Diff: MAX518.cpp

Revision:

0:8ebf1c452028

Child:

1:aec29e73ffc1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX518.cpp	Thu Dec 20 10:36:17 2012 +0000
@@ -0,0 +1,105 @@
+/* MAX518 mbed interface library
+ * Copyright (c) 2012 ppatel
+ *
+ * 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.
+ */
+ 
+#include "MAX518.h"
+#include "mbed.h"
+
+// Class constructor, create i2c connection, update instance variables
+DAC::DAC(PinName sda, PinName scl, int address, int freq, bool ack) : i2c(sda, scl) {
+    _address = address;
+    _ack = ack;
+    i2c.frequency(freq);
+}
+
+// Set output of both DAC channels with ints 0 - 255
+bool DAC::setDAC(int a, int b) {
+    if (a > 255 || a < 0 || b > 255 || b < 0)
+        return false;                            // Return if int a or int b is out of range
+    int check = 0;                               // Counter for ACK signals
+
+    i2c.start();
+    check += i2c.write(_address);                // Write address
+    check += i2c.write(0);                       // Select Channel 1
+    check += i2c.write(a);                       // Write output value
+    check += i2c.write(1);                       // Select Channel 2
+    check += i2c.write(b);                       // Write output value
+    i2c.stop();                                  // End communication (trigger DAC to update outputs)
+    
+    if (_ack && check != 5) return false;        // Return false if device did not acknowledge when expected
+    else return true;
+}
+
+// Set output of DAC Channel 1 with int 0 - 255
+bool DAC::setCh1(int n) {
+    if (n > 255 || n < 0) return false;          // Return if n is out of range
+    int check = 0;                               // Counter for ACK signals
+
+    i2c.start();
+    check += i2c.write(_address);                // Write address
+    check += i2c.write(0);                       // Select Channel 1
+    check += i2c.write(n);                       // Write output value
+    i2c.stop();                                  // End communication (trigger DAC to update outputs)
+    
+    if (_ack && check != 3) return false;        // Return false if device did not acknowledge when expected
+    else return true;
+}
+
+// Set output of DAC Channel 2 with int 0 - 255
+bool DAC::setCh2(int n) {
+    if (n > 255 || n < 0) return false;          // Return if n is out of range
+    int check = 0;                               // Counter for ACK signals
+
+    i2c.start();
+    check += i2c.write(_address);                // Write address
+    check += i2c.write(1);                       // Select Channel 1
+    check += i2c.write(n);                       // Write output value
+    i2c.stop();                                  // End communication (trigger DAC to update outputs)
+    
+    if (_ack && check != 3) return false;        // Return false if device did not acknowledge when expected
+    else return true;
+}
+
+// Reset DAC (all outputs to 0)
+bool DAC::reset() {
+    int check = 0;                               // Counter for ACK signals
+
+    i2c.start();
+    check += i2c.write(_address);                // Write address
+    check += i2c.write(16);                      // Reset command (all outputs to 0)
+    i2c.stop();                                  // End communication (trigger DAC to update)
+    
+    if (_ack && check != 2) return false;        // Return false if device did not acknowledge when expected
+    else return true;
+}
+
+// Power down DAC into silent monitoring mode (outputs also go to 0)
+bool DAC::powerDown() {
+    int check = 0;                               // Counter for ACK signals
+
+    i2c.start();
+    check += i2c.write(_address);                // Write address
+    check += i2c.write(8);                       // Power down DAC into silent mode (outputs also go to 0)
+    i2c.stop();                                  // End communication (trigger DAC to update)
+    
+    if (_ack && check != 2) return false;        // Return false if device did not acknowledge when expected
+    else return true;
+}
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