1 files changed, 69 insertions, 0 deletions
diff --git a/src/common/src/GPIO/analog.c b/src/common/src/GPIO/analog.c
new file mode 100644
index 0000000..03b502a
--- /dev/null
+++ b/src/common/src/GPIO/analog.c
@@ -0,0 +1,69 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Matthias P. Braendli, Maximilien Cuony
+ *
+ * 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 "GPIO/analog.h"
+
+#define SUPPLY_HISTORY_LEN 10
+
+static float supply_history[SUPPLY_HISTORY_LEN];
+static int supply_history_ix = 0;
+static int supply_history_ready = 0;
+static int last_qrp = 0;
+
+// Return 1 if analog supply is too high
+int analog_supply_too_low(void)
+{
+
+    // Hysteresis:
+    // Lower voltage 12.5V
+    // High  voltage 13V
+    const float measure = analog_measure_12v();
+
+    supply_history[supply_history_ix] = measure;
+    supply_history_ix++;
+    if (supply_history_ix >= SUPPLY_HISTORY_LEN) {
+        supply_history_ix = 0;
+        supply_history_ready = 1;
+    }
+
+    if (supply_history_ready) {
+        float sum = 0.0f;
+        for (int i = 0; i < SUPPLY_HISTORY_LEN; i++) {
+            sum += supply_history[i];
+        }
+        int above_lower_limit = (sum > 12.5f * SUPPLY_HISTORY_LEN);
+        int above_upper_limit = (sum > 13.0f * SUPPLY_HISTORY_LEN);
+
+        if (!above_lower_limit) {
+            last_qrp = 1;
+        }
+        else if (above_upper_limit) {
+            last_qrp = 0;
+        }
+
+        return last_qrp;
+    }
+
+    return 0;
+}