Diff: 7SegSRDriver.h

Revision:

0:1832d0ed8da8

Child:

1:e55f543bc06b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/7SegSRDriver.h	Sun May 01 16:13:00 2011 +0000
@@ -0,0 +1,109 @@
+/* mbed 7-Segment Display Driver Library (via an 8bit Shift Register)
+ * Copyright (c) 2011 Paul Law
+ *
+ * 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.
+ */
+
+#ifndef LIB_SSEGSRDRIVER_H
+#define LIB_SSEGSRDRIVER_H
+
+#include "mbed.h"
+
+#define SSegSRDriver_COMN_ANODE 0
+#define SSegSRDriver_COMN_CATHODE 1
+
+//Char defs: 0123456789AbCdEF
+const unsigned char SSegSRDriver_chardefs[16] = {0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71 };
+
+/** 7-Segment Display Driver class, via a 7-bit shift register (such as the 74HC595)
+ *
+ * Display should be hooked up to shift register as follows:
+ * Q0 : Decimal Point, Q1-Q7 : Segments a-g
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "7SegSRDriver.h"
+ *
+ * SSegSRDriver display(p27,p25,p26, SSegSRDriver_COMN_ANODE);
+ *
+ * int main() {
+ *     while (1) {
+ *         // Show the chars 0-9 then A-F, flashing the decimal point on and off
+ *         for (int i=0; i<16; i++) {
+ *             display.write(i,i%2 == 0);
+ *             wait(1);
+ *         }
+ *     }
+ * }
+ * @endcode
+ */
+class SSegSRDriver {
+
+public:
+
+    /** Create a 7-Segment Display Driver object connected to a 8-bit shift register on the given DigitalOut pins
+     *
+     * @param srData Shift Register Data pin (DigitalOut)
+     * @param srClock Shift Register Clock pin (DigitalOut)
+     * @param srLatch Shift Register Latch pin (DigitalOut)
+     * @param disp_type Display Type: Common Anode/Cathode (SSegSRDriver_COMN_ANODE (0) or SSegSRDriver_COMN_CATHODE (1))
+     */
+    SSegSRDriver(PinName srData, PinName srClock, PinName srLatch, bool disp_type);
+
+    /** Change the type of 7-Segment Display
+     *
+     * @param disp_type Display Type: Common Anode/Cathode (SSegSRDriver_COMN_ANODE (0) or SSegSRDriver_COMN_CATHODE (1))
+     */
+    void set_type(bool disp_type);
+    
+    /** Sets the currently shown digit on the display
+     *
+     * @param number The digit to display (0-15) to show numbers 0-9 and letters A-F
+     */
+    void write(unsigned char number); 
+    
+    /** Sets the currently shown digit on the display along with the decimal place
+     *
+     * @param number The digit to display (0-15) to show numbers 0-9 and letters A-F
+     * @param dp If the decimal place should be lit (0:Off, 1:On)
+     */
+    void write(unsigned char number, bool dp);   
+    
+    /** Sets the segments of the display directly
+     * Segments are lit by binary flags where LSB is the decimal point, then segments a-g up to the MSB
+     * e.g. to light segments e, f and the decimal place = 01100001
+     *
+     * @param bValue The segments to light
+     */
+    void write_raw(unsigned char number);   // Write directly to the display - Q0/Q1-Q7
+    
+    /** Turn all segments of the display off
+     */
+    void clear();   // Clears the display
+    
+private:
+
+    DigitalOut _srData;
+    DigitalOut _srClock;
+    DigitalOut _srLatch;
+    bool _disp_type;
+};
+
+#endif
\ No newline at end of file