1 files changed, 90 insertions, 0 deletions
diff --git a/flow-native/src/include/flow.h b/flow-native/src/include/flow.h
new file mode 100644
index 0000000..44e2a47
--- /dev/null
+++ b/flow-native/src/include/flow.h
@@ -0,0 +1,90 @@
+#ifndef FLOW_H
+#define FLOW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stddef.h>
+
+//general error codes that are returned by functions
+#define E_IO -1 //IO error
+#define E_ACCESS_DENIED -2 //access denied
+#define E_BUSY -3 // port is busy
+#define E_INVALID_SETTINGS -4 // some port settings are invalid
+#define E_INTERRUPT -5 // not really an error, function call aborted because port is closed
+#define E_NO_PORT -6 //requested port does not exist
+
+#define PARITY_NONE 0
+#define PARITY_ODD 1
+#define PARITY_EVEN 2
+
+/** Contains internal configuration of an open serial port. */
+struct serial_config;
+
+/**Opens a serial port and allocates memory for storing configuration. Note: if this function fails,
+ * any internally allocated resources will be freed.
+ * @param port_name name of port
+ * @param baud baud rate
+ * @param char_size character size of data transmitted through serial device
+ * @param two_stop_bits 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 invalid
+ * @return E_IO on other error */
+int serial_open(
+    const char* port_name,
+    int baud,
+    int char_size,
+    bool two_stop_bits,
+    int parity,
+    struct serial_config** const 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 */
+int serial_close(struct serial_config* const serial);
+
+/**Starts a read from a previously opened serial port. The read is blocking, however it may be
+ * interrupted by calling 'serial_cancel_read' 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 */
+int serial_read(struct serial_config* const serial, char* const buffer, size_t size);
+
+/**Cancels a blocked read call. This function is thread safe, i.e. it may be called from a thread even
+ * while another thread is blocked in a read call.
+ * @param serial_config the serial port to interrupt
+ * @return 0 on success
+ * @return E_IO on error */
+int serial_cancel_read(struct serial_config* const serial);
+
+/**Writes data to a previously opened serial port. Non bocking.
+ * @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 */
+int serial_write(struct serial_config* const serial, char* const data, size_t size);
+
+/**Sets debugging option. If debugging is enabled, detailed error message are printed from method calls. */
+void serial_debug(bool value);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* FLOW_H */