RS232 port receiving only two characters?

void ism_rs232_handler(void)
{	
	 uint32_t readBuffer;
	 uint32_t readStatus;
	
	puts("\r\n Inside RS232 Handler \r\n");
	
		readStatus = usart_get_status(RS232_USART);		
		if (readStatus & US_CSR_RXRDY)
		{					
			uint8_t ret = usart_read1(RS232_USART, (uint8_t *)&readBuffer);
			{
				gv_rs232RespData[gv_rs232Count++] = readBuffer;
			}		
			printf("\r\n String = %s \r\n",gv_rs232RespData);
			
			// Once the expected bytes are received raise the flag
				if(gv_rs232Count > 3)
				{
					gv_rs232RcvFlag = true;
				}	

		}		



}
uint32_t usart_read1(Usart *p_usart, uint8_t *puc_data)
{
	/* Check if the receiver is ready */
	if ((p_usart->US_CSR & US_CSR_RXRDY) == 0)
	return 1;

	/* Read character */
	*puc_data = (uint8_t) p_usart->US_RHR & US_RHR_RXCHR_Msk;

	return 0;
}