Dear Community, enclosed you will find an NMEA2000 to NMEA0183 message converter. Currently the converter itself only supports PGN 0x01F805, coding the actual GPS position. This PGN is then translated into an 0183 GPGLL message. I required the converter to interface an old VHF radio (supporting only NMEA0183) to the new NMEA2000 bus we installed into out boat. In the .rar archive you will additionally find the NMEA2000 protocol stack i wrote. It supports transmission and reception of NMEA2000 messages. As the NMEA2000 protocol is not as open as some people claim, the most difficult part at the moment is to interpert and decypher the representation of many CAN datafields for different messages. You can find a lot of information in the appendix of all Maretron datasheets (www.maretron.com). Additionally I am using the transmission part of the NMEA2000 stack with an old speedometer that I converted to NMEA2000. It works pretty very well. Unfortunately the sources are not sufficiently well documented to be published yet. I will be improving the stack in the near future and add more comments on how it works. Liebe Grüße Phili
Gast
#1433324
Hi Philipp, are there any news on your converter ? New developments, extensions .... Thanks Frank
Gast
#1450209
Philip I am very interested in this project, can you keep me informed of your progress with your stack. I also have a lot of information on J1939 that NMEA2000 is based on that maybe of help to you. Including PNG data formats. also, you are using part of a "Multi-Tasking Core for ATMEL microcontrollers", where did this come from?? thanks tom lafleur lafleur @ lafleur.us <--- please use this address
Gast
#1925537
I realize that this posting is over a year old but have you done any further work on the N2K standard that you would be willing to release? Thanks in Advance if you read this. Eric
Hallo
Ich komme bei den Message id nicht weiter kann mir da jemand helfen.
habe den obigen Code ausprobiert.
uint8_t mcp2515_read_id(uint32_t *id)
{
uint8_t first;
uint8_t tmp;
first = spi_putc(0xff);
tmp = spi_putc(0xff);
if (tmp & (1 << IDE)) {
spi_start(0xff);
*((uint16_t *) id + 1) = (uint16_t) first << 5;
*((uint8_t *) id + 1) = spi_wait();
spi_start(0xff);
*((uint8_t *) id + 2) |= (tmp >> 3) & 0x1C;
*((uint8_t *) id + 2) |= tmp & 0x03;
*((uint8_t *) id) = spi_wait();
return 1;
}
else {
car1=2;
spi_start(0xff);
*((uint8_t *) id + 3) = 0;
*((uint8_t *) id + 2) = 0;
*((uint16_t *) id) = (uint16_t) first << 3;
spi_wait();
spi_start(0xff);
*((uint8_t *) id) |= tmp >> 5;
spi_wait();
return 0;
}
}
void mcp2515_write_id(const uint32_t *id)
{
uint8_t tmp;
spi_start(*((uint16_t *) id + 1) >> 5);
// naechsten Werte berechnen
tmp = (*((uint8_t *) id + 2) << 3) & 0xe0;
tmp |= (1 << IDE);
tmp |= (*((uint8_t *) id + 2)) & 0x03;
// warten bis der vorherige Werte geschrieben wurde
spi_wait();
// restliche Werte schreiben
spi_putc(tmp);
spi_putc(*((uint8_t *) id + 1));
spi_putc(*((uint8_t *) id));
}
priority=6
PGN=0x1F010; (Date/TIME)
Source_address=10
message.id = ((uint32_t)(message_container->priority & 0x07) << 26) |
(((uint32_t)message_container->PGN & 0x01FFFF) << 8) | source_address;
Ergebniss messageid=0x1003 das stimmt doch nicht???
die Daten kommen richtig im Datafeld.
Nur die ID nicht.
Wie wird die berechnet???
Danke
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