[dac] add get resolution method

2 files changed, 14 insertions, 8 deletions

diff --git a/components/drivers/misc/adc.c b/components/drivers/misc/adc.c
index ae324a16ec..9c87919793 100644
--- a/components/drivers/misc/adc.c
+++ b/components/drivers/misc/adc.c
@@ -58,7 +58,7 @@ static rt_err_t _adc_control(rt_device_t dev, int cmd, void *args)
         if(resolution != 0)
         {
             *((rt_uint8_t*)args) = resolution;
-            LOG_D("ADC resolution:%d", resolution);
+            LOG_D("resolution: %d bits", resolution);
             result = RT_EOK;
         }
     }
diff --git a/components/drivers/misc/dac.c b/components/drivers/misc/dac.c
index 548a7bde99..ecbadfd502 100644
--- a/components/drivers/misc/dac.c
+++ b/components/drivers/misc/dac.c
@@ -40,21 +40,27 @@ static rt_size_t _dac_write(rt_device_t dev, rt_off_t pos, const void *buffer, r
 
 static rt_err_t _dac_control(rt_device_t dev, int cmd, void *args)
 {
-    rt_err_t result = RT_EOK;
+    rt_err_t result = -RT_EINVAL;
     rt_dac_device_t dac = (struct rt_dac_device *)dev;
 
-    if (dac->ops->enabled == RT_NULL)
-    {
-        return -RT_ENOSYS;
-    }
-    if (cmd == RT_DAC_CMD_ENABLE)
+    if (cmd == RT_DAC_CMD_ENABLE && dac->ops->enabled)
     {
         result = dac->ops->enabled(dac, (rt_uint32_t)args);
     }
-    else if (cmd == RT_DAC_CMD_DISABLE)
+    else if (cmd == RT_DAC_CMD_DISABLE && dac->ops->enabled)
     {
         result = dac->ops->disabled(dac, (rt_uint32_t)args);
     }
+    else if (cmd == RT_DAC_CMD_GET_RESOLUTION && dac->ops->get_resolution)
+    {
+        rt_uint8_t resolution = dac->ops->get_resolution(dac);
+        if(resolution != 0)
+        {
+            *((rt_uint8_t*)args) = resolution;
+            LOG_D("resolution: %d bits", resolution);
+            result = RT_EOK;
+        }
+    }
 
     return result;
 }