IR Sensor, PanicButton, OneWireTempSensor

[svn42.git] / rf433ctl / OneWire / OneWire.h

diff --git a/rf433ctl/OneWire/OneWire.h b/rf433ctl/OneWire/OneWire.h
new file mode 100644 (file)
index 0000000..c579b94
--- /dev/null
+++ b/rf433ctl/OneWire/OneWire.h
@@ -0,0 +1,110 @@
+#ifndef OneWire_h
+#define OneWire_h
+
+#include <inttypes.h>
+
+// you can exclude onewire_search by defining that to 0
+#ifndef ONEWIRE_SEARCH
+#define ONEWIRE_SEARCH 1
+#endif
+
+// You can exclude CRC checks altogether by defining this to 0
+#ifndef ONEWIRE_CRC
+#define ONEWIRE_CRC 1
+#endif
+
+// Select the table-lookup method of computing the 8-bit CRC
+// by setting this to 1.  The lookup table no longer consumes
+// limited RAM, but enlarges total code size by about 250 bytes
+#ifndef ONEWIRE_CRC8_TABLE
+#define ONEWIRE_CRC8_TABLE 0
+#endif
+
+// You can allow 16-bit CRC checks by defining this to 1
+// (Note that ONEWIRE_CRC must also be 1.)
+#ifndef ONEWIRE_CRC16
+#define ONEWIRE_CRC16 0
+#endif
+
+#define FALSE 0
+#define TRUE  1
+
+class OneWire
+{
+  private:
+    uint8_t bitmask;
+    volatile uint8_t *baseReg;
+
+#if ONEWIRE_SEARCH
+    // global search state
+    unsigned char ROM_NO[8];
+    uint8_t LastDiscrepancy;
+    uint8_t LastFamilyDiscrepancy;
+    uint8_t LastDeviceFlag;
+#endif
+
+  public:
+    OneWire( uint8_t pin);
+
+    // Perform a 1-Wire reset cycle. Returns 1 if a device responds
+    // with a presence pulse.  Returns 0 if there is no device or the
+    // bus is shorted or otherwise held low for more than 250uS
+    uint8_t reset(void);
+
+    // Issue a 1-Wire rom select command, you do the reset first.
+    void select( uint8_t rom[8]);
+
+    // Issue a 1-Wire rom skip command, to address all on bus.
+    void skip(void);
+
+    // Write a byte. If 'power' is one then the wire is held high at
+    // the end for parasitically powered devices. You are responsible
+    // for eventually depowering it by calling depower() or doing
+    // another read or write.
+    void write(uint8_t v, uint8_t power = 0);
+
+    // Read a byte.
+    uint8_t read(void);
+
+    // Write a bit. The bus is always left powered at the end, see
+    // note in write() about that.
+    void write_bit(uint8_t v);
+
+    // Read a bit.
+    uint8_t read_bit(void);
+
+    // Stop forcing power onto the bus. You only need to do this if
+    // you used the 'power' flag to write() or used a write_bit() call
+    // and aren't about to do another read or write. You would rather
+    // not leave this powered if you don't have to, just in case
+    // someone shorts your bus.
+    void depower(void);
+
+#if ONEWIRE_SEARCH
+    // Clear the search state so that if will start from the beginning again.
+    void reset_search();
+
+    // Look for the next device. Returns 1 if a new address has been
+    // returned. A zero might mean that the bus is shorted, there are
+    // no devices, or you have already retrieved all of them.  It
+    // might be a good idea to check the CRC to make sure you didn't
+    // get garbage.  The order is deterministic. You will always get
+    // the same devices in the same order.
+    uint8_t search(uint8_t *newAddr);
+#endif
+
+#if ONEWIRE_CRC
+    // Compute a Dallas Semiconductor 8 bit CRC, these are used in the
+    // ROM and scratchpad registers.
+    static uint8_t crc8( uint8_t *addr, uint8_t len);
+
+#if ONEWIRE_CRC16
+    // Compute a Dallas Semiconductor 16 bit CRC. Maybe. I don't have
+    // any devices that use this so this might be wrong. I just copied
+    // it from their sample code.
+    static unsigned short crc16(unsigned short *data, unsigned short len);
+#endif
+#endif
+};
+
+#endif