RP2040: Implement watchdog

Author: giulcioffi

targets/TARGET_RASPBERRYPI/TARGET_RP2040/watchdog_api.c

@@ -0,0 +1,46 @@
+#include "watchdog_api.h"
+#include "hardware/watchdog.h"
+#include "structs/watchdog.h"
+
+#if DEVICE_WATCHDOG
+
+watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
+{
+    // The pico watchdogs accept a maximum value of 0x7fffff
+    if ( config->timeout_ms < 0x1 && config->timeout_ms > 0x7FFFFF ) {
+        return WATCHDOG_STATUS_INVALID_ARGUMENT;
+    }
+
+    watchdog_enable(config->timeout_ms, true);
+
+    return WATCHDOG_STATUS_OK;
+}
+
+void hal_watchdog_kick(void)
+{
+    watchdog_update();
+}
+
+watchdog_status_t hal_watchdog_stop(void)
+{
+    hw_clear_bits(&watchdog_hw->ctrl, WATCHDOG_CTRL_ENABLE_BITS);
+    return WATCHDOG_STATUS_OK;
+}
+
+uint32_t hal_watchdog_get_reload_value(void)
+{
+    return (watchdog_hw->load / 2000U);
+}
+
+watchdog_features_t hal_watchdog_get_platform_features(void)
+{
+    watchdog_features_t features;
+
+    features.max_timeout = 0x7FFFFF;
+    features.update_config = true;
+    features.disable_watchdog = true;
+    return features;
+
+}
+
+#endif // DEVICE_WATCHDOG

targets/targets.json

@@ -7976,6 +7976,7 @@
             "SERIAL_FC",
             "SPI",
             "USTICKER",
+            "WATCHDOG",
             "USBDEVICE"
         ]
     },