add examples

RTL00_SDKV35a/example_sources/pwm-buzzer/readme.txt

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+Example Description
+
+This example describes how to use pwm buzzer on extend board
+
+Requirement Components:
+    extend board, buzzer
+
+Connect extend board to 2v0 dap board, and connect buzzer on the extend board's buzzer pin, then the buzzer would play sound from Do to higher Do.
+
+ 

RTL00_SDKV35a/example_sources/pwm-buzzer/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 "pwmout_api.h"   // mbed
+#include "main.h"
+#include "os_support.h"
+
+#define PWM_1       PC_0 
+#define PWM_2       PC_1 
+#define PWM_3       PC_2 
+#define PWM_4       PC_3 
+
+
+
+pwmout_t pwm_led[4];
+PinName  pwm_led_pin[4] =  {PWM_1, PWM_2, PWM_3, PWM_4};
+float period[8] = {1.0/523, 1.0/587, 1.0/659, 1.0/698, 1.0/784, 1.0/880, 1.0/988, 1.0/1047};
+
+extern void RtlMsleepOS(u32 ms);
+
+void pwm_delay(void)
+{
+	for(int i=0;i<1000000;i++)
+		asm(" nop");
+}
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+//int main_app(IN u16 argc, IN u8 *argv[])
+void main(void)
+{
+    int i;
+    
+
+        pwmout_init(&pwm_led[3], pwm_led_pin[3]);
+
+
+
+    while (1) {
+ 
+      for(i=0; i<8; i++){
+            pwmout_period(&pwm_led[3], period[i]);            
+            pwmout_pulsewidth(&pwm_led[3], period[i]/2);
+            Mdelay(1000);
+      }
+
+      
+//        wait_ms(20);
+//        RtlMsleepOS(25);
+		pwm_delay();
+    }
+}
+