Hi Chris, I currently have no logic analyzer. My board is a "Netduino 2". Through the change of the pull-ups on 1.2 k, my problem currently is solved with the I2C . The board is working correctly. The bus line I first kept short. Am now going to test the OneWire DS 2482-100 with 1 DS18S20 on the I2C Bus. But I find no code example. The onewire functions are new in the 4.2 framework? Where can I get help for Microsoft.SPOT.Hardware.OneWire class?

My new test with the code: always count is 0: public static void Main(){ var device = new I2CDevice(new I2CDevice.Configuration(0x50, 100)); I2CDevice.I2CTransaction[] actionsWrite; uint adresse = 0x01; byte[] data = new byte[] { 0x42 }; byte[] buffer = new byte[3]; buffer[0] = (byte)(adresse >> 8); buffer[1] = (byte)adresse; data.CopyTo(buffer, 2); uint i = 0; do { actionsWrite = new I2CDevice.I2CTransaction[] { I2CDevice.CreateWriteTransaction(buffer) }; int count1 = device.Execute(actionsWrite, 1000); Thread.Sleep(1000); i++; Debug.Print(i.ToString()+" Count: " + count1.ToString()); } while (true); } I think the board is defective!

The processing of the 3 bytes in 3 transactions was only to test. The first transaction returns as Return Code: 0 bytes transfers. In the original code, all 3 bytes processed in one transaction but only with the Return Code: 0 Bytes The SCL line has at times no pulse on the instrument but always 4.85V even after the end of the transaction. Next I change my test back to one transaktion.

Hi CW2, The EEPROM is a Microchip 24LC64 (A0,A1,A2,WP = 0) Here is my Testcode: public static void Main() { I2CDevice.Configuration _slaveConfig = new I2CDevice.Configuration(0x50, 100); uint adresse = 0x01; byte[] buffer = new byte[2]; buffer[0] = (byte)(adresse >> 8); buffer[1] = (byte)adresse; int count = I2CBus.GetInstance().Write(_slaveConfig, buffer, 500); byte[] data = new byte[] { 0x42 }; count = I2CBus.GetInstance().Write(_slaveConfig, data, 500); Debug.Print("Count: " + count.ToString()); } The I2C connection to the display is the same. Another board with an ATmega32 working on the bus without problems

Hi, I again problems with the I2C bus in connection with the display and the serial EEPROM. When code in I2CBus "transferred = _slaveDevice.Execute (writeXAction, transactionTimeout)" Transferred is always 0 and there is also no exception. The multimeter can be seen in SCL and SDL has a frequency of 0.34 kHz and 4.85 V, and this is always constant. The motherboard is defective?

I found the cause: the display is set to power down mode. The power consumption is lowered to a minimum. The display remains visible. By addressing the I2C address of the display should be awakened. Does it not! I suspect the time between the writing of the address and the data is too low. Without power-down mode, the connection is normal. Thanks you for the help!

here is a link to this Display:
http://www.lcd-modul.../edip160-7e.pdf

The connection to the I2C EEPROM works.
The code to the LCD has been modified with the length byte and checksum but that does not:

I2CDevice.Configuration config = new I2CDevice.Configuration(0x6F, 100); //0xDE
I2CDevice device = new I2CDevice(config);
I2CDevice.I2CTransaction[] array = new I2CDevice.I2CTransaction[2];

Encoding code = Encoding.UTF8;
byte[] text = code.GetBytes("#DL" + "n"); // clear the display
byte[] buffer = new byte[text.Length+3];
buffer[0] = (byte)(0x11); // DC1
buffer[1] = Byte.Parse(text.Length.ToString());
int bcc = buffer[0] + buffer[1];
byte i = 0;
while (i < text.Length) { bcc = bcc + (byte)text[i]; i++; }
text.CopyTo(buffer, 2);
buffer[text.Length + 2] = (byte)bcc; // checksum
array[0] = I2CDevice.CreateWriteTransaction(buffer);
byte[] ack = new byte[1];
array[1] = I2CDevice.CreateReadTransaction(ack); // 0x06 should be returned
int count = device.Execute(array, 100);
Debug.Print("count: " + count.ToString());

Thank you "CW2" for the helpful info, after the change of address to 0x6F is not an "exception". But the connection still does not work. The following code: " I2CDevice.Configuration config = new I2CDevice.Configuration (0x6F, 100); I2CDevice device = new I2CDevice (config); I2CDevice.I2CTransaction [] array = new I2CDevice.I2CTransaction [1]; Encoding code = Encoding.UTF8; byte [] buffer = code.GetBytes write ("#DL" + "n"); array [0] = I2CDevice.CreateWriteTransaction (write buffer); COUNT_1 device.Execute int = (array, 1000); Debug.Print ("count1" count_1.ToString + ()); array [0] = I2CDevice.CreateWriteTransaction (write buffer); int = COUNT_2 device.Execute (array, 1000); Debug.Print ("count2" count_2.ToString + ()); " The return value of COUNT_1 = 0 but of COUNT_2 = 4 (sometimes even 0). The display should be deleted with this command, but no response .. The connection via I2C bus by a different controller (not Netduino) to the display is working properly. The pullup resistors to VCC or 4.7 k What can I do?

Hallo,

I have some days are a "Netduino 2". One of my first applications should connect to the I2C bus of an LCD display. I have tried a variety of source code, but all the same error.  Even if no connection to the I2C hardware is present, is the same error. What am I doing wrong? Here's my simple code: I2CDevice.Configuration config = new I2CDevice.Configuration (0xDE, 1); I2CDevice device = new I2CDevice (config); I2CDevice.I2CTransaction [] array = new I2CDevice.I2CTransaction [1]; byte [] buffer = new byte [1]; buffer [0] = 0x0C; array [0] = I2CDevice.CreateWriteTransaction (buffer); device.Execute (array, 1000); 

>> here comes the error:

'System.ArgumentException' occurred in Microsoft.SPOT.Hardware.dll. " "device.m_xAction": The value of the "m_xAction" can not be retrieved because no information about the containing class is available.