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Hi All,
I managed to get a few programs running in the SIM900 using the Embedded AT (EAT) functionality and the API provided. One inconvenience in using EAT is the unavailability of new firmware versions which support EAT functionality. Currently the only firmware version I have that supports...
Hi Chris,
Maybe I can help you with this. The error that you get is because of not resetting the GSM module to sync up with the flash downloader to initiate the download process. Do you have a sim900-rest button on your board? (tied to the RESET pin of the sim900) if so you can use the following...
UPdate: It was the auto-bauding (phew) Figured it out after reading the AT command guide. Once the sim900 powers up, you have to wait a while (for about 5 sec) and then in hyperterminal type "AT". I was typing "at" all this time and that's why the sim900 did not properly sync up with the PC...
HI Chipseller,
Thanks for the answer. I was using 115200 to communicate with the sim900, before, during and after the re-flashing. (I don't see a 15200 option in the flash loader ??) I also tried re-flashing at 9600 (takes a while) but even that resulted in the same behavior. One thing that I've...
Hi again all,
If any of you guys still around, hoping you could help me!!!
I got a new sim900 module and tried to flash it according to the instructions given by chipseller. (before flashing I set the baud rate to 115200) Out of the box, my firmware revision was 1137B08SIM900M64_ST and was...
Hi ichan,
I've also just managed to build the test project of the EmbeddedAT using both the command prompt and IDE (after a lot of tinkering with various files and etc). It is exiting to know others are working on a similar project, because so far I've found so very little detail on EAT. Maybe...
Hi chipseller,
Many thanks for your response. Will you be able to let me know where you downloaded the SIM900DevIDE from ?
Also have a look at the following site. It's in Russian (I think) but all documents are in English. It contains some documentation on sim gsm modules (especially SIM900)...
Hi all,
I've been using Sim300 for some time and I've done a lot of work with it. Recently, when I wanted to order another batch, I was asked to use SIM900 instead of sim300. I've been doing a bit of reading on SIM 900 and realized that it features whats known as Embeded AT, which enables a user...
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