CLEAR
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SERIALIN4 - COM4/UART3 input buffer | SERIALIN4 - COM4/UART3 input buffer | ||
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| + | SERIALIN5 - COM5/UART4 input buffer | ||
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| + | SERIALIN6 - COM6/UART5 input buffer | ||
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| + | SERIALIN7 - COM7/UART6 input buffer | ||
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| + | SERIALIN8 - COM8/UART7 input buffer | ||
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SERIALOUT3 - COM4/UART3 output buffer | SERIALOUT3 - COM4/UART3 output buffer | ||
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| + | SERIALOUT4 - COM5/UART4 output buffer | ||
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| + | SERIALOUT5 - COM6/UART5 output buffer | ||
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| + | SERIALOUT6 - COM7/UART6 output buffer | ||
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| + | SERIALOUT7 - COM8/UART7 output buffer | ||
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Latest revision as of 11:46, 24 August 2013
Contents |
Action
Clear serial input or output buffer
Syntax
CLEAR bufname
Remarks
|
Bufname |
Serial buffer name to clear.
SERIALIN, SERIALIN0 - COM1/UART0 input buffer SERIALIN2 - COM2/UART1 input buffer SERIALIN3 - COM3/UART2 input buffer SERIALIN4 - COM4/UART3 input buffer SERIALIN5 - COM5/UART4 input buffer SERIALIN6 - COM6/UART5 input buffer SERIALIN7 - COM7/UART6 input buffer SERIALIN8 - COM8/UART7 input buffer
SERIALOUT,SERIALOUT0 - COM1/UART0 output buffer SERIALOUT1 - COM2/UART1 output buffer SERIALOUT2 - COM3/UART2 output buffer SERIALOUT3 - COM4/UART3 output buffer SERIALOUT4 - COM5/UART4 output buffer SERIALOUT5 - COM6/UART5 output buffer SERIALOUT6 - COM7/UART6 output buffer SERIALOUT7 - COM8/UART7 output buffer |
When you use buffered serial input or buffered serial output, you might want to clear the buffer.
While you can make the head pointer equal to the tail pointer, an interrupt could be active which might result in an update of the buffer variables, resulting in an unexpected result.
The CLEAR statement will reset the head and tail pointers of the ring buffer, and it will set the buffer count variable to 0. The buffer count variable is new and introduced in 1.11.8.3. It counts how many bytes are in the buffer.
The internal buffercount variable is named _RS_BUFCOUNTxy , where X is R for Receive, and W for Write, and y is 0 for the first UART, and 1 for the second UART.
See also
CONFIG SERIALIN , CONFIG SERIALOUT
ASM
Calls _BUF_CLEAR from MCS.LIB
Example
CLEAR SERIALIN| Languages | English • Deutsch |
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