47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
// Socket shim — provides rs232-compatible API backed by TCP sockets
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// Used by the Linux proxy to reuse the packet and secLink layers.
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//
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// Design: the packet and secLink layers call rs232Read/rs232Write assuming
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// a real UART underneath. By providing a socket-backed implementation with
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// the same function signatures, we can reuse the entire protocol stack
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// on Linux without any #ifdefs in the packet or secLink code.
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//
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// The #define RS232_H below is intentional: it prevents the real rs232.h
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// from being included if someone includes both headers. The shim only
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// implements the subset of rs232 functions that packet and secLink use
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// (open, close, read, write). Hardware-specific functions (IRQ, FIFO,
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// flow control) are not needed and not provided.
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#ifndef SOCKSHIM_H
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#define SOCKSHIM_H
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// Prevent the real rs232.h from being included alongside this shim
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#define RS232_H
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#include <stdint.h>
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#include <stdbool.h>
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// rs232-compatible constants (subset used by packet and secLink)
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#define RS232_COM1 0
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#define RS232_COM2 1
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#define RS232_COM3 2
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#define RS232_COM4 3
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#define RS232_HANDSHAKE_NONE 0
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#define RS232_SUCCESS 0
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#define RS232_ERR_NOT_OPEN -2
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#define RS232_ERR_INVALID_PORT -5
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// Associate a socket fd with a COM index. Must be called before
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// rs232Open/pktOpen/secLinkOpen. Sets the socket to non-blocking.
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void sockShimSetFd(int com, int fd);
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// rs232-compatible functions backed by TCP sockets
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int rs232Close(int com);
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int rs232Open(int com, int32_t bps, int dataBits, char parity, int stopBits, int handshake);
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int rs232Read(int com, char *data, int len);
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int rs232Write(int com, const char *data, int len);
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#endif
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