add time

.vscode/settings.json

@@ -5,6 +5,8 @@
         "tim.h": "c",
         "compare": "c",
         "type_traits": "c",
-        "gpio.h": "c"
+        "gpio.h": "c",
+        "stdint.h": "c",
+        "time.h": "c"
     }
 }

Core/App/app.c

@@ -3,6 +3,7 @@
 #include "ui.h"
 #include "keypad.h"
 #include "global.h"
+#include "time.h"
 
 void app_init() {
     // 程序开始时执行一次

Core/Inc/time.h

@@ -0,0 +1,6 @@
+#pragma once
+#include <stdint.h>
+
+int32_t ticks_ms();
+int32_t ticks_add(int32_t t1, int32_t delta);
+int32_t ticks_diff(int32_t t1, int32_t t2);

Core/Src/time.c

@@ -0,0 +1,16 @@
+#include <stdint.h>
+#include "time.h"
+#include "main.h"
+
+int32_t ticks_ms() {
+    return HAL_GetTick() & INT32_MAX;
+}
+
+int32_t ticks_add(int32_t t1, int32_t delta) {
+    return (t1 + delta) & INT32_MAX;
+}
+
+int32_t ticks_diff(int32_t t1, int32_t t2) {
+    int32_t half = (INT32_MAX / 2) + 1;
+    return ((t1 - t2 + half) & INT32_MAX) - half;
+}

Makefile

@@ -68,6 +68,7 @@ Core/Src/gpio.c \
 Core/Src/usart.c \
 Core/Src/spi.c \
 Core/Src/system_stm32g0xx.c \
+Core/Src/time.c \
 Core/App/app.c \
 Core/App/global.c \
 Core/Hardware/RotaryCoder/RotaryCoder.c	\