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Hi I want to connect GSM modem to the STRE912 board I configured the uart which can recieve interrupt from modem I am using uart 0 for connecting the modem and uart 2 to debug the application but the modem is giveing timeout errorthe processor is str912Fw44 I used both ways ( by RS232 as well as TTL level to connect to the modem) but it gives timeout error
previously I used uart0 to connect my modem then I used uart 2 to see the printf messages actually I need some effective way how to see wat is transmitting to modem and what modem transmitting to the controller?
Is it not that a serial port can be full-duplex? you have a separate RX and a separate TX line (but they are not compelled). so, you can get along with one UART. And, isn't looking at the serial data actually "debugging the modem"?
Another thing that can be done - but most often when you do not have access to the source code or do not want to change anything in a system - is to connect a sniffer.
Take tx and ground and wire to a separate RS232 connector.
Take rx and ground and wire to a separate RS232 connector.
Now you can use a PC with two serial ports - one serial port will monitor data sent in one direction, and one serial port will monitor data sent in the other direction.
Buy or locate a good log program that will time-stamp all data, and that can be taught to look at framing when time-stamping and presenting the transmitted data.