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| 型号： | DM164127 |
| 厂商： | Microchip Technology |
| 文件页数： | 27/54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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FIGURE 2-5:
STATE DIAGRAM FOR KEYBOARD()
delaycounter < 9000
STATE
0
delaycounter > 9000
STATE
1
STATE
Start ADC Conversion
(Set the GO_DONE bit
While GO_DONE = 1
(ADC Conversion in Progress)
2
GO_DONE = 0 (Cleared in Hardware)
STATE
3
? Read ADC result register
? Load HID buffer
? Transmit HID buffer contents along USB
Referring to the state diagram, the individual states perform these general tasks:
1. STATE 0: this is a delay state used to ensure that the hold capacitor on the ADC
peripheral has sufficient time to charge before a conversion is initiated.
2. STATE 1: this state begins the conversion process by setting the GO_DONE bit
in the ADCON0 control register.
3. STATE 2: checks for a completed conversion (GO_DONE = 0 ) before allowing
the state machine to move to the next state.
4. STATE 3: this final state reads the ADC result register, converts the result to a
value between 4 (‘a’) and 29 (‘z’), loads a HID buffer and transmits the resulting
data along the USB to the Host PC for output to an opened .txt document.
The main point the user should take away from this lab is this: since the USB Frame-
work is a multitasking environment, no blocking code should be used. Therefore, as
shown in this lab, state machines will become the norm in many applications. The
keyboard() state machine is called each time through the main loop. If the condition
that changes the current state to the next state is not met, the state machine simply
returns from the function without changing states. The next time through the main
loop, the condition is once again checked. If the state condition has been met, the
state is changed to the next sequential state. The state variable is declared as a type
static as this will allow the current value in the state variable to remain after a return
from the keyboard() .
? 2009 Microchip Technology Inc.
DS41356B-page 23
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