archieve: homework5 header: basic functions

homework5/src/homework5.h

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+// homework5.h
+/*
+ * this header defines:
+ * 1. pin numbers to control the LED and the Seg.
+ * 2. the function to control the LED and the Seg.
+ * 3. the function to display the number on the Seg.
+ * 4. the function to set the 38 transistors.
+ */
+
+#include <REG52.H>
+
+// variables:
+// pin numbers:
+sbit BUS1A  = P2 ^ 0; // BUS1A: BUS for the LED1(RED) and the Seg A.
+sbit BUS2B  = P2 ^ 1; // BUS2B: BUS for the LED2(ORANGE) and the Seg B.
+sbit BUS3C  = P2 ^ 2; // BUS3C: BUS for the LED3(YELLOW) and the Seg C.
+sbit BUS4D  = P2 ^ 3; // BUS4D: BUS for the LED4(GREEN) and the Seg D.
+sbit BUS5E  = P2 ^ 4; // BUS5E: BUS for the LED5(AQUA) and the Seg E.
+sbit BUS6F  = P2 ^ 5; // BUS6F: BUS for the LED6(BLUE) and the Seg F.
+sbit BUS7G  = P2 ^ 6; // BUS7G: BUS for the LED7(PURPLE) and the Seg G.
+sbit BUS8DP = P2 ^ 7; // BUS8DP: BUS for the LED8(WHITE) and the Seg DP.
+// 38 transistors controller:
+sbit ADDR0 = P1 ^ 0; // to A(A0)
+sbit ADDR1 = P1 ^ 1; // to B(A1)
+sbit ADDR2 = P1 ^ 2; // to C(A2)
+sbit ADDR3 = P1 ^ 3; // to E1
+sbit ENLED = P1 ^ 4; // to E2 & E3
+
+// functions:
+// 38 transistors controller:
+void set38Transistors(unsigned char number) // set the 38 transistors.
+{
+    // turn on the 38 transistors:
+    ENLED = 0;
+    ADDR3 = 1;
+    // split the number into 3 binary numbers:
+    ADDR2 = (number & 0x04) >> 2;
+    ADDR1 = (number & 0x02) >> 1;
+    ADDR0 = (number & 0x01);
+}