to.

 

i am however presenting data so the leds should change...

//in the .h fileuint16_t displaybuffer[8]; //in the C++ file  for (uint8_t i=0; i<8; i++) {    Wire.write(displaybuffer[i] & 0xFF);    Wire.write(displaybuffer[i] >> 8);  }

[Gino Geusens]

im now using the NETMF toolbox, however the result is the same

 

Here is the code i am using now

using System;using System.Net;using System.Net.Sockets;using System.Threading;using Microsoft.SPOT;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware;using SecretLabs.NETMF.Hardware.Netduino;using Toolbox.NETMF.Hardware;namespace I2C_matrix_display_test{    public class Program    {        public static void Main()        {            MultiI2C MatrixTest = new MultiI2C(0x70, 100);            ushort[] WriteDataArray = new ushort[8] { 0x3C , 0x42 , 0xA5 , 0x81 , 0xA5 , 0x99 , 0x42 , 0x3C}; // data for display            MatrixTest.Write(new byte[] { 0x21 }); //turn on oscillator            MatrixTest.Write(new byte[] { 0x81 }); //0x81 = enable display with no blink            MatrixTest.Write(new byte[] { 0xE4 }); //set brightness            MatrixTest.Write(new byte[] { 0x00 }); //define first write register           for (byte i = 0; i < 8; i++)            {                MatrixTest.Write(WriteDataArray[i]);           };        }    }}

however i cannot write data, when i try to convert the c++ code it tells me

 

Error  1  The best overloaded method match for 'Toolbox.NETMF.Hardware.MultiI2C.Write(ushort[])' has some invalid arguments

Error  2  Argument 1: cannot convert from 'ushort' to 'ushort[]'

 

if i do it exactly like the c++ code

           for (byte i = 0; i < 8; i++)            {                MatrixTest.Write(WriteDataArray[i] & 0xFF);                MatrixTest.Write(WriteDataArray[i] >> 8);           };

i get the following errors

 

Error  1  The best overloaded method match for 'Toolbox.NETMF.Hardware.MultiI2C.Write(ushort[])' has some invalid arguments Error  2  Argument 1: cannot convert from 'int' to 'ushort[]' Error  3  The best overloaded method match for 'Toolbox.NETMF.Hardware.MultiI2C.Write(ushort[])' has some invalid arguments Error  4  Argument 1: cannot convert from 'int' to 'ushort[]'  

 

i can disable or enable the device, set brightness and make it blink, so it is accepting the commands i write to it.

however i cannot seem to write any data to it.

 

Any help would be greatly appriciated.

 

Kind regards,