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參數(shù)資料
型號(hào)： 101-0558
廠商： Rabbit Semiconductor
文件頁(yè)數(shù)： 50/94頁(yè)
文件大?。?/td> 0K
描述： COMPUTER SNG BD BL1800 512K SRAM
標(biāo)準(zhǔn)包裝： 10
系列： SBC
模塊/板類型： 單板計(jì)算機(jī)模塊
適用于相關(guān)產(chǎn)品： BL1800
50
Jackrabbit (BL1800)
used to collect some operations that are helpful to do once on every pass through the loop.
Place the cursor on this function name BigLoopTop() and hit <Ctrl-H> to learn more.
The statement at (3) waits for a time delay, in this case 200 ms. The costatement is being
executed on each pass through the big loop. When a waitfor condition is encountered
the first time, the current value of MS_TIMER is saved and then on each subsequent pass
the saved value is compared to the current value. If a waitfor condition is not encoun-
tered, then a jump is made to the end of the costatement (4), and on the next pass of the
loop, when the execution thread reaches the beginning of the costatement, execution
passes directly to the waitfor statement. Once 200 ms has passed, the statement after the
waitfor is executed. The costatement has the property that it can wait for long periods of
time, but not use a lot of execution time. Each costatement is a little program with its own
statement pointer that advances in response to conditions. On each pass through the big
loop, as little as one statement in the costatement is executed, starting at the current posi-
tion of the costatement’s statement pointer. Consult the Dynamic C User’s Manual for
more details.
The second costatement in the program debounces the switch and maintains the variable
vswitch
. Debouncing is performed by making sure that the switch is either on or off for a
long enough period of time to ensure that high-frequency electrical hash generated when
the switch contacts open or close does not affect the state of the switch. The abort state-
ment is illustrated at (5). If executed, the internal statement pointer is set back to the first
statement within the costatement, and a jump to the closing brace of the costatement is
made.
At (6) a use for a shadow register is illustrated. A shadow register is used to keep track of
the contents of an I/O port that is write only - it can’t be read back. If every time a write is
made to the port the same bits are set in the shadow register, then the shadow register has
the same data as the port register. In this case a test is made to see the state of the LED and
make it agree with the state of vswitch. This test is not strictly necessary, the output regis-
ter could be set every time to agree with vswitch, but it is placed here to illustrate the
concept of a shadow register.
To illustrate the use of snooping, use the watch window to observe vswitch while the
program is running. Add the variable vswitch to the list of watch expressions. Then tog-
gle vswitch and the LED. Then type <Ctrl-U> to observe vswitch again.
4.3.1 Advantages of Cooperative Multitasking
Cooperative multitasking, as implemented with language extensions, has the advantage of
being intuitive. Unlike preemptive multitasking, variables can be shared between different
tasks without having to take elaborate precautions. Sharing variables between tasks is the
greatest cause of bugs in programs that use preemptive multitasking. It might seem that
the biggest problem would be response time because of the big loop time becoming long
as the program grows. Our solution for that is a device caused slicing that is further
described in the Dynamic C User’s Manual.
相關(guān)PDF資料
PDF描述
396-036-526-204 CARD EDGE 36POS DL .125X.250 BLK
396-036-526-202 CARD EDGE 36POS DL .125X.250 BLK
101-0411 INTERFACE 12KEYDISP ETHNT OP6700
AT24C02A-10PI-2.7 IC EEPROM 2KBIT 400KHZ 8DIP
AT24C02A-10PI-1.8 IC EEPROM 2KBIT 400KHZ 8DIP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
10105584 制造商:Amphenol Corporation 功能描述:10-341374-222 - Bulk
101055OO 制造商:TE Connectivity 功能描述:
101056084S 制造商:Amphenol Aerospace 功能描述:CONNECTOR
101-0561 功能描述:模塊化系統(tǒng) - SOM RCM3400 RABBITCORE RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
10-105610-02S 制造商:Amphenol Aerospace 功能描述:PLUG
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