FPGA, SoC, And CPLD Boards And Kits
FPGA Evaluation and Development Kits
Intel Support hours are Monday-Fridays, 8am-5pm PST, except Holidays. Thanks to our community members who provide support during our down time or before we get to your questions. We appreciate you!

Need Forum Guidance? Click here
Search our FPGA Knowledge Articles here.

Communicate sim900 with DE2

Honored Contributor II

Hi everybody, 


I am doing a projects that use GPS module sim900 to communicate with FPGA DE2. 

The module sim900 has 1 UART interface to command out, simply it has only 3 lines RXD and TXD and ground. 


I designed a system-on chip based ARM and some interfaces (of course it has UART as well), and then loading design into DE2 kit. 

I connected 3 lines of UART interface from sim900 with 3 GPIO pins (UART in my design used GPIO from board), but not sure why I cannot get any signal back after turning on the sim900 circuit. 


I also test separately sim900 + PC and my design + PC and they are working normaly. 


Anybody has experience on this case. Many thanks... 


0 Kudos
1 Reply
Honored Contributor II

Have you tested the RS232 independent of the GPS unit?