I found a motherboard labeled as a shared bicycle control board on Xianyu. It was cheap, only 8 yuan, so I bought a few to play with. I haven't received the goods yet. I hope to learn some technologie...
I am using AT91RM9200, an ARM chip. Now I want to send AT commands to a GPRS module (gr64) through the serial port. I define a character array "AT" and write it to the serial port. It seems that there...
We know that PCI devices have three spaces: memory address space, IO address space and configuration space. Since PCI supports plug-and-play, PCI devices do not occupy a fixed memory address space or ...
Recently, the teacher asked me to make a minimum FPGA system. The minimum system uses JTAG debugging and downloading, and AS is used for fixed downloading. After it was completed, I found that JTAG ca...
Now we have a problem. The company's mainboard needs to control the relay output, and the relay controls the lights and other electrical appliances. Since energy-saving lamps are used on site, and ene...