diff -r 995557380e5f -r acc1904cd70d components/esp32-owb/include/owb_rmt_bus_symbols.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/esp32-owb/include/owb_rmt_bus_symbols.h	Tue Sep 26 14:57:18 2023 +0200
@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2023 mjcross
+ *
+ * SPDX-License-Identifier: MIT
+**/
+
+#include "owb_rmt_bus_timings.h"
+
+// RMT transmit channel symbols for the onewire bus signals and conditions
+//
+
+// basic bus levels
+// ----------------
+// note: we configure the transmit channel to be hardware inverted,
+//       so that the bus initialises in the 'released' state
+#define OWB_RMT_BUS_ASSERTED 1
+#define OWB_RMT_BUS_RELEASED 0
+
+// bus symbols as `rmt_symbol_word_t`
+// ----------------------------------
+
+// send 'zero' bit
+#define OWB_RMT_SYMBOL_0BIT { \
+    .level0 = OWB_RMT_BUS_ASSERTED, \
+    .duration0 = OWB_TIMING_PARAM_C, \
+    .level1 = OWB_RMT_BUS_RELEASED, \
+    .duration1 = OWB_TIMING_PARAM_D }
+
+// send 'one' bit
+#define OWB_RMT_SYMBOL_1BIT { \
+    .level0 = OWB_RMT_BUS_ASSERTED, \
+    .duration0 = OWB_TIMING_PARAM_A, \
+    .level1 = OWB_RMT_BUS_RELEASED, \
+    .duration1 = OWB_TIMING_PARAM_B }
+
+// send bus reset 
+#define OWB_RMT_SYMBOL_RESET { \
+    .level0 = OWB_RMT_BUS_ASSERTED, \
+    .duration0 = OWB_TIMING_PARAM_H, \
+    .level1 = OWB_RMT_BUS_RELEASED, \
+    .duration1 = OWB_TIMING_PARAM_I + OWB_TIMING_PARAM_J }
+