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板载资源介绍$ O N _& d$ J, s: X% c
一．正面：
- H) i- i8 w" U8 Z& Z3 F }官方原文指导：
( H# s+ W* t3 G2 Y/ yThe top assembly of the board includes these key features, as indicated in Figure 1-1:& z3 T2 O' c+ L# f9 d6 m
1. PIC32MX795F512L 32-bit microcontroller (U2). 核心的东西1 m# T* o7 v! U- ^1 S3 J& T! Z: B& }
2. Green power indicator LED (D4). 电源指示灯
- P) j- @ N# f B3. On-board crystal for precision microcontroller clocking (8 MHz) (Y1). 板上晶振3 T& |2 b' [9 C. x+ J8 q
4. USB connectivity for on-board debugger communications (J7). 小口USB连接器用于DEBUG; ?1 A7 ?* K: u- H' {8 E7 r" N
5. Debug indicator LED (D7). Debug指示灯
' ~( j& K( [. o% Y7 H6 Z. e/ R* n' y6. Three push button switches for user-defined inputs (SW1, SW2, SW3). 3个按键，用户输入
/ x9 M/ H$ H, G) C Z7. Three user-defined indicator LEDs (D1, D2, D3). 3个用户指示灯7 ?& [8 [$ t' T! B6 w& M
8. USB Type A receptacle connectivity for PIC32 host-based applications (J4). USB连接器用于用户使用
8 z) r1 ~7 a+ ]" ]9. HOST mode power jumper (J5). 电源模式跳线# n9 i$ ^9 l) g' S+ x; u; P
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; Y3 E( R3 i, b) T% E% P, N$ R
11. 50 MHz Ethernet PHY oscillator (Y3). 50MHZ晶振 没看文档前还以为是电容 ! X, \ R1 G1 Z& Q
12. 32 kHz oscillator (optional) (Y2). 32KHZ晶振; Z5 @2 `6 C" g
13. USB Host and OTG power supply for powering PIC32 USB applications (U4). 用户使用的USB工作芯片。
4 J {1 F) ?* b/ A5 W1 t二．反面：
, Q% T: M# J% O: c* Q" B: T# ~1. Regulated +3.3V power supply for powering the starter kit through USB or- @8 n! F, a1 `: N" \/ a. L
expansion board (U8). 3.3V的电源支撑8 w# G, s% [. I/ |+ q* }
2.Connector for various expansion boards (J1). 扩展板连接器
# T6 [. @3 M) _- j9 A3.USB Type micro-AB receptacle for OTG and USB device connectivity for PIC32
! s' ?0 G, o: d r7 E3 W \OTG/device-based applications (J3). OTG,micro-USB连接器
5 g: `1 I( N' ^ X4.PIC24FJ256GB106 USB microcontroller for on-board debugging (U6).usb-debug芯片。2 a" X( B2 [6 H8 J9 M; i, B
基本情况就介绍到这儿，这个板子本身所带的资源及信息。% X% K4 L/ ]8 P( x. t* n3 A
6 {1 W4 X* l/ L$ w# M
=======================================================================================================1 e2 |3 Y" H" y8 R
三．性能及相关参数（捡主要的）1 f) _2 a/ h) H- A( T# B; U
3.1 power supply
4 W$ y% C6 ^1 c• USB bus power connected to USB debug connector, J7.USB_debug连接器提供
7 b$ u1 j3 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。0 R/ z# f5 U7 Y) t+ c0 s
can be connected to the J1 application board connector that is provided on the bottom side of the board.
+ {# f1 p) `2 n% U1 B( W3.2 PIC32 USB Connectivity（USB连接）- K) l3 i7 G* b. L+ g( N. |
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，
' Y9 {0 C) F6 @7 a G3 u7 N0 c还有一种是OTG模式，% }" Y8 X& Z% _
•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, install
n1 h, r; A1 U4 l3 F, Ejumper 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.4 m9 R0 [* K/ l- h: l" z* `
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/ p0 I% L6 O: F# R- r- I3 `- B; Y
在面板上看到的那两个排针。
: Y2 { X0 q% c7 \•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
7 e6 l& Y: x( ?5 q% y% F7 w! w9 Tkit’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
5 H$ C8 `: u& b9 R! G1 q6 b+ cbe removed.
& V: p+ ^3 w& PDEBUG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。2 ]! h: [1 [+ i: x% a8 m! \4 O
•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. The8 G# ~: Q3 s4 ~, W
starter kit provides an on-board power supply capable of providing 120 mA Max. This supply is controlled by the PIC32MX795F512L microcontroller. Jumper J5 should4 u' q/ x* \' v" i9 A/ R. R
be removed.
. w3 Y9 P$ X7 V- `* K( A只需要连接J3,但J5跳线要断开。 |
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发表于 2016-4-7 11:42
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