From 9d87c925a9eaa4fc256be3173c14a20d1469472d Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Wed, 9 Sep 2020 11:53:37 +0100
Subject: everything, mostly, working

---
 boiler-monster/stm32/app/ot_phy_tx.c | 121 +++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 boiler-monster/stm32/app/ot_phy_tx.c

(limited to 'boiler-monster/stm32/app/ot_phy_tx.c')

diff --git a/boiler-monster/stm32/app/ot_phy_tx.c b/boiler-monster/stm32/app/ot_phy_tx.c
new file mode 100644
index 0000000..36fbcc5
--- /dev/null
+++ b/boiler-monster/stm32/app/ot_phy_tx.c
@@ -0,0 +1,121 @@
+#include "project.h"
+
+#define OT_THM_OUT        GPIO9
+#define OT_THM_OUT_PORT   GPIOB
+
+#define OT_BLR_OUT        GPIO8
+#define OT_BLR_OUT_PORT   GPIOB
+
+
+typedef struct tx_phy  {
+  int busy;
+  unsigned  half_bit;
+  uint8_t data[4];
+} TX_Phy;
+
+
+static TX_Phy p_thm, p_blr;
+
+
+
+#if 0
+static uint32_t
+cycle_diff (uint32_t a, uint32_t b)
+{
+  return b - a;
+}
+#endif
+
+
+static int ot_phy_tx_worker (TX_Phy *p)
+{
+  int ret = p->half_bit & 1;
+  unsigned bit;
+
+
+  if (p->half_bit < 2)
+    ret ^= 1;
+
+  else if (p->half_bit < 66) {
+    bit = (p->half_bit >> 1) - 1;
+
+    if (p->data[bit >> 3] & (0x80 >> (bit & 7)))
+      ret ^= 1;
+  } else if (p->half_bit < 68)
+
+    ret ^= 1;
+
+  p->half_bit++;
+
+  if (p->half_bit == 68) {
+    p->half_bit = 0;
+    p->busy = 0;
+  }
+
+  return ret;
+}
+
+
+void ot_phy_tx_tick (void)
+{
+  int v;
+
+  if (p_thm.busy) {
+    v = ot_phy_tx_worker (&p_thm);
+
+    if (v)
+      CLEAR (OT_THM_OUT);
+    else
+      SET (OT_THM_OUT);
+  }
+
+
+  if (p_blr.busy) {
+    v = ot_phy_tx_worker (&p_blr);
+
+    if (v)
+      CLEAR (OT_BLR_OUT);
+    else
+      SET (OT_BLR_OUT);
+
+  }
+}
+
+
+int ot_tx_thm (uint8_t *data)
+{
+  if (p_thm.busy) return -1;
+
+  if (!data) return 0;
+
+  led_blink();
+
+  memcpy (p_thm.data, data, sizeof (p_thm.data));
+  p_thm.busy = 1;
+
+  return 0;
+}
+
+
+int ot_tx_blr (uint8_t *data)
+{
+
+  if (p_blr.busy) return -1;
+
+  if (!data) return 0;
+
+  led_blink();
+
+  memcpy (p_blr.data, data, sizeof (p_blr.data));
+  p_blr.busy = 1;
+
+  return 0;
+}
+
+
+
+void ot_phy_tx_init (void)
+{
+  MAP_OUTPUT_PP (OT_THM_OUT);
+  MAP_OUTPUT_PP (OT_BLR_OUT);
+}
-- 
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