From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 .../ARM202U/EXAMPLES/ROM/EX.C                      | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/ROM/EX.C

(limited to 'Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/ROM/EX.C')

diff --git a/Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/ROM/EX.C b/Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/ROM/EX.C
new file mode 100644
index 0000000..4430177
--- /dev/null
+++ b/Bachelor/Mikroprozessorsysteme2/ARM202U/EXAMPLES/ROM/EX.C
@@ -0,0 +1,52 @@
+/* We use the following Debug Monitor SWIs to write things out
+ * in this example
+ */
+extern __swi(0) WriteC(char c);		/* Write a character */
+extern __swi(2) Write0(char *s);	/* Write a string */
+
+/* The following symbols are defined by the linker and define
+ * various memory regions which may need to be copied or initialised
+ */
+extern char Image$$RO$$Limit[];
+extern char Image$$RW$$Base[];
+
+
+/* We define some more meaningfull names here */
+#define rom_data_base Image$$RO$$Limit
+#define ram_data_base Image$$RW$$Base
+
+/* This is an example of a pre-initialised variable. */
+static unsigned factory_id = 0xAA55AA55;  /* Factory set ID */
+
+/* This is an example of an uninitialised (or 0 initialised) variable */
+static char display[8][40];		  /* Screen buffer */
+
+static const char hex[16] = "0123456789ABCDEF";
+
+static void pr_hex(unsigned n)
+{
+    int i;
+
+    for (i = 0; i < 8; i++) {
+	WriteC(hex[n >> 28]);
+	n <<= 4;
+    }
+}
+
+void C_Entry(void)
+{
+  if (rom_data_base == ram_data_base) {
+    Write0("Warning: Image has been linked as an application. To link as a ROM image\r\n");
+    Write0("         link with the options -RO <rom-base> -RW <ram-base>\r\n");
+  }
+
+  Write0("'factory_id' is at address ");
+  pr_hex((unsigned)&factory_id);
+  Write0(", contents = ");
+  pr_hex((unsigned)factory_id);
+  Write0("\r\n");
+
+  Write0("'display' is at address ");
+  pr_hex((unsigned)display);
+  Write0("\r\n");
+}
-- 
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