A simple microcontroller program, everyone help

caigeqima

The data type you sent is not correct, you need to send hexadecimal. What you are sending now is the ASCLL code. ASCLL code 1, converted to hexadecimal is 0X31, that is, you say 0011 0001, the letter A is 0X41, which is 0100 0001

caigeqima

And your crystal oscillator must be 11.0592MHZ, otherwise it will not be allowed

linden99

The light-emitting diode you are talking about, is it an 8-segment LED, or does one pin correspond to a small light bulb? If it is led, you can't use p2 directly, it must be displayed according to the digital code. If one pin corresponds to a small light bulb, I can't test it. I have a 4-digit 8-segment led display calling subroutine. I am also debugging the serial port. It was OK to send a number, but now I want to make a protocol, and send a lot of data, there is a problem. The new board has not been adjusted yet.

pegarsus

It should be the crystal oscillator
I used the C8051F internal crystal oscillator with 0.3% error and the transceiver was abnormal.
Change to an 11.0592M and it's suddenly clear
Try it too