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m16+cp2200组成的网络接口。
m16使用内部RC振荡8M,如果要提高主频,请注意修改模拟总线读函数。
cp2200模块使用www.icdev.com.cn的,更改pin44连接VCC,即总线复用方式,地址数据复用。
软件编写使用avrstudio4.12+sp4+winavr(avrstudio自带的winavr嵌入方式)。
硬件连接:
m16 | cp2200
PORTA | AD0-7
PB0 | RST
PB1 | CS
PB2 | RD
P
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An effecient algorithm has been proposed by
Schmidl and Cox for carrier frequency estimation in orthogonal
frequency-division multiplexing systems. The scheme is based
on the transmission of a training symbol composed of two
identical halves
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Adaptive equalization教程-Adaptive equalizers compensate for signal distortion
attributed to intersymbol interference (ISI), which is
caused by multipath within time-dispersive channels.
Typically employed in high-speed communication
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四路信息时分复用和解复用,包含串并转换,并串转换,提取帧同步,分频,移位寄存器。-Quad information time-division multiplexing and demultiplexing, contains the string conversion, parallel-serial conversion, extracting the frame synchronization, frequency division, the shift register.
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1.MCU:AT89S52芯片或AT89C52
2.晶振:12MHz
本程序带温度补偿,采用DS18B20测量温度
1.LCD1602液晶屏有显示后,才接入超声波模块。
2.注意超声波模块电源的极性。不清楚请参好淘宝的电路图
3.没有选用频率为12MHz晶振,用了别的频率晶振,单片机定时器的测量值与
发出的40KHz频率脉冲不对。
4.使用者经常误发出20KHZ脉冲当40KHZ脉冲。(40KHz频率脉冲,周期25us,
占空比为50 = 12.5u
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