1 files changed, 82 insertions, 0 deletions
diff --git a/firmware/s1224/src/common/banner.c b/firmware/s1224/src/common/banner.c
new file mode 100644
index 0000000..21d1f3c
--- /dev/null
+++ b/firmware/s1224/src/common/banner.c
@@ -0,0 +1,82 @@
+/*
+ * Fixed boot banner — edit source only; not INI / CDC.
+ * Always printed once after USB CDC ready (main); quiet never suppresses it.
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+#include "banner.h"
+#include "version.h"
+#include "afsk_soft.h"
+#include <stdio.h>
+#include <string.h>
+
+/* Fixed CDC column width for centered serial look (40–48). */
+#define BANNER_WIDTH 44
+
+/** Display columns (UTF-8 code points ≈ 1 col; ASCII-safe). */
+static size_t banner_cols(const char *s)
+{
+    size_t cols = 0;
+    while (*s) {
+        unsigned char c = (unsigned char)*s++;
+        if ((c & 0x80u) == 0u) {
+            cols++;
+        } else if ((c & 0xE0u) == 0xC0u) {
+            if (*s) {
+                s++;
+            }
+            cols++;
+        } else if ((c & 0xF0u) == 0xE0u) {
+            if (*s) {
+                s++;
+            }
+            if (*s) {
+                s++;
+            }
+            cols++;
+        } else if ((c & 0xF8u) == 0xF0u) {
+            if (*s) {
+                s++;
+            }
+            if (*s) {
+                s++;
+            }
+            if (*s) {
+                s++;
+            }
+            cols++;
+        } else {
+            cols++;
+        }
+    }
+    return cols;
+}
+
+static void banner_line(const char *text)
+{
+    size_t cols = banner_cols(text);
+    size_t pad = 0;
+    if (cols < BANNER_WIDTH) {
+        pad = (BANNER_WIDTH - cols) / 2u;
+    }
+    for (size_t i = 0; i < pad; i++) {
+        putchar(' ');
+    }
+    fputs(text, stdout);
+    fputs("\r\n", stdout);
+}
+
+void banner_print(void)
+{
+    /* Fixed boot banner — edit source only */
+    char line[BANNER_WIDTH + 8];
+
+    snprintf(line, sizeof(line), "T-Modem-s1224 %s", S1224_FW_VERSION);
+    banner_line(line);
+
+    snprintf(line, sizeof(line), "USB KISS Half-TNC · AFSK %u",
+             (unsigned)afsk_bitrate());
+    banner_line(line);
+
+    banner_line("Non-Profit · GNU GPLv3 · AS-IS");
+    banner_line("https://github.com/ngteq");
+}