I can establish a UDP connection with the wap gateway. After sending a string of characters to the wap gateway, I cannot receive the data sent by the wap gateway. I use the revc function to receive th
Compile and link the generated files in CCS4.1 environment. See the attachment for the source code and project files.Give the ultrasonic module's Trig pin a high level of 10 us , use PIE interrupt to
I want to make a power indicator light circuit, but I find that what I made doesn't work. Conditions: power supply voltage +5V, red LED, NOR gate. Requirements: When the power supply is sufficient, th
I am now working on a program for switching between headphones and speakers. The operating system is Linux, and the CPU is an ARM9-based chip produced by our company. The detection of headphone insert
I am looking at Linux device drivers and find that I can't understand them. I don't know what knowledge I should have. Can an expert give me some advice on what books I should read to write drivers?