Mark Randall
This is a library for the JY-LKM1638 Display
Diff: LKM1638.cpp
- Revision:
- 0:c05022d4f68c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/LKM1638.cpp Mon Aug 19 17:09:38 2013 +0000
@@ -0,0 +1,345 @@
+
+#include "mbed.h"
+#include "LKM1638.h"
+
+
+const char READMODE = 0x42;
+const char INTENSITY = 0x00; //Intensity of LED and Seven Segment Displays (0-7)
+const int WAIT = 1;
+
+
+ //MPL3115A2 Class Constructor
+ LKM1636::LKM1636(PinName pin1, PinName pin2, PinName pin3) :_Strobe(pin1),_CLK(pin2),_Data(pin3)
+ {
+ _Data.mode(PullUp);
+
+ }
+
+
+//Driver Function that is used to write any printable char to the seven segment displays 0-7
+void LKM1636::displaychar (unsigned char value, unsigned char Seg_num, bool decimal) //Seg_num 0-7 ____,____
+{
+
+ unsigned char address;
+ unsigned char Seg_value=0;
+ address = 0xC0 + Seg_num * 2; //Base Address for Segments is 0xC0 Each segment uses to Bytes of Mem.
+ Seg_value = getchar(value);
+ if(decimal)
+ Seg_value = Seg_value | 0x80;
+ if(Seg_value<0xff) // If Seg_value == 0xFF then character was not recognized
+ {
+ _Strobe = 0;
+ SendChar(address);
+ SendChar(Seg_value);
+ _Strobe = 1;
+ Delay(WAIT);
+ _Strobe = 0;
+ SendChar(INTENSITY | 0x88);
+ _Strobe = 1;
+ }
+
+
+
+}
+
+
+//Prints a Long int to the 8 Seven Segment displays
+void LKM1636::Clear() //bank is either Seven Segs 0-3 Bank==0 or Segs 4-7 Bank==1
+ {
+ unsigned long temp1=0;
+
+ for(temp1=0;temp1<8;temp1++)
+ {
+ displaychar (' ',temp1,0);
+ }
+
+ }
+
+
+
+///Writes an 8bool number to either the first or second bank of 4 seven segment displays
+
+void LKM1636::Write_Short(unsigned char value, bool bank) //bank is either Seven Segs 0-3 Bank==0 or Segs 4-7 Bank==1
+ {
+ unsigned char temp=0;
+ unsigned char Seg_number = 0;
+ if(bank)
+ Seg_number = 5;
+ temp = value/100;
+ temp = temp%10;
+ displaychar (temp, Seg_number,0);
+ temp = value/10;
+ temp = temp%10;
+ displaychar (temp, Seg_number+1,0);
+ temp = value%10;
+ displaychar (temp, Seg_number+2,0);
+ }
+//Prints a Long int to the 8 Seven Segment displays
+void LKM1636::Write_Long(unsigned long int value) //bank is either Seven Segs 0-3 Bank==0 or Segs 4-7 Bank==1
+ {
+ unsigned long temp1=0;
+
+ temp1 = (value/10000000);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,0,0);
+
+ temp1 = (value/1000000);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,1,0);
+
+ temp1 = (value/100000);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,2,0);
+
+ temp1 = (value/10000);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,3,0);
+
+ temp1 = (value/1000);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,4,0);
+
+ temp1 =(value/100);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,5,0);
+
+ temp1 = (value/10);
+ temp1 = temp1%10;
+ displaychar ((unsigned char)temp1,6,0);
+
+ temp1 = (value%10);
+ displaychar ((unsigned char)temp1,7,0);
+ }
+
+// Serializes the Value passed into the character variable and send out using the data pin
+void LKM1636::SendChar(unsigned char Character)
+{
+ unsigned char t;
+ _CLK =1;
+ _Data.output();
+ Delay(WAIT);
+ for (t=0;t<8;t++) //Serialize Address and put out on Data Pin
+ {
+
+ _Data = (Character & 0x01);
+ Character = Character>>1;
+ ToggleClock ();
+ }
+ _Data.input();
+
+}
+/// Toggles the Clock pin low to high with a minimal delay between the toggle
+void LKM1636::ToggleClock ()
+{
+ _CLK = 0;
+ Delay(WAIT);
+ _CLK = 1;
+ Delay(WAIT);
+}
+/// Delay for Tick * Tocks of system clock
+///
+void LKM1636::Delay(unsigned int Tick)
+{
+ unsigned int tock=0,t=0;
+ for(t=0;t<Tick;t++)
+ {
+ for(tock=0;tock<10;tock++);
+ }
+
+}
+
+/// Getchar takes a integer value 0-15 or ascii value '0' - 'F'
+/// and returns the Seven Segment value needed to display the value
+
+unsigned char LKM1636::getchar(unsigned char value)
+{
+ int seg_value = 0;
+
+ switch(value)
+ {
+ case ('0'):
+ case (0):
+ seg_value = 0x3f;
+ break;
+ case ('1'):
+ case (1):
+ seg_value = 0x6;
+ break;
+ case ('2'):
+ case (2):
+ seg_value = 0x5b;
+ break;
+ case ('3'):
+ case (3):
+ seg_value = 0x4f;
+ break;
+ case ('4'):
+ case (4):
+ seg_value = 0x66;
+ break;
+ case ('5'):
+ case (5):
+ seg_value = 0x6d;
+ break;
+ case ('6'):
+ case (6):
+ seg_value = 0x7d;
+ break;
+ case ('7'):
+ case (7):
+ seg_value = 0x7;
+ break;
+ case ('8'):
+ case (8):
+ seg_value = 0x7f;
+ break;
+ case ('9'):
+ case (9):
+ seg_value = 0x6f;
+ break;
+ case ('A'):
+ case ('a'):
+ case (10):
+ seg_value = 0x77;
+ break;
+ case ('B'):
+ case ('b'):
+ case (11):
+ seg_value = 0x7c;
+ break;
+ case ('C'):
+ case ('c'):
+ case (12):
+ seg_value = 0x39;
+ break;
+ case ('D'):
+ case ('d'):
+ case (13):
+ seg_value = 0x5e;
+ break;
+ case ('E'):
+ case ('e'):
+ case (14):
+ seg_value = 0x79;
+ break;
+ case ('F'):
+ case ('f'):
+ case (15):
+ seg_value = 0x71;
+ break;
+ case ('.'):
+ seg_value = 0x80;
+ break;
+ case ('-'):
+ seg_value = 0x40;
+ break;
+ case (' '):
+ seg_value =0x0;
+ break;
+ default :
+ seg_value = 0xff;
+ break;
+
+ }
+ return (seg_value);
+}
+
+//Reads the current state of all 8 input buttons. The state of each button is returned as an 8bool value
+//the bool to Sw map:
+//Switch bool order bool# 7 6 5 4 3 2 1 0 //0x80 0x20 0x08 0x02 || 0x40 0x10 0x04 0x01
+// Sw# 1 5 2 6 3 7 4 8
+
+unsigned char LKM1636::read_buttons ()
+{
+ unsigned char temp=0;
+ char d=0;
+ _Strobe = 0;
+ SendChar(READMODE);
+ //_Data = 1;
+ _CLK = 1;
+ Delay(WAIT);
+ for(d=0;d<32;d++)
+ {
+ if(!((d-1)%4))
+ {
+ temp=temp<<1;
+ if(_Data)
+ temp+=1;
+ }
+ ToggleClock ();
+ }
+ _Strobe = 1;
+ return temp;
+}
+
+//Takes the 8bool number returned from the read_buttons function and lights the corsponing LED to current switch posistion
+void LKM1636::Switch_To_LED(unsigned char Switch_Values)
+{
+ unsigned char t=0;
+ bool temp_state=0;
+ for(t=0; t<8; t++)
+ {
+ temp_state = (Switch_Values & 0x01);
+ Switch_Values= Switch_Values>>1;
+ switch (t)
+ {
+ case (0):
+ LED (7, temp_state);
+ break;
+ case (1):
+ LED (3, temp_state);
+ break;
+ case (2):
+ LED (6, temp_state);
+ break;
+ case (3):
+ LED (2, temp_state);
+ break;
+ case (4):
+ LED (5, temp_state);
+ break;
+ case (5):
+ LED (1, temp_state);
+ break;
+ case (6):
+ LED (4, temp_state);
+ break;
+ case (7):
+ LED (0, temp_state);
+ break;
+ default:
+ break;
+ }
+
+ }
+}
+
+//LED_Num (0-7)) corsponds to the LED that is to be written to state(1=led on, 0 = led off)
+void LKM1636::LED (unsigned char LED_Num, bool state)//intensity can range from 0-7
+{
+ unsigned char LED_Address;
+ LED_Address = 0xC0 + (LED_Num*2) + 1; //LED are at odd address 1 to 15;
+ _Strobe = 0;
+ SendChar(LED_Address);
+ if(state)
+ SendChar(0x01);
+ else
+ SendChar(0x00);
+ _Strobe = 1;
+ Delay(WAIT);
+ _Strobe = 0;
+ SendChar(INTENSITY | 0x88);
+ _Strobe = 1;
+}
+//Takes a 8bool number and writes out the value to the 8 leds (0-7)
+void LKM1636::LEDS (unsigned char LED_Values)
+{
+ unsigned char temp;
+ bool temp_state = 0 ;
+ for(temp=0; temp<8; temp++)
+ {
+ temp_state = (LED_Values & 0x01);
+ LED (temp, temp_state);
+ LED_Values= LED_Values>>1;
+ }
+}