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板载资源介绍, _/ D1 |# y& ^
一．正面：- d0 Q" ~. Y. _; S$ @
官方原文指导：
1 ^- X! K9 o& {The top assembly of the board includes these key features, as indicated in Figure 1-1:
: Z6 l: X/ R: R$ J$ a; e1. PIC32MX795F512L 32-bit microcontroller (U2). 核心的东西+ P1 I' B7 U- o. q) m( q8 t
2. Green power indicator LED (D4). 电源指示灯
8 \! S' v+ _+ @$ ]. m3. On-board crystal for precision microcontroller clocking (8 MHz) (Y1). 板上晶振# w: F7 x. F: c! ]. X0 d5 z, ^8 ?
4. USB connectivity for on-board debugger communications (J7). 小口USB连接器用于DEBUG7 q: W) R ^% \6 U9 L" r+ w
5. Debug indicator LED (D7). Debug指示灯
9 m! v+ O9 u! v B! ]6. Three push button switches for user-defined inputs (SW1, SW2, SW3). 3个按键，用户输入
2 G2 g: ~+ x9 o4 e+ D" c; M# [0 I7. Three user-defined indicator LEDs (D1, D2, D3). 3个用户指示灯7 v7 n) T1 J4 z$ |8 E9 d( E
8. USB Type A receptacle connectivity for PIC32 host-based applications (J4). USB连接器用于用户使用1 v6 u# C, K+ Z, U$ Q2 o9 j2 ~
9. HOST mode power jumper (J5). 电源模式跳线2 {9 W& f; e4 ]$ Y0 E" t 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9 c; ]6 J& y1 P, O! q" T
11. 50 MHz Ethernet PHY oscillator (Y3). 50MHZ晶振 没看文档前还以为是电容
: y! n- v0 r8 Z3 t2 @ b* S0 B( S12. 32 kHz oscillator (optional) (Y2). 32KHZ晶振6 i% |9 B ` J. u
13. USB Host and OTG power supply for powering PIC32 USB applications (U4). 用户使用的USB工作芯片。
+ b( F+ ^& i8 k二．反面：
/ N. q# r3 c+ X. M' e/ m( |/ B* C( a1. Regulated +3.3V power supply for powering the starter kit through USB or! U0 X9 u& r% [, s
expansion board (U8). 3.3V的电源支撑4 ?) P+ |7 C2 [( M$ K/ M
2.Connector for various expansion boards (J1). 扩展板连接器$ }+ |5 k, P7 ]; A& P
3.USB Type micro-AB receptacle for OTG and USB device connectivity for PIC32
/ M: h+ ~3 b+ d% f3 QOTG/device-based applications (J3). OTG,micro-USB连接器
9 o0 q- w8 g$ m" f' f3 z. c4.PIC24FJ256GB106 USB microcontroller for on-board debugging (U6).usb-debug芯片。
. t* P) H! ]+ 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。
# @$ [# Q4 U$ f6 `
5 P2 z5 J7 ~( x5 U( R0 ?' h=======================================================================================================
" d5 c( W' @6 h三．性能及相关参数（捡主要的）
. |; `" d, H- c5 C/ V, @3.1 power supply! p4 p3 k* ?6 z
• USB bus power connected to USB debug connector, J7.USB_debug连接器提供
: p F6 B! Y T# Q7 i1 e0 g' _• 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。5 T/ D0 h$ }: ]9 ]6 _' o
can be connected to the J1 application board connector that is provided on the bottom side of the board.3 x% N( C' S Y# A5 Z# B& D
3.2 PIC32 USB Connectivity（USB连接）& ?; G% m: x1 h/ L- J
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 U/ C. J" m, u- z. Y2 ]! G
还有一种是OTG模式，
. [& b8 |6 x& u•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, install5 w% w" S$ |% p7 q
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.
+ `. w. B/ X( U3 U% G! L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2 L3 t" P5 G* s7 ^
在面板上看到的那两个排针。0 Z% h; j9 D# l' x/ s& D
•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
0 \* D9 ]4 [& R) @9 m& Ckit’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
# M4 w5 T" z' E2 y; Mbe removed.
+ a0 m' c E2 S) L e" FDEBUG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。* p+ b9 J1 x) i9 Q
•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
" o# C9 b- y3 Z/ E# X8 Qstarter kit provides an on-board power supply capable of providing 120 mA Max. This supply is controlled by the PIC32MX795F512L microcontroller. Jumper J5 should1 p+ h$ L- c# u! \8 X) Z
be removed./ j/ N" w1 R }2 a; j3 u
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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