1 files changed, 100 insertions, 0 deletions
diff --git a/radiator-plc/stm32/app/rain.c b/radiator-plc/stm32/app/rain.c
new file mode 100644
index 0000000..4188990
--- /dev/null
+++ b/radiator-plc/stm32/app/rain.c
@@ -0,0 +1,100 @@
+#include "project.h"
+
+#define DEBOUNCE 20
+
+static uint8_t r_state;
+static uint32_t r_ticks;
+static uint8_t r_current;
+static uint8_t r_filtered;
+static unsigned r_expiry;
+
+
+#define RAIN_BANK   GPIOA
+#define RAIN_GPIO GPIO15
+
+static int
+raw_rain (void)
+{
+  return !gpio_get (RAIN_BANK, RAIN_GPIO);
+}
+
+
+void rain_notify (void)
+{
+  if (r_current)
+    vents_rain_notify();
+}
+
+
+void rain_ticker (void)
+{
+  unsigned s;
+  static int ticker = 0;
+
+
+  s = raw_rain();
+
+  if (s == r_state) {
+    if (r_ticks < DEBOUNCE)
+      r_ticks++;
+    else if (r_ticks == DEBOUNCE) {
+      r_current = s;
+      r_ticks++;
+      printf ("D: rain state now %d\r\n", r_current);
+    }
+  } else {
+    r_ticks = 0;
+    r_state = s;
+  }
+
+  if (r_current) {
+    r_filtered = 1;
+    r_expiry = 1800;
+  }
+
+  rain_notify();
+
+  ticker++;
+
+  if (ticker < 1000) return;
+
+  ticker = 0;
+
+  if (r_expiry)
+    r_expiry--;
+  else
+    r_filtered = r_current;
+
+}
+
+void rain_slow_ticker (void)
+{
+  printf ("R: %d %d\r\n", r_current, r_filtered);
+}
+
+
+int rain_filtered_state (void)
+{
+  return r_filtered;
+}
+
+int rain_state (void)
+{
+  return r_current;
+}
+
+char rain_state_char (void)
+{
+  return r_current ? 'Y' : 'N';
+}
+
+void
+rain_init (void)
+{
+  gpio_set_mode (RAIN_BANK, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN,
+                 RAIN_GPIO);
+
+  gpio_set (RAIN_BANK, RAIN_GPIO);
+}
+
+