Diff: dins-r8_i2c.cpp

Revision:

2:b72096b1e461

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dins-r8_i2c.cpp	Tue Aug 04 18:52:24 2015 +1000
@@ -0,0 +1,98 @@
+/**
+ * File:      dins-r8.cpp
+ * 
+ * Author:    Modtronix Engineering - www.modtronix.com
+ * 
+ * Description:
+ * 
+ * Software License Agreement:
+ * This software has been written or modified by Modtronix Engineering. The code
+ * may be modified and can be used free of charge for commercial and non commercial
+ * applications. If this is modified software, any license conditions from original
+ * software also apply. Any redistribution must include reference to 'Modtronix
+ * Engineering' and web link(www.modtronix.com) in the file header. 
+ * 
+ * THIS SOFTWARE IS PROVIDED IN AN 'AS IS' CONDITION. NO WARRANTIES, WHETHER EXPRESS,
+ * IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE
+ * COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
+ * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
+ */ 
+
+#include "mbed.h"
+#include "dins-r8_i2c.h"
+#include <algorithm>    // std::min
+
+
+// DEFINES ////////////////////////////////////////////////////////////////////
+/** Write to all relays. Each bit of byte is 1 relayCursor moves backwards, no parameters */
+#define CMD_WRITE_ALL_RELAYS            0x80
+
+
+// GLOBAL VARIABLES ///////////////////////////////////////////////////////////
+
+
+// Function Prototypes ////////////////////////////////////////////////////////
+
+
+DINS_R8_I2C::DINS_R8_I2C(I2C* i2cBus) {
+    pI2C = i2cBus;
+    i2cAdr = 0x60;      //Default I2C address of the LCD
+    relays = 0;         //All relays off
+}
+
+
+/** Writes given relay with given value
+ *
+ * @param relayNumber Relay to update, number from 1 to 8
+ *
+ * @param value New value, 0 if off, 1 is on
+ *
+ * @returns 0 if success, else error code
+ */
+uint8_t DINS_R8_I2C::writeRelay(int8_t relayNumber, bool value) {
+    uint8_t mask;
+    uint8_t relaysNew;
+
+    relayNumber--;
+    if(relayNumber>7) {
+        return DINS_R8_ERR_INVALID_RELAY;       //Error, invalid Relay Number
+    }
+    mask = 0x01 << relayNumber;
+
+    //Clear given relay
+    relaysNew = relays & (~mask);
+    if(value==true) {
+        relaysNew |= mask;  //Set given relay
+    }
+
+    return writeAllRelays(relaysNew);
+}
+
+
+/** Set all relays with new values. Each bit is 1 relay
+ *
+ * @param relays New values for relays, each bit is 1 relay
+ *
+ * @returns 0 if success, else error code
+ */
+uint8_t DINS_R8_I2C::writeAllRelays(int8_t relays) {
+    char cmd[4];
+
+    if(this->relays != relays) {
+
+        this->relays = relays;
+
+        //- First byte of data is 0x80 ("Write All Relays" command for DINS-8R board)
+        //- Second byte of data is 0x0f (value of relays for DINS-8R board)
+        cmd[0] = CMD_WRITE_ALL_RELAYS;
+        cmd[1] = relays;
+        return pI2C->write(i2cAdr, cmd, 2);
+
+    }
+
+    return 0;   //Success
+}
+
+
+