HAMZA

hi every one i have some questions about this firmware = how can i deploy my ND+ from the RS232 port (because i want to make it like an usb device). = the watchdog don't work !!!?

Look at this thread: http://forums.netdui...-netduino-plus/

The watchdog is there on the hardware, but the stock firmware just turns off the watchdog, and has stubs for all the functionality.

I got it working on ND+ firmware 4.1.0.6, my next goal is to make it working with CW2's 4.1.1b1 firmware with 1-wire support.

hi ToniA
thank your for help
i have an DS1820 that i want to try with netduino+, if 1-wire work also, i will be very happy

Unfortunately, I don't have this particular device to check it, but I think the correct method to write a byte is to create just one write transaction of two byte buffer (address, data):

// Write transaction (up to 8 or 16 bytes, depending on the page size)
var xWrite = I2CDevice.CreateWriteTransaction(new [] { RegisterNum[0], Value[0] });
myi2c.Execute(new I2CDevice.I2CTransaction[] { xWrite }, 100);

// Write cycle time is 10 ms
Thread.Sleep(10000);

// Random read transaction requires repeated start condition, but CreateWriteTransaction(...)
// followed by CreateReadTransaction(...) generates two separate transactions,
// you have to use CreateReadTransaction from http://forums.netduino.com/index.php?showtopic=944
var data = new byte[8];
uint startAddressToReadFrom = 0;
var xRead = CreateReadTransaction(data, startAddressToReadFrom, 1);
myi2c.Execute(new I2CDevice.I2CTransaction[] { xRead }, 100);

Note: The code is written from head, may not even compile.

it work now, thanks
you too NooM, thanks for your help

You are using invalid slave address, 0xA2 includes the R/W bit which is not part of the slave address in .NET MF (max. value is 0x7F, hence the exception), try passing 0x51 instead (assuming A2 = 0, A1 = 0, A0 = 1).

i haven't thinking about this trick, thank you .
now it work, i can read data from my eeprom, but i can't write on it anything.

address: 0 data: 72
address: 1 data: 101
address: 2 data: 108
address: 3 data: 108
address: 4 data: 111
.......

try lock(youri2cdevice) and set the timeout lower.

also, do you have pullup resistors on your i2c lines? 4.7kohms are fine.
also try 100khz instead of 400 when talking to your device. you can change that when you found out what was wrong.

i have pullup my eeprom with 1k resistors.
i have locked my "myi2c" object but its still not working.

when i try to read the value of the selected register ,this message appears in output windows

Une exception de première chance de type 'System.ArgumentException' s'est produite dans Microsoft.SPOT.Hardware.dll.
Une exception non gérée du type 'System.ArgumentException' s'est produite dans Microsoft.SPOT.Hardware.dll

with some traduction, it will be somthig like this

A first chance exception of type 'System.ArgumentException' occurred in Microsoft.SPOT.Hardware.dll.
An unhandled exception of type 'System.ArgumentException' occurred in Microsoft.SPOT.Hardware.dll