beaglebone adc

These two days to the external interrupt and the ADC looked down, the personal feeling that the external interruption is not difficult, it is not written down, after all, it is a waste of time to write. ADC is more complex, and if you want to make it possible to use the ADC completely freely, it has to go through many practices. Because I have learned the library

This article was originally written by Guan Haitao. The original author has all rights reserved. For more information, see the source.As an industrial chip, ADC sampling is a very important peripheral. Stm32 integrates three 12-bit, 18-channel internal ADC, with a maximum speed of 1 microsecond. Combined with DMA, it can free up the CPU for better processing.Other logic functions on the

On the basis of the previous note, complete a simple ADC sampling experiment.The first step: preparation of knowledge1, first look at the Bb_black ADC pin position. Is the distribution of the analog input ports of the bb_black.There are three important messages to note on this chart:(1) Number of analog input ports: ARM chip A total of 8 ADC channels, the Bb_blac

Before learning a number of modes of electricity, A/D conversion of the knowledge, also Baidu a lot of information is difficult to understand. Forget, first self-righteous, and so on after the study of specialized courses and then again. (You must learn to go home in winter vacation.) Well, that's what it's all about. Reading so much information, the sense of A/D conversion is the voltage (or other analog: such as pressure, image, etc.) into the digital, d/A is the reverse, and the

Author: DriverMonkey Mail: booworepeng@Hotmail.com QQ: 196568501 Phone: 13410905075 Welcome to the discussion (to undertake various embedded outsourcing projects, linux, wince, single chip microcomputer, and PC development) 1. Install SD on your computer.2. find the BeagleBone SDK installation directory 3. go to this path/ti-sdk-am335x-evm/bin find create-sdcard.sh script 4. run script create-sdcard.sh 5. copy file/ti-sdk-am335x-evm/targetNFS to

Flash (string delayms);virtual void outputstate ();Virtual ~led ();};led::led (int number) {This->number = number;Ostringstream s;s Path = string (S.str ());}void led::writeled (string filename, string value) {Ofstream FS;Fs.open ((path+filename). C_STR ());FS Fs.close ();}void Led::removetrigger () {Writeled ("/trigger", "none");}void Led::turnon () {cout Removetrigger ();Writeled ("/brightness", "1");}void Led::turnoff () {cout Writeled ("/brightness", "0");}void Led::flash (String delayms =

Now the software, radio, digital Image acquisition requires a high-speed A/d sampling to ensure the effectiveness and accuracy, the general measurement and control system also hopes to have a breakthrough in precision, the tide of human digitalization to promote A/D converter constant change, and A/D converter is the pioneer of digital human realization. A/D converter has been developed for more than more than 30 years and has undergone several technological innovations, ranging from parallel, s

Embedded systems occupy an important position in the field of micro-control (temperature, humidity, pressure detection, four-axis aircraft), which are implemented by microprocessor CPUs (such as STM32) and sensors and controllers, and connect them so that they can communicate with each other properly. is the module to be sued in this section, ADC Analog-to-digital conversion peripherals. Let's start with the simplest experiment and learn more about th

Normal through the file system access to the value of Ain serial port, you can use Fread and other file IO read/sys/bus/iio/devices/iio:device0/in_voltage*_raw content. But this requires high frequency access to the ADC is very inefficient, the data needs to be copied from the disk to the kernel process space, and then copied to the user process space, consuming unnecessary resources. This problem can be solved by memory innuendo, Mmap can realize the

ADC conversion is the input analog signal volume, the microcontroller converted to digital volume. Reading the number must wait for the conversion to complete, the completion of a channel reading is called the sampling period. Sampling period generally = conversion time + read time. The conversion time = sampling time + 12.5 clock cycles. The sampling time is the time you tell the STM32 sampling analog through the register, the longer the setting the

clear points:A Controls the Gpioport output of the BBB board by 0 or 1. The value of the value file under the corresponding gpioxxx under the/sys/class/gpio folder is changed.B Change the Gpioport input and output mode is to change the/sys/class/gpio folder under the corresponding gpioxxx under the direction file value is in or outC The entire BBB board hardware Device control by reading and writing the corresponding Linux device virtual files, so learning BBB board file Structure system is ver

STM32 ADC synchronization rule mode (two-channel) It feels better to directly paste the code ...... 　　 1 # include "adc. h "2 3 float AD1_Value [N]; 4 float AD2_Value [N]; 5 volatile u32 ADCConvertedValue [N]; // AD × ue» ° ³ Ç çø, Õ Ó RAM 0.8KB 6 7 8 void Adc_Init (void) 9 {10 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 11 ADC_InitTypeDef ADC_InitStructure; 12 GPIO_InitTypeDef GPIO_InitStructure; 13 DMA

/* ADC. H */# Define adc1_dr_address (u32) 0x4001244c)Void adc_configuration (void ); /* ADC. C */# Include "ADC. H"V16adc_convertedvalue; // This variable is used to store the ADC Conversion Result read by DMA. In the main function, extern v16adc_convertedvalue can use the converted result. /*

1. BackgroundThis experiment is based on stm32f429 core board and has profound meaning for understanding stm32cube use. Using DMA for ADC sampling, with the advantage of fast, greatly reduce CPU consumption, for data acquisition system has a great advantage, especially its single 2.4MSPS sampling speed, three-way combination can achieve amazing 7.2MSPS sampling speed, for general applications can be satisfied. 2.stm32cube Configuration 2.1 The project

High speed ADC Clock jitter solution The clock jitter of the high-speed ADC affects the SNR of the high-speed ADC, while the signal-to-noise ratio determines the effective range of the analog front-end input. Therefore, it is necessary to determine the effective input range of the analog front end, then determine the SNR that should be satisfied, and then deduce

The book connects to the text and starts to toss about the DMA transmission of the ADC. Because everyone is talking about DMA, even the st example uses DMA. The data collected by the ADC is stored in a fixed register. When multiple channels are sampled in the conventional sampling method, DMA can be used to avoid data loss. When the DMA function of the ADC is e