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package com.github.jodersky.flow.internal;
import com.github.jodersky.flow.internal.NativeLoader;
/** Thin layer on top of native code. */
class NativeSerial {
static {
NativeLoader.load();
}
final static int E_IO = -1;
final static int E_ACCESS_DENIED = -2;
final static int E_BUSY = -3;
final static int E_INVALID_SETTINGS = -4;
final static int E_INTERRUPT = -5;
final static int E_NO_PORT = -6;
final static int PARITY_NONE = 0;
final static int PARITY_ODD = 1;
final static int PARITY_EVEN = 2;
/**Opens a serial port and allocates memory for storing configuration. Note: if this function fails,
* any internally allocated resources will be freed.
* @param device name of port
* @param baud baud rate
* @param characterSize character size of data transmitted through serial device
* @param twoStopBits set to use two stop bits instead of one
* @param parity kind of parity checking to use
* @param serial pointer to memory that will be allocated with a serial structure
* @return 0 on success
* @return E_NO_PORT if the given port does not exist
* @return E_ACCESS_DENIED if permissions are not sufficient to open port
* @return E_BUSY if port is already in use
* @return E_INVALID_SETTINGS if any of the specified settings are not supported
* @return E_IO on other error */
native static int open(String device, int baud, int characterSize, boolean twoStopBits, int parity, long[] serial);
/**Starts a blocking read from a previously opened serial port. The read is blocking, however it may be
* interrupted by calling 'serial_interrupt' on the given serial port.
* @param serial pointer to serial configuration from which to read
* @param buffer buffer into which data is read
* @param size maximum buffer size
* @return n>0 the number of bytes read into buffer
* @return E_INTERRUPT if the call to this function was interrupted
* @return E_IO on IO error */
native static int read(long serial, byte[] buffer);
/**Writes data to a previously opened serial port.
* @param serial pointer to serial configuration to which to write
* @param data data to write
* @param size number of bytes to write from data
* @return n>0 the number of bytes written
* @return E_IO on IO error */
native static int write(long serial, byte[] buffer);
/**Interrupts a blocked read call.
* @param serial_config the serial port to interrupt
* @return 0 on success
* @return E_IO on error */
native static int interrupt(long serial);
/**Closes a previously opened serial port and frees memory containing the configuration. Note: after a call to
* this function, the 'serial' pointer will become invalid, make sure you only call it once. This function is NOT
* thread safe, make sure no read or write is in prgress when this function is called (the reason is that per
* close manual page, close should not be called on a file descriptor that is in use by another thread).
* @param serial pointer to serial configuration that is to be closed (and freed)
* @return 0 on success
* @return E_IO on error */
native static int close(long serial);
/**Sets debugging option. If debugging is enabled, detailed error message are printed from method calls. */
native static void debug(boolean value);
}
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