Updated debug printing for raspi + added persistent_open setting for raspi spi

include/sta/debug_printf.hpp

@@ -0,0 +1,49 @@
+#ifndef STA_CORE_DEBUG_PRINTF_HPP
+#define STA_CORE_DEBUG_PRINTF_HPP
+
+#include <sta/config.hpp>
+
+// Determine if module should be enabled
+// Condition 1: STA_DEBUG_PRINTF is defined
+// Condition 2:
+//     STA_DEBUG_PRINTF_FORCE is defined
+//   or
+//     DEBUG is defined but not NDEBUG
+#ifdef STA_DEBUG_PRINTF
+#  ifdef STA_DEBUG_PRINTF_FORCE
+#    define STA_DEBUG_SERIAL_ENABLED
+#  else // !STA_DEBUG_PRINTF_FORCE
+#    if defined(DEBUG) && !defined(NDEBUG)
+#      define STA_DEBUG_PRINTF_ENABLED
+#    endif // DEBUG && !NDEBUG
+#  endif // !STA_DEBUG_PRINTF_FORCE
+#endif // STA_DEBUG_PRINTF
+
+#if defined(STA_DEBUG_PRINTF_ENABLED) || defined(DOXYGEN)
+
+#include <sta/printable.hpp>
+
+/**
+ * @brief Print debug output.
+ *
+ * @param ... See @ref sta::PrintableUART::print
+ *
+ * @ingroup sta_core_debug
+ */
+#  define STA_DEBUG_PRINT(...)      sta::print(__VA_ARGS__)
+/**
+ * @brief Print debug output followed by new-line to UART.
+ *
+ * @param ... See @ref sta::PrintableUART::println
+ *
+ * @ingroup sta_core_debug
+ */
+#  define STA_DEBUG_PRINTLN(...)    sta::println(__VA_ARGS__)
+
+
+#else // !STA_DEBUG_PRINTF_ENABLED
+#  define STA_DEBUG_PRINT(...)      ((void)0)
+#  define STA_DEBUG_PRINTLN(...)    ((void)0)
+#endif // !STA_DEBUG_PRINTF_ENABLED
+
+#endif // STA_CORE_DEBUG_PRINTF_HPP