diff --git a/bsp/lpc408x/drivers/drv_adc.c b/bsp/lpc408x/drivers/drv_adc.c
index ff7825df55..0d9501b505 100644
--- a/bsp/lpc408x/drivers/drv_adc.c
+++ b/bsp/lpc408x/drivers/drv_adc.c
@@ -20,47 +20,47 @@ struct lpc_adc
 */
 static rt_err_t lpc_adc_enabled(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled)
 {
-	struct lpc_adc *adc;
+    struct lpc_adc *adc;
 
     RT_ASSERT(device != RT_NULL);
     adc = (struct lpc_adc *)device->parent.user_data;
-	
-	//enabled ADC
-	if(enabled == RT_FALSE) adc->ADC->CR &= ~(1<<21);
-	else adc->ADC->CR |= (1<<21);
-	
-	//Select the channel
-	adc->ADC->CR |= (1<<channel);
+
+    //enabled ADC
+    if(enabled == RT_FALSE) adc->ADC->CR &= ~(1<<21);
+    else adc->ADC->CR |= (1<<21);
+
+    //Select the channel
+    adc->ADC->CR |= (1<<channel);
 
     return RT_EOK;
 }
 
 static rt_err_t lpc_adc_convert(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value)
 {
-	rt_uint32_t data;
+    rt_uint32_t data;
 
-	struct lpc_adc *adc;
+    struct lpc_adc *adc;
 
     RT_ASSERT(device != RT_NULL);
     adc = (struct lpc_adc *)device->parent.user_data;
-	
-	adc->ADC->CR = (LPC_ADC->CR & 0x00FFFF00) | (1<<channel) | (1 << 24);
-	while ((adc->ADC->GDR & 0x80000000) == 0); 
-	adc->ADC->CR = adc->ADC->CR | (1 << 24); 
-	while ((adc->ADC->GDR & 0x80000000) == 0);  
 
-	data = adc->ADC->GDR; 
-	data = (data >> 4) & 0xFFF;
-	
-	*value = data;	
-	
-	return RT_EOK;
+    adc->ADC->CR = (LPC_ADC->CR & 0x00FFFF00) | (1<<channel) | (1 << 24);
+    while ((adc->ADC->GDR & 0x80000000) == 0);
+    adc->ADC->CR = adc->ADC->CR | (1 << 24);
+    while ((adc->ADC->GDR & 0x80000000) == 0);
+
+    data = adc->ADC->GDR;
+    data = (data >> 4) & 0xFFF;
+
+    *value = data;
+
+    return RT_EOK;
 }
 
 static const struct rt_adc_ops lpc_adc_ops =
 {
-	lpc_adc_enabled,
-	lpc_adc_convert,
+    lpc_adc_enabled,
+    lpc_adc_convert,
 };
 
 struct lpc_adc lpc_adc0 =
@@ -72,16 +72,16 @@ struct rt_adc_device adc0;
 
 int rt_hw_adc_init(void)
 {
-	rt_err_t ret = RT_EOK;
-	struct lpc_adc *adc;
-	
-	adc = &lpc_adc0;
-	
-	adc0.ops = &lpc_adc_ops;
-	adc0.parent.user_data = adc;
-	
-	//ADC port
-	LPC_IOCON->P0_23 = 0x01;     //ADC0[0]
+    rt_err_t ret = RT_EOK;
+    struct lpc_adc *adc;
+
+    adc = &lpc_adc0;
+
+    adc0.ops = &lpc_adc_ops;
+    adc0.parent.user_data = adc;
+
+    //ADC port
+    LPC_IOCON->P0_23 = 0x01;     //ADC0[0]
     LPC_IOCON->P0_24 = 0x01;     //ADC0[1]
     LPC_IOCON->P0_25 = 0x01;     //ADC0[2]
     LPC_IOCON->P0_26 = 0x01;     //ADC0[3]
@@ -89,12 +89,12 @@ int rt_hw_adc_init(void)
     LPC_IOCON->P1_31 = 0x03;     //ADC0[5]
     LPC_IOCON->P0_12 = 0x03;     //ADC0[6]
     LPC_IOCON->P0_13 = 0x03;     //ADC0[7]
-	
-	
-	//clock
-	LPC_SC->PCONP |= (1U << 12);
-	//config
-	LPC_ADC->CR = 0;
+
+
+    //clock
+    LPC_SC->PCONP |= (1U << 12);
+    //config
+    LPC_ADC->CR = 0;
     LPC_ADC->CR = (1 << 0)|      // SEL
                   ((PeripheralClock / 1000000 - 1) << 8) |    // CLKDIV = Fpclk / 1000000 - 1
                   (0 << 16)|     // BURST
@@ -103,12 +103,12 @@ int rt_hw_adc_init(void)
                   (0 << 22)|     // TEST1
                   (1 << 24)|     // START
                   (0 << 27);     // EDGE
-	//waiting
+    //waiting
     while ((LPC_ADC->GDR & 0x80000000) == 0);
 
-	ret = rt_hw_adc_register(&adc0,"adc0",&lpc_adc_ops,adc);
-	
-	return ret;
+    ret = rt_hw_adc_register(&adc0,"adc0",&lpc_adc_ops,adc);
+
+    return ret;
 }
 
 INIT_BOARD_EXPORT(rt_hw_adc_init);