bitbang

最新推荐文章于 2025-03-11 11:28:52 发布

eeblacksmith

最新推荐文章于 2025-03-11 11:28:52 发布

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分类专栏： Linux内核文章标签： bitbang

本文链接：https://blog.youkuaiyun.com/jackjones_008/article/details/52062286

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Bit-banging是一种使用通用I/O线路模拟串行端口的方法。与微控制器内置的SPI和I2C模块自动处理同步和时序信号不同，bit-banging需要用户手动控制每个端口引脚的正确转换次数和时序要求。尽管实际端口速度可能很高，但由于软件上的开销，实际的位bang吞吐率通常很低，但在通信开销可接受的应用场景中，例如偶尔的控制通信，这种方法可能是可以接受的。

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之前看过linux下的SPI bitbang驱动, 但是当时没弄明白为什么叫bitbang. 以下是一些google的信息.

WhatIs Bit-Banging?

Bit-bangingis a method of using general-purpose I/O lines to emulate a serial port.Microcontrollers that include serial-port modules like SPI[tm] and I2C[tm]manage all synchronization and timing signals, and this activity is transparentto the user. With bit-banging, however, each write to the port causes a singletransition at the port pin. And it's up to the user, first, to provide thecorrect number of transitions to obtain the desired waveform and, second, toensure that the timing requirements (particularly setup and hold times forreading and writing data) are met. Due to the overhead associated with thenumber of writes to the port, though the actual port speed might be quite highthe actual bit-bang throughput rate is usually very slow. This technique isvery inefficient from a software perspective, but it may be acceptable in someapplications where the communication overhead is acceptable (for example fordoing occasional controlling communication).

http://www.epanorama.net/links/serialbus.html