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gidimiz
Joined: 03 Feb 2005
Posts: 428
Helped: 77
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 21 Dec 2005 16:26 microchip gprs |
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Hi,
Here is an idea. Take the free TCP/IP stack from microchip. But at one end the new ENC28J60 Ethernet controller. Connect the PIC UART to a GSM modem and you will have an instant wireless internet conenction.
OK, so where is the problem. The problem is in the interface to the GSM modem, and the protocol that the GSM is using when connecting using the GPRS.
Any own has any idea what layer of the TCP stack is transfer.
How to convert the Ethernet side into the UART protocol.
The PIC18 from Microchip will do the job just fine, but how is the questions 
Any idea?
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pisoiu
Joined: 31 Dec 2002
Posts: 729
Helped: 24
Location: Romania
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21 Dec 2005 17:10 modem microchip |
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Almost all GPRS modems have TCP/IP stack built in, so your job is quite easy. You will have to transfer raw data, as they are offered by the TCP/IP stack from Microchip directly to the modem, and do the same for the other direction. Of course, you will have to manage the ethernet socket, and also the GPRS connection/GSM modem (configuration commands, dial commands, supervise the status of the modem and of the connection), and also you will have to implement some kind of flow control and data buffering, since the speeds used in these connections are at a big difference.
/pisoiu
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21 Dec 2005 17:10 Ads |
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gidimiz
Joined: 03 Feb 2005
Posts: 428
Helped: 77
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22 Dec 2005 8:30 gsm + microchip |
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Hi Pisoiu,
You are correct. I know about this methode as i have already built few project with GPRS and i also write code to the internal software for the GR47.
But i want to use the modem witout the internal stack, there are few reasons for that. Either way, I want to iplament the stack by myself so i will have more control.
Any idea?
Thanks.
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