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王立帮
258
arduino-cli/libraries/TM1637-master/TM1637Display.cpp
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258
arduino-cli/libraries/TM1637-master/TM1637Display.cpp
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// Author: avishorp@gmail.com
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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extern "C" {
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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}
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#include <TM1637Display.h>
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#include <Arduino.h>
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#define TM1637_I2C_COMM1 0x40
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#define TM1637_I2C_COMM2 0xC0
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#define TM1637_I2C_COMM3 0x80
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//
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// A
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// ---
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// F | | B
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// -G-
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// E | | C
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// ---
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// D
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const uint8_t digitToSegment[] = {
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// XGFEDCBA
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0b00111111, // 0
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0b00000110, // 1
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0b01011011, // 2
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0b01001111, // 3
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0b01100110, // 4
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0b01101101, // 5
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0b01111101, // 6
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0b00000111, // 7
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0b01111111, // 8
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0b01101111, // 9
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0b01110111, // A
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0b01111100, // b
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0b00111001, // C
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0b01011110, // d
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0b01111001, // E
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0b01110001 // F
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};
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static const uint8_t minusSegments = 0b01000000;
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TM1637Display::TM1637Display(uint8_t pinClk, uint8_t pinDIO, unsigned int bitDelay)
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{
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// Copy the pin numbers
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m_pinClk = pinClk;
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m_pinDIO = pinDIO;
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m_bitDelay = bitDelay;
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// Set the pin direction and default value.
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// Both pins are set as inputs, allowing the pull-up resistors to pull them up
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pinMode(m_pinClk, INPUT);
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pinMode(m_pinDIO,INPUT);
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digitalWrite(m_pinClk, LOW);
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digitalWrite(m_pinDIO, LOW);
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}
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void TM1637Display::setBrightness(uint8_t brightness, bool on)
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{
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m_brightness = (brightness & 0x7) | (on? 0x08 : 0x00);
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}
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void TM1637Display::setSegments(const uint8_t segments[], uint8_t length, uint8_t pos)
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{
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// Write COMM1
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start();
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writeByte(TM1637_I2C_COMM1);
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stop();
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// Write COMM2 + first digit address
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start();
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writeByte(TM1637_I2C_COMM2 + (pos & 0x03));
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// Write the data bytes
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for (uint8_t k=0; k < length; k++)
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writeByte(segments[k]);
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stop();
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// Write COMM3 + brightness
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start();
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writeByte(TM1637_I2C_COMM3 + (m_brightness & 0x0f));
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stop();
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}
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void TM1637Display::clear()
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{
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uint8_t data[] = { 0, 0, 0, 0 };
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setSegments(data);
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}
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void TM1637Display::showNumberDec(int num, bool leading_zero, uint8_t length, uint8_t pos)
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{
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showNumberDecEx(num, 0, leading_zero, length, pos);
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}
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void TM1637Display::showNumberDecEx(int num, uint8_t dots, bool leading_zero,
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uint8_t length, uint8_t pos)
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{
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showNumberBaseEx(num < 0? -10 : 10, num < 0? -num : num, dots, leading_zero, length, pos);
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}
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void TM1637Display::showNumberHexEx(uint16_t num, uint8_t dots, bool leading_zero,
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uint8_t length, uint8_t pos)
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{
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showNumberBaseEx(16, num, dots, leading_zero, length, pos);
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}
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void TM1637Display::showNumberBaseEx(int8_t base, uint16_t num, uint8_t dots, bool leading_zero,
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uint8_t length, uint8_t pos)
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{
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bool negative = false;
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if (base < 0) {
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base = -base;
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negative = true;
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}
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uint8_t digits[4];
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if (num == 0 && !leading_zero) {
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// Singular case - take care separately
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for(uint8_t i = 0; i < (length-1); i++)
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digits[i] = 0;
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digits[length-1] = encodeDigit(0);
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}
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else {
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//uint8_t i = length-1;
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//if (negative) {
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// // Negative number, show the minus sign
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// digits[i] = minusSegments;
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// i--;
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//}
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for(int i = length-1; i >= 0; --i)
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{
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uint8_t digit = num % base;
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if (digit == 0 && num == 0 && leading_zero == false)
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// Leading zero is blank
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digits[i] = 0;
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else
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digits[i] = encodeDigit(digit);
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if (digit == 0 && num == 0 && negative) {
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digits[i] = minusSegments;
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negative = false;
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}
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num /= base;
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}
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}
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if(dots != 0)
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{
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showDots(dots, digits);
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}
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setSegments(digits, length, pos);
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}
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void TM1637Display::bitDelay()
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{
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delayMicroseconds(m_bitDelay);
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}
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void TM1637Display::start()
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{
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pinMode(m_pinDIO, OUTPUT);
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bitDelay();
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}
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void TM1637Display::stop()
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{
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pinMode(m_pinDIO, OUTPUT);
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bitDelay();
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pinMode(m_pinClk, INPUT);
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bitDelay();
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pinMode(m_pinDIO, INPUT);
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bitDelay();
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}
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bool TM1637Display::writeByte(uint8_t b)
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{
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uint8_t data = b;
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// 8 Data Bits
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for(uint8_t i = 0; i < 8; i++) {
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// CLK low
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pinMode(m_pinClk, OUTPUT);
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bitDelay();
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// Set data bit
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if (data & 0x01)
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pinMode(m_pinDIO, INPUT);
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else
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pinMode(m_pinDIO, OUTPUT);
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bitDelay();
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// CLK high
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pinMode(m_pinClk, INPUT);
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bitDelay();
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data = data >> 1;
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}
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// Wait for acknowledge
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// CLK to zero
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pinMode(m_pinClk, OUTPUT);
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pinMode(m_pinDIO, INPUT);
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bitDelay();
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// CLK to high
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pinMode(m_pinClk, INPUT);
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bitDelay();
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uint8_t ack = digitalRead(m_pinDIO);
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if (ack == 0)
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pinMode(m_pinDIO, OUTPUT);
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bitDelay();
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pinMode(m_pinClk, OUTPUT);
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bitDelay();
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return ack;
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}
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void TM1637Display::showDots(uint8_t dots, uint8_t* digits)
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{
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for(int i = 0; i < 4; ++i)
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{
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digits[i] |= (dots & 0x80);
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dots <<= 1;
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}
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}
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uint8_t TM1637Display::encodeDigit(uint8_t digit)
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{
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return digitToSegment[digit & 0x0f];
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}
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