initial commit

port/picolibc/port.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <sys/types.h>
+
+extern void uart_putc(char c);
+extern int uart_getc(void);
+
+static int
+board_putc(char c, FILE *file)
+{
+	(void) file;		/* Not used in this function */
+	uart_putc(c);		/* Defined by underlying system */
+	return c;
+}
+
+static int
+board_getc(FILE *file)
+{
+	unsigned char c;
+	(void) file;		/* Not used in this function */
+	c = uart_getc();	/* Defined by underlying system */
+	return c;
+}
+
+static int
+board_flush(FILE *file)
+{
+	(void) file;		/* Not used in this function */
+	return 0;
+}
+
+static FILE __stdio = FDEV_SETUP_STREAM(board_putc, board_getc, board_flush,	_FDEV_SETUP_RW);
+/*
+ * Picolibc requires the application to define these
+ * when using stdio in freestanding environments.
+ */
+// FILE * const stdin  = NULL;
+// FILE * const stdout = NULL;
+// FILE * const stderr = NULL;
+FILE *const stdin = &__stdio;
+__strong_reference(stdin, stdout);
+__strong_reference(stdin, stderr);