Diff: PwmDAC.h

Revision:

0:13e0b9ea312f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PwmDAC.h	Sun Sep 15 22:20:47 2013 +0000
@@ -0,0 +1,139 @@
+/* Author:  Tobias Wulf
+ * Date:    13.09.2013
+ * Reason:  don't know why...
+ *
+ * http://www.ascii-art.de/ascii/my/
+ *                                                        Z
+  |\/|     /\  _ _oo   /\ .__|_                   Z
+  |  |\/  /--\_>(_||  /--\|  |_   .,.,        z
+      /                          ((((())    z
+                               ((('_  _`) '
+    _______________________    ((G   \ |)      ___________________
+                              (((`   " ,
+                               .((\.:~:          .--------------.
+     The product               __.| `"'.__      | \              |
+                            .''   `---'   `.    |  .             :
+     of hard work          /                `   |   `-.__________)
+                          |             ~       |  :             :
+     for many many        |                     |  :  |
+                          |    _                |     |   [ ##   :
+     hours ...             \    `--.        ____|  ,   oo_______.'
+                            `_   ( \) _____/     `--___
+                            | `--)  ) `-.   `---   ( - a:f -
+                            |   '///`  | `-.
+                            |     | |  |    `-.
+                            |     | |  |       `-.
+                            |     | |\ |
+                            |     | | \|
+                             `-.  | |  |
+                                `-| '
+ */
+
+#include "mbed.h"
+
+#ifndef MBED_PWMDAC_H
+#define MBED_PWMDAC_H
+
+#ifndef SYS_CLK
+#define SYS_CLK 96000000 // Hz
+#endif
+
+
+ /**
+ * Is used as PWM port with possibility 
+ * to update all PWM channel at once. So you can use it
+ * although as multichannel DAC with lowpass filters
+ * wich match your application.
+ * For deeper information look at the wiki.
+ *
+ * If you want to use only one PWM or you have some other
+ * plans for the rest of the PWM port you should use FastPwm
+ * or PwmOut objects
+ * 
+ * This is only working for mbed LPC1768!!
+ */
+
+
+
+class PwmDAC {
+
+    public:
+    
+        /**
+        * Initialize the PwmDAC object wich set up all channels. 
+        */
+        void init();
+        
+        /**
+        * Deactivate a single channel and pull it to ground (intern pull down)
+        * or deactivate all if ch greater than 5.
+        * @param - ch is an integer number 0 - 5.
+        */
+        void deactivate(unsigned int ch);
+
+        /**
+        * Activate a single channel and deactivate intern pull up/ down
+        * or activate all if ch greater than 5.
+        * @param - ch is an integer number 0 - 5.
+        */
+        void activate(unsigned int ch);
+        
+        /**
+        * Set PWM frequency in Hz. This setting includes all channels.
+        * Maximum is 48000000Hz.
+        * @param - frequency in Hz. Argument is type of double
+        */
+        void setFrequency(double frequency);
+        
+        /**
+        * Set PWM period in seconds
+        * @param - seconds is type of double
+        */
+        void setPeriod(double seconds);
+        
+        /**
+        * Set the PWM step resolution. Use it instead setFrequency()
+        * @param - resolution min is 2 max is 2^31
+        */
+        void setResolution(uint32_t resolution);
+        
+        /**
+        * Update the 6 PWM channels.
+        * @param - argument must be an array larger 6 and type of double
+        */
+        void updateDuty(double duty[]);
+        
+        /**
+        * Update the 6 PWM channels.
+        * @param - argument must be an array larger 6 and type of double
+        */
+        void updatePulsewidth(double pulsewidth[]);
+        
+        /**
+        * Update the 6 PWM channels.
+        * @param - argument must be an array larger 6 and type of uint32_t
+        */
+        void updateSteps(uint32_t steps[]);
+
+        /**
+        * Stop PWM
+        */
+        void stop();
+        
+        /**
+        * Start PWM
+        */
+        void start();
+
+    private:
+        double _frequency; // [Hz]
+        double _period; // [sec]
+        double _pulsewidth[6]; // [sec]
+        double _duty[6]; // [%]
+        uint32_t _steps[6];
+        uint32_t _resolution;
+        bool _allActive;
+        
+        __IO uint32_t *MR[7];
+};
+#endif
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