Jexus Chuang
another clone
Diff: DigitDisplay.cpp
- Revision:
- 0:d3173c8bfd48
- Child:
- 1:cae630b12d63
--- /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;
+}
+
+