摘要:介绍了以FreeModbus协议找在嵌入式抢占实时操作系统μC/OS-l的STM32平台上,成功实现了Modbus协议的移植。通过详细分析FreeModbus协议花并编写STM32F103VET6微处理器的底层驱动,成功实现了工业Modbus协议RTU和ASCll两种模式的通信功能。测试结果表明,在实际工业生产控制和仪表开发中,应用Freemodbus协议,完全符合工业数据采集、实时控制和数据处理等厂级重复性和精确度要求,在一定程度上降低了工业仪表开发的周期及成本。关键词:实时操作系统,uC/OS-ll,FreeModbus,Modbus协议,STM32Abstract:This paper introduces FreeModbus stack transplanted to the STM32 platform which has been embedded in the preemptive real-time operating system uC/OS-ll,in order that the transplantation of the Modbus protocol is successfuly im-plemented.The FreeModbus stack is analyzed in detail and STM32F103VET6 microprocessor underlying driver is writed,so that the two Modbus industrial communication function RTU and ASCll are successfully realized.Keywords:time operating system,uC/OS-ll,.FreeModbus,Modbus协议,STM32
标签: freemodbus 通信协议
上传时间: 2022-06-25
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Datasheet SHT3x-DISHumidity and Temperature Sensor Fully calibrated, linearized, and temperaturecompensated digital output Wide supply voltage range, from 2.4 V to 5.5 V I2C Interface with communication speeds up to 1MHz and two user selectable addresses Typical accuracy of 2 %RH and 0.3 °C Very fast start-up and measurement time Tiny 8-Pin DFN package
上传时间: 2022-06-29
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pcie(PCI-Express)处理层协议中文详解处理层协议(transaction Layer specification)◆TLP概况。◆寻址定位和路由导向。◆i/o,.memory,configuration,message request、completion 详解。◆请求和响应处理机制。◆virtual channel(ve)Mechanism虚拟通道机制。◆data integrity 数据完整性。一.TLP概况处理层(transaction Layer specification)是请求和响应信息形成的基础。包括四种地址空间,三种处理类型,从下图可以看出在transaction Layer中形成的包的基本概括。一类是对io口和memory的读写包(TLPS:transaction Layers packages),另一类是对配置寄存器的读写设置包,还有一类是信息包,描述通信状态,作为事件的信号告知用户。对memory的读写包分为读请求包和响应包、写请求包(不需要存储器的响应包)。而io类型的读写请求都需要返回I/O口的响应包,
标签: pcie
上传时间: 2022-06-30
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一、建焊盘打开建立焊盘的软件Pad Designer路径:包括采用的制式,现在选公制单位毫米,精度3,右侧问是否需要多重钻孔,这个功能一般是用于做非圆孔。一般圆孔不用勾选。下面设定钻孔样式,一般是圆孔,钻孔内部是否镀铜 plated(no plated即为不镀铜,一般用于塑胶件定位孔),再是钻孔直径,设置精度,是否偏移等。如果是表贴元件,钻孔直径设为0。如果是表面安装元件,把signle layer mode勾选。焊盘一般需要 begin layer和end layer,还有就是soldmask_top,soldmask_bottom,pastemask top,pastemask bottom这几个层面。对表面安装元件来说,只需要begin layer,soldermask_top以及pastemask_top就可以了。鼠标左键点击begin layer,会发现最下面三个对话框被刷新,在下面填入需要的值:从左到右:规则焊盘,热焊盘,反焊盘。1规则焊盘下面需要填入焊盘形状,长宽,是否有偏移。1热焊盘,要求选择焊盘类型,尺寸等;1反焊盘,作用是设定焊盘与周边间距,一般比规则焊盘略大6-10mil。鼠标点击soldermask_top,下面对话框刷新出该选项。按照需要填入数据。Pastemask top同样处理。右边上角还有视图角度选择,Xsection为水平视图,TOP为从上往下看。
标签: cadence allegro
上传时间: 2022-07-02
上传用户:XuVshu
STM32 HAL固件库是Hardware Abstraction Layer的缩写,中文名称是:硬件抽象层。HAL库是ST公司为STM32的MCU最新推出的抽象层嵌入式软件,为更方便的实现跨STM32产品的最大可移植性。HAL库的推出,可以说ST也慢慢的抛弃了原来的标准固件库,这也使得很多老用户不满。但是HAL库推出的同时,也加入了很多第三方的中间件,有RTOS,USB,TCP / IP和图形等等。和标准库对比起来,STM32的HAL库更加的抽象,ST最终的目的是要实现在STM32系列MCU之间无缝移植,甚至在其他MCU也能实现快速移植。
上传时间: 2022-07-08
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ILI9881D Data Sheet for all customerAmorphous TFT LCD Single-Chip Driver 800(RGB)X1280 Resoltion,16.7M-Color Without internal Gramtwo data lanes supports up to 850Mbps on the mipi DSI link
上传时间: 2022-07-19
上传用户:bluedrops
STM32CubeMX是ST出的一款免费的开发工具,近几年ST也在一直大力推这个工具,也在推行新的HAL库(an STM32 abstraction layer embedded software ensuring maximized portability across the STM32 portfolio)硬件抽象层API。使用HAL库开发的好处是方便用户在不同的芯片平台上移植代码。Cube的作用是通过图形化的配置生成基础的工程文件,生成的文件包含了芯片初始化代码,现支持IAR、MDK、TureSTUDIO等IDE, 对于用惯了使用标准库开发的我来说我觉得还是非常方便的。
标签: cubemx教程
上传时间: 2022-07-21
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The GD32F103xx device is a 32-bit general-purpose microcontroller based on the ARM?Cortex?-M3 RISC core with best ratio in terms of processing power, reduced power consumption and peripheral set. The Cortex?-M3 is a next generation processor core whichis tightly coupled with a Nested Vectored Interrupt Controller (NVIC), SysTick timer and advanced debug support.The GD32F103xx device incorporates the ARM ' Cortex?-M3 32-bit processor core operating at 108 MHz frequency with Flash accesses zero wait states to obtain maximumefficiency. It provides up to 3 MB on-chip Flash memory and up to 96 KB SRAM memory. An extensive range of enhanced I/Os and peripherals connected to two APB buses. The devices offer up to three 12-bit ADCs, up to two 12-bit DACs, up to ten general-purpose
标签: gd32f103
上传时间: 2022-07-23
上传用户:aben
Power PCB如何在不同层去设不同线宽之走线1.选择 Setup\Design Rules2.选泽 Conditional Rules Setup3.设定Sousce rule object(可依照不同的状况去选择使用Al/Classes/Nets/Groups/Pin pairs)4.设定Against rule object(可依照不同的状况去选择使用 Layer/Classes/Nets)5.设定Existing rule sets将 Sousce rule object与Against rule object之定按Create产生)6.案例说明一有一条信号CLK_32M当走到Layer1时需为线宽6mil间距6mil;Layer3时需为线宽20mil间距20mil
标签: padslayout
上传时间: 2022-07-24
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MT7688 family integrates a 1T1R 802.11n Wi-Fi radio,a 580MHz MIPS? 24KEcTM CPU,1-port fast Ethernet PHY, USB2.0 host, PCIe, SD-XC,I2S/PCM and multiple slow IOs. MT7688 provides two operation modes-IoT gateway mode and IoT device mode. In IoT gateway mode, the PCI Express interface can connect to 802.1lac chipset for 1lac dual-band concurrent gateway. The high performance USB2.0 allows MT7688 to add 3G/LTE modem support or add a H.264 ISP for wireless IP camera. For the IoT device mode, MT7688 supports eMC, SD-XC and USB 2.0. MT7688 can support the Wifi high quality audio via 192Kbps/24bits I2S interface and VolP application through PCM. In IoT device mode, it further supports PWM, SPI slave,3d UARI and more GPIOs. For IoT gateway, it canl connect to touch panel and BLE, Zigbee/Z-Wave and sub-1G RF for smart home control.
上传时间: 2022-07-24
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