RT, I use the MCLK of 16M crystal oscillator, and the timer captures the pulse width. I found that the minimum pulse width can only be measured to about 2us. I don't know if there is a problem with my
[p=25, null, left][color=#000][font=sans-serif][b]Phenomenon 1: The PCB design requirements for this board are not high, so use thinner wires and do automatic routing. [/b][/font][/color][/p] [p=25, n
I am currently using a Falcom A2D-1 GSM module, and I use the module's own host software to connect directly to the PC's serial port: I can make calls, receive calls, send text messages, and receive t