Recommended introductory tutorial for ARM embedded Linux system development, "ARM Embedded Linux System Development" video tutorial, 40 episodes in total, author Gong Lei
[size=4](1) The RC oscillator circuit has a simple structure, is easy to adjust, and is economical and reliable. [/size] [size=4] [/size] [size=4](2) The oscillation frequency of the RC oscillator cir
1. Experimental Task As shown in the figure above, two common cathode digital tubes are connected to the P0 and P2 ports of the AT89S51 microcontroller respectively. The P0 port drives the tens digi
[i=s]This post was last edited by Li Baiyi on 2021-12-22 21:11[/i]1 Test baud rate
AT
2 Turn off echo
ATE0
3 Check whether the SIM card is normal. If it returns to normal, go to the next step
AT+ECICC