spi

Micropython实例之TPYBoardv102开发板DIY照相机

心已入冬 提交于 2019-12-09 21:27:30
摄像头(CAMERA或WEBCAM)又称为电脑相机、电脑眼、电子眼等,是一种视频输入设备,被广泛的运用于视频会议,安防系统 、图像采集系统、 环境监控 、工业现场过程控制 等方面。本实验用TPYBoard v102以及PTC06 串口摄像头模块DIY一个简易的照相机。 视频演示: http:// https://v.qq.com/x/page/s0608s2re8g.html 1.所用器材: l TPYBoard v102 1块 l PTC06 串口摄像头模块1个 l 杜邦线若干 l TF卡1个 l 下载数据线1条 2.TPYBoard v102简介: TPYBoardv102主控芯片采用STM32F405,M4的内核,168MHZ的最高运行速度,1024KB的Flash,192KB的RAM,内置SD卡槽,最大支持8G内存的内存卡。板载四个LED灯和一个加速度传感器。TPYBoard v102板载30个通用GPIO接口、 2个SPI接口、2个CAN接口、2个I2C接口、 5个USART 接口、 2个ADC接口(精度12bit )、2个DAC接口、1个SWD接口。可与大部分常用传感器模块连接。 3. PTC06 串口摄像头模块简介: PTC06 串口摄像头模块是一款集图像采集、拍摄控制、数据压缩、串口传输于一体的工业级图像采集处理模块

Communication between USART and SPI

孤街浪徒 提交于 2019-12-08 13:28:50
问题 Is it possible the communication between USART2 and SPI1 in stm32f10x??? I asked because USART2 clock works with APB1 and SPI1 clock works with APB2. and in practice i could have communication between USART1 and SPI1 but couldnt with USART2. 回答1: Well irrespective of clock , you can communicate with individual peripherals. APB1 and APB2 are just clock sources and it should not impact the communication. 来源: https://stackoverflow.com/questions/24778183/communication-between-usart-and-spi

Controlling AD5270 10-bit Potentiometer with Arduino

依然范特西╮ 提交于 2019-12-08 12:33:29
问题 I'm having trouble controlling an AD5270 10-bit Digital Potentiometer. It seems that no matter what I write to the register the actual value of resistance between the terminal A and the wiper does not change. I'm assuming I'm running into a problem with the "Falling Edge Synchronization Signal" Specifically, from page 10 of the data sheet: SYNC: Falling Edge Synchronization Signal. This is the frame synchronization signal for the input data. When SYNC goes low, it enables the shift register

spidev Linux driver on Intel Atom board

烈酒焚心 提交于 2019-12-08 12:30:24
问题 I am working on bringing up SPI on Kontron's Atom-based SMARC-sXBTi board under Linux. Kontron provided Yocto BSP but it does not include SPI driver. I rebuilt Linux with SPI support. I can see the SPI controller in lspci and in sysfs the SPI PCI device is bound to pca2xx_spi_pci driver. As I understand this is a platform driver which does not expose user mode API and I need spidev to be able to work via /dev/spidev but when I modeprobe spidev I don't see anything happening: no file added to

阿里巴巴是如何打通 CMDB,实现就近访问的?

匆匆过客 提交于 2019-12-07 18:54:13
CMDB在企业中,一般用于存放与机器设备、应用、服务等相关的元数据。当企业的机器及应用达到一定规模后就需要这样一个系统来存储和管理它们的元数据。有一些广泛使用的属性,例如机器的IP、主机名、机房、应用、region等,这些数据一般会在机器部署时录入到CMDB,运维或者监控平台会使用这些数据进行展示或者相关的运维操作。 在服务进行多机房或者多地域部署时,跨地域的服务访问往往延迟较高,一个城市内的机房间的典型网络延迟在1ms左右,而跨城市的网络延迟,例如上海到北京大概为30ms。此时自然而然的一个想法就是能不能让服务消费者和服务提供者进行同地域访问。 我们在集团内部的实践中,这样的需求是通过和CMDB打通来实现的。 Nacos 的服务发现组件中,对接CMDB,然后通过配置的访问规则,来实现服务消费者到服务提供者的同地域优先。 <div data-type="alignment" data-value="center" style="text-align:center"> <div data-type="p">图1 服务的同地域优先访问</div> </div> 这实际上就是一种负载均衡策略,在Nacos的规划中,丰富的服务端的可配置负载均衡策略是我们的重要发展方向,这与当前已有的注册中心产品不太一样。在设计如何在开源的场景中,支持就近访问的时候

(BLE) CC2640R2 SPI驱动(基于TI Drivers) 注意点

喜欢而已 提交于 2019-12-07 15:45:12
系统升级功能需要 把内部flash数据发送到外部flash做备份等操作。 注意,内部flash起始地址为0,和NULL是一样的, 因此在使用驱动接口的时候,对于第一个page的flash,会当作NULL处理, 这就引发bug,SPI驱动会认为TX-BUF为NULL而使用默认的0x00作为填充数据! 所以对于这个特别的page,先拷贝到ram再发送到驱动层, 且注意,不要使用memcpy,因为也会进行NULL判断。 按照如下方式(代码来自upgrade.c) //then copy the first page /****************************************************** Caution!!!! The fisrt flash page start addr is 0 !!! That is the same as NULL!!!! so copy to ram buffer first!!! DO NOT use memcpy!! ******************************************************/ do{ uint8_t buff[4]; pSrc = (const uint8_t*)INTFLASH_BLE_APP_ADDR; dstAddr=extFlashAddr; ((uint32

Initializating SanDisk SD card using SPI fails after doing HW reset

巧了我就是萌 提交于 2019-12-07 12:47:57
问题 I am using an STM32 micrcocontroller to interface an SD card memory using the SPI peripheral. I have done tests with 2Gb , 4Gb , 8Gb and 16Gb SanDisk cards. When I perform a reset with the 2Gb and 8Gb cards , nothing happens and I keep going with my tests. However, with 4Gb and 16Gb , once the reset is performed intialization fails . In fact , at the first insert in the SD slot , these cards are quite good initialized but one I perform the reset it does'nt pass. When I tried to debug this

SPI_IOC_MESSAGE(N) macro giving me fits

。_饼干妹妹 提交于 2019-12-07 11:43:18
问题 I'm having trouble getting a SPI program I'm working on to behave correctly and it seems to be some issue with the SPI_IOC_MESSAGE(N) macro. Here's sample code that DOESN'T work (ioctl returns EINVAL (22) ): std::vector<spi_ioc_transfer> tr; <code that fills tr with 1+ transfers> // Hand the transmission(s) off to the SPI driver if (tr.size() > 0) { int ret = ioctl(fd, SPI_IOC_MESSAGE(tr.size()), tr.data()); if (ret < 1) { int err = errno; } } My test code right now is creating a vector of

针对SPI协议的分析

て烟熏妆下的殇ゞ 提交于 2019-12-07 11:40:37
SPI的时许操作不是根据sys_clk来进行的,而是在触发之后,根据sys_clk来重新产生一个SPI的时钟,然后根据SPI的时钟来进行数据的发送和接收,当然其内部的操作步骤仍然使用的是状态机。 来源: https://www.cnblogs.com/zzm1/p/12001145.html

dubbo源码分析-spi机制

江枫思渺然 提交于 2019-12-07 10:55:02
用法 定义接口 @SPI public interface SayHello { void sayHello(); } 实现接口 public class Hilary implements SayHello{ @Override public void sayHello() { System.out.println("Trump is pig!"); } } public class MarcoRubio implements SayHello{ @Override public void sayHello() { System.out.println("the ZTE is doing harm to our country!"); } } 在类路径下resources下创建META-INF/dubbo,在以上目录创建以接口全名为文件名,key=value格式定义实现类 文件内容如下 hilary = com.dubbo.learn.java.Hilary marcoRubio = com.dubbo.learn.java.MarcoRubio 使用 public class SayHelloTest { private ServiceLoader<SayHello> serviceLoader = ServiceLoader.load(SayHello.class);