Description: Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?
To Search:
- [first1] - Plotted using the GDI function, the basi
- [first3] - Use opengl function to write a console p
File list (Check if you may need any files):
堪称一绝的“IO 口扫键”法.pdf
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