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板载资源介绍
* B( F8 y7 a4 ?) _) H一．正面：
3 G) m: T f, |- F( m官方原文指导：
1 C4 O) l. h, } ]The top assembly of the board includes these key features, as indicated in Figure 1-1:) I* |: v- l7 v! }# W
1. PIC32MX795F512L 32-bit microcontroller (U2). 核心的东西
6 W' o1 ]5 X' D# q- X$ [/ [$ o2. Green power indicator LED (D4). 电源指示灯3 S L! r& n) W) V
3. On-board crystal for precision microcontroller clocking (8 MHz) (Y1). 板上晶振; g$ J! g* k3 y% P
4. USB connectivity for on-board debugger communications (J7). 小口USB连接器用于DEBUG
; x4 |8 O* R3 p, i5. Debug indicator LED (D7). Debug指示灯7 m4 ]3 v/ @9 Z k) n' C9 @1 M
6. Three push button switches for user-defined inputs (SW1, SW2, SW3). 3个按键，用户输入+ T4 ?* a& u- h' F: {' u! ~% G- j
7. Three user-defined indicator LEDs (D1, D2, D3). 3个用户指示灯. I/ j" ^, `4 }- c
8. USB Type A receptacle connectivity for PIC32 host-based applications (J4). USB连接器用于用户使用4 W; r( S% b+ ~
9. HOST mode power jumper (J5). 电源模式跳线
N2 n! t; x' x1 ]# z9 ^1 x10. LAN8740A PHY Daughter Board headers (J2) 这个拿到板的人一看就明白,网络连接接口4 \3 S9 D0 k) h# f$ g" h; r
11. 50 MHz Ethernet PHY oscillator (Y3). 50MHZ晶振 没看文档前还以为是电容 . z% M9 ]6 _- R5 w% L, q
12. 32 kHz oscillator (optional) (Y2). 32KHZ晶振
# O" f) o* D1 V13. USB Host and OTG power supply for powering PIC32 USB applications (U4). 用户使用的USB工作芯片。
9 ^) o0 t9 `1 s8 u1 Q) h二．反面：# K9 n; G1 t0 G) x8 v
1. Regulated +3.3V power supply for powering the starter kit through USB or
2 T" R5 G2 _* t; o& y0 H6 U) E- M7 Yexpansion board (U8). 3.3V的电源支撑
( T/ }) I* _! P: _: T' `2.Connector for various expansion boards (J1). 扩展板连接器
% g9 k' X+ \, J5 a3.USB Type micro-AB receptacle for OTG and USB device connectivity for PIC32% n( H, W% u5 [/ d8 K F+ D
OTG/device-based applications (J3). OTG,micro-USB连接器
; u8 d; Q) L+ y6 ^4.PIC24FJ256GB106 USB microcontroller for on-board debugging (U6).usb-debug芯片。! f" r+ n3 ~1 h& y1 p
基本情况就介绍到这儿，这个板子本身所带的资源及信息。
' e$ P: ^4 \; Z0 C6 @" d $ g' ]+ f. T% g2 |5 j( k
=======================================================================================================4 e* |& k4 g, c, T5 b; ]7 P7 D1 g6 x
三．性能及相关参数（捡主要的）( l c0 r9 R- g- y! Y
3.1 power supply
0 R) t1 d- ]- D& ?, n% _) M' M• USB bus power connected to USB debug connector, J7.USB_debug连接器提供* d* F1 C; p4 M& j! P
• 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。3 F" h9 S4 Q3 \' r; S, I
can be connected to the J1 application board connector that is provided on the bottom side of the board.
7 e- w$ O: `8 K3 @! h6 n3.2 PIC32 USB Connectivity（USB连接）: I2 G& x5 N9 V& P0 ]; m, i
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，
0 d& L+ t1 q$ k2 I5 h+ m! }* n还有一种是OTG模式，
4 [. h% j% ^/ F) j' l•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
! q1 j4 e' `7 }8 {. Rjumper 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 e, N0 r. F( J5 u) o j" E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' j3 I) \8 s0 r$ s5 ~, P/ X2 t4 _
在面板上看到的那两个排针。
v+ l0 J+ B; }7 r& i+ P! n u•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
/ }4 q; G! X6 h/ z, V; k; o2 fkit’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
% x o; }; e* X3 s) Sbe removed.
p. M* f n, M8 |6 Y$ jDEBUG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。. Q3 K/ _9 W1 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
2 x9 ^* o. N1 Astarter kit provides an on-board power supply capable of providing 120 mA Max. This supply is controlled by the PIC32MX795F512L microcontroller. Jumper J5 should
! F4 `/ ^. b$ }, x5 A4 d2 }# `" hbe removed.$ d$ a s# u; z5 L1 n
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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