Revision 0:fe20e27c6295, committed 2013-11-08

Comitter:

leejong87

Date:

Fri Nov 08 05:09:02 2013 +0000

Child:

1:e12749a24efd

Commit message:

IR Remote Control (38Khz)

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IRremote.cpp	Fri Nov 08 05:09:02 2013 +0000
@@ -0,0 +1,72 @@
+#include "IRremote.h"
+#include "mbed.h"
+
+//IR Timer
+int IR_cnt, IR_state, IR_bit_cnt, IR_temp;
+char IR_buf[4];
+
+void IR_check()
+{
+    if(IR_cnt<150) {
+        IR_cnt++;
+    }
+    if(IR_cnt>=150) {
+        IR_state=1;
+    }
+}
+
+//ReceiveIR
+void IR_start()
+{
+
+    switch(IR_state) {
+        case 1:
+            if((IR_cnt>85)&&(IR_cnt<140)) {
+                IR_state=2;    // Lead
+                IR_bit_cnt=IR_temp=0;
+            }
+            break;
+        case 2:
+            if(IR_cnt> 25) {
+                IR_state=1;    // Error
+                break;
+            } else if(IR_cnt>=15) {
+                IR_temp|=0x80;      // Data 1 : 2.250ms(22)(0.56ms+1.69ms ) / 2ms
+            } else if(IR_cnt>= 8) {
+                IR_temp|=0x00;      // Data 0 : 1.125ms(12)(0.56ms+0.565ms) / 1ms
+            } else               {
+                IR_state=1;    // Error
+                break;
+            }
+            if((++IR_bit_cnt%8)==0) {
+                IR_buf[(IR_bit_cnt/8)-1]=IR_temp;
+                IR_temp=0;
+                if(IR_bit_cnt>=32) {
+                    IR_state=1;
+                    IR_bit_cnt=0;
+                }
+            }
+            IR_temp>>=1;
+            break;
+    }
+    IR_cnt=0;
+}
+
+IRremote::IRremote(PinName pin) : _pin(pin)
+{
+    _pin.mode(PullUp);
+    _pin.fall(&IR_start);
+    IR_timer.attach_us(&IR_check, 100.0);
+}
+
+char IRremote::read(int ir_i)
+{
+    char IR_rx;
+    if(ir_i<4) {
+        IR_rx=IR_buf[ir_i];
+        IR_buf[ir_i]=0xFF;
+    } else {
+        IR_rx=0xFF;;
+    }
+    return IR_rx;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IRremote.h	Fri Nov 08 05:09:02 2013 +0000
@@ -0,0 +1,18 @@
+#ifndef MBED_IRremote_H
+#define MBED_IRremote_H
+ 
+#include "mbed.h"
+ 
+class IRremote {
+public:
+    IRremote(PinName pin);
+    char read(int ir_i);
+    
+private:
+    InterruptIn _pin;
+    Ticker IR_timer;
+};
+ 
+#endif
+
+ 
\ No newline at end of file