ikorsa

Thanks Chris, 1. I'll try this way and let you know. 2. I'm still wondering why it's happend. May be somebody else has a 10 HZ GPS and Netduino to try ? 3. Parsing the NMEA is not big deal, but I do not need it in Netduino( may be I need to setup RTC ), I need just recieve it and put to the flash and SD. Detail parsing I 'll do on PC. Anyway to use 20 HZ GPS I'll switch to binary mode, but for debuging it easy to use NMEA... Igor

Hi Chris, I probably solved the problen to put Thread.Sleep(90) in EventHandle procedure. But problem is 1. I read int bytesToRead = serialPort.BytesToRead; in my post it will NOT 72 for hole RMC line It look like - bytesToRead = 25 and I got this $GPRMC,223841.900,V,0000. bytesToRead = 11 and I got 0000,N,0000 bytesToRead = 10 and 0.0000,E,0 .... Some time bytesToRead = 72 and I got hole correct line $GPRMC...... When I'm using the Hyperterminal - I got correctly all lines I put Thread.Sleep(90), it help - it reduce "small" lines , but it's happend anyway. My plan to use the 20 HZ GPS (I'm waiting for hardware), but I'm not sure... I read some your post that .NET is not for real time programming, but this platform it really reduce a lot of time! My project is simple datalogger : 20 HZ GPS UART (230400) , 2 channel temperature SPI reading ( 2 cyllinders), Timer for RPM and 3 axis accelerometer analog or I2C ( I need to try both) micro-SD SPI and AT45DB361D SPI for Flash and Xbee (UART) for communication. I started on ARM7 (LPC2478) with Keil C... too much head ache for me it is not programming it look more like "know how". I switch to Arduino - more simple , but most Library that exist - very pure written - I bought Netduino now, and very happy with other my project with GPRS module and send and recieve SMS with .Net it so simple and "nicely" to program it! Great! I hope tha I can able to finish it before may with Netduino. Thanks Igor

sorry forgot to mention firmware 4.1.1 ALPHA7 This is the output data GPS update rate 10Hz (100ms) $GPRMC,223840.400,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*7C $GPRMC,223840.500,V,0000.0000, N,00000.000 0,E,000.0, 000.0,210211 ,,,N*7D $GPRMC,223840.600,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*7E $GPRMC,223840.700,V,0000 .0000,N,000 00.0000,E, 000.0,000.0 ,210211,,,N*7 F $GPRMC,223840.800,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*70 $GPRMC,223840.900,V,0000.0000,N ,00000.0000 ,E,000.0,0 00.0,210211, ,,N*71 $GPRMC,223841.000,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*79 $GPRMC,223841.100,V,0000 .0000,N,000 00.0000,E, 000.0,000.0, 210211,,,N*78 $GPRMC,223841.200,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*7B $GPRMC,223841.300,V,0000.0000,N ,00000.0000 ,E,000.0,00 0.0,210211, ,,N*7A $GPRMC,223841.400,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*7D $GPRMC,223841.500,V,0000 .0000,N,00 000.0000,E, 000.0,000.0, 210211,,,N*7C $GPRMC,223841.600,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*7F $GPRMC,223841.700,V,0000.0000 ,N,00000.000 0,E,000.0, 000.0,210211 ,,,N*7E $GPRMC,223841.800,V,0000.0000,N,00000.0000,E,000.0,000.0,210211,,,N*71 $GPRMC,223841.900,V,0000. 0000,N,0000 0.0000,E,0 00.0,000.0,2 10211,,,N*70

I use the same code to read from Serial port, but connection is not reliable. I use 10HZ update rate GPS with 115200 baud rate. serialPort.bytesToRead show less then 72 (but look like 24+8+.. =72) , the $GPRMC length = 72. some time 2-4 sentence is ok. It mix together normal $GPRMC sentence and sentence break on a parts. I have know idea why, when I connect GPS + serial to USB -> computer all ok!even on 230400 baudrate GPS send only $GPRMC each 100 ms.(nothing else) The code is the same as above ... Not enough speed for processor ? But in my project I have to hookup 20 HZ GPS ?! Thanks Igor