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?...
As the title says, I recently made a small program on MC1000. After doing it, I felt that the screen was too dark, so I wanted to change the contrast. I wanted to make a registry file myself, but I do...
I defined two assembly functions in a file, but when compiling, it says that it does not recognize the first InvalidateTLBs(); Why is this? asm void InvalidateTLBs() { addi r5,0,32 mtspr CTR,r5 } asm ...
I tried the mouse mode in HID. You just need to uncomment the last line in the boot.py file, [code]pyb.usb_mode('CDC+HID') # act as a serial device and a mouse[/code] to change the USB confirmation me...