adafruit gpio

This article was reproduced from: http://m.blog.csdn.net/kris_fei/article/details/69553422Platform:rockchipOs:android 6.0kernel:3.10.92Because the board does not have LCD can not know the SD card upgrade is completed, so use LED display.Control the Gpio output high-lit LEDs after the upgrade is complete in the recovery.system comes with Gpio control driver:The kernel has its own generic

Debug one of exynos4412-ARM embedded Linux-LEDS/GPIO drivers, exynos4412leds /****************************************** ***************************************@ Author's brother * @ version V1.0.0 * @ date 2016-02-19 **************************** **************************************** * ********** 1-led hardware Principle The Led circuit is relatively simple. Generally, a control circuit is built using a transistor. Shows the control circuit of two

Registration and Application for Linux GPIO, linuxgpio Registration and Application for Linux GPIO Linux Kernel, GPIO, ARM In Linux kernel code, GPIO is often used as a special signal, such as chip selection signal.We often use GPIO application functions, such as gpio_reques

Hardware Environment Development Board: NANOPI2 (cpu:a9 s5p4418) Software Environment Kernel version: linux3.4.39Cross-Compiler: ARM-LINUX-GCC version 4.9.3 (CTNG-1.21.0-229G-FA) 64-bit system version Linux3.4 kernel gpio driver Instructions Kernel 2.6.32 version above provides GPIO port managed library file/KERNEL/DRIVERS/GPIO/GPIOLIB.C. Related interfaces: 1.i

Linuxdebugfs you can use the sharing software to view the gpio status. adding debugfs to debugging can sometimes get twice the result with half the effort: adbshellmkdirdatadebugmount-tdebugfsdebugfsdatadebugcddatadebug check gpio status root @ android linux debugfs use sharing software to view gpio status add debugfs in debugging sometimes get twice the result w

The Linux development platform implements a generic Gpio driver that allows the user to control the output of the GPIO and read its input values through a shell or system call. Its properties files are in the/sys/class/gpio/directory, the directory has export and Unexport two properties files, the rest are connection files, such as GPIOCHIPN.Export file exports a

the system.The second parameter is the device name, which needs to match the device name that appears in the directory under the/dev/(/dev directory, the device name is generated from the command Unregister_chrdev (Mygpio_major, driver_name);Finally, the two modules are added to the kernel, which is completed by the last two lines of the program segment.static int __init mygpio_init (void){PRINTK ("GPIO init/n");Mygpio_major = Register_chrdev (0, dri

One, in the drive:1. When using the map port: Ioremap;#define Gpio_oft (x) ((x)-0x56000000)#define GPFCON (* (volatile unsigned long *) (Gpio_va + gpio_oft (0x56000050)))Gpio_va = Ioremap (0x56000000, 0x100000);//Physical Address 0x56000000, size of map area allocations 0x100000 bytesOnce this is mapped, the registers can be manipulated directly:　　Configuration 3 pin for output: Gpfcon = ~ (0x32));2. In the Linux/include/asm-arm/arch-s3c2410/map.h map, the linux/include/asm-arm/arch-s3c2410/ R

Blinky, button gpio examples using Python Contents [Hide] 1 Examples using Python 1.1 Blinky example 1.2 Button example 1.3 Gpio example Examples using Python The following application note covers the use of parameter um100's peripherals using python. sysfs method is used to access the gpio's. to create the interfaces for gp

DescriptionGpio map Relationship yx0--20 yx1--16 yx2--12 yx3--10 yx4--14 yx5--4 yx6--2 yx7--0Use cat mode to capture the level, if the character ' 1 ', means the input node is not closed, if the character ' 0 ', representing the external input node closed,1 Configuring Gpio[Email protected]:~ echo >/sys/class/gpio/export[Email protected]:~ echo >/sys/class/gpio/e

How to use IO in LinuxShould be a new version of the kernel method.Please refer to:./documentation/gpio.txt file The API provided:Drivers need to include #include Determine if an IO is legitimate: int gpio_is_valid (int number); Set the direction of the Gpio if the output is set at the same time:/* Set as input or output, returning 0 or negative errno * *int gpio_direction_input (unsigned gpio);int gpio_di

Based on the Barrierbreaker version, the description is based on the AR9331 AP121 demo veneer1. LampA. In mach-ap121.c, the definition of the gpio corresponding to the lamp is defined:#define Ap121_gpio_led_wlan0#define Ap121_gpio_led_usb1and defines the GPIO structure object for the lamp:static struct gpio_led ap121_leds_gpio[] __initdata = {{. Name= "Ap121:green:usb",.

1. Number of gpio groups:# Define 89c64xx_gpio_a_nr (8)# Define 89c64xx_gpio_ B _nr (7)# Define 89c64xx_gpio_c_nr (8)# Define 89c64xx_gpio_d_nr (5)# Define 89c64xx_gpio_e_nr (5)# Define 89c64xx_gpio_f_nr (16)# Define 89c64xx_gpio_g_nr (7)# Define 89c64xx_gpio_h_nr (10)# Define 89c64xx_gpio_ I _nr (16)# Define 89c64xx_gpio_j_nr (12)# Define 89c64xx_gpio_k_nr (16)# Define 89c64xx_gpio_l_nr (15)# Define 89c64xx_gpio_m_nr (6)# Define 89c64xx_gpio_n_nr (16

Video: Http://pan.baidu.com/s/1c06oitiThe initialization of the GPIO• Using the command "LS drivers/gpio/*.o" in the kernel source directory, you can see that "Gpio-exynos4" is compiled into the kernel– Generate the. o File represents the final compilation into the kernel– In addition to the Menuconfig configuration file, the. o file can also be used to determine

MTK Android Driver: GPIO, mtkgpio 1. parameter descriptions for each column:1.1.Def.Mode: indicates the initialization mode of the gpio module after startup. Each GPIO pin can have a maximum of seven modes, and MODE0 is always the GPIO mode. The mode of GPIO after system i

The s3c6410 Gpio pin is relatively much, and most of the pins have multi-function, how to use the simplest way to control the Gpio on Linux we need to look at the underlying code, in fact, there are many ways, Since the control of Gpio on the operating system side is not the same as controlling a traditional microcontroller.Here I'll mention a way to tell, and th

The last time I built the stm32 development platform in Linux, I used the official ST library. However, I personally felt that people were complicated and did not conform to my habits. I planned to encapsulate it, code later. ========================================================== ========================================== Personal Original, reprinted please indicate the source Http://blog.csdn.net/embbnux/article/details/18885277 The blogger has recently built his own blog on the computer a

0. PrefaceRaspberry Pi can be painless starter Linux, which controls the Raspberry Pi gpio through command and shell scripting. With this article you can familiarize yourself with multiple Linux commands and familiarize yourself with the shell scripting methods and have a basic understanding of IO redirection. I learned in the process of Raspberry Pi accumulated confidence, now feel that Linux is not so mysterious not so difficult, but full of endl

/************************************************************************** * i.mx6 AT24Cxx EEPROM Linu X I2c-gpio * Disclaimer: * Many times when we use the Linux system management hardware, more is through the chip controller, * but sometimes, we will also encounter the chip in the control is not enough, or in the design of the process of accidents, such as no * have thought controller exists, the content of this article is because For the fourth co

Raspberry Pi Raspberry the GpioRaspberry PI versions hardware schematic diagram: https://www.raspberrypi.org/documentation/hardware/raspberrypi/README.md configuration Two x 5v,3.3v output ports IO input/output voltage 0-3.3v Output PWM Support Two-way SPI bus Two-way IIC bus Serial port GPIO Python Library GPIO Zero library : https:/ /gpiozero.readthedocs.io/