这样的SPI的bit-bang,优点是不需要SPI的控制器了,但是缺点很明显,除了要用户自己负责同步,timing等事情之外,相对来说,即使本身SPI设备支持以很高的频率运行,可以实现很好的性能,但是以bit-bang的方式去使用的话,实际性能往往很差。 最后,可以用一句话来解释,什么是SPI的bitbang/bit-bang: Use software to control ...
gpio-spi { status = "okay"; compatible = "spi-gpio"; #address-cells = <0x1>; ranges; gpio-sck = <&gpio0 14 1>; gpio-miso = <&gpio0 15 1>; gpio-mosi = <&gpio0 16 1>; cs-gpios = <&gpio0 17 1>; num-chipselects = <1>; /* clients */ spidev@1 { compatible = ...
The main FastLED library (successor to FastSPI_LED). Please direct questions/requests for advice to the g+ community - http://fastled.io/+ - we'd like to keep issues to just tracking bugs/enhancements/tasks. *NOTE* library work is currently on hold - s
I2S Peripheral in parallel mode (or RMT?) to send data to multiple (bitbang) SPI DACs 1 post • Page1of1 sysobln Posts:2 Joined:Mon Sep 28, 2020 6:55 am Postbysysobln»Mon Sep 28, 2020 7:02 am I'm working on a project where besides a I2S audio DAC on I2S0, I will need...
既然是worqueue,那么我们可以猜想,spi是在每一个work中实现bit bang的。 事实上确实如此,在/driver/spi/spi_bitbang.c#L267中,我们可以看到如下函数 static void bitbang_work(struct work_struct *work){}, 在/driver/spi/spi_bitbang.c中,我们可以发现 int spi_bitbang_start(struct spi_bitbang *bitbang);...
linux spi驱动架构FAQ 2011-10-27 13:49 −什么是SPI的bitbang/bit-bang: Use software to control serial communication at general-purpose I/O pins 通过GPIO引脚,用软件来模拟串行通信(SPI/I2C 。。。)。 对于多数情况来说,我们所用的SPI...
#ifndef __INC_FASTSPI_BITBANG_H #define __INC_FASTSPI_BITBANG_H #include "FastLED.h" #include "fastled_delay.h" FASTLED_NAMESPACE_BEGIN /// // // Software SPI (aka bit-banging) support - with aggressive optimizations for when the clock and data pin are on the same port // // TO...