Linux pca9555. At power on, the I/Os are configured as inputs.
Linux pca9555 5k 阅读 The PCA9555 is identical to the PCA9535, except for the inclusion of the internal I/O pullup resistor, which pulls the I/O to a default high when configured as an input and undriven. x+fslc (4. gpio_base specific to the imx6? I placed in -1 as I saw in a post elsewhere but Sep 12, 2025 · 主板这侧通过I2c通讯协议，操作芯片（例如PCA9555、PCA9534之类）寄存器的值，由芯片控制其外接IO，这种芯片逻辑结构非常简单，有扩展8路IO、也有16路的，像某些主板或开发板都是通过类似信息扩展然后支持触摸屏等外设，内核挂载个驱动即可，因此，如果我们 This thread has been locked. We would like to show you a description here but the site won’t allow us. At power on, the I/Os are configured as inputs. My first question is can someone explain what to place in for . 他们使用PCA9555扫描键盘，在多次重新启动 (重新启动整个系统而不是每次初始化PCA9555)后，键盘扫描将出错。 原理图如下所示。 2. from a C user application). Currently I am taking the route of creating a device tree overlay file ( Jan 27, 2022 · 文章浏览阅读1. 1 原理图 2. （gpio-hog是一种提供自动gpio资源申请并且配置为gpio控制器驱动探测函数的一部分的机制） 2 Dec 13, 2022 · I currently attempting to implement the mma8452 driver for my mma8451Q accelerometer by adding it to the the Linux Device Tree. Is this handled in the linux interrupt handling code? Jan 10, 2013 · The PCA9555 is a 16-bit I/O expander that interfaces with the I2C bus. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and May 29, 2023 · 在 linux 下，不使用 pca9535 的 int 功能，直接使用系统源码可以吗 <think>好的，我现在要解决的问题是用户想在Linux下不使用PCA9535的中断功能，直接通过系统源码实现控制。首先，我需要理解用户的具体需求。用户之前询问过关于PCA9535的使用方法，现在希望绕过中断，直接通过轮询或其他的方式控制 . Device tree: + aliases { + i2c0 = &i2cddc; … I²C通信：PCA9555通过I²C总线与主控制器（如微处理器、微控制器等）进行通信。 地址格式：PCA9555的地址格式由8位组成。 其中，前4位是固定的，后3位（A2、A1、A0）则是由PCA9555的地址引脚决定的，用于在同一I²C总线上区分不同的PCA9555芯片。 Jun 20, 2025 · NCA9555/PCA9555代码 通用总线IO扩展器芯片驱动 原创 最新推荐文章于 2025-06-20 09:01:41 发布 · 1. 3w次，点赞12次，收藏60次。2022. I/O expanders Sep 6, 2024 · 文章浏览阅读2. org/nuttx/nuttx. 6内核中支持两种编写i2c驱动程序的方式 (这里所有内核版本为linux2. c中，pca9555_driver在i2c驱动注册时作为参数被调用。pca9555_data中除了定义leds、btns之外定义了互斥变量update_lock,在通过i2c总线读写设备时用到。 I2C设备的注册 在Linux2. ko- Say yes here to provide access to several register-oriented SMBus I/O expanders, made mostly by NXP or TI Jun 14, 2017 · Looking at the pca953x_irq_setup function in the source code for the pca9555 driver - I don't see anywhere that the #interrupt-cells property is handled. Mar 16, 2020 · linux内核如何为gpio 扩展芯片驱动添加设备节点？ 1. ) Excuse me, but I would like to ask if there is a sample source code for driving the PCA9555D. The GPIO pins can 尊敬的： 我们的客户在使用PCA9555时遇到两个问题，请帮助分析： 1. Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus. Mirror of https://bitbucket. nca9555 linux i2c driver. Aug 30, 2017 · I want to use the PCA9555 I2C I/O expander under Linux. System details: Linux xilinx-v2016. c ssd1306 Sep 11, 2025 · 扩展 IO pca95555 linux驱动 及使用 原创 最新推荐文章于 2025-09-11 15:38:44 发布 · 5. I have rev. Contribute to robbie-cao/nuttx development by creating an account on GitHub. The linux kernel is 2. e. 9. 1 Vivado and Devicetree xilinx-v2016. Aug 13, 2013 · Hello, I have problem with reading from my PCA9555 GPIO expander. INT引脚功能：当任何输入状态与其对应的状态不同时，PCA9555开漏中断 (INT)引脚输出（只对被配置为输入模式的引脚产生反应），用于向 单片机 指示输入状态已更改。 module模型 + i2c驱动注册 + 字符设备. TCA9555是一个I2C接口的16路IO扩展芯片。查阅 dirver/gpio 中的代码发现内核在 gpio-pca953x. c, so I add some code in pca953x. My first question is can someone explain w May 23, 2017 · 首先配置I2C内核驱动，将pca9555的源码built-in进入 (这里根据需要可能要配thermal的驱动)，然后在devicetree中根据pca9555硬件I2C地址配置节点。 Part Number: TCA9555 Other Parts Discussed in Thread: PCA9555 , Tool/software: Linux HI Like to know if i can use the linux driver for the PCA9555 for TCA9555 Nov 24, 2015 · Specifying GPIO Numbers for IO Expander in Linux Device Tree Asked 9 years, 11 months ago Modified 7 years, 6 months ago Viewed 8k times [Firefly-Linux] RK3568 pca9555芯片驱动详解 文章目录 一、PAC9555 介绍 二、ITX-3568JQ PAC9555 使用 2. CSDN桌面端登录微软首次发布 Microsoft Office 1990 年 11 月 19 日，微软首次发布 Microsoft Office。这一天，微软发布了 Windows 版本的 Microsoft Office，其中包含了文档处理工具 Word、表格处理工具 Excel，以及演示文档工具 PowerPoint，被后人合称“办公三件套”。 2178 Linux kernel source tree. c) and have some issues I hope someone could help me with. Linux kernel source tree. 6. May 23, 2018 · Hi, I'm trying to interface expander PCA9555 with IMX233. Contribute to zhangdexing/linux_driver_i2c development by creating an account on GitHub. If you have a related question, please click the "Ask a related question" button in the top right corner. yamlblob: 977b14db09b04b382a416fb394ac2316bd37e671 [file] [log] [blame] Contribute to OpenELEC/linux development by creating an account on GitHub. The PCA9555A contains the PCA9555 register set of four pairs of 8-bit Configuration, Input, Output, and Polarity Inversion registers. 1 board. The chip is supplied from 3. Nexperia GPIO expanders provide an elegant solution when additional IOs are needed while keeping the interconnections to a minimum, for example, in May 14, 2021 · 本文详细介绍了如何在Linux环境下使用I2C与PCA9555扩展GPIO进行通信。通过示例代码展示了如何打开I2C设备、设置地址、读写寄存器以及实现PCA9555的输入输出控制。同时，讨论了在同一I2C总线上操作多个设备时如何处理文件句柄的问题。 Jan 9, 2020 · Linux下Led&Button设备驱动PCA9555这两个结构体定义在驱动文件pca9555. The PCA9555 devices have 7 bit addresses 0100000 and 0100001. A more fully featured device, the PCAL9555A, is available with Agile I/O features. 5 V with interrupt and default pull-up resistors on GPIOs. 数据表中的待机电流消耗最大为1 uA，但他们测试的电流实际约为 gpio-pca95xx. It is designed for a wide voltage range of 2. May 1, 2020 · Hi Team, We have our customize design board mostly based on Colibri Evaluation board. 2 Here is the relevant device tree: The PCAL9555A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander with interrupt and weak pull-up resistors for I²C-bus/SMBus applications. c gpio-input-pca9555. The GPIO Expanders are bot I am trying to connect a Ti PCA9555 GPIO expander to a zynq-i2c controller and the expanders interrupt over zynq-gpio. 1 介绍 4. The PCA9555A is a pin-to-pin replacement to the PCA9555 and other industry-standard devices. 关注属性gpio-hog GPIO hogging is a mechanism providing automatic GPIO request and configuration as part of the gpio-controller's driver probe function. 3 驱动分析 The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I²C-bus I/O expanders. 28 51CTO博客已为您找到关于linux下i2c与pca9555通信的相关内容,包含IT学习相关文档代码介绍、相关教程视频课程,以及linux下i2c与pca9555通信问答内容。更多linux下i2c与pca9555通信相关解答可以来51CTO博客参与分享和学习,帮助广大IT技术人实现成长和进步。 T113 i2c gpio 拓展芯片xl9555开发应用笔记 参考资料 内核添加支持 设备树 引用 应用调用 在硬件信号上LCD_EN引脚高电平有效，而LCD_RST引脚是低电平有效，具体的引脚配置请参考 一节。需要注意的是AIO-3568J的dsi1中，LCD_EN: (PCA_IO0_7)使用的是PCA9555扩展芯片引出来的gpio，需要PCA9555 驱动起来以后才能控制该gpio。 * NXP - pca955x LED driver The PCA955x family of chips are I2C LED blinkers whose pins not used to control LEDs can be used as general purpose I/Os. 44-fslc+g8f876e153b25) Can anyone please tell me how to fix this problem? Thank you I2C_GPIO_Expander_Problem Jan 28, 2014 · I am trying to add three pca9555 i2c gpio expanders by adding them to my board file (board-mx6q_qmx6. I can easily control ports as outputs, but the problem is inputs. c: Arduino Library to approach PCA9555 I2C expander with digitalRead, digitalWrite and pinMode functions - nicoverduin/PCA9555 在介绍了Linux下Led&Button设备驱动的框架及整体设计之后，接下来进行详细设计 数据结构 点击 (此处)折叠或打开 struct pca9555_led { &nbs The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I²C-bus I/O expanders. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. 2 数据结构 4. How can I set this device as a correct gpio controller and configure it for gpio-buttons? Thanks for any useful information! CONFIG_GPIO_PCA953X -gpio-pca953x. 2w 阅读 Apr 7, 2023 · Part Number: PCA9555 Hello! I have some question about PCA9555 Implemented GPIO expansion I/F using PCA9555D. Files master bmp180_regmap pca9555 gpio-controler-pca953x. Chip works normaly. (I2C connection was made between STM32 MCU and PCA9555D. 所有寄存器都可由系统主控器读取。 芯片引脚及功能描述： PCA9555详细学习 1. nxp,pca9555 nxp,pca9556 nxp,pca9557 nxp,pca9574 nxp,pca9575 nxp,pca9698 nxp,pcal6416 nxp,pcal6524 nxp,pcal9535 nxp,pcal9555a maxim,max7310 maxim,max7312 maxim,max7313 maxim,max7315 ti,pca6107 ti,pca9536 ti,tca6408 ti,tca6416 ti,tca6424 ti,tca9539 ti,tca9554 onnn,cat9554 onnn,pca9654 exar,xra1202 - gpio-controller: if used as gpio expander. 3. Jan 21, 2014 · Hello, I am trying to add three pca9555 i2c gpio expanders by adding them to my board file (board-mx6q_qmx6. 27控制寄存器和命令寄存器，及英文理解一般8位作为地址，其中前四位时固定的，中间三位为地址配置，最后一位是读写位，即读是1，写是0当地址位，正确应答之后，主机会发送一个控制字节，控制字节将会存在PCA9555的控制寄存器中，其中三个字节 Part Number: TCA9539 Other Parts Discussed in Thread: DM3730, PCA9539, TCA8418E, TCA8418 Tool/software: Linux hi I am using two tca9539 device to have 20 input keys, The two devices is connected to dm3730 with i2c. It allows you to extend fnaf game the number of GPIO pins available on your Raspberry Pi by providing an additional 16 configurable digital inputs/outputs. 2 Here is the relevant device tree: Product data sheet General description The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. I've already enabled pca953x in the kernel config and added the below to the board file. using i2ctool,"i2cdetect" can see it in address (0x20) what i understand from data sheet of PCA9555 is that If I want to control the Port-Expander i set The register with the address 0x06 which will controls the direction (input/output) of all Port-0 pins and The register with the address 0x02 will Dec 22, 2021 · So, is there any way to give and initialize from fix GPIO_Base for each I2C expander, in simple words I want to give fix GPIO group to each IO expander? The IO expander I am using is PCA9555, and Linux kernel Version is 4. Feb 8, 2021 · I am trying to configure my Yocto Linux distro to setup two on-board I2C GPIO Expanders and document how to access them programmatically (i. Is this handled in the linux interrupt handling code? Mar 4, 2011 · So I have 2 PCA9555 (16 channel digital I/O) chips connected to a small embedded device running Linux over i2c. We have couple of PCA9555 connected with I2C bus (PIN_196/I2C_SCL, PIN_194/I2C_SDA). 3 V to 5. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. c 文件中提供了pca9555的驱动，而没有tca9555的驱动。 经过对比pca9555和tca9555的数据手册发现寄存器定义完全一直。可能是ti出品的就叫tca9555,nxp出品的就叫pca9555吧。 本仓库提供了一个用于驱动 CAT9555， PCA9555， XL9555 芯片的 C 语言库。这些芯片是常用的 I2C GPIO 扩展器，广泛应用于嵌入式系统和物联网设备中。通过本库，您可以轻松地控制这些芯片的输入输出引脚，实现对多个 GPIO 的扩展管理。 Dec 7, 2023 · 本文档介绍了如何在T113平台上使用PCA9555驱动进行XL9555 GPIO扩展芯片的开发应用，包括内核支持的添加、设备树配置以及应用级别的调用方法，详细阐述了GPIO扩展引脚的映射和控制方式。 PCA9555PW - The PCA9555 provides 16 bits of General Purpose Input/Output (GPIO) expansion for I²C-bus/SMBus applications. 3v rail from raspberry pi and connected to ground. Contribute to lx1570654507/nca9555 development by creating an account on GitHub. Contribute to torvalds/linux development by creating an account on GitHub. The newly created question will be automatically linked to this question. When I power up the b Product data sheet General description The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. 01. it uses a 16 bit memory address. I try to configure the Linux kernel for PCA9555 support (pca953x driver), but the option “Device drivers->GPIO Support” is missing. I configure it with May 3, 2020 · enter-button { label = "enter-button"; linux,code = <28>; /* ENTER */ gpios = <&gpio7 2 0>; }; }; But I cannot do it in a device tree because gpio-expander gpiochip7 is created just when pca9554 driver is loaded. 4k次。这篇博客详细介绍了如何在Linux系统下使用I2C与PCA9555进行通信，以及PCA9555的LED和Button设备驱动。文章涉及PCA9555的结构体定义、驱动注册、中断处理和设备注册流程，展示了如何通过i2c_register_board_info注册i2c_board_info，并在中断触发时调用button_key_event处理函数。 Oct 3, 2025 · - nxp,pca9555 - nxp,pca9556 - nxp,pca9557 - nxp,pca9574 - nxp,pca9575 - nxp,pca9698 - nxp,pcal6408 - nxp,pcal6416 - nxp,pcal6524 - nxp,pcal6534 - nxp,pcal9535 - nxp,pcal9554b - nxp,pcal9555a - onnn,cat9554 - onnn,pca9654 - ti,pca6107 - ti,pca9536 - ti,tca6408 - ti,tca6416 - ti,tca6418 - ti,tca6424 - ti,tca9535 - ti,tca9538 - ti,tca9539 - ti Dec 3, 2023 · 本文详细介绍了PAC9555 I/O扩展芯片的特性、在ITX-3568JQ主板上的使用情况，以及在RK3568平台的I2C总线和GPIO驱动。PAC9555通过I2C接口与主处理器通信，提供16个GPIO通道，并支持中断功能，广泛应用于家庭自动化、工业控制等领域。在设备树配置中，详细展示了如何配置和启用两个PAC9555芯片。 Jun 14, 2017 · Looking at the pca953x_irq_setup function in the source code for the pca9555 driver - I don't see anywhere that the #interrupt-cells property is handled. The PCA9555 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low operation) registers. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and Sep 17, 2023 · 5. 2 设备树 三、RK3568 I2C 介绍 四、PAC9555 驱动 4. However， the kernel only have driver pca953x. PCA95 [357]x, PCA9698, TCA64xx, and MAX7310 I/O ports found in drivers/gpio/Kconfig The configuration item CONFIG_GPIO_PCA953X: I am trying to connect a Ti PCA9555 GPIO expander to a zynq-i2c controller and the expanders interrupt over zynq-gpio. idmxhqvdmfjxpucmnwbtgxznnukkhmvwaienlittviddixupcsygwldyhowthtsinmphschgafyk