DIG4 单位字母改 F/C (华氏F/摄氏C) (APP V1.00.38)

- display_decode 增加 type 入参, DIG4 按类型写 F(0x0F)/C(0x0C)
- 仅 APP 改动, Boot 不动 (仍 V1.00.07)
- docs/开发日志.md: 新增 §66

docs/开发日志.md

@@ -1613,3 +1613,14 @@ APP2 链接的镜像发向 APP1 区。设备端 END 校验（向量表 Reset PC
   - `app_display.h` 头部注释与 `display_set` 说明更新为温度位序。
 - 版本：APP `V1.00.36` → `V1.00.37`（`APP_FW_VERSION_NUM` 0x00010024 →
   0x00010025）。Boot 不动（仍 V1.00.07）。
+
+## 66. DIG4 单位字母改 F/C（华氏 F、摄氏 C）（2026-09-06，APP V1.00.38，仅 APP）
+
+- 用户确认：DIG4 不是固定 F，而是**华氏显示 F、摄氏显示 C**。
+- 修改：
+  - `app_display.c` `display_decode()` 增加 `type` 入参，DIG4 按类型写
+    `0x0F`（F，FAHRENHEIT）或 `0x0C`（C，CELSIUS）；`display_task` 调用处
+    传入 `type`；
+  - `app_display.h` 头部注释同步为 "DIG4 = unit letter (F/C)"。
+- 版本：APP `V1.00.37` → `V1.00.38`（`APP_FW_VERSION_NUM` 0x00010025 →
+  0x00010026）。Boot 不动（仍 V1.00.07）。

mcm-ddc-ble/inc/app_display.h

@@ -3,8 +3,8 @@
  * @brief YF30137 7-segment display driver.
  *
  * The YF30137 is a 7-pin Charlieplexed temperature display:
- *   - DIG1 = hundreds, DIG2 = tens, DIG3 = ones, DIG4 = fixed "F",
- *     DIG5 = tenths (one decimal place)
+ *   - DIG1 = hundreds, DIG2 = tens, DIG3 = ones,
+ *     DIG4 = unit letter ("F" Fahrenheit / "C" Celsius), DIG5 = tenths
  *   - DIG6 holds two single indicators: A6 = "deg F", B6 = decimal point
  *
  * A dedicated FreeRTOS task (display_task) scans the module continuously.

mcm-ddc-ble/inc/app_version.h

@@ -9,12 +9,12 @@
 #define __APP_VERSION_H__
 
 #ifndef APP_FW_VERSION
-#define APP_FW_VERSION      "V1.00.37"
+#define APP_FW_VERSION      "V1.00.38"
 #endif
 
 /* Numeric form used by the BLE info query / OTA records: 0x00MMmmpp */
 #ifndef APP_FW_VERSION_NUM
-#define APP_FW_VERSION_NUM  0x00010025u
+#define APP_FW_VERSION_NUM  0x00010026u
 #endif
 
 #endif /* __APP_VERSION_H__ */

mcm-ddc-ble/src/app_display.c

@@ -234,17 +234,19 @@ static uint8_t seg_of_char(uint8_t c)
  *           DIG1 = hundreds (百位)
  *           DIG2 = tens     (十位)
  *           DIG3 = ones     (个位)
- *           DIG4 = fixed "F" (华氏/摄氏度的固定标志)
+ *           DIG4 = unit letter: "F" (Fahrenheit) / "C" (Celsius)
  *           DIG5 = tenths   (小数位)
  *         DIG6-A (degF indicator) and DIG6-B (decimal point) are handled by
  *         the scan loop, not here.
  *
  * @param  value    temperature to display, clamped to 0.0..999.9
+ * @param  type     DISP_TYPE_CELSIUS / DISP_TYPE_FAHRENHEIT (DIG4 letter)
  * @param  base     unused (kept for API compatibility)
- * @param  digits   out: 5 codes (0..9, 0xF for the fixed "F", CHAR_BLANK)
+ * @param  digits   out: 5 codes (0..9, 0xF="F"/0xC="C", CHAR_BLANK)
  * @param  dp_flag  out: 1 = light the DIG6 decimal point (always 1)
  */
-static void display_decode(float value, uint8_t base, uint8_t *digits, uint8_t *dp_flag)
+static void display_decode(float value, uint8_t type, uint8_t base,
+                           uint8_t *digits, uint8_t *dp_flag)
 {
     int32_t scaled;
     uint8_t i;
@@ -287,8 +289,8 @@ static void display_decode(float value, uint8_t base, uint8_t *digits, uint8_t *
         digits[1] = CHAR_BLANK;
     }
 
-    /* DIG4 = fixed "F" */
-    digits[3] = 0x0Fu;   /* seg_of_char(0xF) -> F */
+    /* DIG4 = unit letter: F for Fahrenheit, C for Celsius */
+    digits[3] = (type == DISP_TYPE_FAHRENHEIT) ? 0x0Fu : 0x0Cu;
 }
 
 /* Public functions -----------------------------------------------------------*/
@@ -386,7 +388,7 @@ void display_task(void *pvParameters)
         type  = g_disp_type;
         base  = g_disp_base;
 
-        display_decode(value, base, digits, &dp_flag);
+        display_decode(value, type, base, digits, &dp_flag);
 
         /* DIG1..DIG5 */
         for (d = 1u; d <= DISP_DIGITS; d++)

tools/out/mothercup_ble_prod_ota.json

@@ -1,7 +1,7 @@
 {
   "file": "mothercup_ble_prod_ota.bin",
   "target_bank": 1,
-  "size": 59660,
-  "crc32": "0xF3E3A0A8",
-  "version": 65573
+  "size": 59676,
+  "crc32": "0xFB89F8D4",
+  "version": 65574
 }

tools/out/mothercup_ble_prod_ota_app2.json

@@ -1,7 +1,7 @@
 {
   "file": "mothercup_ble_prod_ota_app2.bin",
   "target_bank": 2,
-  "size": 59960,
-  "crc32": "0x14643A48",
-  "version": 65573
+  "size": 59976,
+  "crc32": "0x5B5BD6F2",
+  "version": 65574
 }