// homework6.h
/*
 * this is the header file to
 * define the
 * variables:
 * - pins for the LEDs and the segs
 * - pins for the 38 transistors
 * - seg chars to display to display the number
 * functions:
 * - set the 38 transistors.
 */

#include <REG52.H>

// variables:
// pins for the LEDs and the segs
sbit BUS1A  = P2 ^ 0; // Red LED and A Seg
sbit BUS2B  = P2 ^ 1; // Orange LED and B Seg
sbit BUS3C  = P2 ^ 2; // Yellow LED and C Seg
sbit BUS4D  = P2 ^ 3; // Green LED and D Seg
sbit BUS5E  = P2 ^ 4; // Aqua LED and E Seg
sbit BUS6F  = P2 ^ 5; // BLUE LED and F Seg
sbit BUS7G  = P2 ^ 6; // Purple LED and G Seg
sbit BUS8DP = P2 ^ 7; // White LED and DP Seg
// pins for the 38 transistors
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
// seg chars to display to display the number
unsigned char code LedChar[] = {
    0xC0,
    0xF9,
    0XA4,
    0XB0,
    0X99,
    0X92,
    0X82,
    0XF8,
    0X80,
    0X90,
    0X88,
    0X83,
    0XC6,
    0XA1,
    0X86,
    0X8E,
};
// functions:
// 38 transistors control function
/*
 * param:
 * - addr: the address of the 38 transistors.
 * function:
 * - Convert the address to 3 binary numbers.
 * - Set the 38 transistors to the address.
 */
void set38(unsigned char addr)
{
    // Enable the 38 transistors.
    ENLED = 0;
    ADDR3 = 1;
    // Set the 38 transistors to the address.
    ADDR0 = addr & 0x01;
    ADDR1 = (addr & 0x02) >> 1;
    ADDR2 = (addr & 0x04) >> 2;
}