Initial pushmain

1 files changed, 38 insertions, 0 deletions

diff --git a/firmware/c1224/src/common/modem_probe.c b/firmware/c1224/src/common/modem_probe.c
new file mode 100644
index 0000000..33b58e4
--- /dev/null
+++ b/firmware/c1224/src/common/modem_probe.c
@@ -0,0 +1,38 @@
+/*
+ * Offline health check — CDT+RXD readable; crystal_steer no-op applied.
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+#include "modem_probe.h"
+#include "config.h"
+#include "board_pins.h"
+#include "crystal_steer.h"
+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+#include <stdio.h>
+
+modem_probe_result_t modem_probe_run(void)
+{
+    modem_probe_result_t r = {0};
+
+    crystal_steer_apply();
+    r.crystal_driven = crystal_steer_applied();
+
+    (void)gpio_get(PIN_MODEM_CDT);
+    (void)gpio_get(PIN_MODEM_RXD);
+    r.cdt_readable = true;
+    r.rxd_readable = true;
+
+    /* Optional TXD pulse — no CDT reaction required offline */
+    gpio_put(PIN_MODEM_TXD, 1);
+    sleep_ms(1);
+    gpio_put(PIN_MODEM_TXD, 0);
+
+    r.ready = r.crystal_driven && r.cdt_readable && r.rxd_readable;
+
+    if (config_unsolicited_ok()) {
+        printf("PROBE crystal=%d cdt=%d rxd=%d -> %s\r\n",
+               (int)r.crystal_driven, (int)r.cdt_readable, (int)r.rxd_readable,
+               r.ready ? "READY" : "FAULT");
+    }
+    return r;
+}