嵌入式通信什么是数据采集接口板卡卡配件有做货期快的吗?急购!

文章首发于同名微信公众号:DigCore欢迎关注同名微信公众号:DigCore,及时获取最新技术博文。原文链接:https://mp.weixin.qq.com/s/wSFkqFQGlY7KuCHgOETqpg(说明:此处的文章从微信公众号拷贝而来,图片或者排版上可能存在一定的瑕疵,欢迎点击原文链接阅读)串口启用流程开讲前,先找几款芯片的串口demo程序瞄一眼。依次有STM32的V3.5标准库、nRF52832的官方demo以及51核的STC15系列单片机的官方DEMO。从以上的部分demo例程来看,并结文章《嵌入式硬件通信接口协议-UART(一)协议基础》的介绍,在启用串口的时候,需要配置的那几个参数有波特率、数据位、校验位、停止位等,从demo的源码中也是能够体现出来的。而略有不同的是,在引脚配置灵活的ARM中,需要针对引脚进行配置。验证输入输出完成了串口的初始化,即可对输入输出进行操作,来验证串口是否可以正常的发送和接收数据。一般的,最直接的方式就是向输出寄存器写入数据,就可以让芯片去完成UART信号输出到对应的引脚上。如下图依次有STM32的V3.5标准库、nRF52832的官方demo以及51核的STC15系列单片机的官方DEMO。验证串口的输出,即在串口初始化成功后,对串口的输出寄存器写入数据,而芯片引脚则使用USB转TTL模块连接,USB端插入计算机的USB口,利用计算机的串口助手软件实现对数据的收发。调试-输出开发调试过程中,输出的内容基本上就是想查看的变量值、代码的执行位置跟踪、算法或者某些运算的结果等等。这些输出,仅用于调试阶段,而在人机调试过程中,使用计算机的串口助手软件进行交互,则输出的数据应该便于识读和判断。C库函数printf格式输出重定向到串口输出输出串口数据过程中,需要向寄存器逐字节传入数据的,而在传送之前必不可少的,就是将要发送的数据、字符放到同一个Buffer后,执行轮询的方式传送直到buffer内容全部被传送。而这个“放”的过程也是需要做些计算、判断,尤其是增加必要的字符来描述输出信息,保证信息的可识读。在C标准库printf函数就有格式输出的功能,利用这个接口更便于调试输出这个过程。这就需要将printf函数重定向到串口输出上!实现重定向只需3步:Options for target选项卡内勾选Use MicroLIB在串口实现的*.c文件内,将stdio.h文件和stdarg.h文件包含进来重新定义int fputc函数的内部实现完成以上3步,即可利用printf函数来格式化输出,并且能够在串口上接收到。ANSI C标准中有几个标准预定义宏:__LINE__:源代码中的行号(字符串形式)__FILE__:当前*.c源码文件的文件名(字符串形式)__DATE__:编译日期(字符串形式)__TIME__:编译时间(字符串形式)__STDC__:当要求程序严格遵循ANSI C标准时该标识被赋值为1;__cplusplus:当编写C++程序时该标识符被定义。有了上一步实现printf函数的重定向到串口后,基本就可以完美使用串口进行调试程序。调试过程中可利用ANSIC标准中的内置宏,比如LINE可以很方便跟踪代码执行到哪一行。调试-输入串口的接收,有轮询、中断、DMA等方式。轮询方式,特点是消耗芯片资源,否则容易丢数据;中断方式,特点是响应快、资源占用低;DMA方式,各个芯片的配置不同而无法每款芯片都有该功能,所以代码兼容性可移植性较差。一般地,对输入的数据进行分析判断时,如果是轮询的方式,则直接在收到后即判断;中断和DMA方式,都可以考虑存到buffer后再分析处理。初见数据协议解析如果是简单几个字符的指令,可以用上述那样简单判断,但是在稍微中等级别的工程项目中,用那样的方式都已经很不便于处理和扩展了。比如有一串数据,并且长度不确定,将会超过10个字节、20个字节、100个字节甚至更多,那么这时候就必须使用协议解析的方式。通常的,数据协议都会有协议头、长度、校验、数据内容等部分组成,数据将以包的形式进行收发,这时候使用解析的方式,对数据包进行解析。这就是广泛使用的“起始式协议”。实际的产品中有IC/ID读卡器模块的接口协议:也有使用在PM2.5传感器上的:这些都属于开发的模块产品,对外使用串口通信,并且数据协议采样了“起始式”的帧结构模式。★★★★★推荐文章《【嵌入式编程】函数返回类型设计》《【嵌入式编程】平台大小端存储差异解决办法》《嵌入式硬件通信接口-使用RingBuffer处理数据(二)详细设计过程》《嵌入式硬件通信接口-使用RingBuffer处理数据(一)》《快速开发MQTT(一)电子工程师眼中的MQTT》《快速开发MQTT(二)初识MQTT》《MQTT客户端搭建-最清晰的MQTT协议架构》《MQTT服务端搭建-最快方式验证自己开发的客户端》★★★★★相似文章《嵌入式硬件通信接口协议-UART(五)数据包设计与解析》《嵌入式硬件通信接口协议-UART(四)设计起止式的应用层协议》《嵌入式硬件通信接口协议-UART(三)快速使用串口及应用》《嵌入式硬件通信接口协议-UART(二)不同电气规范下的标准》《嵌入式硬件通信接口协议-UART(一)协议基础》《嵌入式硬件通信接口协议-SPI(三)模拟接口应用》《嵌入式硬件通信接口协议-SPI(二)分层架构设计模拟接口》《嵌入式硬件通信接口协议-SPI(一)协议基础》《嵌入式硬件通信接口协议-IIC(一)协议基础》★★★★★扩展阅读《【硬件电路】AltiumDesigner18规则检查含义》《【硬件电路】N沟道、P沟道MOS管基本原理与应用案例》}
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I-PEX这些进口连接器,具有品质可靠、接插性能稳定、防护等级高、适用范围广等优点。但是面临交期长,不稳定的风险,选择一个好的供应商很关键。热门连接器供应以下是近期搜索热度很高的物料型号:查询库存小刘:1840677677852117-02412328702-4DM3NS-SF-PEJ(800)U.FL-R-SMT-1(80)BM23FR0.6-50DS-0.35VDF23C-60DP-0.5V(92)FH34SRJ-6S-0.5SH(50)FH26W-25S-0.3SHW(60)BM20B(0.8)-24DS-0.4V(51)BM20B(0.8)-20DS-0.4V(51)BM20B(0.6)-30DP-0.4VBM28B0.6-16DP/2-0.35V(51)BM28B0.6-16DS/2-0.35VBM28B0.6-10DS/2-0.35V(51)BM23FR0.6-30DS-0.35V(51)BM23FR0.6-24DP-0.35VBM23FR0.6-24DS-0.35VBM23FR0.6-16DP-0.35VBM23FR0.6-6DP-0.35V(878)BM23FR0.6-12DS-0.35VBM23FR0.6-10DS-0.35V(878)BM23FR0.6-10DP-0.35VBM25-4S/2-V(51)DF12(5.0)-40DP-0.5V(86)DF12(5.0)-30DP-0.5VDF12(5.0)-20DP-0.5V(86)DF12D(3.0)-30DP-0.5VDF12D(3.0)-80DP-0.5VDF12-20DS-0.5VDF12-30DS-0.5V(86)BM20B(0.8)-10DS-0.4V(51)DF40HC(4.0)-60DS-0.4V(51)DF40HC(3.5)-30DS-0.4V(51)DF40HC(3.5)-20DS-0.4V(51)DF40HC(3.0)-30DS-0.4V(51)DF40C(2.0)-20DS-0.4V(51)DF40C-60DP-0.4V(51)DF40C-40DS-0.4V(51)DF40C-24DS-0.4V(51)DF40C-20DP-0.4V(51)DF40C-10DS-0.4VDF40C-40DP-0.4V(51)FH41-40S-0.5SHFH36W-39S-0.3SHW(50)FH42-7S-0.3SHW(10)TF31-40S-0.5SH(800)TF31-30S-0.5SH(800)TF31-18S-0.5SH(800)TF31-8S-0.5SH(800)TF07-60S-0.5SHDF56C-30S-0.3VBK13C06-32DP/2-0.35V(865)DF36-15S-0.4V(51)DF36-30P-0.4SD(51)CX90B1-24PFH34SRJ-4S-0.5SH(50)FH34SRJ-10S-0.5SH(50)FH34SRJ-14S-0.5SH(50)FH34SRJ-16S-0.5SH(50)FH34SRJ-18S-0.5SH(50)FH34SRJ-22S-0.5SH(50)FH34SRJ-24S-0.5SH(50)FH34SRJ-45S-0.5SH(50)FH35C-45S-0.3SHW(50)FH35C-31S-0.3SHW(50)FH35C-25S-0.3SHW(50)FH35C-21S-0.3SHW(50)FH35C-15S-0.3SHW(50)FH52-10S-0.5SHBM20B(0.8)-20DP-0.4V(51)DF12NB(5.0)-30DP-0.5VDF40HC(3.0)-50DS-0.4V(51)DF51K-6DS-2C(800)DF51K-8DS-2C(800)DF51K-4DS-2C(800)5027904091053261057170F101AF-RC04302504000430250600TX25-100P-LT-H1EDF63-3S-3.96CMX34020NF124 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