参数资料
| 型号： | 101-0454 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 16/90页 |
| 文件大小： | 0K |
| 描述： | MODULE RABBITCORE RCM2200 |
| 标准包装： | 50 |
| 系列： | RabbitCore® |
| 模块/板类型： | MPU 核心模块 |
| 适用于相关产品： | RCM2200 |
| 其它名称： | 1010454 316-1013 Q1130258 RCM2200 RCM2200-ND |
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User’s Manual
17
3.1.4.2 FLASHLEDS.C
In addition to Dynamic C’s implementation of C-language programming for embedded
systems, it supports assembly-language programming for very efficient processor-level
control of the module hardware and program flow. This application is similar to
FLASHLED.C
and TOGGLELED.C, but uses assembly language for the low-level port con-
trol within cofunctions, another powerful multitasking tool.
Dynamic C permits the use of assembly language statements within C code. This program
creates three functions using assembly language statements, then creates a C cofunction to
call two of them. That cofunction is then called within main().
Within each of the C-like functions, the #asm and #endasm directives are used to indicate
the beginning and end of the assembly language statements.
In the function initialize_ports( ), port A is initialized to be all outputs while bit 0
of port E is initialized to be an output.
In the function ledon(), a 0 is written to the port A bit corresponding to the desired LED
(0, which equals DS3, or 1 which equals DS4), turning that LED on. The ledoff( )
function works exactly the same way except that a 1 is written to the bit, turning the
selected LED off.
Finally, in the cofunction flashled(), the LED to be flashed, the on time in millisec-
onds, and the off time in milliseconds are passed as arguments. This function uses an end-
less for(;;) loop to call the ledon() and ledoff() functions, separated by calls to
the wait function DelayMs(). This sequence will make the indicated LED flash on and
off.
As is proper in C program design, the contents of main() are almost trivial. The program
first calls initialize_ports(), then begins an endless for(;;) loop. Within this
loop, the program:
1. Calls the library function hitwd(), which resets the microprocessor’s watchdog timer.
(If the watchdog timer is not reset every so often, it will force a hard reset of the sys-
tem. The purpose is to keep an intermittent program or hardware fault from locking up
the system. Normally, this function is taken care of by the virtual driver, but it is called
explicitly here).
2. Sets up a costatement which calls two instances of the flashled() function, one for
each LED. Note that one LED is flashed one second on, one-half second (500 ms) off,
while the other is flashed in the reverse pattern.
Note also the wfd keyword in the costatement. This keyword (an abbreviation for wait-
fordone
, which can also be used) must be used when calling cofunctions. For a complete
explanation, see Section 5 and 6 in the Dynamic C User’s Manual.
More Information
See the entries for the hitwd() and DelayMs() functions in the Dynamic C User’s
Manual, as well as those for the directives #asm and #endasm. For a complete explana-
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB321B-CC | IC FLASH 32MBIT 20MHZ 44CBGA |
| AT45DB161B-TC | IC FLASH 16MBIT 20MHZ 28TSOP |
| AT45DB161B-RI | IC FLASH 16MBIT 20MHZ 28SOIC |
| 101-0434 | MODULE RABBITCORE RCM2100 |
| AT45DB161B-RC | IC FLASH 16MBIT 20MHZ 28SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 101-0455 | 功能描述:单板计算机 BL2010 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 |
| 10104558-G0250YYLF | 制造商:FCI 功能描述: |
| 101-0456 | 功能描述:单板计算机 BL2020 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 |
| 101-0457 | 功能描述:单板计算机 BL2030 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 |
| 101-0458 | 功能描述:开发板和工具包 - 其他处理器 RCM2200 PROTO BOARD RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
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