[errno code][-RT_ERROR] fix that use RT_ERROR without -

6 files changed, 12 insertions, 12 deletions

diff --git a/documentation/device/adc/adc.md b/documentation/device/adc/adc.md
index 8b1f60fed4..9ded20ae7f 100644
--- a/documentation/device/adc/adc.md
+++ b/documentation/device/adc/adc.md
@@ -236,7 +236,7 @@ static int adc_vol_sample(int argc, char *argv[])
     if (adc_dev == RT_NULL)
     {
         rt_kprintf("adc sample run failed! can't find %s device!\n", ADC_DEV_NAME);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
 
     /* enable the device */
diff --git a/documentation/device/device.md b/documentation/device/device.md
index 2f24f61304..4c8c026c18 100644
--- a/documentation/device/device.md
+++ b/documentation/device/device.md
@@ -461,7 +461,7 @@ int main(void)
     if (!wdg_dev)
     {
         rt_kprintf("find %s failed!\n", IWDG_DEVICE_NAME);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
     /* initialize device */
     res = rt_device_init(wdg_dev);
diff --git a/documentation/device/hwtimer/hwtimer.md b/documentation/device/hwtimer/hwtimer.md
index 333578b104..da8903a547 100644
--- a/documentation/device/hwtimer/hwtimer.md
+++ b/documentation/device/hwtimer/hwtimer.md
@@ -354,7 +354,7 @@ static int hwtimer_sample(int argc, char *argv[])
     if (hw_dev == RT_NULL)
     {
         rt_kprintf("hwtimer sample run failed! can't find %s device!\n", HWTIMER_DEV_NAME);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
 
     /* Open the device in read-write mode */
@@ -384,7 +384,7 @@ static int hwtimer_sample(int argc, char *argv[])
     if (rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s)) != sizeof(timeout_s))
     {
         rt_kprintf("set timeout value failed\n");
-        return RT_ERROR;
+        return -RT_ERROR;
     }
 
     /* delay 3500ms */
diff --git a/documentation/device/pwm/pwm.md b/documentation/device/pwm/pwm.md
index e87c1328f9..792078289e 100644
--- a/documentation/device/pwm/pwm.md
+++ b/documentation/device/pwm/pwm.md
@@ -223,7 +223,7 @@ static int pwm_led_sample(int argc, char *argv[])
     if (pwm_dev == RT_NULL)
     {
         rt_kprintf("pwm sample run failed! can't find %s device!\n", PWM_DEV_NAME);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
 
     /* Set PWM period and pulse width defaults */
diff --git a/documentation/device/uart/uart.md b/documentation/device/uart/uart.md
index 27227607b0..d49a005019 100644
--- a/documentation/device/uart/uart.md
+++ b/documentation/device/uart/uart.md
@@ -482,7 +482,7 @@ static int uart_sample(int argc, char *argv[])
     if (!serial)
     {
         rt_kprintf("find %s failed!\n", uart_name);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
 
     /* Initialize the semaphore */
@@ -503,7 +503,7 @@ static int uart_sample(int argc, char *argv[])
     }
     else
     {
-        ret = RT_ERROR;
+        ret = -RT_ERROR;
     }
 
     return ret;
@@ -609,7 +609,7 @@ static int uart_dma_sample(int argc, char *argv[])
     if (!serial)
     {
         rt_kprintf("find %s failed!\n", uart_name);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
 
     /* Initialize message queue */
@@ -635,7 +635,7 @@ static int uart_dma_sample(int argc, char *argv[])
     }
     else
     {
-        ret = RT_ERROR;
+        ret = -RT_ERROR;
     }
 
     return ret;
diff --git a/documentation/device/watchdog/watchdog.md b/documentation/device/watchdog/watchdog.md
index 053c4f20ec..e300f5a798 100644
--- a/documentation/device/watchdog/watchdog.md
+++ b/documentation/device/watchdog/watchdog.md
@@ -201,21 +201,21 @@ static int iwdg_sample(int argc, char *argv[])
     if (!wdg_dev)
     {
         rt_kprintf("find %s failed!\n", device_name);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
     /* initialize the device */
     ret = rt_device_init(wdg_dev);
     if (ret != RT_EOK)
     {
         rt_kprintf("initialize %s failed!\n", device_name);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
     /* set the overflow time of the watch dog */
     ret = rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_SET_TIMEOUT, &timeout);
     if (ret != RT_EOK)
     {
         rt_kprintf("set %s timeout failed!\n", device_name);
-        return RT_ERROR;
+        return -RT_ERROR;
     }
     /* set idle thread callback function */
     rt_thread_idle_sethook(idle_hook);