COMP (LP Comparator block)

General Description

Implementation of the analog comparator (COMP) driver on top of the LP (low power) comparator.

Functions
cy_rslt_t	_cyhal_comp_lp_init (cyhal_comp_t *obj, cyhal_gpio_t vin_p, cyhal_gpio_t vin_m, cyhal_gpio_t output, cyhal_comp_config_t *cfg)
	Initialize the Comparator peripheral for a LP-based comparator. More...
void	_cyhal_comp_lp_free (cyhal_comp_t *obj)
	Deinitialize the Comparator peripheral for a LP-based comparator. More...
cy_rslt_t	_cyhal_comp_lp_set_power (cyhal_comp_t *obj, cyhal_power_level_t power)
	Changes the current operating power level of the comparator for a LP-based comparator. More...
cy_rslt_t	_cyhal_comp_lp_configure (cyhal_comp_t *obj, cyhal_comp_config_t *cfg)
	Reconfigure the Comparator for a LP-based comparator. More...
bool	_cyhal_comp_lp_read (cyhal_comp_t *obj)
	Reads the Comparator state for a LP-based comparator. More...
void	_cyhal_comp_lp_enable_event (cyhal_comp_t *obj, cyhal_comp_event_t event, uint8_t intr_priority, bool enable)
	Enable or Disable a Comparator event for a LP-based comparator. More...

Function Documentation

_cyhal_comp_lp_init()

cy_rslt_t _cyhal_comp_lp_init	(	cyhal_comp_t *	obj,
		cyhal_gpio_t	vin_p,
		cyhal_gpio_t	vin_m,
		cyhal_gpio_t	output,
		cyhal_comp_config_t *	cfg
	)

Initialize the Comparator peripheral for a LP-based comparator.

Parameters

[out]	obj	Pointer to a Comparator object. The caller must allocate the memory for this object but the init function will initialize its contents.
[in]	vin_p	Non-inverting input pin
[in]	vin_m	Inverting input pin
[in]	output	Comparator output pin. May be NC.
[in]	cfg	Configuration structure

Returns

The status of the init request

_cyhal_comp_lp_free()

void _cyhal_comp_lp_free

(

cyhal_comp_t *

obj

)

Deinitialize the Comparator peripheral for a LP-based comparator.

Parameters

[in]

obj

Comparator object

_cyhal_comp_lp_set_power()

cy_rslt_t _cyhal_comp_lp_set_power	(	cyhal_comp_t *	obj,
		cyhal_power_level_t	power
	)

Changes the current operating power level of the comparator for a LP-based comparator.

If the power level is set to CYHAL_POWER_LEVEL_OFF, the comparator will be powered-off but it will retain its configuration, so it is not necessary to reconfigure it when changing the power level from CYHAL_POWER_LEVEL_OFF to any other value.

Parameters

[in]	obj	Comparator object
[in]	power	The power level to set

Returns

The status of the set power request

_cyhal_comp_lp_configure()

cy_rslt_t _cyhal_comp_lp_configure	(	cyhal_comp_t *	obj,
		cyhal_comp_config_t *	cfg
	)

Reconfigure the Comparator for a LP-based comparator.

This retains the powered state of the comparator. Depending on the implementation, it may be necessary to temporarily deconfigure and/or power off the comparator in order to apply the new configuration. However, if the comparator is powered-off when this function is called, it will remain powered-off after it returns. Likewise, if the comparator is powered-on when this function is called, it will remain powered-on after it returns.

Parameters

[in]	obj	Comparator object
[in]	cfg	New configuration to apply

Returns

The status of the configure request

_cyhal_comp_lp_read()

bool _cyhal_comp_lp_read

(

cyhal_comp_t *

obj

)

Reads the Comparator state for a LP-based comparator.

Parameters

[in]

obj

Comparator object

Returns

The Comparator state. True if the non-inverting pin voltage is greater than the inverting pin voltage, false otherwise.

_cyhal_comp_lp_enable_event()

void _cyhal_comp_lp_enable_event	(	cyhal_comp_t *	obj,
		cyhal_comp_event_t	event,
		uint8_t	intr_priority,
		bool	enable
	)

Enable or Disable a Comparator event for a LP-based comparator.

When an enabled event occurs, the function specified by cyhal_comp_register_callback will be called.

Parameters

[in]	obj	Comparator object
[in]	event	Comparator event
[in]	intr_priority	Priority for NVIC interrupt events
[in]	enable	True to turn on event, False to turn off