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;
+}
+
+