Diff: iButton.cpp

Revision:

14:2d0b5e0f0aed

Parent:

12:27a1b359b95c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/iButton.cpp	Wed Aug 26 19:44:50 2020 +0000
@@ -0,0 +1,141 @@
+#include "iButton.h"
+
+extern Serial dbg;
+
+iButton::iButton(PinName IO) : io(IO)
+{
+}
+
+iButton::~iButton()
+{
+}
+
+void iButton::OneWireReset(void)
+{
+    io.output();
+    io = 0;
+    wait_us(500);
+    io.input();
+    wait_us(500);
+}
+
+void iButton::OneWireOutByte(unsigned char data)
+{
+    for (int n = 8;n!=0; n--)
+    {
+        if ((data & 0x01) == 1)
+        {
+            io.output();
+            io = 0;
+            wait_us(5);
+            io.input();
+            wait_us(60);
+        }
+        else 
+        {
+            io.output();
+            wait_us(60);
+            io.input();
+        }
+        data = data >> 1;
+    }
+}
+
+unsigned char iButton::OneWireReadByte(void)
+{
+    unsigned char d = 0;
+    unsigned char b;
+    for (int n = 0; n<8; n++)
+    {
+        io.output();
+        io = 0;
+        wait_us(5);
+        io.input();
+        wait_us(5);
+        b = io;
+        wait_us(50);
+        d = (d >> 1) | (b << 7);
+    }
+    return d;
+}
+
+void iButton::ResetData()
+{
+    detect.family = 0;
+    detect.serial.clear();
+    detect.crc = 0;
+    detect.valid = false;
+}
+
+void iButton::DetectiButton(void)
+{
+    unsigned char crc = 0;
+    
+    OneWireReset();
+    OneWireOutByte(0x33);
+    
+    ResetData();
+    
+    detect.family = OneWireReadByte();
+    crc = crc8(crc, detect.family);
+    if (detect.family == 0x00 || detect.family == 0xFF)
+    {
+        detect.valid = false;
+        return;
+    }
+    
+    for (int i = 0; i <6; i++)
+    {
+//        detect.serial[i] = OneWireReadByte();
+        detect.serial.push_back(OneWireReadByte());
+        crc = crc8(crc, detect.serial[i]);
+    }
+    detect.crc = OneWireReadByte();
+    if (crc == detect.crc)
+    {
+        detect.valid = true;
+    }
+    //dbg.printf("[Detect Ibutton]\r\n");
+    return;
+}
+
+std::string conv(const unsigned char &val)
+{
+    char st[5];
+    sprintf(st,"%02X",val);
+    return st;
+}
+
+bool iButton::IsTaping(void)
+{
+    return detect.valid;
+}
+
+std::string iButton::GetData(void)
+{
+    size_t sz = detect.serial.size();
+    string ret = "";
+    
+    for(int i=sz-1; i>=0; i--)
+    {
+        ret += conv(detect.serial[i]);
+    }
+    return ret;
+}
+
+unsigned char iButton::crc8(unsigned char crc, unsigned char data)
+{
+    crc = crc ^ data;
+    for (int i = 0; i < 8; i++)
+    {
+        if (crc & 0x01)
+        {
+            crc = (crc >> 1) ^ 0x8C; 
+        }
+        else
+        {
+            crc >>= 1; 
+        }
+    }
+    return crc;
+}