Diff: SeeedFourDigitDisp.h

Revision:

7:b16b9733d859

Child:

12:a16d86fac131

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SeeedFourDigitDisp.h	Fri Apr 21 07:34:25 2017 -0600
@@ -0,0 +1,122 @@
+#ifndef SEEED_FOUR_DIGIT_DISP_H
+#define SEEED_FOUR_DIGIT_DISP_H
+#include "mbed.h"
+
+class SeeedFourDigitDisp {
+  private:
+    int digitTable_[17];
+    static const int onByte_ = 0x88;
+    static const int fixedAddrByte_ = 0x44;
+    static const int positionBit_ = 0xc0;
+    static const int nullDigit_ = 16;
+    static const int colonBit_ = 0x80;
+    void start_cmd();
+    void stop_cmd();
+    DigitalOut datPin_;
+    DigitalOut clkPin_;
+    void pin_delay(int delay_us = 1);
+    void send_byte(int byte);
+  public:
+    int brightness;
+    bool colonFlag;
+    void set_digit(int pos, int digit);
+    void set_integer(int value);
+    void clear_display();
+    void turn_on();
+    SeeedFourDigitDisp (PinName dataOut, PinName clockOut);
+};
+
+SeeedFourDigitDisp::SeeedFourDigitDisp(PinName dataOut, PinName clockOut) : datPin_(dataOut), clkPin_(clockOut) {
+    brightness = 7;
+    colonFlag = false;
+    const int digits[] = {0x3f, 0x06, 0x5b, 0x4f,
+                          0x66, 0x6d, 0x7d, 0x07,
+                          0x7f, 0x6f, 0x77, 0x7c,
+                          0x39, 0x5e, 0x79, 0x71,
+                          0x00
+                         }; //0~9,A,b,C,d,E,F,null
+    for (int i = 0; i < 17; i++) {
+        digitTable_[i] = digits[i];
+    }
+    clear_display();
+}
+
+void SeeedFourDigitDisp::start_cmd() {
+    datPin_ = 0;
+}
+
+void SeeedFourDigitDisp::stop_cmd() {
+    clkPin_ = 0;
+    datPin_ = 0;
+    pin_delay();
+    clkPin_ = 1;
+    datPin_ = 1;
+}
+
+void SeeedFourDigitDisp::clear_display() {
+    set_digit(0,nullDigit_);
+    set_digit(1,nullDigit_);
+    set_digit(2,nullDigit_);
+    set_digit(3,nullDigit_);
+}
+
+void SeeedFourDigitDisp::set_digit(int pos, int digit) {
+    int flaggedDigit = digitTable_[digit] | (colonFlag ? colonBit_ : 0);
+    start_cmd();          //start signal sent to TM1637 from MCU
+    send_byte(fixedAddrByte_);
+    stop_cmd();
+    start_cmd();
+    send_byte(pos|positionBit_);
+    send_byte(flaggedDigit);
+    stop_cmd();
+    start_cmd();
+    send_byte(onByte_ + brightness);
+    stop_cmd();
+
+}
+
+void SeeedFourDigitDisp::set_integer(int value) {
+    clear_display();
+    if( value < 0 ) {
+        colonFlag = true;
+        set_digit(0, 0);
+        return;
+    }
+    if( value > 9999 ) {
+        colonFlag = true;
+        set_digit(0, 15);
+        return;
+    }
+    for (int i = 3; i >= 0; --i) {
+        int digit = value % 10;
+        set_digit(i, digit);
+        value -= digit;
+        if(value < 10) return;
+        value /= 10;
+    }
+}
+
+void SeeedFourDigitDisp::turn_on() {
+    start_cmd();
+    send_byte(onByte_+brightness);
+    stop_cmd();
+}
+
+void SeeedFourDigitDisp::pin_delay(int delay_us) {
+    wait_us(delay_us);
+}
+
+void SeeedFourDigitDisp::send_byte(int byte) {
+    byte |= 0x100; // bring data high for ack after 8 bits
+    for (uint8_t i = 0; i < 9; i++) {
+        pin_delay();
+        clkPin_ = 0;
+        pin_delay();
+        datPin_ = byte & 1;
+        pin_delay();
+        byte >>= 1;
+        clkPin_ = 1;
+    }
+}
+
+#endif