i2c oscilloscope

I. About I2C The I2C (Inter-Integrated Circuit) bus is a two-line serial bus developed by Philips to connect the microcontroller and its peripheral devices. The main advantage of I2C bus is its simplicity and effectiveness. The simplicity is embodied in the simple wiring. There are only two lines of data cable (SCL) and clock line (SDA), and the control is simpl

The latest due to the project needs, debugging s5pv210 Development Board Linux system above the audio function, we choose the audio codec chip is WM8960, connected to the CPU of the IIS interface, debugging process encountered a series of problems, summarized as follows: Debug WM8960 so that it can play audio, clock configuration is a very important part of the first we need to determine whether the clock is configured correctly. After Linux startup, use the

as: whether the chip is consistent; whether there is virtual soldering, find an oscilloscope and check if the I2C waveform is abnormal!5. After completing the above work, it does not mean that you have completed all the work. Now, although the sensor has started to work, when you enter the gravity sensing interface, such as system settings.I found that the UI does not rotate at present, or that the next se

/event4: 0003 0002 000003e2/Dev/input/event4: 0000 0000 00000000/Dev/input/event4: 0003 0000 00000002/Dev/input/event4: 0003 0001 ffffff5d/Dev/input/event4: 0003 0002 000003e5/Dev/input/event4: 0000 0000 00000000/Dev/input/event4: 0003 0000 00000001/Dev/input/event4: 0003 0001 ffffff5f/Dev/input/event4: 0003 0002 000003df/Dev/input/event4: 0000 0000 00000000/Dev/input/event4: 0003 0000 fffffffe/Dev/input/event4: 0003 0001 ffffff66/Dev/input/event4: 0003 0002 000003e4...... The getevent command i

address is a 7-bit address, and the address configured in the kernel is a real address, this requires special attention. Otherwise, i2c will fail, resulting in loading failure of the camera driver. After configuring the relevant information, start the camera and test it. The camera is stopped and cannot be connected to the device. Capture the related kernel log and find that the match id fails. As a result, the driver cannot be loaded, I initially su

Summary of debugging process and method of camera driver Based on the previous debugging of the camera driver, I have summarized some minor experiences: 1. Check whether the camera circuit connection is correct based on the circuit diagram; 2. Use A multimeter to measure the power supply pin of camera and check whether the power supply of camera is normal.ProgramFor power control; 3. Check the spec document of camera and check whether the pin triggering of pwdn and reset is normal and whet

. This shows that the camera can be configured through I2C controller 1. In addition, when debugging the camera, you can use an oscilloscope to measure the waveform based on this schematic to verify that the code is correct. It is also worth noting that it is best to use a multimeter to measure whether each pin of the camera is correctly connected to the chip before the development driver. Otherwise, the im

how to debug camera on Qualcomm android from the perspective of the underlying driver, the architecture and Principles of the Qualcomm camera platform are not described too much.I. PreparationsFrom the project perspective, the software must be ready before the hardware (board) ready. From the perspective of the underlying driver, the software part can be divided into two parts: one is related to the Qualcomm platform, and the other is the sensor part, the common practice is to port the sensor-r

This article turns from: http://blog.csdn.net/qianjin0703/article/details/5894869 1. Overview 2. Data Structure 3. Adapter 4. I2c-core 5. Slave Device 1. Overview 1.1 Definition I2C inter-integrated circuit SMBUS System Management Bus, the I2C subset 1.2 Characteristics The amount of data exchanged is small. The required data transfer rate is low. 1.3 Speed Fas

HS Series Data acquisition card can not only achieve high-speed data acquisition, but also through the (Multi channel) multi-channel measurement and analysis software, to achieve a variety of complex triggering function of the logic relationship, capture the transient high-speed signal and display the corresponding trigger curve.HS4, HS5, HS6 USB high-speed data acquisition cardVarious advanced triggering functionsIn order to control the USB series high-speed data acquisition card, the acquisiti

consists of two parts: platform_device and platfrom_driver. The general process for developing the underlying driver through the platform mechanism is: Define platform_device-> Register platform_device-> define platform_driver-> Register platform_driver. The first thing to confirm is the device resource information, such as the device address and interrupt number. In the 2.6 kernel, the platform device is described by the structure platform_device, which is defined in kernel \ include \ Li

"I'm using a _100mhz oscilloscope, including a 100MHz passive probe, and I should be able to measure 90MHz sine waves correctly, right?" Is the oscilloscope or probe broken? ”I used to be able to answer this question with a little common sense, but now I hear this kind of problem sometimes. Then it may not simply be attributed to common sense, especially in most oscilloscopes, where the oscilloscope's "syst

. Register platform_device. Define platform_driver. Register platform_driver.The first thing to confirm is the device resource information, such as the device address and interrupt number.In the 2.6 kernel, the platform device is described by the structure platform_device, which is defined in kernel/include/Linux/platform_device.h,Struct platform_device {Const char * Name;U32 ID;Struct device dev;U32 num_resources;Struct resource * resource;};An important element of this structure is resource, w

nbs P;return ret; else return-eio , a strange question has a good explanation recently: after I2C configuration sensor, play music through Aplay without movement (no sound), but read codec through Snd_soc_read () ( wm8960) The value of each register is normal (and the same configuration as normal playback), with an oscilloscope measured codec Lrck pin, nothing (this should have clock output, b

Brief The next content will be the basic functions of MPU9250 detailed introduction, mainly divided into modules for elaboration. Clock MPU9250 has two internal clock sources, as well as a PLL.Internal clock Source: Clock Source Description Internal oscillator Low power consumption, but slightly worse clock accuracy X,y or Z-direction gyro MEMS clock, high power consumption, but clock accuracy (as long as the gyro is enabled, it will use the

　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

test black box method, from auxiliary analysis, automatic diagnosis, Provide software security testing solutions on multiple levels, such as rapid positioning. TT offers a wide range of functions beyond traditional security white box testing, and with popular fuzzing security testing methods, the efficiency and quality of security testing can be greatly improved.The following is a list of the features that must be detected for software security testing, demonstrating the range of methods that T

During linux compilation, the following error occurs: "error: the type of array elements is incomplete" -- Linux general technology-Linux programming and kernel information. For details, see the following. System: Fedora Core4 Kernel: 2.6.11.1 Error: 1. CC drivers/i2c/i2c-core.o In file sorted ded from drivers/i2c/i2c