Jonathan Austin / nRF51822

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Utility Functions and Definitions
Data Structures | Typedefs | Enumerations | Functions

Utility Functions and Definitions

Various types and definitions available to all applications. More...

Data Structures

struct  uint8_array_t
 Byte array type. More...

Typedefs

typedef uint8_t uint16_le_t [2]
 type for holding an encoded (i.e.
typedef uint8_t uint32_le_t [4]
 type for holding an encoded (i.e.

Enumerations

enum  { UNIT_0_625_MS = 625, UNIT_1_25_MS = 1250, UNIT_10_MS = 10000 }

Functions

static __INLINE uint64_t value_rescale (uint32_t value, uint32_t old_unit_reversal, uint16_t new_unit_reversal)
 Function for changing the value unit.
static __INLINE uint8_t uint16_encode (uint16_t value, uint8_t *p_encoded_data)
 Function for encoding a uint16 value.
static __INLINE uint8_t uint24_encode (uint32_t value, uint8_t *p_encoded_data)
 Function for encoding a three-byte value.
static __INLINE uint8_t uint32_encode (uint32_t value, uint8_t *p_encoded_data)
 Function for encoding a uint32 value.
static __INLINE uint16_t uint16_decode (const uint8_t *p_encoded_data)
 Function for decoding a uint16 value.
static __INLINE uint32_t uint24_decode (const uint8_t *p_encoded_data)
 Function for decoding a three-byte value.
static __INLINE uint32_t uint32_decode (const uint8_t *p_encoded_data)
 Function for decoding a uint32 value.
static __INLINE uint8_t battery_level_in_percent (const uint16_t mvolts)
 Function for converting the input voltage (in milli volts) into percentage of 3.0 Volts.
static __INLINE bool is_word_aligned (void const *p)
 Function for checking if a pointer value is aligned to a 4 byte boundary.

Detailed Description

Various types and definitions available to all applications.

Typedef Documentation

typedef uint8_t uint16_le_t[2]

type for holding an encoded (i.e.

little endian) 16 bit unsigned integer.

Definition at line 117 of file app_util.h.

typedef uint8_t uint32_le_t[4]

type for holding an encoded (i.e.

little endian) 32 bit unsigned integer.

Definition at line 120 of file app_util.h.

Enumeration Type Documentation

anonymous enum
Enumerator:
UNIT_0_625_MS 

Number of microseconds in 0.625 milliseconds.

UNIT_1_25_MS 

Number of microseconds in 1.25 milliseconds.

UNIT_10_MS 

Number of microseconds in 10 milliseconds.

Definition at line 49 of file app_util.h.

Function Documentation

static __INLINE uint8_t battery_level_in_percent ( const uint16_t  mvolts ) [static]

Function for converting the input voltage (in milli volts) into percentage of 3.0 Volts.

The calculation is based on a linearized version of the battery's discharge curve. 3.0V returns 100% battery level. The limit for power failure is 2.1V and is considered to be the lower boundary.

The discharge curve for CR2032 is non-linear. In this model it is split into 4 linear sections:

  • Section 1: 3.0V - 2.9V = 100% - 42% (58% drop on 100 mV)
  • Section 2: 2.9V - 2.74V = 42% - 18% (24% drop on 160 mV)
  • Section 3: 2.74V - 2.44V = 18% - 6% (12% drop on 300 mV)
  • Section 4: 2.44V - 2.1V = 6% - 0% (6% drop on 340 mV)

These numbers are by no means accurate. Temperature and load in the actual application is not accounted for!

Parameters:
[in]mvoltsThe voltage in mV
Returns:
Battery level in percent.

Definition at line 290 of file app_util.h.

static __INLINE bool is_word_aligned ( void const *  p ) [static]

Function for checking if a pointer value is aligned to a 4 byte boundary.

Parameters:
[in]pPointer value to be checked.
Returns:
TRUE if pointer is aligned to a 4 byte boundary, FALSE otherwise.

Definition at line 328 of file app_util.h.

static __INLINE uint16_t uint16_decode ( const uint8_t *  p_encoded_data ) [static]

Function for decoding a uint16 value.

Parameters:
[in]p_encoded_dataBuffer where the encoded data is stored.
Returns:
Decoded value.

Definition at line 237 of file app_util.h.

static __INLINE uint8_t uint16_encode ( uint16_t  value,
uint8_t *  p_encoded_data 
) [static]

Function for encoding a uint16 value.

Parameters:
[in]valueValue to be encoded.
[out]p_encoded_dataBuffer where the encoded data is to be written.
Returns:
Number of bytes written.

Definition at line 193 of file app_util.h.

static __INLINE uint32_t uint24_decode ( const uint8_t *  p_encoded_data ) [static]

Function for decoding a three-byte value.

Parameters:
[in]p_encoded_dataBuffer where the encoded data is stored.
Returns:
Decoded value (uint32_t).

Definition at line 249 of file app_util.h.

static __INLINE uint8_t uint24_encode ( uint32_t  value,
uint8_t *  p_encoded_data 
) [static]

Function for encoding a three-byte value.

Parameters:
[in]valueValue to be encoded.
[out]p_encoded_dataBuffer where the encoded data is to be written.
Returns:
Number of bytes written.

Definition at line 207 of file app_util.h.

static __INLINE uint32_t uint32_decode ( const uint8_t *  p_encoded_data ) [static]

Function for decoding a uint32 value.

Parameters:
[in]p_encoded_dataBuffer where the encoded data is stored.
Returns:
Decoded value.

Definition at line 262 of file app_util.h.

static __INLINE uint8_t uint32_encode ( uint32_t  value,
uint8_t *  p_encoded_data 
) [static]

Function for encoding a uint32 value.

Parameters:
[in]valueValue to be encoded.
[out]p_encoded_dataBuffer where the encoded data is to be written.
Returns:
Number of bytes written.

Definition at line 222 of file app_util.h.

static __INLINE uint64_t value_rescale ( uint32_t  value,
uint32_t  old_unit_reversal,
uint16_t  new_unit_reversal 
) [static]

Function for changing the value unit.

Parameters:
[in]valueValue to be rescaled.
[in]old_unit_reversalReversal of the incoming unit.
[in]new_unit_reversalReversal of the desired unit.
Returns:
Number of bytes written.

Definition at line 181 of file app_util.h.

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