// test1.c
// 通过定时器实现以0.5Hz的频率闪烁一个小灯
#include "homework4.h"

unsigned char cnt = 0; // log timer T0 overflow counts

void test1()
{
    set_38_2LED();
    TMOD = 0x01; // timer T0 mode 1, 16-bit timer
    TH0  = 0XB8;
    TL0  = 0X00;
    TR0  = 1; // timer T0 run
    while (1) {
        if (TF0 == 1) { // timer T0 overflow
            TF0 = 0;    // clear timer T0 overflow flag
            TH0 = 0xB8; // reload timer T0 value
            TL0 = 0x00;
            cnt++; // log timer T0 overflow counts
            if (cnt >= 50) {
                cnt   = 0;      // clear log timer T0 overflow counts
                BUS1A = ~BUS1A; // toggle LED
            }
        }
    }
}
void main()
{
    test1();
}