But I Do made it works with 3.3V power supply ,and it doesn't work with 5V(a exception happened during I2C operation).....

The silk mark on the chip is DS1307ZN,it's really weird.

Here it goes:

http://lifetyper.com/post/52266110944

I2C is an open drain bus,the votage on the bus is decided by the pull up resistor,both pin for SCL/SDA on ND2+ is 5V tolerant.

You can connect it to any i2c device with pull up voltage equal or lower than 5V.

Try another uart tool on your pc...

I've already make an I2C 1602 LCD working with my netduino plus2:

http://lifetyper.com/post/52202466954

1?Re-flash your netduino's firmware,make sure you get the correct version this time;

http://wiki.netduino...ep-by-step.ashx

2?Re-config you netduino's network configuration:

http://wiki.netduino...duino-Plus.ashx

BTW:A exception on socket doesn't equals a  device issue,there might be something wrong with your internet connection,some times using a static IP for netduino will be more reliable than using DHCP.

OK,confirmed that add 2 pull up resistors will make I2C To IO expander work.I've draw a schematic for that board for your reference.  lcm1602.pdf   93.6KB   125 downloads

I've got an I2C LCD recently,and it's not working either.The label on the bottom of the PCB is"YwRobot LCM1602 IIC V1".

But the reason is found::There is no pull up resistor For I2C Bus on the LCD module.

So,might there be some different on I2C design between NP1+ and NP2+?Which makes NP1+ don't need external pull up resistor.

I've try to draw the schematic for that I2C To IO board and add pull up resistor later by myself.Wait for my update.

Same problem with me,and still no solution.

normally,a coin cell is enough to powe the rtc for several years.

Thanks for your reply, but have already jumpered the new SCL/SDA pins to A4/A5, so it should be working.

If possible,I would suggest you to measure the waveform of the I2C bus to see if anything abnormal.

Thats what I thought to. Thank you for the link to ODeV.

I've installed the package and it manages to compile the template project, generating a .elf file. Does this file contain the whole pre-compiled project? 

Yes,you can use the elf file with GDB for debug.

Or you can use below command to generate .hex file for burning(using st-link utitily or something similar)

arm-none-eabi-objcopy.exe -O ihex Yourfilename.elf Yourfilename.hex

I've tested AT24C16(I2C) and W25X16(SPI) with NP2+,all works fine.

Infact $150 is OK for me.

But to get more people to support a mass production,I think price  around $100 may be more acceptable.

obviously you made some mistake while setting up the eclipse.

there should not be any error about "Make" command,as you don't need to write makefile for such a building.

I think all you need can be found here:http://www.stf12.org...opers/ODeV.html

Good job!

I would like to buy such a board when available.

If the price can be lower would be better ,as $200 is already enough for a i.MX6 dev board(sabre lite),

So,you've already done the NETMF porting job for your board?

connect the netduino to usb port,then look into your computer's device manager,did the driver for Netduino installed correct?

well,for NP2+,you should connect I2C bus to the SCL/SDA pin?not A4/A5.

A4/A5 on NP2+ is PC4/PC5 on STM32F405,if you look into the datasheet,neither of them got I2C function,you can just  use them as ADC input pin.

Indeed,everytime I read the VHDL code,I feels like I'm reading a netlist of a PCB....

Hi Mike,are you sure that data lost happened during the writing process?As the SPI bus speed is much more faster than uart,2KB/s should not be a problem.

I've met file lost issue too,but that happened when I power off the device or remove the card,and I'm still working on that.

BTW,here below is my firmware information:

SolutionReleaseInfo.solutionVendorInfo: Netduino Plus 2 (v4.2.2.2) by Secret Labs LLC SoftwareVersion.BuildDate:   Jan 26 2013 SoftwareVersion.CompilerVersion:   410894

Hello everyone.

I tried to create&write&read files with micro sd card on NP2+,using a 2gb sandisk micro sd card with FAT format.

From the debug output information,I can see that file did created and exist.But when I remove the card from NP2+ and try to read the content from my PC,I found nothing,sometimes file exist but corrupted.

Even not removing the card, just re-deploy the same code again(as the chip will reboot),the file created last time  disappered(I detect whether file exist before I create it).

After adding a 1000ms sleep,the situation improves just a little bit,which means if I write it for several times, I may get one time success saved.

So,is there anything wrong with my code or any tricks for NP2+ micso sd file write?

================================

using System; using System.Net; using System.Net.Sockets; using System.Threading; using System.IO; using Microsoft.SPOT; using Microsoft.SPOT.Hardware; using SecretLabs.NETMF.Hardware; using SecretLabs.NETMF.Hardware.Netduino; using SecretLabs.NETMF.IO; namespace SDFileLearn {   public class Program   {   public static void Main()   {   DirectoryInfo rootDirectory = new DirectoryInfo(@"SD");   if(!Directory.Exists(@"SDNewDir"))   { DirectoryInfo xDir= Directory.CreateDirectory(@"SDNewDir");   }   if (File.Exists(@"SDTestNew.txt"))   {   Debug.Print("File Exist!");   }   else   {   Debug.Print("Not Exist,Create New!");   }   StreamWriter xWrite = new StreamWriter(System.IO.File.Open(@"SDTestNew.txt", FileMode.Append));   xWrite.Write("Hello New Worldrn");   xWrite.Flush();   xWrite.Close();   Thread.Sleep(1000);   if (File.Exists(@"SDTestNew.txt"))   {   StreamReader xRead = new StreamReader(@"SDTestNew.txt");   Debug.Print(xRead.ReadLine());   xRead.Close();   Thread.Sleep(1000);   }   RecurseFolders(rootDirectory);   if (File.Exists(@"SDTestNew.txt"))   {   Debug.Print("File Exist!");   }   else   {   Debug.Print("Not Exist!");   }   Thread.Sleep(1000);   }   private static void RecurseFolders(DirectoryInfo directory)   {   if (directory.Exists)   {   Debug.Print(directory.FullName);   foreach (FileInfo file in directory.GetFiles())   {   Debug.Print(file.FullName);   }   foreach (DirectoryInfo subDirectory in directory.GetDirectories())   {   RecurseFolders(subDirectory);   }   }   }   } }  

yes that happens to me too.

 

you have to call call unmount before you power it down.

 

when you write more data you will see it, and also see how much is lost (like write 100 lines, some will be lost)

I remembered that Chris said NP2 would auto mount&unmount SD card,this semms not neccessary process for NP2.