i2c voltmeter

　Bus driver4.1 OverviewThe I²C bus driver is the software implementation of the I²C adapter, which provides the ability of the I²C adapter to complete data communication from the device, such as start, stop, response signal and master_xfer implementation function.The I²C bus driver is described by I2c_adapter and I2c_algorithm.Hardware description of the 4.2 S3C2440I2C controllerThe s3c2440 processor incorporates an I²C controller with four registers for control:Iiccon i²c Control RegisterIicsta

Tags: blog HTTP use strong SP data on log BS The I2C (Inter-Integrated Circuit) bus is a two-line serial bus developed by Philips to connect the microcontroller and its peripheral devices. The I2C bus was originally developed for audio and video devices in 1980s and is now mainly used in server management, including communication in the status of a single component. For example, the administrator can quer

Learning points: 1. Driver entry point, at which stage is loaded, and how to adjust the sequence of driver loading; 2. How are devices and drivers associated; 3. I2C bus operation, I2C protocol; 4. Power Management, including power application, power on, and standby processing; 5. input device registration and event reporting; 6. multi-touch device events and parameters; 7. Adjust the direction; 1. First,

call the device_add () function,After registering OK, the directory/sys/devices/platform/power will also appear. It will also be added to dpm_list.The I2C controller peripheral represents a device registered on the platform bus, that is, its parent device is platform.Finally, in platform_device_add (), the device_add () function is called to add the device/A power directory appears in the mt6516-i2c.1/mt65

Debugging touchpanel has been around for a while. Today, the platform is msm7x27, android2.2, and TP is mainly I2C. I2C is not introduced here, but self-search is unclear, this article mainly introduces the content of TP porting on this platform. Note that the platform uses hardware I2C instead of gpio simulation. 1. File nodes of devices and drivers The device i

I2c4_sda/gpio7_c1 Gpio7c1 I2c4tp_sda I2c4_scl/gpio7_c2 Gpio7c2 I2c4tp_scl In the/kernel/arch/arm/boot/dts/rk3288.dtsi there are:I2C4: [email protected] {compatible = "ROCKCHIP,RK30-I2C"; reg = Here, the property associated with the multiplexing control is pinctrl-: Pinctrl-names defines a list of state names: Default (I²c function) and Gpio two states. Pinctrl-0 defines the PIN

with a I2C device driver. We analyze (at24_driver), the members of the inside, the more important members have 2, one is the probe function, the other is At24_ids, which holds the ID list of support AT24 devices, such as AT24C02,AT24C08, etc. Interested can look at this table. We then analyze the probe function. This function is very long, if you want to read every line of code is certainly very difficult, we should be the most basic grasp of the

Recent Debugging I2C Drive (Pca9544,pcf8574,pi3. Encountered a lot of problems, not timely record, also did not tidy up, the first to solve the problem recorded. 1, the I2C adapter driver and the device-driven resource information in the Board file registration; 2, and then add the drivers to the kernel to compile; 3, compiled kernel image on the board run, the drive are normal. However, after loading the

A device driver is used as a translation between hardware and the application that uses hardware (user code) or the kernel, which hides the details of the hardware's work behind the scenes, thereby simplifying programming. Programmers can use a set of standardized invocation methods (system calls) to write advanced application code without having to care about the specific hardware it will control or the processor on which it is running. With a well-defined internal application programming inter

{f}{l}$, if the test charge is not affected by the electric field force, there must be no electric field hereD by B=$\frac{f}{il}$, if a small part of the energized conductor is not subjected to magnetic field force, it is stated that there must be no magnetic field here.2., the power supply electromotive force is E, the internal resistance is R, the DC motor M resistance is R, when the motor is working normally, the ideal voltmeter reading is U, then

System: Fedora Core4 Kernel: 2.6.11.1 Error occurred: 1, CC DRIVERS/I2C/I2C-CORE.OIn the file included from drivers/i2c/i2c-core.c:29:Include/linux/i2c.h:58:error:array type has incomplete element typeInclude/linux/i2c.h:197:error:array type has incomplete element typedrivers/i2c