CONFIG PRINT
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<span class="f_Syntax">CONFIG PRINT3</span> = pin | <span class="f_Syntax">CONFIG PRINT3</span> = pin | ||
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| + | <span class="f_Syntax">CONFIG PRINT5</span> = pin | ||
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| + | <span class="f_Syntax">CONFIG PRINT6</span> = pin | ||
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| + | <span class="f_Syntax" style="font-size: 10pt;">CONFIG PRINT7</span><span style="font-size: 10pt;"> = pin</span><span style="font-family: Arial;"> </span> | ||
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CONFIG PRINT will not work with dynamic Xmega UARTS (BUART). You need to use a constant channel with the Xmega like PRINTBIN #1. | CONFIG PRINT will not work with dynamic Xmega UARTS (BUART). You need to use a constant channel with the Xmega like PRINTBIN #1. | ||
| − | CONFIG PRINT will | + | CONFIG PRINT will does not work with buffered serial output. |
<span style="font-family: Arial;"> </span> | <span style="font-family: Arial;"> </span> | ||
Revision as of 15:06, 4 February 2014
Contents |
Action
Configure the UART to be used for RS-485
Syntax
CONFIG PRINT0 = pin
CONFIG PRINT1 = pin
CONFIG PRINT2 = pin
CONFIG PRINT3 = pin
CONFIG PRINT4 = pin
CONFIG PRINT5 = pin
CONFIG PRINT6 = pin
CONFIG PRINT7 = pin
Remarks
|
pin |
The name of the PORT pin that is used to control the direction of an RS-485 driver. |
|
mode |
SET or RESET |
Use PRINT or PRINT0 for the first serial port. Use PRINT1 for the second serial port. PRINT2 for the third UART and PRINT3 for the fourth UART.
When you use RS-485 half duplex communication you need a pin for the direction of the data. The CONFIG PRINT automates the manual setting/resetting. It will either SET or RESET the logic level of the specified pin before data is printed with the BASCOM print routines. After the data is sent, it will inverse the pin so it goes into receive mode.
You need to set the direction of the used pin to output mode yourself.
When CONFIG PRINT is used, the PRINT and PRINTBIN statements will switch the pin logic level, send the data, wait till all data is sent, and then will switch the pin logic level back.
CONFIG PRINT will not work with dynamic Xmega UARTS (BUART). You need to use a constant channel with the Xmega like PRINTBIN #1.
CONFIG PRINT will does not work with buffered serial output.
See also
Example
'------------------------------------------------------------------------------ 'name : rs485.bas 'copyright : (c) 1995-2006, MCS Electronics 'purpose : demonstrates 'micro : Mega48 'suited for demo : yes 'commercial addon needed : no '------------------------------------------------------------------------------ $regfile = "m48def.dat" ' we use the M48 $crystal = 8000000 $baud = 19200 $hwstack = 32 $swstack = 32 $framesize = 32 Config Print0 = Portb.0 , Mode = Set Config Pinb.0 = Output 'set the direction yourself Dim Resp As String * 10 Do Print "test message" Input Resp ' get response Loop
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