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On Thu, 14 Jan 2010 04:47:53 +0100 |
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Peter Stuge wrote: |
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> Daniel Stonier wrote: |
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> > there's a setting in the termios options structure for rts - have |
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> > you tried that? |
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> > |
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> > 'man termios' - look for CRTSCTS. |
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> |
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> Note that this flag does not directly control RTS, but rather it |
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> instructs the kernel whether RTS/CTS signalling should be used for |
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> flow control or not. |
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> |
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> As David noticed, there is no API for directly controlling RTS in |
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> Linux, it can only be done by the serial driver itself or a line |
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> discipline driver. |
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> |
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> |
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> //Peter |
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Hello Peter and Daniel, |
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Information greatly appreciated. I'll digest it tomorrow when I'm more |
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alert. |
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After bashing my head against the wall (including experimentation with |
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CRTSCTS), I spent a while reading drivers/serial/8250.c and found that |
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CRTSCTS used only for enabling AFE (automatic flowcontrol enabled). |
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Not having adequate specs for the protocol or hardware involved, |
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there's some mystery as to exactly why RTS is used as it is. |
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For certain, it'll be interesting tomorrow to learn more of termios and |
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line discipline drivers (a new term for me). |
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Ciao, |
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David |
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