Actually i am getting problem while trying to receive the incoming sms from gsm modem to micro controller
controller-lpc2148 Uart- UART0 //Cpu clock-60 Mhz (using PLL 12Mhz*5=60Mhz) VPB -15mhz //9600 baud rate ,8 bit data,1 stop bit,no parity Enabled interrupt-Rx0
Most definitely - as clearly described in quite a number of articles about the use of ring buffers. They are so popular just because they work well with interrupts or with multiple threads. So you haven't located the Keil LPC2100 UART sample code yet?