drivers/adxk345: include copy of params in dev struct

This follows the usual convention of having the whole params in the device
struct instead of a pointer-to. This also eliminates the need to cast a
const to a non-const pointer in the init function.

drivers/adxl345/adxl345.c

@@ -31,8 +31,8 @@
 #define ENABLE_DEBUG        (0)
 #include "debug.h"
 
-#define ADXL345_BUS                 (dev->params->i2c)
-#define ADXL345_ADDR                (dev->params->addr)
+#define ADXL345_BUS                 (dev->params.i2c)
+#define ADXL345_ADDR                (dev->params.addr)
 
 #define ADXL345_PARAM_SCALE_FACTOR  (4)
 
@@ -43,10 +43,10 @@ int adxl345_init(adxl345_t *dev, const adxl345_params_t* params)
     assert(dev && params);
 
     /* get device descriptor */
-    dev->params = (adxl345_params_t*)params;
+    dev->params = *params;
 
     /* get scale_factor from full_res and range parameters */
-    dev->scale_factor = (dev->params->full_res ? ADXL345_PARAM_SCALE_FACTOR : (4 << dev->params->range));
+    dev->scale_factor = (dev->params.full_res ? ADXL345_PARAM_SCALE_FACTOR : (4 << dev->params.range));
 
     /* Acquire exclusive access */
     i2c_acquire(ADXL345_BUS);
@@ -59,12 +59,12 @@ int adxl345_init(adxl345_t *dev, const adxl345_params_t* params)
         return ADXL345_NODEV;
     }
     /* configure the user offset */
-    i2c_write_regs(ADXL345_BUS, ADXL345_ADDR, ADXL345_OFFSET_X, dev->params->offset, 3, 0);
+    i2c_write_regs(ADXL345_BUS, ADXL345_ADDR, ADXL345_OFFSET_X, dev->params.offset, 3, 0);
     /* Basic device setup */
-    reg = (dev->params->full_res ? ADXL345_FULL_RES : 0);
-    reg |= dev->params->range;
+    reg = (dev->params.full_res ? ADXL345_FULL_RES : 0);
+    reg |= dev->params.range;
     i2c_write_reg(ADXL345_BUS, ADXL345_ADDR, ADXL345_DATA_FORMAT, reg, 0);
-    i2c_write_reg(ADXL345_BUS, ADXL345_ADDR, ADXL345_BW_RATE, dev->params->rate, 0);
+    i2c_write_reg(ADXL345_BUS, ADXL345_ADDR, ADXL345_BW_RATE, dev->params.rate, 0);
     /* Put device in measure mode */
     i2c_write_reg(ADXL345_BUS, ADXL345_ADDR, ADXL345_POWER_CTL, ADXL345_MEASURE_BIT, 0);
 

drivers/include/adxl345.h

@@ -157,7 +157,7 @@ typedef struct {
  * @brief   Device descriptor for the ADXL345 sensor
  */
 typedef struct {
-    adxl345_params_t *params;       /**< Device configuration */
+    adxl345_params_t params;        /**< Device configuration */
     adxl345_interrupt_t interrupt;  /**< Interrupts configuration  */
     int16_t scale_factor;           /**< Scale factor for converting value to mg */
 } adxl345_t;