feat(steami_screen): Add SSD1327 display wrapper.

Author: nedseb

lib/steami_screen/examples/watch.py

@@ -0,0 +1,32 @@
+"""
+Tutorial 09 — Analog Watch
+Displays an analog clock face using the built-in RTC.
+"""
+
+import time
+
+import ssd1327
+from machine import RTC, SPI, Pin
+from steami_screen import Screen, SSD1327Display
+
+# --- Screen setup ---
+spi = SPI(1)
+dc = Pin("DATA_COMMAND_DISPLAY")
+res = Pin("RST_DISPLAY")
+cs = Pin("CS_DISPLAY")
+
+display = SSD1327Display(ssd1327.WS_OLED_128X128_SPI(spi, dc, res, cs))
+screen = Screen(display)
+
+# --- RTC setup ---
+rtc = RTC()
+
+# --- Main loop ---
+while True:
+    _, _, _, _, h, m, s, _ = rtc.datetime()
+
+    screen.clear()
+    screen.watch(h, m, s)
+    screen.show()
+
+    time.sleep(0.5)

lib/steami_screen/steami_screen/__init__.py

@@ -11,6 +11,7 @@
     YELLOW,
     Screen,
 )
+from steami_screen.ssd1327 import SSD1327Display
 
 __all__ = [
     "BLACK",
@@ -22,6 +23,7 @@
     "RED",
     "WHITE",
     "YELLOW",
+    "SSD1327Display",
     "Screen",
     "rgb_to_gray4",
     "rgb_to_rgb8",

lib/steami_screen/steami_screen/device.py

@@ -15,8 +15,6 @@
 import math
 
 # --- Color constants (RGB tuples) ---
-from steami_screen.colors import rgb_to_gray4
-
 # Grays map to exact SSD1327 levels: gray4 * 17 gives R=G=B
 BLACK = (0, 0, 0)
 DARK  = (102, 102, 102)   # gray4=6
@@ -52,14 +50,6 @@ def __init__(self, display, width=None, height=None):
         self._d = display
         self.width = width or getattr(display, 'width', 128)
         self.height = height or getattr(display, 'height', 128)
-        # Detect if the backend needs greyscale ints (SSD1327) or accepts RGB tuples
-        self._needs_gray = not hasattr(display, 'fill_rect') or hasattr(display, 'framebuf')
-
-    def _c(self, color):
-        """Convert color for the backend. Returns gray4 int for SSD1327, pass-through otherwise."""
-        if self._needs_gray:
-            return rgb_to_gray4(color)
-        return color
 
     # --- Adaptive properties ---
 
@@ -121,7 +111,7 @@ def _resolve(self, at, text_len=0, scale=1):
     def title(self, text, color=GRAY):
         """Draw title text at the top (N)."""
         x, y = self._resolve("N", len(text))
-        self._text(text, x, y, color)
+        self._d.text(text, x, y, color)
 
     def value(self, val, unit=None, at="CENTER", label=None,
              color=WHITE, scale=2, y_offset=0):
@@ -156,7 +146,7 @@ def value(self, val, unit=None, at="CENTER", label=None,
         # Optional label above
         if label:
             lx = x + tw // 2 - len(label) * self.CHAR_W // 2
-            self._text(label, lx, y - self.CHAR_H - 4, GRAY)
+            self._d.text(label, lx, y - self.CHAR_H - 4, GRAY)
 
         # Value (large)
         self._draw_scaled_text(text, x, y, color, scale)
@@ -168,7 +158,7 @@ def value(self, val, unit=None, at="CENTER", label=None,
             if hasattr(self._d, 'draw_medium_text'):
                 self._d.draw_medium_text(unit, ux, unit_y, LIGHT)
             else:
-                self._text(unit, ux, unit_y, LIGHT)
+                self._d.text(unit, ux, unit_y, LIGHT)
 
     def subtitle(self, *lines, color=DARK):
         """Draw subtitle text at the bottom (S). Accepts multiple lines."""
@@ -185,7 +175,7 @@ def subtitle(self, *lines, color=DARK):
             block_h = (n - 1) * line_h
             start_y = base_y - block_h // 2
 
-        draw = getattr(self._d, 'draw_small_text', self._text)
+        draw = getattr(self._d, 'draw_small_text', self._d.text)
         for i, line in enumerate(lines):
             x, _ = self._resolve("S", len(line))
             y = start_y + i * line_h
@@ -246,7 +236,7 @@ def gauge(self, val, min_val=0, max_val=100, unit=None, color=LIGHT):
             if hasattr(self._d, 'draw_medium_text'):
                 self._d.draw_medium_text(unit, ux, uy, LIGHT)
             else:
-                self._text(unit, ux, uy, LIGHT)
+                self._d.text(unit, ux, uy, LIGHT)
 
         # Min/max labels at arc endpoints (slightly inward to stay visible)
         min_t = str(int(min_val))
@@ -259,7 +249,7 @@ def gauge(self, val, min_val=0, max_val=100, unit=None, color=LIGHT):
         ly = int(cy + r_label * math.sin(angle_s))
         rx = int(cx + r_label * math.cos(angle_e)) - len(max_t) * self.CHAR_W // 2
         ry = int(cy + r_label * math.sin(angle_e))
-        draw_sm = getattr(self._d, 'draw_small_text', self._text)
+        draw_sm = getattr(self._d, 'draw_small_text', self._d.text)
         draw_sm(min_t, lx, ly, GRAY)
         draw_sm(max_t, rx, ry, GRAY)
 
@@ -280,7 +270,7 @@ def graph(self, data, min_val=0, max_val=100, color=LIGHT):
         if data:
             text = str(int(data[-1]))
             draw_fn = getattr(self._d, 'draw_medium_text',
-                              self._text)
+                              self._d.text)
             tw = len(text) * self.CHAR_W
             vx = cx - tw // 2
             vy = 31
@@ -292,7 +282,7 @@ def _fmt(v):
                 return str(int(v // 1000)) + "k"
             return str(int(v))
 
-        draw_sm = getattr(self._d, 'draw_small_text', self._text)
+        draw_sm = getattr(self._d, 'draw_small_text', self._d.text)
         mid_val = (min_val + max_val) / 2
         for val, yp in [(max_val, gy),
                         (mid_val, gy + gh // 2),
@@ -349,9 +339,9 @@ def menu(self, items, selected=0, color=WHITE):
             iy = y + (i - start) * item_h
             if i == selected:
                 self._fill_rect(15, iy - 2, self.width - 30, item_h, DARK)
-                self._text("> " + items[i], 18, iy, color)
+                self._d.text("> " + items[i], 18, iy, color)
             else:
-                self._text("  " + items[i], 18, iy, GRAY)
+                self._d.text("  " + items[i], 18, iy, GRAY)
 
     def compass(self, heading, color=LIGHT):
         """Draw a compass with a rotating needle."""
@@ -367,7 +357,7 @@ def compass(self, heading, color=LIGHT):
             lx = cx + int((r + 5) * math.sin(math.radians(angle)))
             ly = cy - int((r + 5) * math.cos(math.radians(angle)))
             c = WHITE if label == "N" else GRAY
-            self._text(label, lx - self.CHAR_W // 2, ly - self.CHAR_H // 2, c)
+            self._d.text(label, lx - self.CHAR_W // 2, ly - self.CHAR_H // 2, c)
 
         # Tick marks (8 directions)
         for angle in range(0, 360, 45):
@@ -435,7 +425,7 @@ def watch(self, hours, minutes, seconds=0, color=LIGHT):
             lx = cx + int((r - 15) * math.sin(rad))
             ly = cy - int((r - 15) * math.cos(rad))
             tw = len(text) * self.CHAR_W
-            self._text(text, lx - tw // 2, ly - self.CHAR_H // 2, WHITE)
+            self._d.text(text, lx - tw // 2, ly - self.CHAR_H // 2, WHITE)
 
         # Hour hand (short, thick)
         h_angle = (hours % 12 + minutes / 60) * 30
@@ -514,7 +504,7 @@ def text(self, text, at="CENTER", color=WHITE, scale=1):
         if scale > 1:
             self._draw_scaled_text(text, x, y, color, scale)
         else:
-            self._text(text, x, y, color)
+            self._d.text(text, x, y, color)
 
     def line(self, x1, y1, x2, y2, color=WHITE):
         self._line(x1, y1, x2, y2, color)
@@ -532,49 +522,37 @@ def rect(self, x, y, w, h, color=WHITE, fill=False):
             self._rect(x, y, w, h, color)
 
     def pixel(self, x, y, color=WHITE):
-        self._pixel(x, y, self._c(color))
+        self._d.pixel(x, y, color)
 
     # --- Control ---
 
     def clear(self, color=BLACK):
-        self._d.fill(self._c(color))
+        self._d.fill(color)
 
     def show(self):
         self._d.show()
 
     # --- Internal drawing helpers ---
 
-    def _text(self, text, x, y, c):
-        self._d.text(text, x, y, self._c(c))
-
-    def _pixel(self, x, y, c):
-        self._d.pixel(x, y, self._c(c))
-
     def _line(self, x1, y1, x2, y2, c):
-        self._d.line(x1, y1, x2, y2, self._c(c))
+        self._d.line(x1, y1, x2, y2, c)
 
     def _hline(self, x, y, w, c):
-        self._d.line(x, y, x + w - 1, y, self._c(c))
+        self._d.line(x, y, x + w - 1, y, c)
 
     def _vline(self, x, y, h, c):
-        self._d.line(x, y, x, y + h - 1, self._c(c))
+        self._d.line(x, y, x, y + h - 1, c)
 
     def _fill_rect(self, x, y, w, h, c):
-        cc = self._c(c)
         if hasattr(self._d, 'fill_rect'):
-            self._d.fill_rect(x, y, w, h, cc)
-        elif hasattr(self._d, 'framebuf'):
-            self._d.framebuf.fill_rect(x, y, w, h, cc)
+            self._d.fill_rect(x, y, w, h, c)
         else:
             for row in range(h):
-                self._d.line(x, y + row, x + w - 1, y + row, cc)
+                self._d.line(x, y + row, x + w - 1, y + row, c)
 
     def _rect(self, x, y, w, h, c):
-        cc = self._c(c)
         if hasattr(self._d, 'rect'):
-            self._d.rect(x, y, w, h, cc)
-        elif hasattr(self._d, 'framebuf'):
-            self._d.framebuf.rect(x, y, w, h, cc)
+            self._d.rect(x, y, w, h, c)
         else:
             self._hline(x, y, w, c)
             self._hline(x, y + h - 1, w, c)
@@ -594,21 +572,21 @@ def _draw_scaled_text(self, text, x, y, color, scale):
         # On real hardware without scaled text support, draw at scale=1
         # centered at the same position (best effort)
         if not hasattr(self._d, 'pixel'):
-            self._text(text, x, y, color)
+            self._d.text(text, x, y, color)
             return
         # Render at 1x to a temporary buffer, then scale up
         # For MicroPython: draw each character using the display's text method
         # but multiple times offset for a bold effect at scale 2
         if scale == 2:
             for dx in range(2):
                 for dy in range(2):
-                    self._text(text, x + dx, y + dy, color)
+                    self._d.text(text, x + dx, y + dy, color)
         elif scale == 3:
             for dx in range(3):
                 for dy in range(3):
-                    self._text(text, x + dx, y + dy, color)
+                    self._d.text(text, x + dx, y + dy, color)
         else:
-            self._text(text, x, y, color)
+            self._d.text(text, x, y, color)
 
     def _draw_arc(self, cx, cy, r, start_deg, sweep_deg, color, width=3):
         """Draw a thick arc using individual pixels."""
@@ -623,7 +601,7 @@ def _draw_arc(self, cx, cy, r, start_deg, sweep_deg, color, width=3):
                 x = int(cx + (r + dr) * math.cos(angle))
                 y = int(cy + (r + dr) * math.sin(angle))
                 if 0 <= x < self.width and 0 <= y < self.height:
-                    self._pixel(x, y, color)
+                    self._d.pixel(x, y, color)
 
     def _draw_circle(self, cx, cy, r, color):
         """Bresenham circle."""
@@ -633,7 +611,7 @@ def _draw_circle(self, cx, cy, r, color):
                            (x, -y), (y, -x), (-x, -y), (-y, -x)):
                 px, py = cx + sx, cy + sy
                 if 0 <= px < self.width and 0 <= py < self.height:
-                    self._pixel(px, py, color)
+                    self._d.pixel(px, py, color)
             y += 1
             if d < 0:
                 d += 2 * y + 1

lib/steami_screen/steami_screen/ssd1327.py

@@ -0,0 +1,51 @@
+"""SSD1327 display wrapper — converts RGB colors to 4-bit grayscale.
+
+Wraps the raw SSD1327 driver so that steami_screen can pass RGB tuples
+while the hardware receives grayscale values (0-15).
+
+Usage on the STeaMi board:
+    import ssd1327
+    from steami_screen import SSD1327Display
+    raw = ssd1327.WS_OLED_128X128_SPI(spi, dc, res, cs)
+    display = SSD1327Display(raw)
+"""
+
+from steami_screen.colors import rgb_to_gray4
+
+
+class SSD1327Display:
+    """Thin wrapper around an SSD1327 driver that accepts RGB colors."""
+
+    def __init__(self, raw):
+        self._raw = raw
+        self.width = getattr(raw, 'width', 128)
+        self.height = getattr(raw, 'height', 128)
+
+    def fill(self, color):
+        self._raw.fill(rgb_to_gray4(color))
+
+    def pixel(self, x, y, color):
+        self._raw.pixel(x, y, rgb_to_gray4(color))
+
+    def text(self, string, x, y, color):
+        self._raw.text(string, x, y, rgb_to_gray4(color))
+
+    def line(self, x1, y1, x2, y2, color):
+        self._raw.line(x1, y1, x2, y2, rgb_to_gray4(color))
+
+    def fill_rect(self, x, y, w, h, color):
+        gray = rgb_to_gray4(color)
+        if hasattr(self._raw, 'fill_rect'):
+            self._raw.fill_rect(x, y, w, h, gray)
+        else:
+            self._raw.framebuf.fill_rect(x, y, w, h, gray)
+
+    def rect(self, x, y, w, h, color):
+        gray = rgb_to_gray4(color)
+        if hasattr(self._raw, 'rect'):
+            self._raw.rect(x, y, w, h, gray)
+        else:
+            self._raw.framebuf.rect(x, y, w, h, gray)
+
+    def show(self):
+        self._raw.show()