sudo apt install -y gpiod sudo gpioset 0 12=0 sudo gpiomon 0 12 # detect event on gpio12 gpiod由于比较新,用的人还非常少,虽说libgpiod里面有python封装,但还没有打包到debian stretch的仓库里面,所以用python ctypes封装了一份,在voice-engine/gpio-next,控制一个LED的python代码是这样: import time...
Here is an example output. I started gpio-int to watch GPIO 0. I waited around 12 seconds (4 timeout periods), then pressed the letter 'a' twice followed by enter key. Then I shorted the haywire to 3.3V that is accessible on pin 5 on the JTAG connector. JTAG pin 5 is across fro...
PCI host controller GPIO Controller 存在三个中断域; 一个以开放式pic节点为根,一个在PCI主桥节点,一个在GPIO Controller节点上 有两个nexus节点; 一个位于PCI主桥,一个位于GPIO控制器。 下面显示了具有PCI总线控制器和采样中断的设备片段 soc { compatible = "simple-bus"; #address-cells = ; #size-cells ...
Platforms whichuse the "gpiolib" implementors frameworkmay choose to configure a sysfs user interface to GPIOs.This is different from the debugfs interface, since it provides control over GPIO direction and value instead of just showing a gpio state summary. Plus, it could be present on producti...
GPIO pins should be named using the edge connector name (SODIMM on Colibri/Verdin and MXM3 on Apalis). That way, the user can easily identify and use GPIO pins by their names, instead of bank and number. The access could be done via libgpiod command-line tools: ...
6、GPIO控制器和GPIO使用情况7、clock控制器和clock使用情况 它基本就是一棵电路板上的CPU、总线、设备组成的树,Bootloader会将这棵树传递给内核,然后内核来识别这棵树,并根据它展开出Linux内核中的platform_device、i2c_client、spi_device等设备,而这些设备用到的内存、IRQ等资源,也被传递给内核,内核会将这些资源...
[导读]Linux内核是从V2.6开始引入设备树的概念,其起源于OF:OpenFirmware, 用于描述一个硬件平台的硬件资源信息,这些信息包括:CPU的数量和类别、内存基地址和大小、总线和桥、外设连接、中断控制器和中断使用情况、GPIO控制器和GPIO使用情况、Clock控制器和Clock使用情况等等。
clock-frequency = <400000>; fusb0: fusb30x@22 { compatible = "fairchild,fusb302"; reg = <0x22>; pinctrl-names = "default"; pinctrl-0 = <&fusb0_int>; int-n-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>; vbus-5v-gpios = <&gpio4 26 GPIO_ACTIVE_HIGH>; status = "okay"; }; ...
(s)startedinSVCmode.percpu:Embedded19pages/cpus45516r8192d24116u77824Built1zonelists,mobility grouping on. Total pages:130048Kernel command line:root=/dev/mmcblk0rwconsole=ttyAMA0printk: log_buf_len individual max cpu contribution:4096bytesprintk: log_buf_len total cpu_extra contributions:12288...
其实对于stm32f103改成stm32f429已经好很多了,最起码stm32f429的架构和stm32f407的架构大致相同(内部存储和时钟和gpio等略有不同),于是就按照自己手上的板子来改,期间遇到了不少的问题,也想过放弃,不过好歹坚持了下来,因为着急压力山大所以看了不少书,查了很多资料也学到了很多东西对u-boot和内核代码有了深入...