Novice to MCU. I use stc89c52 single-chip microcomputer to make running water lamps, which can be used on the Huijing HL-1 development board. But none of the lights on the circuit I soldered was on. I use 8 LED lights to connect the positive pole to vcc, and the negative pole to p1.0 to p1.7. The crystal oscillator circuit is soldered. I beg the boss to tell me the reason. I have been worried for several days. Attach the running water light program.
Rolando Posted on March 5, 2021
Looked, the code is ok, it should be a hardware failure.
Dale Posted on March 5, 2021
1. Whether the positive and negative poles of the LED are connected reversely, and whether the LED is damaged;
Second, is there a current-limiting resistor connected to the LED, if not, it is easy to burn the MCU pins;
3. Is the reset circuit soldered?
Lennox Posted on March 5, 2021
The program is correct, an obvious hardware error.
Winston Posted on March 5, 2021
A typical hardware error is that the host reverses the polarity of the diode, and the other is that no resistor is added.