max31855.h File Reference

#include <stdint.h>
#include "no_os_spi.h"
#include "no_os_util.h"

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Classes
struct	max31855_init_param
	MAX31855 comm init param. More...
struct	max31855_decimal
	interger/decimal format used for temperature representation More...
struct	_max31855_fault_sts_mask
union	max31855_fault_sts
struct	max31855_dev
	MAX31855 descriptor. More...

Macros
#define	MAX31855_GET_INTERNAL_TEMP(x)   (no_os_field_get(NO_OS_GENMASK(15, 4), x))
#define	MAX31855_GET_FAULT_BIT(x)   (no_os_field_get(NO_OS_BIT(16), x))
#define	MAX31855_GET_THERMOCOUPLE_TEMP(x)   (no_os_field_get(NO_OS_GENMASK(31, 18), x))
#define	MAX31855_GET_FAULTS(x)   (no_os_field_get(NO_OS_GENMASK(2, 0), x))
#define	MAX31855_THERMOCOUPLE_TEMP_DEC_DIV   4
#define	MAX31855_INTERNAL_TEMP_DEC_DIV   16
#define	MAX31855_THERMOCOUPLE_TEMP_SIGN_POS   13
#define	MAX31855_INTERNAL_TEMP_SIGN_POS   11

Functions
int	max31855_init (struct max31855_dev **, struct max31855_init_param *)
	Device and comm init function. More...
int	max31855_remove (struct max31855_dev *)
	Remove resources allocated by the init function. More...
int	max31855_read_raw (struct max31855_dev *, uint32_t *)
	Read raw register value. More...
int	max31855_read_temp (struct max31855_dev *, struct max31855_decimal *, struct max31855_decimal *)
	Read thermocouple and internal temperatures (converted in deg. C) More...

Macro Definition Documentation

MAX31855_GET_FAULT_BIT

#define MAX31855_GET_FAULT_BIT

(

x

)

(no_os_field_get(NO_OS_BIT(16), x))

MAX31855_GET_FAULTS

#define MAX31855_GET_FAULTS

(

x

)

(no_os_field_get(NO_OS_GENMASK(2, 0), x))

MAX31855_GET_INTERNAL_TEMP

#define MAX31855_GET_INTERNAL_TEMP

(

x

)

(no_os_field_get(NO_OS_GENMASK(15, 4), x))

MAX31855_GET_THERMOCOUPLE_TEMP

#define MAX31855_GET_THERMOCOUPLE_TEMP

(

x

)

(no_os_field_get(NO_OS_GENMASK(31, 18), x))

MAX31855_INTERNAL_TEMP_DEC_DIV

#define MAX31855_INTERNAL_TEMP_DEC_DIV   16

MAX31855_INTERNAL_TEMP_SIGN_POS

#define MAX31855_INTERNAL_TEMP_SIGN_POS   11

MAX31855_THERMOCOUPLE_TEMP_DEC_DIV

#define MAX31855_THERMOCOUPLE_TEMP_DEC_DIV   4

Decimal resolution for the 2 temperatures (0.25 C and 0.0625 C / LSB). integer_temp = raw_temp / dec_div.

MAX31855_THERMOCOUPLE_TEMP_SIGN_POS

#define MAX31855_THERMOCOUPLE_TEMP_SIGN_POS   13

Sign bit position

Function Documentation

max31855_init()

int max31855_init	(	struct max31855_dev **	device,
		struct max31855_init_param *	init_param
	)

Device and comm init function.

Device and comm init function

Parameters

device	- MAX31855 descriptor to be initialized
init_param	- Init parameter for descriptor

Returns

0 in case of success, errno errors otherwise

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max31855_read_raw()

int max31855_read_raw	(	struct max31855_dev *	device,
		uint32_t *	val
	)

Read raw register value.

Read raw register value

Parameters

device	- MAX31855 descriptor
val	- register value

Returns

0 in case of success, negative error code otherwise

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max31855_read_temp()

int max31855_read_temp	(	struct max31855_dev *	device,
		struct max31855_decimal *	thermocouple_temp,
		struct max31855_decimal *	internal_temp
	)

Read thermocouple and internal temperatures (converted in deg. C)

Read thermocouple and internal temperatures (converted in deg. C)

Parameters

device	- MAX31855 descriptor
thermocouple_temp	- thermocouple probe temperature (deg. C)
internal_temp	- board's temperature (used as reference)

Returns

0 in case of success, errno errors otherwise

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max31855_remove()

int max31855_remove

(

struct max31855_dev *

device

)

Remove resources allocated by the init function.

Free resources allocated by the init function

Parameters

device

- MAX31855 descriptor

Returns

0 in case of success, errno errors otherwise

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