add examples

RTL00_SDKV35a/example_sources/uart_irq/readme.txt

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+Example Description
+
+This example describes how to use UART to communicate with PC.
+
+Required Components:
+    USBtoTTL adapter
+
+Connect to PC
+ - Connect Ground: connect to GND pin via USBtoTTL adapter
+ - Use UART1
+	GPIOA_6 as UART1_RX connect to TX of USBtoTTL adapter
+	GPIOA_7 as UART1_TX connect to RX of USBtoTTL adapter
+
+Open Super terminal or teraterm and 
+set baud rate to 38400, 1 stopbit, no parity, no flow contorl.
+
+This example shows:
+1. The RX data ready interrupt service routine is used to receive characters from the PC, and then loopback them to the PC.
+2. The TX done interrupt service routine will send a prompt string "8195a$" to the PC.

RTL00_SDKV35a/example_sources/uart_irq/src/main.c

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+/*
+ *  Routines to access hardware
+ *
+ *  Copyright (c) 2013 Realtek Semiconductor Corp.
+ *
+ *  This module is a confidential and proprietary property of RealTek and
+ *  possession or use of this module requires written permission of RealTek.
+ */
+
+#include "device.h"
+#include "serial_api.h"
+#include "main.h"
+
+#define UART_TX    PA_7
+#define UART_RX    PA_6
+
+volatile char rc=0;
+
+void uart_send_string(serial_t *sobj, char *pstr)
+{
+    unsigned int i=0;
+
+    while (*(pstr+i) != 0) {
+        serial_putc(sobj, *(pstr+i));
+        i++;
+    }
+}
+
+void uart_irq(uint32_t id, SerialIrq event)
+{
+    serial_t    *sobj = (void*)id;
+
+    if(event == RxIrq) {
+        rc = serial_getc(sobj);
+        serial_putc(sobj, rc);
+    }
+
+    if(event == TxIrq && rc!=0){
+        uart_send_string(sobj, "\r\n8195a$");
+        rc = 0;
+    }
+}
+
+void main(void)
+{
+    // sample text
+    serial_t    sobj;
+
+    // mbed uart test
+    serial_init(&sobj,UART_TX,UART_RX);
+    serial_baud(&sobj,38400);
+    serial_format(&sobj, 8, ParityNone, 1);
+
+    uart_send_string(&sobj, "UART IRQ API Demo...\r\n");
+    uart_send_string(&sobj, "Hello World!!\n");
+    uart_send_string(&sobj, "\r\n8195a$");
+    serial_irq_handler(&sobj, uart_irq, (uint32_t)&sobj);
+    serial_irq_set(&sobj, RxIrq, 1);
+    serial_irq_set(&sobj, TxIrq, 1);
+
+    while(1);
+
+}
+
+