New compile file

tama.c

@@ -89,21 +89,31 @@ static uint8_t  evo_anim;           // frames remaining for an evolution banner
 // settings
 static uint8_t  sound_on    = 1;
 static uint8_t  timeout_idx = 1; // index into screen_timeout_opts (default 10 s)
+static uint8_t  bright_idx  = 1; // index into brightness_opts (default Med)
 static uint8_t  set_sel     = 0; // highlighted row on the settings screen
 static uint8_t  sel_species = 0; // highlighted species on the welcome screen
 
+// OLED contrast (brightness) levels written to SSD1306_SETCONTRAST (0x81).
+// Lower also means less charge-pump current, which is gentler on the coin cell.
+static const uint8_t brightness_opts[]  = { 0x01, 0x30, 0x80, 0xCF };
+static const char *const brightness_names[] = { "Low", "Med", "High", "Max" };
+#define BRIGHT_OPT_COUNT 4
+
 // screen-off-on-inactivity options, in frames (0 = never sleep the display).
 // Shorter timeouts blank the OLED sooner, which is the single biggest power
 // win on a CR2032 — the panel draws far more than the dozing MCU.
 static const uint16_t screen_timeout_opts[] = { 83, 167, 250, 500, 1000, 0 };
 static const char *const screen_timeout_names[] = { "5s", "10s", "15s", "30s", "60s", "Off" };
 #define TIMEOUT_OPT_COUNT 6
-#define SETTINGS_ROWS     3      // screen-off, sound, back
+#define SETTINGS_ROWS     4      // screen-off, brightness, sound, back
 
 // display power state
 static uint8_t  disp_on     = 1;
 static uint32_t idle_frames = 0; // frames since the last button activity
 
+// reset cause latched at boot (helps tell a brown-out from a software reset)
+static uint32_t reset_cause = 0;
+
 // menu icon order must match sprites.h menu_icons[] / menu_labels[]
 enum { ACT_FEED, ACT_PLAY, ACT_SLEEP, ACT_CLEAN, ACT_HEAL, ACT_STATS, ACT_SETTINGS };
 
@@ -146,6 +156,13 @@ static void led_blink(void)
 	funDigitalWrite(LED_PIN, FUN_LOW);
 }
 
+// push the currently selected brightness to the panel's contrast register
+static void apply_brightness(void)
+{
+	ssd1306_cmd(SSD1306_SETCONTRAST);
+	ssd1306_cmd(brightness_opts[bright_idx]);
+}
+
 static void pet_reset(void)
 {
 	pet.satiety  = 80;
@@ -547,11 +564,12 @@ static void draw_settings(void)
 
 	char rows[SETTINGS_ROWS][17];
 	*s_cat(s_cat(rows[0], "Screen off:"), screen_timeout_names[timeout_idx]) = 0;
-	*s_cat(s_cat(rows[1], "Sound: "), sound_on ? "On" : "Off") = 0;
-	*s_cat(rows[2], "Back") = 0;
+	*s_cat(s_cat(rows[1], "Bright: "), brightness_names[bright_idx]) = 0;
+	*s_cat(s_cat(rows[2], "Sound: "), sound_on ? "On" : "Off") = 0;
+	*s_cat(rows[3], "Back") = 0;
 
 	for (uint8_t r = 0; r < SETTINGS_ROWS; r++) {
-		int y = 18 + r * 12;
+		int y = 12 + r * 11;
 		if (r == set_sel) ssd1306_fillRect(0, y - 1, SSD1306_W, 10, 1);
 		// selected row drawn inverted (color 0 on the lit bar)
 		ssd1306_drawstr(4, y, rows[r], r == set_sel ? 0 : 1);
@@ -693,6 +711,21 @@ static void splash(void)
 		beep(1200 + i * 120, 25);
 		Delay_Ms(220);
 	}
+	// show what woke the chip: POR == power dip / brown-out (e.g. OLED inrush
+	// sagging the coin cell), PIN == reset pin, SFT == software, none == we got
+	// here without a real hardware reset.
+	char rc[20], *rp = rc;
+	rp = s_cat(rp, "rst:");
+	if (reset_cause & RCC_LPWRRSTF) rp = s_cat(rp, "LPW ");
+	if (reset_cause & RCC_WWDGRSTF) rp = s_cat(rp, "WWD ");
+	if (reset_cause & RCC_IWDGRSTF) rp = s_cat(rp, "WDG ");
+	if (reset_cause & RCC_SFTRSTF)  rp = s_cat(rp, "SFT ");
+	if (reset_cause & RCC_PORRSTF)  rp = s_cat(rp, "POR ");
+	if (reset_cause & RCC_PINRSTF)  rp = s_cat(rp, "PIN ");
+	if (rp == rc + 4) rp = s_cat(rp, "none");
+	*rp = 0;
+	ssd1306_drawstr(0, 44, rc, 1);
+
 	draw_center_str(54, "press any key");
 	ssd1306_refresh();
 	beep(988, 120);
@@ -709,6 +742,8 @@ static void splash(void)
 int main(void)
 {
 	SystemInit();
+	reset_cause = RCC->RSTSCKR & 0xFC000000;  // latch reset flags...
+	RCC->RSTSCKR |= RCC_RMVF;                  // ...then clear for next boot
 	gpio_setup();
 	lowpower_setup();              // button-wake EXTI + periodic-check timer
 
@@ -718,6 +753,7 @@ int main(void)
 		while (1) { led_blink(); Delay_Ms(700); }
 	}
 	ssd1306_init();
+	apply_brightness();            // start at the configured (dimmer) brightness
 
 	splash();
 	screen = SCR_SELECT;           // pick a species before a pet is born
@@ -793,7 +829,11 @@ int main(void)
 					if (set_sel == 0) {       // cycle screen-off timeout
 						timeout_idx = (timeout_idx + 1) % TIMEOUT_OPT_COUNT;
 						beep(880, 40);
-					} else if (set_sel == 1) { // toggle sound
+					} else if (set_sel == 1) { // cycle brightness
+						bright_idx = (bright_idx + 1) % BRIGHT_OPT_COUNT;
+						apply_brightness();     // takes effect immediately
+						beep(880, 40);
+					} else if (set_sel == 2) { // toggle sound
 						sound_on = !sound_on;
 						beep(988, 60);          // only audible if just enabled
 					} else {                   // Back