Diff: 1wire.h

Revision:

0:445fe6e6bd68

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/1wire.h	Mon Apr 28 06:52:49 2014 +0000
@@ -0,0 +1,94 @@
+#ifndef _1WIRE_H
+#define _1WIRE_H
+
+/* Dallas 1-wire driver with DS18B20 temperature sensor support
+ *
+ * Copyright (c) 2014 Ales Povalac, MIT License
+ *
+ * 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.
+ */
+
+class OneWire
+{
+public:
+    OneWire(PinName OwUp, PinName OwDn, PinName OwIn);
+
+    void ConvertAll(bool wait);
+    int ReadTemperature(uint8_t *ROMID, int *result);
+    
+    int First(uint8_t *ROMID);
+    int Next(uint8_t *ROMID);
+
+    void WriteByte(uint8_t data);
+    uint8_t ReadByte(void);
+    void SendCmd(uint8_t *ROMID, uint8_t cmd);
+    void CRC(uint8_t x, uint8_t *crc);
+    
+private:
+    DigitalOut _OwUp;
+    DigitalOut _OwDn;
+    DigitalIn _OwIn;
+
+    uint8_t OW_LastDevice;
+    uint8_t OW_LastDiscrepancy;
+    uint8_t OW_LastFamilyDiscrepancy;
+
+    int Reset(void);
+    void WriteBit(int bit);
+    int ReadBit(void);
+};
+        
+
+/* INTERNAL CONSTANTS everything below this line */
+
+#define ERR_BADCRC      0x8000
+#define ERR_BADFAMILY   0x8001
+
+/* Return codes for OWFirst()/OWNext() */
+#define OW_BADWIRE      -3
+#define OW_BADCRC       -2
+#define OW_NOPRESENCE   -1
+#define OW_NOMODULES    0
+#define OW_FOUND        1
+
+/* General 1 wire commands */
+#define OW_SEARCH_ROM_CMD   0xF0
+#define OW_READ_ROM_CMD     0x33
+#define OW_MATCH_ROM_CMD    0x55
+#define OW_SKIP_ROM_CMD     0xCC
+
+/* DS1820 commands */
+#define OW_CONVERT_T_CMD    0x44
+#define OW_RD_SCR_CMD       0xBE
+#define OW_WR_SCR_CMD       0x4E
+
+
+/* 1-wire delays */
+#define DELAY_A() wait_us(6)
+#define DELAY_B() wait_us(64)
+#define DELAY_C() wait_us(60)
+#define DELAY_D() wait_us(10)
+#define DELAY_E() wait_us(9)
+#define DELAY_F() wait_us(55)
+#define DELAY_G()
+#define DELAY_H() wait_us(480)
+#define DELAY_I() wait_us(70) 
+#define DELAY_J() wait_us(410)
+
+/* Other */
+#define CONVERT_T_DELAY 750
+
+#endif