have local stdio.h file to avoid newlib issues
... we should move to -nostdinc at some point :/
diff --git a/firmware/libcommon/include/stdio.h b/firmware/libcommon/include/stdio.h
new file mode 100644
index 0000000..24bf861
--- /dev/null
+++ b/firmware/libcommon/include/stdio.h
@@ -0,0 +1,32 @@
+#pragma once
+#include <stddef.h>
+#include <stdarg.h>
+
+
+#ifndef EOF
+#define EOF (-1)
+#endif
+
+struct File;
+typedef struct File FILE;
+
+extern FILE* const stdin;
+extern FILE* const stdout;
+extern FILE* const stderr;
+
+signed int vsnprintf(char *pStr, size_t length, const char *pFormat, va_list ap);
+signed int snprintf(char *pString, size_t length, const char *pFormat, ...);
+signed int vsprintf(char *pString, const char *pFormat, va_list ap);
+signed int vfprintf(FILE *pStream, const char *pFormat, va_list ap);
+signed int vprintf(const char *pFormat, va_list ap);
+signed int fprintf(FILE *pStream, const char *pFormat, ...);
+signed int printf(const char *pFormat, ...);
+signed int sprintf(char *pStr, const char *pFormat, ...);
+signed int puts(const char *pStr);
+
+
+int fputc(int c, FILE *stream);
+int fputs(const char *s, FILE *stream);
+
+#define putc(c, stream) fputc(c, stream)
+#define putchar(c) fputc(c, stdout)