diff --git a/cpu/stm32/include/periph/c0/periph_cpu.h b/cpu/stm32/include/periph/c0/periph_cpu.h
index 81408b0349..ab6e7cf69b 100644
--- a/cpu/stm32/include/periph/c0/periph_cpu.h
+++ b/cpu/stm32/include/periph/c0/periph_cpu.h
@@ -31,6 +31,21 @@ extern "C" {
  */
 #define STM32_BOOTLOADER_ADDR   (0x1FFF0000)
 
+/**
+ * @brief   Override ADC resolution values
+ * @{
+ */
+#define HAVE_ADC_RES_T
+typedef enum {
+    ADC_RES_6BIT  = (ADC_CFGR1_RES),    /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR1_RES_1),  /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR1_RES_0),  /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported) */
+} adc_res_t;
+/** @} */
+
 /**
  * @name   Constants for internal VBAT ADC line
  * @{
diff --git a/cpu/stm32/include/periph/f0/periph_cpu.h b/cpu/stm32/include/periph/f0/periph_cpu.h
index f8202c1798..9323084b3a 100644
--- a/cpu/stm32/include/periph/f0/periph_cpu.h
+++ b/cpu/stm32/include/periph/f0/periph_cpu.h
@@ -53,12 +53,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (0x3 << 3),     /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (0x2 << 3),     /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (0x1 << 3),     /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x0 << 3),     /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0xfe),         /**< not applicable */
-    ADC_RES_16BIT = (0xff)          /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CFGR1_RES),    /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR1_RES_1),  /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR1_RES_0),  /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/f2/periph_cpu.h b/cpu/stm32/include/periph/f2/periph_cpu.h
index f16d4f5f35..a43eebeb96 100644
--- a/cpu/stm32/include/periph/f2/periph_cpu.h
+++ b/cpu/stm32/include/periph/f2/periph_cpu.h
@@ -54,12 +54,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = 0x03000000,  /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = 0x02000000,  /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = 0x01000000,  /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = 0x00000000,  /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = 1,           /**< ADC resolution: 14 bit (not supported) */
-    ADC_RES_16BIT = 2            /**< ADC resolution: 16 bit (not supported)*/
+    ADC_RES_6BIT  = (ADC_CR1_RES),      /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CR1_RES_1),    /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CR1_RES_0),    /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported)*/
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/f3/periph_cpu.h b/cpu/stm32/include/periph/f3/periph_cpu.h
index 01ccf69573..03afd1fa4b 100644
--- a/cpu/stm32/include/periph/f3/periph_cpu.h
+++ b/cpu/stm32/include/periph/f3/periph_cpu.h
@@ -61,12 +61,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (ADC_CFGR_RES),   /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (ADC_CFGR_RES_1), /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (ADC_CFGR_RES_0), /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x0),            /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0x1),            /**< not applicable */
-    ADC_RES_16BIT = (0x2)             /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CFGR_RES),     /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR_RES_1),   /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR_RES_0),   /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/f4/periph_cpu.h b/cpu/stm32/include/periph/f4/periph_cpu.h
index 231e246161..d57130610e 100644
--- a/cpu/stm32/include/periph/f4/periph_cpu.h
+++ b/cpu/stm32/include/periph/f4/periph_cpu.h
@@ -56,17 +56,17 @@ extern "C" {
 #define GET_RDP(x) ((x & 0xFF00) >> 8)
 
 /**
- * @brief   Override the ADC resolution configuration
+ * @brief   Override ADC resolution values
  * @{
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = 0x03000000,     /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = 0x02000000,     /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = 0x01000000,     /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = 0x00000000,     /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = 1,              /**< ADC resolution: 14 bit (not supported) */
-    ADC_RES_16BIT = 2               /**< ADC resolution: 16 bit (not supported)*/
+    ADC_RES_6BIT  = (ADC_CR1_RES),      /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CR1_RES_1),    /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CR1_RES_0),    /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/f7/periph_cpu.h b/cpu/stm32/include/periph/f7/periph_cpu.h
index 1e3ea495b6..043a3906ad 100644
--- a/cpu/stm32/include/periph/f7/periph_cpu.h
+++ b/cpu/stm32/include/periph/f7/periph_cpu.h
@@ -44,17 +44,17 @@ extern "C" {
 #define ADC_DEVS            (3U)
 
 /**
- * @brief   Override the ADC resolution configuration
+ * @brief   Override ADC resolution values
  * @{
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = 0x03000000,     /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = 0x02000000,     /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = 0x01000000,     /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = 0x00000000,     /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = 1,              /**< ADC resolution: 14 bit (not supported) */
-    ADC_RES_16BIT = 2               /**< ADC resolution: 16 bit (not supported)*/
+    ADC_RES_6BIT  = (ADC_CR1_RES),      /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CR1_RES_1),    /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CR1_RES_0),    /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/g0/periph_cpu.h b/cpu/stm32/include/periph/g0/periph_cpu.h
index c325e36f90..ce04edd5c4 100644
--- a/cpu/stm32/include/periph/g0/periph_cpu.h
+++ b/cpu/stm32/include/periph/g0/periph_cpu.h
@@ -32,6 +32,21 @@ extern "C" {
  */
 #define STM32_BOOTLOADER_ADDR   (0x1FFF0000)
 
+/**
+ * @brief   Override ADC resolution values
+ * @{
+ */
+#define HAVE_ADC_RES_T
+typedef enum {
+    ADC_RES_6BIT  = (ADC_CFGR1_RES),    /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR1_RES_1),  /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR1_RES_0),  /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported) */
+} adc_res_t;
+/** @} */
+
 /**
  * @name   Constants for internal VBAT ADC line
  * @{
diff --git a/cpu/stm32/include/periph/l0/periph_cpu.h b/cpu/stm32/include/periph/l0/periph_cpu.h
index 09024937da..8dd8510cbf 100644
--- a/cpu/stm32/include/periph/l0/periph_cpu.h
+++ b/cpu/stm32/include/periph/l0/periph_cpu.h
@@ -40,12 +40,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (0x3 << 3),     /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (0x2 << 3),     /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (0x1 << 3),     /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x0 << 3),     /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0xfe),         /**< not applicable */
-    ADC_RES_16BIT = (0xff)          /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CFGR1_RES),    /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR1_RES_1),  /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR1_RES_0),  /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported)*/
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported)*/
 } adc_res_t;
 /** @} */
 #endif /* ndef DOXYGEN */
diff --git a/cpu/stm32/include/periph/l1/periph_cpu.h b/cpu/stm32/include/periph/l1/periph_cpu.h
index b5155300fe..3893860340 100644
--- a/cpu/stm32/include/periph/l1/periph_cpu.h
+++ b/cpu/stm32/include/periph/l1/periph_cpu.h
@@ -45,12 +45,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (ADC_CR1_RES_0 | ADC_CR1_RES_1),    /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (ADC_CR1_RES_1),                    /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (ADC_CR1_RES_0),                    /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x00),                             /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0xfe),                             /**< not applicable */
-    ADC_RES_16BIT = (0xff)                              /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CR1_RES),      /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CR1_RES_1),    /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CR1_RES_0),    /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe),     /**< ADC resolution: 14 bit (not supported)*/
+    ADC_RES_16BIT = (0xff)      /**< ADC resolution: 16 bit (not supported)*/
 } adc_res_t;
 /** @} */
 #endif /* ndef DOXYGEN */
diff --git a/cpu/stm32/include/periph/l4/periph_cpu.h b/cpu/stm32/include/periph/l4/periph_cpu.h
index 692e12d1c8..768952f283 100644
--- a/cpu/stm32/include/periph/l4/periph_cpu.h
+++ b/cpu/stm32/include/periph/l4/periph_cpu.h
@@ -61,12 +61,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (ADC_CFGR_RES),   /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (ADC_CFGR_RES_1), /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (ADC_CFGR_RES_0), /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x0),            /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0x1),            /**< not applicable */
-    ADC_RES_16BIT = (0x2)             /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CFGR_RES),     /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR_RES_1),   /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR_RES_0),   /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe), /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)  /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/wb/periph_cpu.h b/cpu/stm32/include/periph/wb/periph_cpu.h
index ab9194e15d..636262b9f3 100644
--- a/cpu/stm32/include/periph/wb/periph_cpu.h
+++ b/cpu/stm32/include/periph/wb/periph_cpu.h
@@ -58,12 +58,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (ADC_CFGR_RES),   /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (ADC_CFGR_RES_1), /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (ADC_CFGR_RES_0), /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x0),            /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0x1),            /**< not applicable */
-    ADC_RES_16BIT = (0x2)             /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CFGR_RES),     /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR_RES_1),   /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR_RES_0),   /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe), /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)  /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/include/periph/wl/periph_cpu.h b/cpu/stm32/include/periph/wl/periph_cpu.h
index 8edf765fbb..ad63d89459 100644
--- a/cpu/stm32/include/periph/wl/periph_cpu.h
+++ b/cpu/stm32/include/periph/wl/periph_cpu.h
@@ -42,12 +42,12 @@ extern "C" {
  */
 #define HAVE_ADC_RES_T
 typedef enum {
-    ADC_RES_6BIT  = (ADC_CFGR1_RES),   /**< ADC resolution: 6 bit */
-    ADC_RES_8BIT  = (ADC_CFGR1_RES_1), /**< ADC resolution: 8 bit */
-    ADC_RES_10BIT = (ADC_CFGR1_RES_0), /**< ADC resolution: 10 bit */
-    ADC_RES_12BIT = (0x0),            /**< ADC resolution: 12 bit */
-    ADC_RES_14BIT = (0x1),            /**< not applicable */
-    ADC_RES_16BIT = (0x2)             /**< not applicable */
+    ADC_RES_6BIT  = (ADC_CFGR1_RES),    /**< ADC resolution: 6 bit */
+    ADC_RES_8BIT  = (ADC_CFGR1_RES_1),  /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = (ADC_CFGR1_RES_0),  /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = (0x00),             /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = (0xfe), /**< ADC resolution: 14 bit (not supported) */
+    ADC_RES_16BIT = (0xff)  /**< ADC resolution: 16 bit (not supported) */
 } adc_res_t;
 /** @} */
 
diff --git a/cpu/stm32/periph/adc_f0_g0_c0.c b/cpu/stm32/periph/adc_f0_g0_c0.c
index 6cefe50c32..73a93bd82f 100644
--- a/cpu/stm32/periph/adc_f0_g0_c0.c
+++ b/cpu/stm32/periph/adc_f0_g0_c0.c
@@ -201,7 +201,7 @@ int32_t adc_sample(adc_t line,  adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if (res > 0xf0) {
+    if ((res & ADC_CFGR1_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_f2.c b/cpu/stm32/periph/adc_f2.c
index 48a7bb1b6e..49f030f30b 100644
--- a/cpu/stm32/periph/adc_f2.c
+++ b/cpu/stm32/periph/adc_f2.c
@@ -109,7 +109,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if (res < 0xff) {
+    if ((res & ADC_CR1_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_f3.c b/cpu/stm32/periph/adc_f3.c
index 3e2504f86a..4e249f4874 100644
--- a/cpu/stm32/periph/adc_f3.c
+++ b/cpu/stm32/periph/adc_f3.c
@@ -207,7 +207,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     int sample;
 
     /* Check if resolution is applicable */
-    if (res & 0x3) {
+    if ((res & ADC_CFGR_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_f4_f7.c b/cpu/stm32/periph/adc_f4_f7.c
index e946c1e2a7..947bd0f6f7 100644
--- a/cpu/stm32/periph/adc_f4_f7.c
+++ b/cpu/stm32/periph/adc_f4_f7.c
@@ -129,7 +129,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if (res & 0xff) {
+    if ((res & ADC_CR1_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_l0.c b/cpu/stm32/periph/adc_l0.c
index 99fad3c70d..7475a403a2 100644
--- a/cpu/stm32/periph/adc_l0.c
+++ b/cpu/stm32/periph/adc_l0.c
@@ -118,10 +118,7 @@ int32_t adc_sample(adc_t line,  adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if ( (res != ADC_RES_6BIT) &&
-         (res != ADC_RES_8BIT) &&
-         (res != ADC_RES_10BIT) &&
-         (res != ADC_RES_12BIT)) {
+    if ((res & ADC_CFGR1_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_l1.c b/cpu/stm32/periph/adc_l1.c
index eeab76d997..78a3930579 100644
--- a/cpu/stm32/periph/adc_l1.c
+++ b/cpu/stm32/periph/adc_l1.c
@@ -145,10 +145,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if ( (res != ADC_RES_6BIT) &&
-         (res != ADC_RES_8BIT) &&
-         (res != ADC_RES_10BIT) &&
-         (res != ADC_RES_12BIT)) {
+    if ((res & ADC_CR1_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_l4_wb.c b/cpu/stm32/periph/adc_l4_wb.c
index 280a922f30..71a91b4a60 100644
--- a/cpu/stm32/periph/adc_l4_wb.c
+++ b/cpu/stm32/periph/adc_l4_wb.c
@@ -221,7 +221,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if (res & 0x3) {
+    if ((res & ADC_CFGR_RES) != res) {
         return -1;
     }
 
diff --git a/cpu/stm32/periph/adc_wl.c b/cpu/stm32/periph/adc_wl.c
index 2d6866f376..3697986660 100644
--- a/cpu/stm32/periph/adc_wl.c
+++ b/cpu/stm32/periph/adc_wl.c
@@ -168,7 +168,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     int sample;
 
     /* check if resolution is applicable */
-    if (res & 0x3) {
+    if ((res & ADC_CFGR1_RES) != res) {
         return -1;
     }