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Problem with USART on my AVR micro-controller

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surjya

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Hi Geeks,

I am working on a project. Following are my setup.

1. Micro-controller - AT32UC3A0512
2. Development board - EVK1105 from ATMEL
3. Embedded OS - FreeRTOS
4. Modules involved USART,Display,keypad,ADC

Following is my problem.
-> My development has 3 usarts. I am using USART0. To communicate through USART i am using RS232 standard with baudrate 115200, 1 stopbit, no parity, 8 databits. I am using ISR to send/receive data through USART
-> I have connected a phone modem to the boards USART0. This modem initializes and responds commands when I connect it to my PC though serial port though TeraTerm, putty like console programs.
-> The board also can send/receive data through USART0 when connected to PC.
-> But when I connect the board's USART0 to my phone modem, I can't receive the data in proper format or I get some junk characters. My FreeRTOS also crashes after this.

Can anybody suggest me what may be the problem and how I can debug this problem?
 

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