The port P5.2 of the 149 I'm using is disconnected from the soldering pad. I wonder if it will be a problem if I leave it floating, because I can't solder it on!Thank you!
Download the code of libusb-0.1.12, first compile libusb on the PC, then compile your own code, run, everything is normal, no exceptions. Then cross compile, after completion, cross compile your own p
Now use the SPI port to read the information of the external SPI-Flash. First, set the SPI function of IO in raspi-config, just like the previous I2C setting, see [url]https://en.eeworld.com/bbs/threa
The problem I encountered is very strange. The same program on two boards can send and receive normally, but they cannot switch. The sending board can only send, not receive, but it can receive after