7-Segment Display Driver class, via an 8-bit shift register (such as the 74HC595)
7SegSRDriver.h
- Committer:
- paul80nd
- Date:
- 2011-05-01
- Revision:
- 1:e55f543bc06b
- Parent:
- 0:1832d0ed8da8
File content as of revision 1:e55f543bc06b:
/* 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 8-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