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| 型号： | DM164127 |
| 厂商： | Microchip Technology |
| 文件页数： | 26/54页 |
| 文件大小： | 0K |
| 描述： | KIT DEVELOPMENT USB 18F14/13K50 |
| 标准包装： | 1 |
| 主要目的： | 接口，USB 2.0 从 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | PIC18F13K50，PIC18F14K50 |
| 主要属性： | 全速（12Mbps），基于 MCU |
| 次要属性： | 4 实验室：枚举，HID 鼠标，HID 键盘，CDC 串行仿真器 |
| 已供物品： | 3 块板，电缆，CD，连接器 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | PIC18F14K50-I/MQ-ND - IC PIC MCU FLASH 768KX16 20-QFN PIC18F13K50-I/MQ-ND - IC PIC MCU FLASH 512KX8 20-QFN PIC18F13K50T-I/SS-ND - IC PIC MCU FLASH 8KB 20-SSOP PIC18F13K50T-I/SO-ND - IC PIC MCU FLASH 8KB 20-SOIC PIC18F13K50-I/SO-ND - IC PIC MCU FLASH 8K 1.8V 20-SOIC PIC18F13K50-I/SS-ND - IC PIC MCU FLASH 8KB 20-SSOP PIC18F13K50-I/P-ND - IC PIC MCU FLASH 4KX16 20-PDIP PIC18F14K50T-I/SS-ND - IC PIC MCU FLASH 8KX8 20-SSOP PIC18F14K50T-I/SO-ND - IC PIC MCU FLASH 8KX8 20-SOIC PIC18F14K50-I/SS-ND - IC PIC MCU FLASH 8KX16 20-SSOP 更多... |
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Low Pin Count USB Development Kit User’s Guide
12. Disconnect the PICkit 2 and connect the Low Pin Count USB Demo Board to the
Host PC port.
13. The device should enumerate and the LEDs on the board flash in accordance
with the BlinkUSBStatus() discussed in the self-directed course.
14. Pressing the push button should start and subsequently stop the mouse pointer
moving in a circle on the Host PC screen.
The user is encouraged to experiment with this application by altering the length of time
that the mouse pointer moves until a directional change or altering the values in the
ROM signed char dir_table[]={-4,-4,-4, 0, 4, 4, 4, 0} ;
2.6
PROJECT LAB 3 (HID KEYBOARD)
CAUTION
CAUTION
A word of caution, this HID device has the potential to be harmful if a key combination
is used that initiates a Windows ? shortcut. Great care should be taken to ensure that
the transmitting buffer contains only keycodes that the user is confident will not
produce any harmful key combinations.
In this lab, the PIC18F14K50 is implemented as a HID keyboard device. The ADC
peripheral is configured to perform conversions on the voltage level present on the port
pin connected to the potentiometer on the Low Pin Count USB Development Board.
The value in the ADC result register is then used to create a numeric value between 4
and 29 that will display an alphabetic character between ‘a’ and ‘z’ on the Host PC
screen (refer to HID Usage Tables document Section 10 “Keyboard/Keypad Page”
( 0x07 )). As the potentiometer is rotated, the character outputted to the screen will
change accordingly. The user should note that this application could be applied to a
data logger application with the potentiometer on the Low Pin Count USB Development
Board simulating a mixed signal interface to monitor an off-chip application. The data
generated and transmitted via the USB could be connected and interpreted by a
Graphical User Interface on the Host PC to monitor real-time application behavior or
used to store essential data for later analysis.
2.6.1
Overview of the HID Keyboard Firmware
The keyboard() is the user-defined function that is called from ProcessIO() to
parse the data received from the ADC module, transmit the numeric value along the
USB and display the appropriate character on the screen. This function is implemented
DS41356B-page 22
? 2009 Microchip Technology Inc.
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