uart_ow: add ow specific context and store search state there

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/mraa/uart_ow.h

@@ -62,9 +62,17 @@ extern "C" {
 #include <stdio.h>
 
 #include "common.h"
+#include "uart.h"
 
 /* for now, we simply use the normal MRAA UART context */
-typedef struct _uart* mraa_uart_ow_context;
+typedef struct _mraa_uart_ow {
+    mraa_uart_context uart;
+    /* search state */
+    unsigned char ROM_NO[8]; /* 8 byte (64b) rom code */
+    int LastDiscrepancy;
+    int LastFamilyDiscrepancy;
+    mraa_boolean_t LastDeviceFlag;
+} *mraa_uart_ow_context;
 
 /* 8 bytes (64 bits) for a device rom code */
 static const int MRAA_UART_OW_ROMCODE_SIZE = 8;