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[转帖] 【PIC32 starter kit】之性能初窥

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发表于 2018-11-28 15:41:02 | 显示全部楼层 |阅读模式
板载资源介绍
一.正面:7 C& V4 `9 S2 H" ]# v. Y* i: n( _3 y
官方原文指导:- @# m0 G( @) Q" g) {2 U( ]2 ?+ }
The top assembly of the board includes these key features, as indicated in Figure 1-1:
1.    PIC32MX795F512L 32-bit microcontroller (U2).   核心的东西9 U5 r* R3 _2 X' P' }5 y
2.    Green power indicator LED (D4).    电源指示灯
3.    On-board crystal for precision microcontroller clocking (8 MHz) (Y1). 板上晶振/ e' U( {( I/ h9 p; Y- u( U
4.    USB connectivity for on-board debugger communications (J7).   小口USB连接器用于DEBUG* }$ h& [# Y9 M, b, @- C- z
5.    Debug indicator LED (D7).                 Debug指示灯
6.    Three push button switches for user-defined inputs (SW1, SW2, SW3). 3个按键,用户输入- D/ _) m, N: D# G
7.    Three user-defined indicator LEDs (D1, D2, D3).   3个用户指示灯2 l2 ?% j% U; P3 t
8.    USB Type A receptacle connectivity for PIC32 host-based applications (J4). USB连接器用于用户使用
9.    HOST mode power jumper (J5).   电源模式跳线6 F1 z9 \9 D# }# S
10.  LAN8740A PHY Daughter Board headers (J2)     这个拿到板的人一看就明白,网络连接接口9 K% T6 m$ K# F1 ], o8 n5 x* Y
11.  50 MHz Ethernet PHY oscillator (Y3).  50MHZ晶振 没看文档前还以为是电容   
12.  32 kHz oscillator (optional) (Y2). 32KHZ晶振
13.  USB Host and OTG power supply for powering PIC32 USB applications (U4). 用户使用的USB工作芯片。
二.反面:
1. Regulated +3.3V power supply for powering the starter kit through USB or
expansion board (U8).   3.3V的电源支撑6 [) X+ B) x. k: m
2.Connector for various expansion boards (J1).  扩展板连接器
3.USB Type micro-AB receptacle for OTG and USB device connectivity for PIC32
OTG/device-based applications (J3).       OTG,micro-USB连接器9 p% K( e# V& G& H$ i
4.PIC24FJ256GB106 USB microcontroller for on-board debugging (U6).usb-debug芯片。
基本情况就介绍到这儿,这个板子本身所带的资源及信息。

=======================================================================================================4 [' P( u) l# P& |$ g
三.性能及相关参数(捡主要的)5 f$ A% H" z3 Y6 f; d
3.1 power supply- v2 E6 V  \, }( t# p; A
•  USB bus power connected to USB debug connector, J7.USB_debug连接器提供; T) \% h  z2 U4 _7 I* \) ^7 c
•  An external application board with a regulated DC power supply that provides +5V  J1也就是板子背面最大的那个接扩展板的接口接供,暂不满足。
can be connected to the J1 application board connector that is provided on the bottom side of the board.
3.2 PIC32 USB Connectivity(USB连接). E( C; F' _- F
USB连接有3种模式,像大家最常用U盘,接到PC上,这种U盘就属于DEVICE MODE,PC就属于HOST MODE这种是大家最常用到的,+ A( {) v7 M1 S1 }) J7 A  k" h6 G
还有一种是OTG模式,
•HOST Mode – Connect the device to the Type A connector J4, located on the top side of the starter kit. If using the Debug USB port to power the Host port, install8 ]% \2 c+ F: ?) M% P! {
jumper J5 to short the back-power prevention diode. Note that a maximum of  ~400 mA can be supplied from the Debug USB port to the Host port using this method.* P+ \1 [: ~8 {9 V
如果想要使用USB主机模式,那么必需就要接到J4上,也就是那个我们最常见的USB口上,如果是用MICRO-USB供电,则需要短接J5,也就是我们
在面板上看到的那两个排针。- V) [% ~  e7 A& W' Q' J
•DEVICE Mode – Connect the debug mini-B USB cable to port J7 and then connect the starter kit to the host using a cable with a Type-B micro-plug to the starter
kit’s micro-A/B port J3, located on the bottom side of the starter kit. The other end of the cable must have a Type-A plug. Connect it to a USB host. Jumper J5 should
be removed.+ j1 j0 H) j2 T* L. L- H& x
DEBUG口,即是设备模式,但是需要将j7,跟J3都连接到电脑,J5也就是那个跳线需要断开。+ V' E! U4 V/ a. L
•OTG Mode – Connect the starter kit to the OTG device using an OTG micro-A/B cable to the micro-A/B port J3, located on the bottom side of the starter kit. The& y5 s8 r$ q, l/ Z1 V
starter kit provides an on-board power supply capable of providing 120 mA Max. This supply is controlled by the PIC32MX795F512L microcontroller. Jumper J5 should
be removed.
只需要连接J3,但J5跳线要断开。

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