From 4ced1453cee7a3131459040efd57f73bfc77aece Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Mon, 15 Jun 2020 14:02:42 +0100
Subject: guage code

---
 app/gauge.c | 145 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 app/gauge.c

(limited to 'app/gauge.c')

diff --git a/app/gauge.c b/app/gauge.c
new file mode 100644
index 0000000..c71d8d9
--- /dev/null
+++ b/app/gauge.c
@@ -0,0 +1,145 @@
+#include "project.h"
+
+#define P1_N GPIO12
+#define P1_N_PORT GPIOB
+#define P1_P GPIO13
+#define P1_P_PORT GPIOB
+#define P2_N GPIO14
+#define P2_N_PORT GPIOB
+#define P2_P GPIO15
+#define P2_P_PORT GPIOB
+
+
+unsigned gauge_target;
+static unsigned gauge_current;
+
+#define GUAGE_N_STATE 6
+static unsigned gauge_state;
+
+
+static inline unsigned
+ccw (unsigned v)
+{
+  v += GUAGE_N_STATE - 1;
+
+  if (v >= GUAGE_N_STATE)
+    v -= GUAGE_N_STATE;
+
+  return v;
+}
+
+
+static inline unsigned
+cw (unsigned v)
+{
+  v += 1;
+
+  if (v >= GUAGE_N_STATE)
+    v -= GUAGE_N_STATE;
+
+  return v;
+}
+
+static inline void
+p1 (int i)
+{
+  if (i < 0) {
+    SET (P1_N);
+    CLEAR (P1_P);
+  } else if (i > 0) {
+    CLEAR (P1_N);
+    SET (P1_P);
+  } else {
+    CLEAR (P1_N);
+    CLEAR (P1_P);
+  }
+}
+
+static inline void
+p2 (int i)
+{
+  if (i < 0) {
+    SET (P2_N);
+    CLEAR (P2_P);
+  } else if (i > 0) {
+    CLEAR (P2_N);
+    SET (P2_P);
+  } else {
+    CLEAR (P2_N);
+    CLEAR (P2_P);
+  }
+}
+
+
+
+void
+gauge_ticker (void)
+{
+
+  if (gauge_current < gauge_target) {
+    gauge_state = cw (gauge_state);
+    gauge_current++;
+  } else if (gauge_current > gauge_target) {
+    gauge_state = ccw (gauge_state);
+    gauge_current--;
+  }
+
+  switch (gauge_state) {
+  case 0:
+    p1 (1);
+    p2 (1);
+    break;
+
+  case 1:
+    p1 (1);
+    p2 (0);
+    break;
+
+  case 2:
+    p1 (0);
+    p2 (-1);
+    break;
+
+  case 3:
+    p1 (-1);
+    p2 (-1);
+    break;
+
+  case 4:
+    p1 (-1);
+    p2 (0);
+    break;
+
+  case 5:
+    p1 (0);
+    p2 (1);
+  }
+
+}
+
+void
+gauge_test (void)
+{
+  char buf[8];
+  uint32_t now = dwt_read_cycle_counter();  /*This wraps every 59.9 seconds or so */
+
+  now &= 0x3fffffff;            /* now wraps every 15s */
+  now = now / (0x3fffffff / 810);
+
+  gauge_target = now;
+
+  sprintf (buf, "%3d", gauge_target);
+  font8x8_put_str (vram_1, buf, 90, 24);
+}
+
+
+
+
+void
+gauge_init (void)
+{
+  MAP_OUTPUT_PP (P1_N);
+  MAP_OUTPUT_PP (P1_P);
+  MAP_OUTPUT_PP (P2_N);
+  MAP_OUTPUT_PP (P2_P);
+}
-- 
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