Interfacing DSK6713 with an GSM modem

The C6713 has a variety of external interface options:

• 32-bit External Memory Interface (Asynchronous, Synchronous, SBSRAM)
• 16-bit Host Port Interface (driven by host, not by DSP)
• Multi-Channel Buffered Serial Port (x2)
• Multi-Channel Audio Serial Port (x2)
• Inter-Integrated Circuit serial port (x2)

Each has its own features and capabilities. The DSK6713 brings out some of these features conveniently to connectors for your use with interfacing to an external device such as the GSM modem. Depending on your device and data rate requirements, you might be able to make a simple connection between the DSK and the modem. Or you may need to add a daughtercard that adapts the specific signalling requirements of your modem to the specific timing and signals of the DSK.

Thanks for your answer, RandyP. Coud you tell me some example of GSM modem to simple connection between DSK and modem? Where I can find about external interface connections, specific requirements, ...?

Regards.

This is too vague to be able to give you a reliable answer. You will need to refine your question to what you really need help with and search the forum and www.ti.com for anyone who may have already addressed a similar product.

The documentation on the CD that accompanied your DSK6713 will have information on the connectors and signals that are available. The technical specifications for your GSM modem will have that information for that product.

Hi RandyP. Thanks for your mail.

I assume that GSM modem conect with DSK through HPI expansion connector and I need use DSK6713HPI Daughtercard mounted on DSK, because the most of modems connect by RS232 o parallel port. Is this correct? Or there are other forms to conect them. The technical reference show pin definition only.

If most of the modems connect by RS232 or parallel port, then HPI is not the right choice. The DSP's HPI is a slave port on the DSP so it is for a host processor to communicate with the DSP.

Why have you chosen the DSK6713?

Which direction will data be flowing? Only out through the GSM modem or also in?

Will you be writing or buying drivers to handle the interaction with the GSM modem, such as what would be done on a PC with drivers from a CD from the wireless provider?

Which GSM modem have you selected, or which types will you choose from?

Do you have access to engineering design consultants/contractors who can implement your product for you?

Hi RandyP.

I´m working to final proyect and I process information received with a microphone input, storage and then I want to send it through GSM modem.

Initially, the direction of data flow was only out. I only want to know if it is possible with DSK6713 and what elements are necessary??

Thanks.

My first posting listed the types of interfaces available to you on the C6713. The DSK6713 technical reference tells you which interfaces are brought out to the expansion connectors.

If I understand you correctly, you will need to search through all of the available GSM modems to find one that can be connected to one of these interfaces and for which you can get information on how to write drivers to make the GSM modem make a connection and send data. You can design and build an interface adapter to work with anything, but that is an engineering effort outside of the DSP/DSK6713 design effort.

Please excuse my limited English. I'm trying to improve.

I saw your list of interfaces available on C6713. I have been looking for examples or any document that describe this but I don´t find nothing. It´s as if nobody wasn´t tried to do it. For this reason I´m asking you if it is posible. There are many types of modems and the great majority of this connect through serial port and I think there are some interface made in to adapter DSK interface and modem. Thanks you very much.

I feel very confident that you can find a GSM modem that can be driven by your DSK6713, but I cannot tell you absolutely without going through the engineering process that must be done to complete this project.

At the very least, the EMIF can send a very large amount of data out the parallel port to the expansion connectors, so you could add on an FPGA daughtercard and program that FPGA to be compatible with a GSM modem. Or there may be a simpler interface using one of the serial ports, but it might still need at least a simple CPLD to make it work with the GSM modem.

The software to drive the GSM modem will be independent of the hardware interface you use. The availability of driver source and documentation will depend on the manufacturer of the GSM modem.

There is a wealth of documentation on the C6713 peripherals: User Guides for the peripherals and Application Notes to show examples of how they have been used for specific tasks. The User Guides will explain how the peripheral works from the registers to the pins. The Application Notes will explain examples that may be similar to what you want to do once you have decided which method will work for you.

To find these documents, you can do the following:

1. Go to www.ti.com
2. Under Design Support, pull down the box that says Select Product Group and pick DSP.
3. Then pull down the Select Document Type box, select User Guides and click GO.
4. Under Technical Documents, pull down the Processor Platforms box, then under C6000 Floating-point DSPs select TMS320C67x DSPs and click GO.
5. Find the peripherals you want to learn more about from this list.
6. To look at the Application Notes, go back to the top of this Technical Documents page and change the second drop-down box to Application Notes, then click GO.