1 files changed, 99 insertions, 0 deletions
diff --git a/libraries/Wire/Wire.h b/libraries/Wire/Wire.h
new file mode 100644
index 0000000..62e37bd
--- /dev/null
+++ b/libraries/Wire/Wire.h
@@ -0,0 +1,99 @@
+/* *****************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 LeafLabs LLC.
+ *
+ * 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.
+ * ****************************************************************************/
+
+/**
+ *  @brief Wire library, ported from Arduino. Provides a lean
+ *  interface to I2C (two-wire) communication.
+ */
+
+#include "wirish.h"
+
+#ifndef _WIRE_H_
+#define _WIRE_H_
+
+typedef struct {
+  uint8 scl;
+  uint8 sda;
+} Port;
+
+/* You must update the online docs if you change this value. */
+#define WIRE_BUFSIZ 32
+
+/* return codes from endTransmission() */
+#define SUCCESS   0        /* transmission was successful */
+#define EDATA     1        /* too much data */
+#define ENACKADDR 2        /* received nack on transmit of address */
+#define ENACKTRNS 3        /* received nack on transmit of data */
+#define EOTHER    4        /* other error */
+
+#define SDA 20
+#define SCL 21
+
+#define I2C_WRITE 0
+#define I2C_READ  1
+
+#define I2C_DELAY do{for(int i=0;i<50;i++) {asm volatile("nop");}}while(0)
+
+class TwoWire {
+ private:
+    uint8 rx_buf[WIRE_BUFSIZ];      /* receive buffer */
+    uint8 rx_buf_idx;               /* first unread idx in rx_buf */
+    uint8 rx_buf_len;               /* number of bytes read */
+
+    uint8 tx_addr;                  /* address transmitting to */
+    uint8 tx_buf[WIRE_BUFSIZ];      /* transmit buffer */
+    uint8 tx_buf_idx;  /* next idx available in tx_buf, -1 overflow */
+    boolean tx_buf_overflow;
+    Port port;
+    uint8 writeOneByte(uint8);
+    uint8 readOneByte(uint8, uint8*);
+ public:
+    TwoWire();
+    void begin();
+    void begin(uint8, uint8);
+    void beginTransmission(uint8);
+    void beginTransmission(int);
+    uint8 endTransmission(void);
+    uint8 requestFrom(uint8, int);
+    uint8 requestFrom(int, int);
+    void send(uint8);
+    void send(uint8*, int);
+    void send(int);
+    void send(int*, int);
+    void send(char*);
+    uint8 available();
+    uint8 receive();
+};
+
+void    i2c_start(Port port);
+void    i2c_stop(Port port);
+boolean i2c_get_ack(Port port);
+void    i2c_send_ack(Port port);
+void    i2c_send_nack(Port port);
+uint8   i2c_shift_in(Port port);
+void    i2c_shift_out(Port port, uint8 val);
+
+extern TwoWire Wire;
+
+#endif // _WIRE_H_