Diff: IR.cpp

Revision:

0:c74b212c3cbf

Child:

1:71ca050c4d05

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IR.cpp	Thu Jun 26 13:56:36 2014 +0000
@@ -0,0 +1,145 @@
+//**********************
+// IR.cpp for mbed
+//
+// IR ir(P0_12);
+//
+// (1)NEC format
+// IR carrier=38KHz
+// Time unit=0.56ms
+// logical 0 = on 1T + off 1T
+// logical 1 = on 1T + off 3T
+// reader=on 16T + off 8T
+// stop=on 1T + 8ms
+// frame=108ms
+//
+// (2)Standard IR format
+// IR carrier=33 - 40KHz
+// Time unit=0.35 - 0.50ms
+// logical 0 = on 1T + off 1T
+// logical 1 = on 1T + off 3T
+// reader=on 8T + off 4T
+// trailer=on 1T + 8ms
+//
+// (3)SONY format
+// IR carrier=40KHz
+// Time unit=0.6ms
+// logical 0 = off 1T + on 1T
+// logical 1 = off 1T + on 2T
+// reader=on 4T
+//
+// caution:
+// no detecting repeat code, return bits=0;
+//
+// (C)Copyright 2014 All rights reserved by Y.Onodera
+// http://einstlab.web.fc2.com
+//**********************
+
+#include "mbed.h"
+#include "IR.h"
+
+IR::IR (PinName irin) : _irin(irin){
+    init();
+}
+
+
+void IR::init()
+{
+    _irin.mode(PullUp);
+}
+
+unsigned char IR::CountHigh(){
+
+    unsigned char i=0;
+
+    while(_irin==1);    // wait
+
+    while(_irin==0){
+        ++i;
+        wait_us(26);
+        wait_us(26);
+        if(i==0) return 0;
+    }
+    // NEC:i=19*8=152, i*2*26.5us=8056us
+    // STD:i=19*4=76,  i*2*26.5us=4028us
+    // 1T:i=19*1=19
+
+    return i;
+
+}
+
+
+unsigned char IR::CountLow(){
+
+    unsigned char i=0;
+
+    while(_irin==0);    // wait
+
+    while(_irin==1){
+        ++i;
+        wait_us(26);
+        if(i==0) return 0;
+    }
+    // NEC:i=19*8=152, i*26.5us=4028us
+    // STD:i=19*4=76,  i*26.5us=2014us
+    // 1T:i=19*1=19
+    // 3T:i=19*3=57
+
+    return i;
+
+}
+
+
+void IR::GetIR2(){
+
+    unsigned char i,j;
+    unsigned char k;
+
+    bits=0;
+    for(j=0;j<16;j++){
+        for(i=0;i<8;i++){
+            k = CountHigh()*2;
+            if(mode==3){
+                buf[j]>>=1;
+                // Threschold = 35, 23 = 1T, 46 = 2T; for SONY
+                buf[j]+=((k>30) ? 0x80: 0);
+                ++bits;
+            }
+            k = CountLow();
+            if(k==0){
+                buf[j]>>=(8-i);
+                return;
+            }
+            if(mode!=3){
+                buf[j]>>=1;
+                // Threschold = 38, 19 = 1T, 57 = 3T; for NEC
+                // Threschold = 30, 15 = 1T, 45 = 3T; for STD
+                buf[j]+=((k>30) ? 0x80: 0);
+                ++bits;
+            }
+        }
+    }
+
+}
+
+
+void IR::GetIR(){
+
+    unsigned char i;
+
+    i = CountHigh();    // Start
+    mode=0;
+    if(40<i){
+        if(i<51){
+            mode=3; // SONY, 46
+        }else{
+            if(100<i){
+                mode=1; // NEC, 173
+            }else{
+                mode=2; // STD, 54-77
+            }
+        }
+        i = CountLow();
+        GetIR2();
+    }
+
+}