From ecd1d2a1892c0cecf3f140a17a7a9e79919e0ff7 Mon Sep 17 00:00:00 2001
From: Me Here <me@here>
Date: Fri, 29 May 2026 14:36:03 -0500
Subject: [PATCH] PM_K-1 0.0.12: Song = 4-bar sections, timer resets with the
 bar, smoother MIDI

- Built-in Song playlist: every section is now b4 (~4 bars) so Continue rolls one into
  the next quickly.
- On-screen timer now counts WITHIN the current segment and resets every time the bar
  counter wraps (new _seg_start, reset at each b<n> boundary + on _reset_clock). The
  practice-log duration still uses play_start (total). Unified the segment-boundary
  handling (timer reset + ramp restart + Continue advance) in _on_new_bar.
- MIDI stutter: display.refresh() BLOCKS on the SPI stream and was delaying the next
  beat's note. Cap refresh to ~30Hz and poll the GT911 touch ~30Hz (was every loop) so
  the scheduler fires notes on time; visuals lag a few ms (imperceptible).

Verified in harness: Build(b4,rmp92/4/2) bpm 92->96->reset@bar4, seg_start resets only at
the boundary, Continue arms there; edit tests pass; app.mpy builds (C/v6).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 pico-cp/__pycache__/app.cpython-312.pyc | Bin 79494 -> 79878 bytes
 pico-cp/app.py                          |  64 +++++++++++++-----------
 2 files changed, 36 insertions(+), 28 deletions(-)

diff --git a/pico-cp/__pycache__/app.cpython-312.pyc b/pico-cp/__pycache__/app.cpython-312.pyc
index 0d4042bf2c0f7212a3d3d05432e1d4258d6d4cc8..e4a72693dd90541c269b2b63da5f407a67b93f2b 100644
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diff --git a/pico-cp/app.py b/pico-cp/app.py
index dbc1287..acc5904 100644
--- a/pico-cp/app.py
+++ b/pico-cp/app.py
@@ -18,7 +18,7 @@
 
 import board, busio, digitalio, analogio, pwmio, displayio, vectorio, time, json, gc, os, supervisor
 supervisor.runtime.autoreload = False   # we write our own files (log + pushed programs); never self-restart
-APP_VERSION = "0.0.11"                   # firmware version (the A/B updater pushes/compares this)
+APP_VERSION = "0.0.12"                   # firmware version (the A/B updater pushes/compares this)
 try:
     import rtc                           # set from the editor's clock SysEx so the log has real timestamps
 except ImportError:
@@ -89,15 +89,15 @@ BUILTIN_SETLISTS = [
         ("Tempo builder 80 up", "t80;woodblock:4;rmp80/4/4"),
         ("Gap trainer (play 2 / rest 2)", "t100;kick:4;hatClosed:4/2;tr2/2"),
     ]),
-    ("Song (continuous)", [
-        ("Intro - hats & kick", "t88;b8;kick:4=X.x.;hatClosed:4/2=gggggggg"),
-        ("Groove in - backbeat", "t88;b16;kick:4=X.x.;snare:4=.X.X;hatClosed:4/2"),
-        ("Half-time shuffle", "t92;b12;kick:4/3=X....x...x..;snare:4/3=..gg.gX.gg.g;hatClosed:4/3=X.xX.xX.xX.x"),
-        ("Build - ramp 92-120", "t92;b16;rmp92/4/2;kick:4;snare:4=.X.X;hatClosed:4/2"),
-        ("Four-on-the-floor (909)", "t124;b18;kick909:4;clap909:4=.X.X;hat909:4/2=.X.X.X.X"),
-        ("Samba break (2/4)", "t116;b24;tomLow:2/4=x...X...;hatClosed:2/4;woodblock:2/4=X.xx.xX."),
-        ("Peak - 16ths", "t132;b16;kick:4=X..x;snare:4=.X.X;hatClosed:4/4"),
-        ("Outro - ramp down", "t132;b8;rmp132/-7/1;kick:4=X..x;hatClosed:4/2=gggggggg"),
+    ("Song (continuous)", [          # ~4-bar sections; with Continue on they roll one into the next
+        ("Intro - hats & kick", "t88;b4;kick:4=X.x.;hatClosed:4/2=gggggggg"),
+        ("Groove in - backbeat", "t88;b4;kick:4=X.x.;snare:4=.X.X;hatClosed:4/2"),
+        ("Half-time shuffle", "t92;b4;kick:4/3=X....x...x..;snare:4/3=..gg.gX.gg.g;hatClosed:4/3=X.xX.xX.xX.x"),
+        ("Build - ramp 92-120", "t92;b4;rmp92/4/2;kick:4;snare:4=.X.X;hatClosed:4/2"),
+        ("Four-on-the-floor (909)", "t124;b4;kick909:4;clap909:4=.X.X;hat909:4/2=.X.X.X.X"),
+        ("Samba break (2/4)", "t116;b4;tomLow:2/4=x...X...;hatClosed:2/4;woodblock:2/4=X.xx.xX."),
+        ("Peak - 16ths", "t132;b4;kick:4=X..x;snare:4=.X.X;hatClosed:4/4"),
+        ("Outro - ramp down", "t132;b4;rmp132/-7/1;kick:4=X..x;hatClosed:4/2=gggggggg"),
     ]),
 ]
 
@@ -421,6 +421,8 @@ class App:
         self.lane_pads = []; self.lane_lit = []
         self.usb_conn = False; self._m_steps = 0     # USB-connected state; master-lane steps (for the bar counter)
         self._uiNext = 0.0; self._lastTs = None; self._lastBs = None   # throttle the stopwatch/bar redraw
+        self._seg_start = 0.0                        # timer origin; resets with the bar counter (each segment)
+        self._refreshNext = 0.0; self._touchNext = 0.0   # cap display refresh + touch polling (tighter MIDI timing)
         self.ic_midi_pal = None; self.ic_usb_pal = None
         # practice history - persisted to /history.json (next to programs.json) when we own the filesystem
         self.can_write = self._probe_write()
@@ -628,6 +630,7 @@ class App:
         for L in self.lanes:
             L['next'] = now; L['step'] = -1
         self._m_steps = 0                               # restart the bar count
+        self._seg_start = time.monotonic()             # and the on-screen timer (resets with the bar counter)
 
     # ---------- audio + light ----------
     def click(self, level):
@@ -709,13 +712,14 @@ class App:
                 self._advance = False
                 self.load((self.idx + 1) % len(self.setlists[self.sl]['items'])); self.led_rest()
     def _on_new_bar(self, bar):
-        if self.ramp and bar > 0:                          # tempo ramp: reset each segment, else step every N bars
-            if self.bars and bar % self.bars == 0: self.set_bpm(self._ramp_base)
-            elif bar % self.ramp['every'] == 0: self.set_bpm(self.bpm + self.ramp['amt'])
-        t = self.trainer                                   # gap trainer: silence during the rest bars of each cycle
+        if self.bars and bar > 0 and bar % self.bars == 0:        # segment boundary
+            self._seg_start = time.monotonic()                    # timer resets with the bar counter
+            if self.ramp: self.set_bpm(self._ramp_base)           # ramp restarts each segment
+            if self.continue_on: self._advance = True             # Continue: roll to the next item
+        elif self.ramp and bar > 0 and bar % self.ramp['every'] == 0:
+            self.set_bpm(self.bpm + self.ramp['amt'])             # mid-segment ramp step
+        t = self.trainer                                          # gap trainer: silence during the rest bars
         self._muted = bool(t and (t['play'] + t['mute']) and (bar % (t['play'] + t['mute'])) >= t['play'])
-        if self.continue_on and self.bars and bar >= self.bars:   # auto-advance at the end of the segment
-            self._advance = True
 
     # ---------- inputs ----------
     def poll(self):
@@ -737,14 +741,16 @@ class App:
                 self.goto(self.idx + (1 if x > 0 else -1)); self._joyNext = now + 350_000_000; return
             else:
                 self._joyNext = now + 20_000_000
-        pt = self.touch.read()
         nowms = time.monotonic()
-        if pt:
-            self._touchSeen = nowms
-            if not self._touchDown:
-                self._touchDown = True; self._handle_tap(pt[0], pt[1])
-        elif self._touchDown and (nowms - self._touchSeen) > 0.14:
-            self._touchDown = False
+        if nowms >= self._touchNext:                    # poll touch ~30x/s (the I2C read adds loop latency -> MIDI jitter)
+            self._touchNext = nowms + 0.033
+            pt = self.touch.read()
+            if pt:
+                self._touchSeen = nowms
+                if not self._touchDown:
+                    self._touchDown = True; self._handle_tap(pt[0], pt[1])
+            elif self._touchDown and (nowms - self._touchSeen) > 0.14:
+                self._touchDown = False
         # USB-MIDI in: any byte = a host is listening (heartbeat); also assemble SysEx (clock / pushed programs)
         if self.midi_in is not None:
             try: n = self.midi_in.readinto(self._mbuf)
@@ -801,7 +807,7 @@ class App:
         run = self.running and self.play_start is not None
         mlen = self.lanes[0]['steps'] if self.lanes else 1
         bpb = (self.lanes[0]['steps'] // max(1, self.lanes[0]['sub'])) if self.lanes else 4
-        el = (time.monotonic() - self.play_start) if run else 0
+        el = (time.monotonic() - self._seg_start) if run else 0   # time within the current segment (resets with the bar)
         mbars = self._m_steps // max(1, mlen)             # whole master bars elapsed
         cur = ("%d" % ((mbars % self.bars + 1) if self.bars else (mbars + 1))) if run else "-"   # cycle 1..N
         if self.bars:                                   # track has a length (b<n>): show "X of TOTAL"
@@ -997,10 +1003,12 @@ class App:
                 try: os.remove("/trial")
                 except Exception: pass
                 committed = True
-            # push a complete frame only when something changed (no mid-update tearing);
-            # capped at the display's refresh rate, so dirty regions stay small and quick
-            if self.dirty and self.display.refresh():
-                self.dirty = False
+            # Refresh at most ~30x/s. display.refresh() BLOCKS while it streams pixels over SPI, which
+            # would otherwise delay the next beat's MIDI note and make the audio stutter; throttling it
+            # keeps the click timing tight (the visuals lag a few ms, which is imperceptible).
+            if self.dirty and tnow >= self._refreshNext:
+                if self.display.refresh(): self.dirty = False
+                self._refreshNext = tnow + 0.033
             time.sleep(0.0005)
 
 App().run()