WIP Implement modm_abandon for AVR

src/modm/board/mega_2560_pro/board_serial.cpp

@@ -20,3 +20,33 @@ modm::log::Logger modm::log::debug(loggerDevice);
 modm::log::Logger modm::log::info(loggerDevice);
 modm::log::Logger modm::log::warning(loggerDevice);
 modm::log::Logger modm::log::error(loggerDevice);
+
+#include <modm/architecture/interface/accessor.hpp>
+
+modm_extern_c void
+modm_abandon(const modm::AssertionInfo &info)
+{
+	MODM_LOG_ERROR << IFSS("Assertion '") << modm::accessor::asFlash(info.name) << IFSS("'");
+	if (info.context != uintptr_t(-1)) {
+		MODM_LOG_ERROR << IFSS(" @ ") << (void *) info.context <<
+						 IFSS(" (") << (uint32_t) info.context << IFSS(")");
+	}
+	#if MODM_ASSERTION_INFO_HAS_DESCRIPTION
+	MODM_LOG_ERROR << IFSS(" failed!\n  ") << modm::accessor::asFlash(info.description) << IFSS("\nAbandoning...\n");
+	#else
+	MODM_LOG_ERROR << IFSS(" failed!\nAbandoning...\n");
+	#endif
+
+	Board::Leds::setOutput();
+	for(int times=10; times>=0; times--)
+	{
+		Board::Leds::write(1);
+		modm::delay_ms(20);
+		Board::Leds::write(0);
+		modm::delay_ms(180);
+	}
+	// Do not flush here otherwise you may deadlock due to waiting on the UART
+	// interrupt which may never be executed when abandoning in a higher
+	// priority Interrupt!!!
+	// MODM_LOG_ERROR << modm::flush;
+}