Device driver interface for the BQ2429x Single-Cell USB Charger. More...

Detailed Description

Device driver interface for the BQ2429x Single-Cell USB Charger.

BQ2429x series power management ICs by Texas Instruments are controllable by I2C, allowing to change charge parameters in the runtime.

For more information, see the datasheets:

It can be used for USB OTG to power other devices, see the bq2429x_enable_otg and bq2429x_disable_otg functions, an additional pin bq2429x_params_t::otg_pin can be set to control it also by hardware and these functions will take care of setting it.

To enable/disable charge the functions bq2429x_enable_charge and bq2429x_disable_charge can be used, and as with the OTG an additional pin bq2429x_params_t::ce_pin can be set to control it also by hardware and these functions will take care of setting it.

When a change happens on the FAULT registers of the device the BQ2429x device generates an interrupt to inform when that happens, this functionality has to be enabled with the bq2429x_int module and can be used with the bq2429x_init_int functions.

Files
file	bq2429x_internal.h
	Internal address, registers, constants for the BQ2429x family power ICs.

file	bq2429x_params.h
	Default configuration for BQ2429x power ICs.

file	bq2429x.h
	Device driver interface for the BQ2429x Single-Cell USB Charger.

Data Structures
struct	bq2429x_status_t
	Device status. More...

struct	bq2429x_fault_t
	Device faults. More...

struct	bq2429x_params_t
	BQ2429x device parameters. More...

struct	bq2429x_t
	BQ2429x device descriptor. More...

Typedefs
typedef void(*	bq2429x_int_cb_t) (void *)
	Callback function for BQ2429x interrupts.

Enumerations
enum	{ BQ2429X_OK = 0 , BQ2429X_ERR_I2C = -1 , BQ2429X_ERR_GPIO = -2 }
	Driver return values. More...

enum	bq2429x_vbus_stat_t { BQ2429X_VBUS_NONE = 0 , BQ2429X_VBUS_USB_CHARGER , BQ2429X_VBUS_AP_CHARGER , BQ2429X_VBUS_OTG }
	Used VBUS type. More...

enum	bq2429x_chrg_stat_t { BQ2429X_CHARGE_NONE = 0 , BQ2429X_CHARGE_PRE , BQ2429X_CHARGE_FAST , BQ2429X_CHARGE_DONE }
	Battery charging status. More...

enum	bq2429x_chrg_fault_t { BQ2429x_CHRG_FAULT_NORMAL = 0 , BQ2429x_CHRG_FAULT_INPUT , BQ2429x_CHRG_FAULT_THERMAL_SHUTDOWN , BQ2429x_CHRG_FAULT_CHARGE_TIMER_EXPIRATION }
	Charge fault values. More...

enum	bq2429x_input_voltage_limit_t { BQ2429X_VLIM_3880 = 0 , BQ2429X_VLIM_3960 , BQ2429X_VLIM_4040 , BQ2429X_VLIM_4120 , BQ2429X_VLIM_4200 , BQ2429X_VLIM_4280 , BQ2429X_VLIM_4360 , BQ2429X_VLIM_4440 , BQ2429X_VLIM_4520 , BQ2429X_VLIM_4600 , BQ2429X_VLIM_4680 , BQ2429X_VLIM_4760 , BQ2429X_VLIM_4840 , BQ2429X_VLIM_4920 , BQ2429X_VLIM_5000 , BQ2429X_VLIM_5080 }
	Input Voltage Limit (VLIM). More...

enum	bq2429x_input_current_limit_t { BQ2429X_ILIM_100 = 0 , BQ2429X_ILIM_150 , BQ2429X_ILIM_500 , BQ2429X_ILIM_900 , BQ2429X_ILIM_1000 , BQ2429X_ILIM_1500 , BQ2429X_ILIM_2000 , BQ2429X_ILIM_3000 }
	Input Current Limit (ILIM). More...

enum	bq2429x_charge_current_t { BQ2429X_ICHG_512 = 0 , BQ2429X_ICHG_1024 = 8 , BQ2429X_ICHG_2048 = 24 , BQ2429X_ICHG_3008 = 39 , BQ2429X_ICHG_4032 = 55 , BQ2429X_ICHG_4544 = 63 }
	Charge Current (ICHG) More...

enum	bq2429x_charge_voltage_limit_t { BQ2429X_VREG_3504 = 0 , BQ2429X_VREG_3600 = 6 , BQ2429X_VREG_3808 = 19 , BQ2429X_VREG_3904 = 25 , BQ2429X_VREG_4000 = 31 , BQ2429X_VREG_4112 = 38 , BQ2429X_VREG_4208 = 44 , BQ2429X_VREG_4304 = 50 , BQ2429X_VREG_4352 = 53 , BQ2429X_VREG_4400 = 56 }
	Charge Voltage Limit (VREG). More...

Functions
int	bq2429x_init (bq2429x_t dev, const bq2429x_params_t params)
	Initialize device.

int	bq2429x_init_int (bq2429x_t dev, bq2429x_int_cb_t cb, void arg)
	Initialize interrupt support for the device.

int	bq2429x_get_status (const bq2429x_t dev, bq2429x_status_t status)
	Get device status.

int	bq2429x_get_fault (const bq2429x_t dev, bq2429x_fault_t fault)
	Get device faults.

int	bq2429x_enable_otg (const bq2429x_t *dev)
	Enable OTG.

int	bq2429x_disable_otg (const bq2429x_t *dev)
	Disable OTG.

int	bq2429x_enable_charge (const bq2429x_t *dev)
	Enable battery charging.

int	bq2429x_disable_charge (const bq2429x_t *dev)
	Disable battery charging.

int	bq2429x_set_vlim (bq2429x_t *dev, bq2429x_input_voltage_limit_t vlim)
	Set Input Voltage Limit.

int	bq2429x_get_vlim (const bq2429x_t dev, bq2429x_input_voltage_limit_t vlim)
	Get Input Voltage Limit.

int	bq2429x_set_ilim (bq2429x_t *dev, bq2429x_input_current_limit_t ilim)
	Set Input Current Limit.

int	bq2429x_get_ilim (const bq2429x_t dev, bq2429x_input_current_limit_t ilim)
	Get Input Current Limit.

int	bq2429x_set_ichg (bq2429x_t *dev, bq2429x_charge_current_t ichg)
	Set Charge Current.

int	bq2429x_get_ichg (const bq2429x_t dev, bq2429x_charge_current_t ichg)
	Get Charge Current.

int	bq2429x_set_vreg (bq2429x_t *dev, bq2429x_charge_voltage_limit_t vreg)
	Set Charge Voltage Limit.

int	bq2429x_get_vreg (const bq2429x_t dev, bq2429x_charge_voltage_limit_t vreg)
	Get Charge Voltage Limit.

Typedef Documentation

◆ bq2429x_int_cb_t

typedef void(* bq2429x_int_cb_t) (void *)

Callback function for BQ2429x interrupts.

Definition at line 282 of file bq2429x.h.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Driver return values.

Enumerator
BQ2429X_OK	Everything is ok.
BQ2429X_ERR_I2C	I2C error.
BQ2429X_ERR_GPIO	GPIO initialization error.

Definition at line 67 of file bq2429x.h.

◆ bq2429x_charge_current_t

enum bq2429x_charge_current_t

Charge Current (ICHG)

Enumerator
BQ2429X_ICHG_512	512 mA
BQ2429X_ICHG_1024	1024 mA
BQ2429X_ICHG_2048	2048 mA
BQ2429X_ICHG_3008	4032 mA
BQ2429X_ICHG_4032	4544 mA

Definition at line 215 of file bq2429x.h.

◆ bq2429x_charge_voltage_limit_t

enum bq2429x_charge_voltage_limit_t

Charge Voltage Limit (VREG).

Enumerator
BQ2429X_VREG_3504	3504 mV
BQ2429X_VREG_3600	3600 mV
BQ2429X_VREG_3808	3808 mV
BQ2429X_VREG_3904	3904 mV
BQ2429X_VREG_4000	4000 mV
BQ2429X_VREG_4112	4112 mV
BQ2429X_VREG_4208	4208 mV
BQ2429X_VREG_4304	4304 mV
BQ2429X_VREG_4352	4352 mV
BQ2429X_VREG_4400	4400 mV

Definition at line 227 of file bq2429x.h.

◆ bq2429x_chrg_fault_t

enum bq2429x_chrg_fault_t

Charge fault values.

Enumerator
BQ2429x_CHRG_FAULT_NORMAL	No fault, normal.
BQ2429x_CHRG_FAULT_INPUT	Input fault (OVP or bad source)
BQ2429x_CHRG_FAULT_THERMAL_SHUTDOWN	Thermal shutdown.
BQ2429x_CHRG_FAULT_CHARGE_TIMER_EXPIRATION	Charge timer expiration.

Definition at line 129 of file bq2429x.h.

◆ bq2429x_chrg_stat_t

enum bq2429x_chrg_stat_t

Battery charging status.

Enumerator
BQ2429X_CHARGE_NONE	The device is not charging a battery.
BQ2429X_CHARGE_PRE	Pre-charge state.
BQ2429X_CHARGE_FAST	Fast charging.
BQ2429X_CHARGE_DONE	Charging done.

Definition at line 86 of file bq2429x.h.

◆ bq2429x_input_current_limit_t

enum bq2429x_input_current_limit_t

Input Current Limit (ILIM).

Enumerator
BQ2429X_ILIM_100	100 mA
BQ2429X_ILIM_150	150 mA
BQ2429X_ILIM_500	500 mA
BQ2429X_ILIM_900	900 mA
BQ2429X_ILIM_1000	1000 mA
BQ2429X_ILIM_1500	1500 mA
BQ2429X_ILIM_2000	2000 mA
BQ2429X_ILIM_3000	3000 mA

Definition at line 201 of file bq2429x.h.

◆ bq2429x_input_voltage_limit_t

enum bq2429x_input_voltage_limit_t

Input Voltage Limit (VLIM).

Enumerator
BQ2429X_VLIM_3880	3880 mV
BQ2429X_VLIM_3960	3960 mV
BQ2429X_VLIM_4040	4040 mV
BQ2429X_VLIM_4120	4120 mV
BQ2429X_VLIM_4200	4200 mV
BQ2429X_VLIM_4280	4280 mV
BQ2429X_VLIM_4360	4360 mV
BQ2429X_VLIM_4440	4440 mV
BQ2429X_VLIM_4520	4520 mV
BQ2429X_VLIM_4600	4600 mV
BQ2429X_VLIM_4680	4680 mV
BQ2429X_VLIM_4760	4760 mV
BQ2429X_VLIM_4840	4840 mV
BQ2429X_VLIM_4920	4920 mV
BQ2429X_VLIM_5000	5000 mV
BQ2429X_VLIM_5080	5080 mV

Definition at line 179 of file bq2429x.h.

◆ bq2429x_vbus_stat_t

enum bq2429x_vbus_stat_t

Used VBUS type.

Enumerator
BQ2429X_VBUS_NONE	No input source detected.
BQ2429X_VBUS_USB_CHARGER	USB charger input.
BQ2429X_VBUS_AP_CHARGER	Adapter port charge input.
BQ2429X_VBUS_OTG	VBUS is used for OTG.

Definition at line 76 of file bq2429x.h.

Function Documentation

◆ bq2429x_disable_charge()

int bq2429x_disable_charge ( const bq2429x_t * dev )

Disable battery charging.

Precondition: dev != NULL

Parameters

[in] dev Device descriptor.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_disable_otg()

int bq2429x_disable_otg ( const bq2429x_t * dev )

Disable OTG.

Precondition: dev != NULL

Parameters

[in] dev Device descriptor.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_enable_charge()

int bq2429x_enable_charge ( const bq2429x_t * dev )

Enable battery charging.

Precondition: dev != NULL

Parameters

[in] dev Device descriptor.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_enable_otg()

int bq2429x_enable_otg ( const bq2429x_t * dev )

Enable OTG.

This allows powering USB devices from the same port, i.e. to provide power or charge other devices.

Note: This will disable charging of the battery, if previously bq2429x_enable_charge was called, to enable charge again only disable OTG mode with bq2429x_disable_otg.

Precondition: dev != NULL

Parameters

[in] dev Device descriptor.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_get_fault()

int bq2429x_get_fault	(	const bq2429x_t *	dev,
		bq2429x_fault_t *	fault
	)

Get device faults.

Precondition: dev != NULL && fault != NULL

Parameters

[in]	dev	Device descriptor.
[out]	fault	Pointer where device faults will be stored.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C error.

◆ bq2429x_get_ichg()

int bq2429x_get_ichg	(	const bq2429x_t *	dev,
		bq2429x_charge_current_t *	ichg
	)

Get Charge Current.

Precondition: dev != NULL && ichg != NULL

Parameters

[in]	dev	Device descriptor.
[out]	ichg	Charge current.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_get_ilim()

int bq2429x_get_ilim	(	const bq2429x_t *	dev,
		bq2429x_input_current_limit_t *	ilim
	)

Get Input Current Limit.

Precondition: dev != NULL && ilim != NULL

Parameters

[in]	dev	Device descriptor.
[out]	ilim	Current limit.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_get_status()

int bq2429x_get_status	(	const bq2429x_t *	dev,
		bq2429x_status_t *	status
	)

Get device status.

Precondition: dev != NULL && status != NULL

Parameters

[in]	dev	Device descriptor.
[out]	status	Pointer where device status will be stored.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C error.

◆ bq2429x_get_vlim()

int bq2429x_get_vlim	(	const bq2429x_t *	dev,
		bq2429x_input_voltage_limit_t *	vlim
	)

Get Input Voltage Limit.

Precondition: dev != NULL && vlim != NULL

Parameters

[in]	dev	Device descriptor.
[out]	vlim	Voltage limit.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_get_vreg()

int bq2429x_get_vreg	(	const bq2429x_t *	dev,
		bq2429x_charge_voltage_limit_t *	vreg
	)

Get Charge Voltage Limit.

Precondition: dev != NULL && vreg != NULL

Parameters

[in]	dev	Device descriptor.
[out]	vreg	Voltage limit.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_init()

int bq2429x_init	(	bq2429x_t *	dev,
		const bq2429x_params_t *	params
	)

Initialize device.

Precondition: dev != NULL && params != NULL

Parameters

[out]	dev	Device descriptor.
[in]	params	Device parameters.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.; BQ2429X_ERR_GPIO on GPIO initialization failure (CE or OTG pin failed).

◆ bq2429x_init_int()

int bq2429x_init_int	(	bq2429x_t *	dev,
		bq2429x_int_cb_t	cb,
		void *	arg
	)

Initialize interrupt support for the device.

Precondition: dev != NULL && cb != NULL

The callback cb is called in an ISR context, so keep in mind that heavy work shouldn't be done there.

Note: bq2429x_init MUST have been called before!

Parameters

[in]	dev	Device descriptor.
[in]	cb	Callback called on interrupt.
[in]	arg	Argument to be passed when the callback is called.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_GPIO on GPIO initialization failure.

◆ bq2429x_set_ichg()

int bq2429x_set_ichg	(	bq2429x_t *	dev,
		bq2429x_charge_current_t	ichg
	)

Set Charge Current.

Precondition: dev != NULL

Parameters

[in]	dev	Device descriptor.
[in]	ichg	Charge current.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_set_ilim()

int bq2429x_set_ilim	(	bq2429x_t *	dev,
		bq2429x_input_current_limit_t	ilim
	)

Set Input Current Limit.

Sets the maximum current limit, this limit is also limited by hardware by setting a resistor to the VLIM pin which sets (by hardware) the upper limit.

Precondition: dev != NULL

Parameters

[in]	dev	Device descriptor.
[in]	ilim	Current limit.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_set_vlim()

int bq2429x_set_vlim	(	bq2429x_t *	dev,
		bq2429x_input_voltage_limit_t	vlim
	)

Set Input Voltage Limit.

Note: This is a limit on the lower bound of the voltage, for example, if the VLIM is set to BQ2429X_VLIM_5000 (5.0V) and the supply voltage is lower than it (4.8V), it will result in a fault and no power will be delivered through the output pin (SYS pin).

Precondition: dev != NULL

Parameters

[in]	dev	Device descriptor.
[in]	vlim	Voltage limit.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

◆ bq2429x_set_vreg()

int bq2429x_set_vreg	(	bq2429x_t *	dev,
		bq2429x_charge_voltage_limit_t	vreg
	)

Set Charge Voltage Limit.

Precondition: dev != NULL

Parameters

[in]	dev	Device descriptor.
[in]	vreg	Voltage limit.

Returns: BQ2429X_OK on success.; BQ2429X_ERR_I2C on I2C failure.

Detailed Description

Files

Data Structures

Typedefs

Enumerations

Functions

Typedef Documentation

◆ bq2429x_int_cb_t

Enumeration Type Documentation

◆ anonymous enum

◆ bq2429x_charge_current_t

◆ bq2429x_charge_voltage_limit_t

◆ bq2429x_chrg_fault_t

◆ bq2429x_chrg_stat_t

◆ bq2429x_input_current_limit_t

◆ bq2429x_input_voltage_limit_t

◆ bq2429x_vbus_stat_t

Function Documentation

◆ bq2429x_disable_charge()

◆ bq2429x_disable_otg()

◆ bq2429x_enable_charge()

◆ bq2429x_enable_otg()

◆ bq2429x_get_fault()

◆ bq2429x_get_ichg()

◆ bq2429x_get_ilim()

◆ bq2429x_get_status()

◆ bq2429x_get_vlim()

◆ bq2429x_get_vreg()

◆ bq2429x_init()

◆ bq2429x_init_int()

◆ bq2429x_set_ichg()

◆ bq2429x_set_ilim()

◆ bq2429x_set_vlim()

◆ bq2429x_set_vreg()