Diff: example3.h

Revision:

0:fcfb13f40846

Child:

1:d7803001a259

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/example3.h	Tue Jan 18 17:31:19 2011 +0000
@@ -0,0 +1,92 @@
+/*
+    Copyright (c) 2010 Andy Kirkham
+ 
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+ 
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+ 
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+*/
+
+#ifdef AJK_COMPILE_EXAMPLE3
+
+#include "mbed.h"
+#include "FPointer.h"
+
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+// Create a data structure that matches what you need.
+// In this example the structure just holds an int and
+// a float. Your own data structure can be constructed
+// however you need.
+typedef struct {
+    int     i_value;
+    float   f_value;
+} MYDATA;
+
+// The call back function. 
+uint32_t myCallback(uint32_t value) {
+
+    // Get the value of the count in main
+    // (deference it) so we know what it is.
+    // Note, Mbed/LPC17xx pointers are 32bit
+    // values. So we can "cast" a value back
+    // into a pointer.
+    MYDATA *q = (MYDATA *)value;
+    
+    // Then display the bottom four bits of
+    // the i_value on the LEDs.
+    led4 = (q->i_value & 1) ? 1 : 0;
+    led3 = (q->i_value & 2) ? 1 : 0;
+    led2 = (q->i_value & 4) ? 1 : 0;
+    led1 = (q->i_value & 8) ? 1 : 0;
+    
+    // Note, f_value isn't used but we could access
+    // it's value with q->f_value if we needed to.
+    
+    // What we return doesn't matter as it's
+    // not used in this example but we return
+    // "something" (zero in this case) to keep
+    // teh compiler happy as it expects us to
+    // return something.
+    return 0;
+}
+
+int main() {
+    FPointer myPointer;
+    MYDATA data;
+    
+    data.i_value = 0;
+    data.f_value = 0.0;
+    
+    // Attach a C function pointer as the callback.
+    myPointer.attach(&myCallback);
+    
+    while(1) {
+        wait(0.5);
+        
+        // Make the callback passing a pointer
+        // to the data structure "data".
+        myPointer.call((uint32_t)&data);
+        
+        // Increment the i_value by one.
+        data.i_value++;
+    }
+}
+
+#endif