7-Segment Display Driver class, via an 8-bit shift register (such as the 74HC595)
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