HALL - Hall Effect SensorBSP > Thunderboard Sense BSP

Detailed Description

Driver for Hall effect sensor.

Modules

Si7210 - Hall Effect Sensor
Driver for the Silicon Labs Si7210 Hall effect sensor.

Data Structures

struct __HALL_Config
Structure to configure the Hall effect sensor device.

Typedefs

typedef struct __HALL_Config HALL_Config
Structure to configure the Hall effect sensor device.
typedef void(* HALL_IntCallback ) (bool pinHigh)

Functions

uint32_t HALL_configure ( HALL_Config *config)
Configures the Si7210 chip.
void HALL_deInit (void)
De-initializes the Hall sensor. Disables the sensor power domain.
uint32_t HALL_deInitDevice (void)
Does device-specific de-initializaiton for the Si7210 chip.
float HALL_getTamperLevel (void)
Returns the tamper level configured in the chip.
uint32_t HALL_init (void)
Initializes the Hall sensor.
uint32_t HALL_initDevice (void)
Does device-specific initializaiton for the Si7210 chip.
uint32_t HALL_measure (uint32_t scale, float *result)
Performs a measurement.
void HALL_registerCallback ( HALL_IntCallback callback)
Register GPIO interrupt callback function. This function will be called when the ALERT pin of the Hall sensor changes state and the interrupt functions are enabled.

Error Codes

#define HALL_OK 0x0000
#define HALL_ERROR_DRIVER_NOT_INITIALIZED 0x0001
#define HALL_ERROR_I2C_TRANSACTION_FAILED 0x0002
#define HALL_ERROR_DEVICE_ID_MISMATCH 0x0003

Configuration values

#define HALL_CONFIG_POLARITY_OMNIPOLAR 0x00
#define HALL_CONFIG_POLARITY_NEGATIVE 0x01
#define HALL_CONFIG_POLARITY_POSITIVE 0x02

Macro Definition Documentation

#define HALL_CONFIG_POLARITY_NEGATIVE   0x01

Negative field polarity

Definition at line 44 of file hall.h .

#define HALL_CONFIG_POLARITY_OMNIPOLAR   0x00

Omnipolar field polarity

Definition at line 43 of file hall.h .

#define HALL_CONFIG_POLARITY_POSITIVE   0x02

Positive field polarity

Definition at line 45 of file hall.h .

#define HALL_ERROR_DEVICE_ID_MISMATCH   0x0003

The device ID does not match the expected value

Definition at line 36 of file hall.h .

Referenced by HALL_initDevice() .

#define HALL_ERROR_DRIVER_NOT_INITIALIZED   0x0001

The driver is not initialized

Definition at line 34 of file hall.h .

#define HALL_ERROR_I2C_TRANSACTION_FAILED   0x0002

I2C transaction failed

Definition at line 35 of file hall.h .

Referenced by SI7210_registerRead() , SI7210_registerWrite() , and SI7210_wakeUp() .

#define HALL_OK   0x0000

No errors

Definition at line 33 of file hall.h .

Referenced by HALL_configure() , HALL_initDevice() , SI7210_loadCoeffsFromOtp() , SI7210_regClearBits() , SI7210_registerRead() , SI7210_registerWrite() , SI7210_regReadOTP() , SI7210_regSetBits() , and SI7210_wakeUp() .

Typedef Documentation

typedef void(* HALL_IntCallback) (bool pinHigh)

Interrupt callback function

Definition at line 59 of file hall.h .

Function Documentation

uint32_t HALL_configure ( HALL_Config * config )

Configures the Si7210 chip.

Parameters
[in] config The structure, which contains the configuration parameters. If all fields are set to zero, the chip will revert to use default values.
Returns
Returns zero on OK, non-zero otherwise

Definition at line 105 of file hall_si7210.c .

References HALL_OK , __HALL_Config::hysteresis , __HALL_Config::outputInvert , __HALL_Config::polarity , SI7210_calculateSWHYST() , SI7210_calculateSWOP() , SI7210_REG_ADDR_CTRL1 , SI7210_REG_ADDR_CTRL2 , SI7210_REG_ADDR_CTRL3 , SI7210_REG_ADDR_POWER_CTRL , SI7210_REG_CTRL1_SW_LOW4FIELD_MASK , SI7210_REG_CTRL1_SW_LOW4FIELD_SHIFT , SI7210_REG_CTRL1_SW_OP_MASK , SI7210_REG_CTRL1_SW_OP_SHIFT , SI7210_REG_CTRL2_SW_FIELDPOLSEL_MASK , SI7210_REG_CTRL2_SW_FIELDPOLSEL_SHIFT , SI7210_REG_CTRL2_SW_HYST_MASK , SI7210_REG_CTRL2_SW_HYST_SHIFT , SI7210_REG_CTRL3_SLTIMEENA_MASK , SI7210_REG_POWER_CTRL_STOP_MASK , SI7210_REG_POWER_CTRL_USESTORE_MASK , SI7210_regClearBits() , SI7210_registerWrite() , SI7210_regSetBits() , SI7210_wakeUp() , and __HALL_Config::threshold .

void HALL_deInit ( void )

De-initializes the Hall sensor. Disables the sensor power domain.

Returns
None

Definition at line 82 of file hall.c .

References BOARD_hallSensorEnable() , BOARD_hallSensorEnableIRQ() , and HALL_deInitDevice() .

uint32_t HALL_deInitDevice ( void )

Does device-specific de-initializaiton for the Si7210 chip.

Returns
Returns zero on OK, non-zero otherwise

Definition at line 89 of file hall_si7210.c .

Referenced by HALL_deInit() .

float HALL_getTamperLevel ( void )

Returns the tamper level configured in the chip.

Returns
The tamper level in mT

Definition at line 228 of file hall_si7210.c .

uint32_t HALL_init ( void )

Initializes the Hall sensor.

Returns
Returns zero on OK, non-zero otherwise

Definition at line 54 of file hall.c .

References BOARD_hallSensorEnable() , BOARD_hallSensorEnableIRQ() , BOARD_hallSensorSetIRQCallback() , HALL_initDevice() , and UTIL_delay() .

uint32_t HALL_initDevice ( void )

Does device-specific initializaiton for the Si7210 chip.

Returns
Returns zero on OK, non-zero otherwise

Definition at line 56 of file hall_si7210.c .

References HALL_ERROR_DEVICE_ID_MISMATCH , HALL_OK , SI7210_identify() , and SI7210_wakeUp() .

Referenced by HALL_init() .

uint32_t HALL_measure ( uint32_t scale,
float * result
)

Performs a measurement.

Parameters
[in] scale Desired scale in uT
[out] result The measured field strength value in mT
Returns
Returns zero on OK, non-zero otherwise

Definition at line 202 of file hall_si7210.c .

References SI7210_readmTDataSltimeena() .

void HALL_registerCallback ( HALL_IntCallback callback )

Register GPIO interrupt callback function. This function will be called when the ALERT pin of the Hall sensor changes state and the interrupt functions are enabled.

Parameters
[in] callback Pointer to the callback function
Returns
None

Definition at line 105 of file hall.c .