1 files changed, 87 insertions, 0 deletions
diff --git a/sim/erc32/examples/hello.c b/sim/erc32/examples/hello.c
new file mode 100644
index 0000000..02903cf
--- /dev/null
+++ b/sim/erc32/examples/hello.c
@@ -0,0 +1,87 @@
+/* A small test program to demonstrate use of UARTs and clock */
+
+
+#define RXADATA (int *) 0x01F800E0
+#define RXBDATA (int *) 0x01F800E4
+#define RXSTAT (int *) 0x01F800E8
+
+int write (fd, buf, nbyte)
+int fd;
+char *buf;
+int nbyte;
+{
+
+        int *rxadata;
+        int rxmask;
+	int nsave;
+	volatile *rxstat;
+
+	nsave = nbyte;
+
+	switch (fd) {
+		case 0 : 
+			rxadata = RXADATA;
+			rxmask = 6;
+			break;
+		case 1 : 
+			rxadata = RXBDATA;
+			rxmask = 0x60000;
+			break;
+		default:
+			return (-1);
+	}
+	rxstat = RXSTAT;
+        while (nbyte > 0) {
+		while ((*rxstat & rxmask) == 0);
+		*rxadata = *buf;
+		buf++;
+		nbyte--;
+	}
+	return (nsave);
+}
+
+int read (fd, buf, nbyte)
+int fd;
+char *buf;
+int nbyte;
+{
+
+        int rxmask,*rxadata;
+	int nsave;
+	volatile *rxstat;
+
+	nsave = nbyte;
+	switch (fd) {
+		case 0 : 
+			rxadata = RXADATA;
+			rxmask = 1;
+			break;
+		case 1 : 
+			rxadata = RXBDATA;
+			rxmask = 0x10000;
+			break;
+		default:
+			return (-1);
+	}
+	rxstat = RXSTAT;
+        while (nbyte > 0) {
+		while ((*rxstat & rxmask) == 0);
+		*buf =  *rxadata;
+		buf++;
+                nbyte--;
+	}
+	return (nsave);
+}
+
+char *
+puts(s)
+char *s;
+{
+    while (*s) write(0,s++,1);
+}
+
+main()
+{
+    puts("Hello world!\n");
+}
+