Library for the Grove 4 digit display, for use with the NCS36510 mbed board
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Diff: DigitDisplay.cpp
- Revision:
- 0:d3173c8bfd48
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DigitDisplay.cpp Sat Feb 08 05:42:09 2014 +0000 @@ -0,0 +1,317 @@ +/* The library of Grove - 4 Digit Display + * + * \author Yihui Xiong + * \date 2014/2/8 + * + * The MIT License (MIT) + * + * Copyright (c) 2014 Seeed Technology Inc. + * + * 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 "DigitDisplay.h" + +#define ADDR_AUTO 0x40 +#define ADDR_FIXED 0x44 + +#define POSITION_COLON 1 + +#define DIGIT_UNKOWN 0x08 +#define DIGIT_NULL 0x00 +#define DIGIT_MINUS 0x40 + +const uint8_t DIGIT_TABLE[] = {0x3f, 0x06, 0x5b, 0x4f, + 0x66, 0x6d, 0x7d, 0x07, + 0x7f, 0x6f, 0x77, 0x7c, + 0x39, 0x5e, 0x79, 0x71 + }; //0~9,A,b,C,d,E,F + + +inline uint8_t conv(uint8_t n) +{ + uint8_t segments; + + if (n <= sizeof(DIGIT_TABLE)) { + segments = DIGIT_TABLE[n]; + }else if (n == 0xFF) { + segments = DIGIT_NULL; + } else { + segments = DIGIT_UNKOWN; + } + + return segments; +} + +DigitDisplay::DigitDisplay(PinName clk, PinName dio) : _clk(clk), _dio(dio) +{ + _dio.output(); + _dio = 1; + _clk = 1; + + _brightness = 2; + _colon = false; + _off = true; + + for (uint8_t i = 0; i < sizeof(_content); i++) { + _content[i] = DIGIT_NULL; + } +} + +void DigitDisplay::on() +{ + start(); + send(0x88 | _brightness); + stop(); +} + +void DigitDisplay::off() +{ + start(); + send(0x80); + stop(); +} + +void DigitDisplay::setBrightness(uint8_t brightness) +{ + if (brightness > 7) { + brightness = 7; + } + + _brightness = brightness; + + start(); + send(0x88 | _brightness); + stop(); +} + +void DigitDisplay::setColon(bool enable) +{ + if (_colon != enable) { + _colon = enable; + + if (enable) { + _content[POSITION_COLON] |= 0x80; + } else { + _content[POSITION_COLON] &= 0x7F; + } + + writeRaw(POSITION_COLON, _content[POSITION_COLON]); + } +} + +void DigitDisplay::write(int16_t n) +{ + uint8_t negative = 0; + + if (n < 0) { + negative = 1; + n = (-n) % 1000; + } else { + n = n % 10000; + } + + int8_t i = 3; + do { + uint8_t r = n % 10; + _content[i] = conv(r); + i--; + n = n / 10; + } while (n != 0); + + if (negative) { + _content[i] = DIGIT_MINUS; + i--; + } + + for (int8_t j = 0; j <= i; j++) { + _content[j] = DIGIT_NULL; + } + + if (_colon) { + _content[POSITION_COLON] |= 0x80; + } + + writeRaw(_content); +} + +void DigitDisplay::write(uint8_t numbers[]) +{ + for (uint8_t i = 0; i < 4; i++) { + _content[i] = conv(numbers[i]); + } + + if (_colon) { + _content[POSITION_COLON] |= 0x80; + } + + start(); + send(ADDR_AUTO); + stop(); + start(); + send(0xC0); + for (uint8_t i = 0; i < 4; i++) { + send(_content[i]); + } + stop(); + + if (_off) { + _off = 0; + start(); + send(0x88 | _brightness); + stop(); + } +} + +void DigitDisplay::write(uint8_t position, uint8_t number) +{ + if (position >= 4) { + return; + } + + uint8_t segments = conv(number); + + if ((position == POSITION_COLON) && _colon) { + segments |= 0x80; + } + + _content[position] = segments; + + start(); + send(ADDR_FIXED); + stop(); + start(); + send(0xC0 | position); + send(segments); + stop(); + + if (_off) { + _off = 0; + start(); + send(0x88 | _brightness); + stop(); + } +} + +void DigitDisplay::writeRaw(uint8_t segments[]) +{ + for (uint8_t i = 0; i < 4; i++) { + _content[i] = segments[i]; + } + + start(); + send(ADDR_AUTO); + stop(); + start(); + send(0xC0); + for (uint8_t i = 0; i < 4; i++) { + send(segments[i]); + } + stop(); + + if (_off) { + _off = 0; + start(); + send(0x88 | _brightness); + stop(); + } +} + +void DigitDisplay::writeRaw(uint8_t position, uint8_t segments) +{ + if (position >= 4) { + return; + } + + _content[position] = segments; + + start(); + send(ADDR_FIXED); + stop(); + start(); + send(0xC0 | position); + send(segments); + stop(); + + if (_off) { + _off = 0; + start(); + send(0x88 | _brightness); + stop(); + } +} + +void DigitDisplay::clear() +{ + for (uint8_t i = 0; i < 4; i++) { + _content[i] = DIGIT_NULL; + } + _colon = false; + + writeRaw(0, DIGIT_NULL); + writeRaw(1, DIGIT_NULL); + writeRaw(2, DIGIT_NULL); + writeRaw(3, DIGIT_NULL); +} + +void DigitDisplay::start() +{ + _clk = 1; + _dio = 1; + _dio = 0; + _clk = 0; +} + +bool DigitDisplay::send(uint8_t data) +{ + for (uint8_t i = 0; i < 8; i++) { + _clk = 0; + _dio = data & 1; + data >>= 1; + _clk = 1; + } + + // check ack + _clk = 0; + _dio = 1; + _clk = 1; + _dio.input(); + + uint16_t count = 0; + while (_dio) { + count++; + if (count >= 200) { + _dio.output(); + return false; + } + } + + _dio.output(); + return true; +} + +void DigitDisplay::stop() +{ + _clk = 0; + _dio = 0; + _clk = 1; + _dio = 1; +} + +