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747b75b Jan 28, 2018
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@avishorp @mcauser @Kasoo
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// Author: avishorp@gmail.com
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
extern "C" {
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
}
#include <TM1637Display.h>
#include <Arduino.h>
#define TM1637_I2C_COMM1 0x40
#define TM1637_I2C_COMM2 0xC0
#define TM1637_I2C_COMM3 0x80
//
// A
// ---
// F | | B
// -G-
// E | | C
// ---
// D
const uint8_t digitToSegment[] = {
// XGFEDCBA
0b00111111, // 0
0b00000110, // 1
0b01011011, // 2
0b01001111, // 3
0b01100110, // 4
0b01101101, // 5
0b01111101, // 6
0b00000111, // 7
0b01111111, // 8
0b01101111, // 9
0b01110111, // A
0b01111100, // b
0b00111001, // C
0b01011110, // d
0b01111001, // E
0b01110001 // F
};
TM1637Display::TM1637Display(uint8_t pinClk, uint8_t pinDIO)
{
// Copy the pin numbers
m_pinClk = pinClk;
m_pinDIO = pinDIO;
// Set the pin direction and default value.
// Both pins are set as inputs, allowing the pull-up resistors to pull them up
pinMode(m_pinClk, INPUT);
pinMode(m_pinDIO,INPUT);
digitalWrite(m_pinClk, LOW);
digitalWrite(m_pinDIO, LOW);
}
void TM1637Display::setBrightness(uint8_t brightness, bool on)
{
m_brightness = (brightness & 0x7) | (on? 0x08 : 0x00);
}
void TM1637Display::setSegments(const uint8_t segments[], uint8_t length, uint8_t pos)
{
// Write COMM1
start();
writeByte(TM1637_I2C_COMM1);
stop();
// Write COMM2 + first digit address
start();
writeByte(TM1637_I2C_COMM2 + (pos & 0x03));
// Write the data bytes
for (uint8_t k=0; k < length; k++)
writeByte(segments[k]);
stop();
// Write COMM3 + brightness
start();
writeByte(TM1637_I2C_COMM3 + (m_brightness & 0x0f));
stop();
}
void TM1637Display::showNumberDec(int num, bool leading_zero, uint8_t length, uint8_t pos)
{
showNumberDecEx(num, 0, leading_zero, length, pos);
}
void TM1637Display::showNumberDecEx(int num, uint8_t dots, bool leading_zero,
uint8_t length, uint8_t pos)
{
uint8_t digits[4];
const static int divisors[] = { 1, 10, 100, 1000 };
bool leading = true;
for(int8_t k = 0; k < 4; k++) {
int divisor = divisors[4 - 1 - k];
int d = num / divisor;
uint8_t digit = 0;
if (d == 0) {
if (leading_zero || !leading || (k == 3))
digit = encodeDigit(d);
else
digit = 0;
}
else {
digit = encodeDigit(d);
num -= d * divisor;
leading = false;
}
// Add the decimal point/colon to the digit
digit |= (dots & 0x80);
dots <<= 1;
digits[k] = digit;
}
setSegments(digits + (4 - length), length, pos);
}
void TM1637Display::bitDelay()
{
delayMicroseconds(100);
}
void TM1637Display::start()
{
pinMode(m_pinDIO, OUTPUT);
bitDelay();
}
void TM1637Display::stop()
{
pinMode(m_pinDIO, OUTPUT);
bitDelay();
pinMode(m_pinClk, INPUT);
bitDelay();
pinMode(m_pinDIO, INPUT);
bitDelay();
}
bool TM1637Display::writeByte(uint8_t b)
{
uint8_t data = b;
// 8 Data Bits
for(uint8_t i = 0; i < 8; i++) {
// CLK low
pinMode(m_pinClk, OUTPUT);
bitDelay();
// Set data bit
if (data & 0x01)
pinMode(m_pinDIO, INPUT);
else
pinMode(m_pinDIO, OUTPUT);
bitDelay();
// CLK high
pinMode(m_pinClk, INPUT);
bitDelay();
data = data >> 1;
}
// Wait for acknowledge
// CLK to zero
pinMode(m_pinClk, OUTPUT);
pinMode(m_pinDIO, INPUT);
bitDelay();
// CLK to high
pinMode(m_pinClk, INPUT);
bitDelay();
uint8_t ack = digitalRead(m_pinDIO);
if (ack == 0)
pinMode(m_pinDIO, OUTPUT);
bitDelay();
pinMode(m_pinClk, OUTPUT);
bitDelay();
return ack;
}
uint8_t TM1637Display::encodeDigit(uint8_t digit)
{
return digitToSegment[digit & 0x0f];
}