Update main.c

清理无用代码
添加无存储卡情况

gd32v_lcd/src/main.c

@@ -34,14 +34,12 @@ void init_uart0(void)
 
 int main(void)
 {
-    u8 i,m;
-    float t=0;
+    uint8_t mount_is_ok = 1; /* 0: mount successful ; 1: mount failed */
     int offset = 0;
-    uint64_t start_mtime, delta_mtime;
     FIL fil;
 
     FRESULT fr;     /* FatFs return code */
-    UINT br, bw;
+    UINT br;
 
     rcu_periph_clock_enable(RCU_GPIOA);
     rcu_periph_clock_enable(RCU_GPIOC);
@@ -58,8 +56,14 @@ int main(void)
     LEDG(1);
     LEDB(1);
     fr = f_mount(&fs, "", 1);
+    if (fr == 0)
+        mount_is_ok = 0;
+    else
+        mount_is_ok = 1;
 
     while(1)
+    {
+        if (mount_is_ok == 0)
         {
             offset = 0;
             fr = f_open(&fil, "logo.bin", FA_READ);
@@ -97,6 +101,12 @@ int main(void)
             /* Close the file */
             f_close(&fil);
         }
+        else
+        {
+            LEDR_TOG;
+            delay_1ms(500);
+        }
+    }
 }
 
 int _put_char(int ch)