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参数资料
型号： 101-1226
厂商： Rabbit Semiconductor
文件页数： 166/168页
文件大小： 0K
描述： RCM3900 DEV KIT UNIVERSAL
标准包装： 1
系列： RabbitCore 3900
类型： MPU 模块
适用于相关产品： RCM3900
所含物品： RabbitCore 模块、开发板、交流适配器、缆线和 Dynamic C? 光盘
其它名称： 316-1137
RabbitCore RCM3900 User’s Manual
97
B.4.6.1 RS-232
RS-232 serial communication on the Prototyping Board is supported by an RS-232 trans-
ceiver installed at U9. This transceiver provides the voltage output, slew rate, and input
voltage immunity required to meet the RS-232 serial communication protocol. Basically,
the chip translates the Rabbit 3000’s signals to RS-232 signal levels. Note that the polarity
is reversed in an RS-232 circuit so that a +5 V output becomes approximately -10 V and 0
V is output as +10 V. The RS-232 transceiver also provides the proper line loading for
reliable communication.
RS-232 can be used effectively at the RCM3900 module’s maximum baud rate for distances
of up to 15 m.
RS-232 flow control on an RS-232 port is initiated in software using the
serXflowcontrolOn()
function call from the LIB\RS232.LIB, where X is the serial
port (E or F). The locations of the flow control lines are specified using a set of five macros.
SERX_RTS_PORT
—Data register for the parallel port that the RTS line is on (e.g., PGDR).
SERX_RTS_SHADOW
—Shadow register for the RTS line's parallel port (e.g., PGDRShadow).
SERX_RTS_BIT
—The bit number for the RTS line.
SERX_CTS_PORT
—Data register for the parallel port that the CTS line is on (e.g., PCDRShadow).
SERX_CTS_BIT
—The bit number for the CTS line.
Standard 3-wire RS-232 communication using Serial Ports E and F is illustrated in the fol-
lowing sample code.
#define EINBUFSIZE
15
// set size of circular buffers in bytes
#define EOUTBUFSIZE 15
#define FINBUFSIZE
15
#define FOUTBUFSIZE 15
#define MYBAUD 115200
// set baud rate
#endif
main(){
serEopen(_MYBAUD);
// open Serial Ports E and F
serFopen(_MYBAUD);
serEwrFlush();
// flush their input and transmit buffers
serErdFlush();
serFwrFlush();
serFrdFlush();
serEclose(_MYBAUD);
// close Serial Ports C and D
serFclose(_MYBAUD);
}
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