mbed_example / Mbed OS BusIn_HelloWorld

BusIn HelloWorld

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Use

BusIn is an abstraction that takes any pins and makes them appear as though they are linearly memory mapped for ease of use. This abstraction is useful for checking multiple inputs in a single pass. In general this abstraction can be used to make code less cluttered, clearer, and take less time to write.

Note

Please pay attention to the ordering of pins in the initialization. The order pins are initialized in are the reverse order that bits are OR'd together.

API

API reference.

Import librarymbed

No documentation found.

Diff: main.cpp

Revision:
4:252fbf8e71db
Parent:
3:ac45ca465b45
Child:
5:81a0449aa2d5
--- a/main.cpp	Fri Mar 27 20:07:02 2015 +0000
+++ b/main.cpp	Fri Mar 27 22:35:08 2015 +0000
@@ -16,13 +16,20 @@
 
 #include "mbed.h"
 
-BusIn nibble(p5, p6, p18, p11); // change pins according to platform
+BusIn nibble(D0, D1, D2, D3); // change pins according to platform
 
 int main() {
     while(1) {
-        switch(nibble) {
-            case 0x3: printf("Hello!\n"); break; // p5 and p6 are 1
-            case 0x8: printf("World!\n"); break; // p11 is 1
+        switch(nibble) { // read the bus
+            case 0x0: printf("0b0000, D3,D2,D1,D0 are off");break;
+            case 0x1: printf("0b0001,          D0 is on")  ;break;
+            case 0x2: printf("0b0010,       D1    is on")  ;break; 
+            case 0x3: printf("0b0011,       D1,D0 are on") ;break;
+            case 0x4: printf("0b0100,    D2       is on")  ;break;
+            // ...
+            case 0x8: printf("0b1000, D3          is on")  ;break; 
+            // ...
+            case 0xF: printf("0b1111, D3,D2,D1,D0 are on") ;break;
         }
     }
 }
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