Drivers

drivers/0x0d_timer/timer.c

@@ -0,0 +1,62 @@
+/**
+ * @file timer.c
+ * @brief Implementation of repeating timer driver
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "timer.h"
+#include "pico/time.h"
+
+static repeating_timer_t g_timer;
+static bool g_timer_active = false;
+static timer_driver_callback_t g_user_callback = NULL;
+
+static bool timer_shim(repeating_timer_t *rt) {
+    (void)rt;
+    if (g_user_callback) {
+        return g_user_callback();
+    }
+    return false;
+}
+
+void timer_driver_start(int32_t period_ms, timer_driver_callback_t callback) {
+    if (g_timer_active) {
+        cancel_repeating_timer(&g_timer);
+        g_timer_active = false;
+    }
+
+    g_user_callback = callback;
+    g_timer_active = add_repeating_timer_ms(period_ms, timer_shim, NULL, &g_timer);
+}
+
+void timer_driver_cancel(void) {
+    if (!g_timer_active) {
+        return;
+    }
+
+    cancel_repeating_timer(&g_timer);
+    g_timer_active = false;
+}