1 files changed, 31 insertions, 0 deletions
diff --git a/firmware/s1224/src/common/ptt.c b/firmware/s1224/src/common/ptt.c
new file mode 100644
index 0000000..f54f221
--- /dev/null
+++ b/firmware/s1224/src/common/ptt.c
@@ -0,0 +1,31 @@
+/*
+ * PTT via Pico GPIO — host asserts over USB CDC (Type-A Path B), not softmodem.
+ * PIN_PTT_DRV = keying (required). PIN_LED_PTT = optional/spare TX LED mirror.
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+#include "ptt.h"
+#include "board_pins.h"
+#include "hardware/gpio.h"
+
+static bool g_ptt;
+
+void ptt_init(void)
+{
+    gpio_init(PIN_PTT_DRV);
+    gpio_set_dir(PIN_PTT_DRV, GPIO_OUT);
+    gpio_put(PIN_PTT_DRV, 0);
+    g_ptt = false;
+    gpio_put(PIN_LED_PTT, 0);
+}
+
+void ptt_set(bool on)
+{
+    g_ptt = on;
+    gpio_put(PIN_PTT_DRV, on ? 1 : 0);
+    gpio_put(PIN_LED_PTT, on ? 1 : 0);
+}
+
+bool ptt_get(void)
+{
+    return g_ptt;
+}