参数资料
| 型号： | 101-0814 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 50/94页 |
| 文件大小： | 0K |
| 描述： | COMPUTER SNG BD BL1810 512K SRAM |
| 标准包装： | 10 |
| 系列： | SBC |
| 模块/板类型： | 单板计算机模块 |
| 适用于相关产品： | BL1810 |
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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.
相关PDF资料 |
PDF描述 |
|---|---|
| 101-1007 | MODULE POWERCORE FLEX 3810 |
| 101-1028 | MODULE RABBITCORE RCM3750 |
| 101-1087 | MODULE RABBITCORE RCM 3365 |
| 1B31AN | IC SIGNAL COND STRAIN GAGE 28DIP |
| 1B32AN | IC SIGNAL COND HYBRID 28-DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 101-0815 | 功能描述:单板计算机 SR9100 512K SRAM RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm |
| 101-0816 | 功能描述:KIT DEV RABBITCORE TCP/IP 2000 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:* 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
| 101-0817 | 功能描述:单板计算机 BL2030 512K SRAM RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm |
| 101-0818 | 功能描述:单板计算机 BL2100 Fric Lk 512K RoHS:否 制造商:Ampro By ADLINK 外观尺寸:EPIC 处理器类型:Intel Atom D510 频率:1.66 GHz 存储容量:2 GB (max) 存储类型:DDR2, L2 Cache 接口类型:Ethernet, PS/2, SATA, Serial, USB 工作电源电压:5 V, 12 V 功耗:13 W 最大工作温度:+ 70 C 尺寸:165.1 mm x 114.3 mm |
| 101-0820 | 功能描述:COMPUTER SGL-BD BL2000 SRAM/FLSH RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器或微处理器模块 系列:SBC 产品目录绘图:DLP-245SY-G 标准包装:1 系列:USB 模块/板类型:开发板 适用于相关产品:USB 其它名称:813-1006 |
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