The Raspberry Pi is a powerful computer in a compact form factor, making it highly useful for all manner of projects. However, it lacks some of the IO capabilities you might find on a common ...

1.什么是DMA，有什么作用？ DMA用于在外设与存储器之间以及存储器与存储器之间提供高速数据传输。可以在无需任何 CPU 操作的情况下通过 DMA 快速移动数据。这样节省的 CPU 资源可供其它操作使用。 我们用一个现实例子来做个类比。有一家冶炼公司，每天要不断 ...