Add dmesg, compilation fixes

libs/core/Makefile

@@ -1,6 +1,6 @@
 include Makefile.inc
 
-COMMON_FLAGS = -W -Wall -Wno-unused-parameter -Ipxtapp -fwrapv -fno-threadsafe-statics -Os
+COMMON_FLAGS = -W -Wall -Wno-unused-parameter -Ipxtapp -fwrapv -fno-threadsafe-statics -Os -mthumb
 CFLAGS = $(COMMON_FLAGS) -std=c99
 CXXFLAGS = $(COMMON_FLAGS) -std=c++11 -fno-rtti -fno-exceptions -fno-unwind-tables
 LDFLAGS = -Wl,--gc-sections -Wl,--sort-common -Wl,--sort-section=alignment
@@ -10,6 +10,7 @@ LD = $(PREF)gcc
 LIBSTDCPP = /usr/lib/gcc/arm-linux-gnueabi/4.9/libstdc++.a
 
 EXE = bld/pxt-app.elf
+HEX = $(EXE:.elf=.hex)
 
 DEPS = $(PXT_HEADERS) package.json Makefile Makefile.inc
 
@@ -19,6 +20,7 @@ $(EXE): $(PXT_OBJS)
 	$(LD) -o $(EXE) $(LDFLAGS) -Wl,-Map,$(EXE:.elf=.map) $(PXT_OBJS) $(LIBSTDCPP) -lm
 	cp $(EXE) $(EXE:.elf=.full)
 	$(PREF)strip $(EXE)
+	node -p 'require("fs").readFileSync("$(EXE)").toString("hex")' > $(HEX)
 	@ls -l $(EXE)
 
 clean:

libs/core/linux.cpp

@@ -4,6 +4,18 @@
 #include <stdio.h>
 #include <sys/time.h>
 #include <time.h>
+#include <cstdarg>
+
+void dmesg(const char *format, ...) {
+    char buf[500];
+
+    va_list arg;
+    va_start(arg, format);
+    vsnprintf(buf, sizeof(buf), format, arg);
+    va_end(arg);
+
+    fprintf(stderr, "DMESG: %s\n", buf);
+}
 
 namespace pxt {
 
@@ -73,5 +85,4 @@ uint32_t afterProgramPage() {
 void dumpDmesg() {
     // TODO
 }
-
 }

libs/core/pxtcore.h

@@ -1,7 +1,7 @@
 #ifndef __PXTCORE_H
 #define __PXTCORE_H
 
-//void codal_dmesg(const char *format, ...);
-#define DMESG(...) /* nothing */
+void dmesg(const char *fmt, ...);
+#define DMESG dmesg
 
 #endif

libs/core/test.ts

@@ -3,9 +3,11 @@ let f = 0.5
 let plus = i + f
 let minus = i - f
 
-let r = Math.random()
-let ri = Math.randomRange(5, 10)
+while (true) {
+    let r = Math.random()
+    serial.writeValue("R", r)
+    loops.pause(1000)
+}
 
-loops.forever(() => {
-    loops.pause(100)
-})
+//loops.forever(() => {
+//})