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After lunch, Mao touched his stomach and met you again. Let's finish learning the previous article. If Mao speaks well, today he will be rewarded with Tao Mao to see a set of Big Ears pictures. Okay. Let's start learning now! This morning in our previous article "Linux arch/arm/mach-s3c2410/include/mach/gpio-nrs.h understanding" introduced a series of macros, but we do not know, why does the Linux kernel do this? This afternoon Mao will lead everyone
gpio_setbits (gpioc, gpio_pin_9); // pc9 output high-level for (I = 0; I Code engineering in my resources: Free http://download.csdn.net/detail/yx_l128125/4494861 available Step 1 declare the structure of gpio: Gpio_inittypedef gpio_initstructure; Step 2: assign values to the gpio_initstructure member. If you only set some of the Members, we need the following code: /*** Led1-> PC6, led2-> pc7, led3-> pc9 */ Gpio_initstructure.gpio_pin = gpio_pin_
Have done some works of the internet of things, because do not want to always do the app to control, because not everyone to download your own app, browser everyone is there, then everyone through the browser Web to access our server, it is not very simple and convenient, using Flask+python.Flask is a lightweight WEB application framework written in Python that is simple to use and easy to get started with.Install Flask:sudo apt-get install Python-pipsudo pip install flaskThen a simple server is
If you are developing your own board, you need to use the GPIO pin to control the 3G module boot/shutdown, the following article will be helpful to you, is the processor IMX6 and ZTE MG3732 module as an example.One, pin connectionThe processor's gpio3_gpio[9] connects the on/off (29) pin of the 3G module to control the power on/off of the 3G.Second, switch machine conditionsThe On/off pin is turned on continuously 2500~3500 milliseconds low, and the o
bus devices that communicate with each other,/the low level of the SS pin is the slave machine, on the contrary, the electrical flat height of the SS pin is the host. In an SPI communication system, a host is required. The SPI bus can be configured as single-master, single-master, and multi-slave, which are mutually master-slave. The SPI chip selection can be expanded to select 16 peripherals. In this case, the PCs output = NPCs, that is, npcs0 ~ 3 to 4-16 decoder. This decoder requires an ex
For push-pull output, open-drain output, reuse of Open-drain output, and reuse of push-pull output AndDifferences between upstream input, drop-down input, floating input, and analog input Reprinted from: http://bbs.ednchina.com/BLOG_ARTICLE_2082651.HTM Recently, when reading the Data Manual, I found that there are eight types of gpio configuration in the Cortex-M3: ( 1 ) Gpio_mode_ain Analog Input(2)Gpio_mode_in_floatingFloat Input (3)G
1. gpio introduction: Gpio (general-purpose input/output ports) is relative to the chip. If the corresponding chip has gpio pins, you can read these pins to obtain pin changes (I .e: changes in the level of the pin ). There are 117 I/O Ports in the S3C2410 chip, which are divided into ~ H. A total of 8 groups are GPA ~~ Gph. there are 130 I/O Ports in the S3C
I didn't want to add the following words. I sent a letter to the manager of the blog garden, explaining the reasons why the blog garden team removed my article and replied: there are too few people who know the technology and lack adequate introductions. I think they only do websites and do not know much about some things, so I would like to explain it here. This is the simplest knowledge in arm. It is a necessary process for learning arm. 1.What is gpio
The control of the LPC1788 universal IO port contains some basic components, such as setting push-pull output, open-drain output, pull-up resistors, and so on, which we'll look at today.First use Gpio to open Gpio's system clockLpc_sc->pconp |= (1Then we need to select the function of the pin we selected, some pins have several functions, through the register can choose aThe external resistor state of the relevant pin is then set Pinmode RegisterThen
Scenario Description: In compiling the kernel source code, the following problems appear:CHK Include/linux/version.hCHK include/linux/utsrelease.hSYMLINK Include/asm-Include/asm-x86Call scripts/checksyscalls.shCHK include/linux/compile.hCC DRIVERS/GPIO/BT8XXGPIO.OCc1:warnings being treated as errorsDRIVERS/GPIO/BT8XXGPIO.C: In the function ' Bt8xxgpio_remove ':drivers/g
Before learning I2C Drive, think about it should be a profound understanding of the I2C agreement. Personally feel that the best way to understand the I2C protocol is to practice, and the best practice is to use GPIO to simulate the I2C protocol test, intuitive and profound.First look at the I2C sequence diagram:According to the sequence diagram, the SDA and SCL can be simulated with two gpio respectively.
1. GPIO 1.1 IntroductionGPIO, General Purpose I/O, universal input/output interface, is the simplest digital input/output pin-As output can have two states: 0 and 1-as input, it receives the digital signal 1.2 function of the outside inputGpio can be used for input, output, or other special functionsThese functions are typically selected via the Register configuration pin feature-Input: The level of the pin can be determined by reading a register; If
#ifndef __sys_h#define__sys_h#include"stm32f10x.h"//bit band Operation//convert "bit with address + bit number" to alias address macro#defineBitband (addr, Bitnum) ((Addr 0xf0000000) +0x2000000+ ((addr 0xfffff) //convert the address into a pointer#defineMEM_ADDR (ADDR) * ((volatile unsigned long *) (ADDR))#defineBit_addr (ADDR, Bitnum) mem_addr (Bitband (ADDR, Bitnum))//GPIO Output Input address mapping#defineGPIOA_ODR_ADDR (GPIOA_BASE+12)//0x4001080
-level grounding at ordinary times, high-level output of single-chip microcomputer power supply voltage at ordinary times. In this way, the pull-up resistor is not connected. However, if the output end can be grounded, the output high level may lead to unstable single-chip microcomputer operation, or even burn out the pin; How to configure the I/O port used by the on-chip peripherals in stm32: First: 1. Configure the input clock and be activated (Enabled) after initialization ); 2. If you use th
------------------------------------------- Target: LCD screen driver and display. Understand the control method of gpio, and write a simple menu Test Program (including the display of colored Chinese characters and static pictures) -------------------------------------------- I. Glossary 1. What is a gpio port? What are the related resources in mini2440? A: 2.2416/2440 chip information on
Reprinted from: http://hi.baidu.com/%C9%B3%BC%D3%BB%C6%BD%F0%CA%A5%B6%B7%CA%BF/blog/item/026988d1a82d482e9b5027cd.html There is such a piece of code in mini2440_leds_misc.c. Throughout the c file, I feel like the real core code: S3c2410_gpio_setpin (led_table [I],! CMD ); The core of this sentence is s3c2410_gpio_setpin. Baidu has come to give a detailed explanation. It provides exceptionally powerful guidance on understanding the address ing of the 24x0 series Development Board in arm-Linux.
Reprint please indicate the source, thank you.Raspberry Pie provides the Python language implementation of the Gpio control pack, detailed description of the visible http://maxembedded.com/2014/07/using-raspberry-pi-gpio-using-python/#PinConfig. First in the system to open the terminal to perform Python check whether the Python and Python version is installed 2 or 3, this article uses the python3.4 implemen
Today, I am familiar with some gpio applications. The simplest is the control of LED lights. The following example uses L5 to describe it. Sysctlperipheralenable (sysctl_periph_gpiob); // enable gpio B Gpiopintypegpiooutput (gpio_portb_base, gpio_pin_0); // set pb0 output Another mode setting method is gpiodirmodeset (gpio_portb_base, gpio_pin_0, gpio_dir_mode_out). // multiple pins can be set in this mode.
Someone in the Forum said they wanted to get a car with the infrared control gpio and asked me how to get it. I wrote this post.I soldered four LEDs on the gpio port, representing the upper, lower, and lower layers.You can not only control gpio, but also execute any shell.It's not lirc, It's a lightweight infrared receiver I wrote.CBOs GM hasRunning method (Pleas
This section describes the simplest and most basic things. The ios operation of the cc2540 uses the Port port as the gpio. If you don't talk much about it, let's look at it. 1. Hardware Circuit The most simple hardware circuit is to use a gpio to control the LED light. Since gpio is used as the output, the gpio mode is
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