[bsp][stm32][f469-disco]Fix the BUG of SD card hot plug detection

Signed-off-by: Willian Chan <chentingwei@rt-thread.com>

bsp/stm32/stm32f469-st-disco/.config

@@ -24,7 +24,7 @@ CONFIG_RT_USING_TIMER_SOFT=y
 CONFIG_RT_TIMER_THREAD_PRIO=4
 CONFIG_RT_TIMER_THREAD_STACK_SIZE=512
 CONFIG_RT_DEBUG=y
-# CONFIG_RT_DEBUG_COLOR is not set
+CONFIG_RT_DEBUG_COLOR=y
 # CONFIG_RT_DEBUG_INIT_CONFIG is not set
 # CONFIG_RT_DEBUG_THREAD_CONFIG is not set
 # CONFIG_RT_DEBUG_SCHEDULER_CONFIG is not set

bsp/stm32/stm32f469-st-disco/board/ports/drv_sdcard.c

@@ -64,20 +64,20 @@ static void _sdcard_unmount(void)
 
 static void sd_mount(void *parameter)
 {
-    rt_uint8_t re_sd_check = 1;
+    rt_uint8_t re_sd_check_pin = 1;
     
     while (1)
     {
         rt_thread_mdelay(200);
-        if(re_sd_check && !rt_pin_read(SD_CHECK_PIN))
+        if(re_sd_check_pin && (re_sd_check_pin = rt_pin_read(SD_CHECK_PIN)) == 0)
         {
             _sdcard_mount();
         }
-        if (!re_sd_check && rt_pin_read(SD_CHECK_PIN))
+        
+        if (!re_sd_check_pin && (re_sd_check_pin = rt_pin_read(SD_CHECK_PIN)) != 0)
         {
             _sdcard_unmount();
         }
-        re_sd_check = rt_pin_read(SD_CHECK_PIN);
     }
 }
 
@@ -88,7 +88,7 @@ int stm32_sdcard_mount(void)
     rt_pin_mode(SD_CHECK_PIN, PIN_MODE_INPUT_PULLUP);
 
     tid = rt_thread_create("sd_mount", sd_mount, RT_NULL,
-                           1024, RT_THREAD_PRIORITY_MAX - 1, 20);
+                           1024, RT_THREAD_PRIORITY_MAX - 2, 20);
     if (tid != RT_NULL)
     {
         rt_thread_startup(tid);

bsp/stm32/stm32f469-st-disco/rtconfig.h

@@ -20,6 +20,7 @@
 #define RT_TIMER_THREAD_PRIO 4
 #define RT_TIMER_THREAD_STACK_SIZE 512
 #define RT_DEBUG
+#define RT_DEBUG_COLOR
 
 /* Inter-Thread communication */