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STM32F37x38x SDADC (Sigma-Delta ADC)入门.pdf
描述在STM32微控制器SDADC的使用,讲的非常详细。差分模式、单端偏移模式、单端零参考模式,电压的计算等
2019-07-28
STM32™ 的 ADC 模式.pdf
单通道、单次转换模式,多通道(扫描)、单次转换模式、单通道连续转换模式、多通道(扫描)连续转换模式、注入转换模式、双 ADC 常规同步模式、双 ADC 快速交替模式、双 ADC 慢速交替模式、双 ADC 交替触发模式、双 ADC 组合常规/ 同步注入模式、双 ADC 组合:同步注入 + 交替模式。这些ADC转换模式的详细说明
2019-07-28
可以引导linux2.6.38以上内核的uboot
TQ2440的u_boot不能引导2.6.36以上的内核,用TQ2440的u_boot修改的,可以引导linux2.6.36以上的内核,同时兼容linux2.6.37以下老版本内核
用法:
#make distclean
#make Wamy2440_config
#make
下载u-boot.bin后一定要重新设置一下起动参数(方法:命令0,命令2,命令s,再重起)
2011-04-29
cortex M3 stm32 uboot
ST官方发布了uclinux for stm32f103zet6,但引导uclinux的bootloader源码没有公开,便下定决心想为stm32移植了uboot,后来发现工作量太大了,现在的进度是汇编起动代码,串口 时钟 外部存储器FSMC初始化,小部份makefile,还有STM32的硬件函数库修改好了。
2011-02-23
usb2.0协议.rar
USB 是一种支持热插拔的高速串行传输总线,它使用差分信号来传输数据,最高速度
可达 480Mb/S。USB 支持“总线供电”和“自供电”两种供电模式。在总线供电模式下,
设备最多可以获得500mA的电流。 USB2.0 被设计成为向下兼容的模式,当有全速 (USB 1.1)
或者低速(USB 1.0)设备连接到高速(USB 2.0)主机时,主机可以通过分离传输来支持它
们。一条 USB 总线上,可达到的最高传输速度等级由该总线上最慢的“设备”决定,该设
备包括主机、HUB以及USB功能设备。
2009-07-02
51+sl811读写U盘的源程序+原理图
本文介绍了在基于ARM7的嵌入式系统上开发 USB接口的详细内容。 项目使用 ARM
(MCU处理器)和PDIUSBD12(USB芯片)完成了U 盘的开发。主要内容涉及 USB 接
的 U 盘开发过程中所涉及的技术内容;重点介绍项目调试方法与步骤;并附上了自己在
发此项目过程中的一些心得与体会。
2009-06-19
CC2431定位原理
Figure 1 shows a simplified system for location detection. “Reference node” is a static node
placed at a known position. For simplicity this node knows its own position and can tell other
nodes where it is on request. A reference node does not need to implement the hardware
needed for location detection, it will not perform any calculation at all. A “Blind node” is a node
built with CC2431. This node will collect signals from all reference nodes responding to a
request, read out the respective RSSI values, feed the collected values into the hardware
engine, and afterwards it reads out the calculated position and sends the position information
to a control application.
The minimum data contained in a packet sent from a reference node to a blind node shall be
the reference nodes’ X and Y parameters. The RSSI value is calculated by the receiver, i.e.
the blind node.
The main feature of the location engine is that the location calculation can be performed at
each blind node, hence the algorithm is decentralised. This property reduces the amount of
data transferred in the network, since only the calculated position is transferred, not the data
used to perform the calculation.
To map each location to a distinct place in the natural environment, a two dimensional grid is
used. The directions will, in the following, be denoted X and Y. In all the figures X is defined to
be the horizontal direction and Y the vertical. The CC2431 Location Engine can only handle
two dimensions, but it’s possible to handle a third dimension in software (i.e. to represent
floors in a building). The point named (X, Y) = (0, 0) is located in the upper left corner of the
grid.
2009-04-13
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