extend demo with basic C and C++ examples

litex/soc/software/demo/Makefile

@@ -3,7 +3,7 @@ BUILD_DIR?=../build/
 include $(BUILD_DIR)/software/include/generated/variables.mak
 include $(SOC_DIRECTORY)/software/common.mak
 
-OBJECTS=isr.o donut.o main.o
+OBJECTS=isr.o donut.o helloc.o hellocpp.o main.o
 
 all: demo.bin
 
@@ -30,6 +30,12 @@ main.o: main.c
 
 donut.o: CFLAGS += -w
 
+helloc.o: CFLAGS += -w
+
+hellocpp.o: CXXFLAGS += -w
+%.o: %.cpp
+	$(compilexx)
+
 %.o: %.c
 	$(compile)
 

litex/soc/software/demo/helloc.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void helloc(void) {
+  printf("C: Hello, world!\n");
+}

litex/soc/software/demo/hellocpp.cpp

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+extern "C" void hellocpp(void);
+void hellocpp(void)
+{
+    printf("C++: Hello, world!\n");
+}

litex/soc/software/demo/main.c

@@ -87,6 +87,8 @@ static void help(void)
 	puts("led                - Led demo");
 #endif
 	puts("donut              - Spinning Donut demo");
+	puts("helloc             - Hello C");
+	puts("hellocpp           - Hello C++");
 }
 
 /*-----------------------------------------------------------------------*/
@@ -138,6 +140,21 @@ static void donut_cmd(void)
 	donut();
 }
 
+extern void helloc(void);
+
+static void helloc_cmd(void)
+{
+	printf("Hello C demo...\n");
+	helloc();
+}
+
+extern void hellocpp(void);
+
+static void hellocpp_cmd(void)
+{
+	printf("Hello C++ demo...\n");
+	hellocpp();
+}
 /*-----------------------------------------------------------------------*/
 /* Console service / Main                                                */
 /*-----------------------------------------------------------------------*/
@@ -160,6 +177,10 @@ static void console_service(void)
 #endif
 	else if(strcmp(token, "donut") == 0)
 		donut_cmd();
+	else if(strcmp(token, "helloc") == 0)
+		helloc_cmd();
+	else if(strcmp(token, "hellocpp") == 0)
+		hellocpp_cmd();
 	prompt();
 }