[examples] Add TLSF allocator example.

examples/stm32f469_discovery/tlsf-allocator/SConstruct

@@ -0,0 +1,4 @@
+# path to the xpcc root directory
+xpccpath = '../../..'
+# execute the common SConstruct file
+execfile(xpccpath + '/scons/SConstruct')

examples/stm32f469_discovery/tlsf-allocator/main.cpp

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+#include <xpcc/architecture/platform.hpp>
+#include <tlsf.h>
+
+extern tlsf_t tlsf_heap0;
+extern uint32_t __heap1_start;
+
+int main()
+{
+	Board::initialize();
+	Board::Leds::setOutput();
+
+	// 200 pointers to allocated memories
+	void *d[200];
+	int free_ii = 0;
+
+	for (int ii=0; ii < 200; ii++)
+	{
+		d[ii] = nullptr;
+		uint32_t size = rand() % (1024*20);
+
+		if ((rand() % 100) >= 75) {
+			d[ii] = tlsf_malloc(tlsf_heap0, size);
+			// explicit allocation in CCM
+			XPCC_LOG_INFO << ".heap0  ";
+		} else {
+			d[ii] = malloc(size);
+			if (d[ii] && d[ii] < &__heap1_start) {
+				// allocation on SRAM has failed and fallback uses CCM!
+				XPCC_LOG_INFO << ".heap0FB";
+			}
+			else XPCC_LOG_INFO << ".heap123";
+		}
+
+		// print what size we requested and if it succeeded
+		XPCC_LOG_INFO.printf(" malloc(%2ukB) = ", size/1024);
+		if (d[ii]) XPCC_LOG_INFO << d[ii];
+		else   XPCC_LOG_INFO << "NO MEMORY ";
+
+		if ((rand() % 100) >= 50) {
+			// only some memory is returned to the system
+			void* df = d[free_ii++];
+			XPCC_LOG_INFO << "  ...freeing " << df;
+			free(df);
+		}
+		XPCC_LOG_INFO << xpcc::endl;
+	}
+
+	while (1)
+	{
+		Board::Leds::toggle();
+		xpcc::delayMilliseconds(500);
+	}
+	return 0;
+}

examples/stm32f469_discovery/tlsf-allocator/project.cfg

@@ -0,0 +1,6 @@
+[build]
+board = stm32f469_discovery
+buildpath = ${xpccpath}/build/stm32f469_discovery/${name}
+
+[parameters]
+uart.stm32.3.tx_buffer = 2048