diff --git a/components/drivers/spi/SConscript b/components/drivers/spi/SConscript
index 5608bdcab65dc40f15f40a6c346d2a2a11574c71..01cc608c2b4027410fede9f714d3f84fd71b9970 100644
--- a/components/drivers/spi/SConscript
+++ b/components/drivers/spi/SConscript
@@ -1,8 +1,10 @@
 from building import *
+import rtconfig
 
 cwd = GetCurrentDir()
 src = ['spi_core.c', 'spi_dev.c']
 CPPPATH = [cwd, cwd + '/../include']
+LOCAL_CCFLAGS = ''
 
 src_device = []
 
@@ -32,9 +34,13 @@ if GetDepend('RT_USING_SFUD'):
     CPPPATH += [cwd + '/sfud/inc']
     if GetDepend('RT_SFUD_USING_SFDP'):
         src_device += ['sfud/src/sfud_sfdp.c']
+    if rtconfig.CROSS_TOOL == 'gcc':
+        LOCAL_CCFLAGS += ' -std=c99'
+    elif rtconfig.CROSS_TOOL == 'keil':
+        LOCAL_CCFLAGS += ' --c99'
 
 src += src_device
 
-group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_SPI'], CPPPATH = CPPPATH)
+group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_SPI'], CPPPATH = CPPPATH, LOCAL_CCFLAGS = LOCAL_CCFLAGS)
 
 Return('group')
diff --git a/components/drivers/spi/spi_flash_sfud.c b/components/drivers/spi/spi_flash_sfud.c
index aef6babe0e406a69235df3a188b4a7a143969fef..c94effa61319b49ee7e1d4bc2d893d6786a65496 100644
--- a/components/drivers/spi/spi_flash_sfud.c
+++ b/components/drivers/spi/spi_flash_sfud.c
@@ -165,11 +165,6 @@ static void spi_unlock(const sfud_spi *spi) {
     rt_mutex_release(&(rtt_dev->lock));
 }
 
-static void retry_delay_ms(void) {
-    /* millisecond delay */
-    rt_tick_from_millisecond(1);
-}
-
 static void retry_delay_100us(void) {
     /* 100 microsecond delay */
     rt_thread_delay((RT_TICK_PER_SECOND * 1 + 9999) / 10000);
@@ -242,6 +237,9 @@ rt_spi_flash_device_t rt_sfud_flash_probe(const char *spi_flash_dev_name, const
     rt_spi_flash_device_t rtt_dev = RT_NULL;
     sfud_flash *sfud_dev = RT_NULL;
     char *spi_flash_dev_name_bak = RT_NULL, *spi_dev_name_bak = RT_NULL;
+    /* using default flash SPI configuration for initialize SPI Flash
+     * @note you also can change the SPI to other configuration after initialized finish */
+    struct rt_spi_configuration cfg = RT_SFUD_DEFAULT_SPI_CFG;
     extern sfud_err sfud_device_init(sfud_flash *flash);
 
     RT_ASSERT(spi_flash_dev_name);
@@ -269,9 +267,6 @@ rt_spi_flash_device_t rt_sfud_flash_probe(const char *spi_flash_dev_name, const
                 goto error;
             }
             sfud_dev->spi.name = spi_dev_name_bak;
-            /* using default flash SPI configuration for initialize SPI Flash
-             * @note you also can change the SPI to other configuration after initialized finish */
-            struct rt_spi_configuration cfg = RT_SFUD_DEFAULT_SPI_CFG;
             rt_spi_configure(rtt_dev->rt_spi_device, &cfg);
             /* initialize lock */
             rt_mutex_init(&(rtt_dev->lock), spi_flash_dev_name, RT_IPC_FLAG_FIFO);