HWMGR (Hardware Manager)

General Description

High level interface to the Hardware Manager.

Features

• Allows HAL drivers or application firmware to mark specific hardware resources as reserved. When this is done, other reservation requests for the same resource will be denied.
• For resources which are interchangeable such as clock dividers, provides allocation and reservation of an available instance.

Quick Start

• cyhal_hwmgr_init is used to initialize the hardware manager to keep track of resources being used.
• cyhal_hwmgr_reserve reserves a specified resource if available.
• cyhal_hwmgr_free frees the specified resource.
• cyhal_hwmgr_allocate can be used to allocate a free block of specified resource, if available.

Code snippets

Snippet 1: Freeing a block used by PDL or configurators

The following snippet shows how a specific resource used directly in PDL or the configurators can be freed so that it can be used by HAL.

    // The resource that is being used
    cyhal_resource_inst_t resource =
    {
        .type        = CYHAL_RSC_TCPWM,
        .block_num   = 0,
        .channel_num = 3
    };

    // Use resource directly in PDL or configurators

    // If the resource is no longer needed and can be used by the HAL, free the resource in Hardware
    // Manager
    cyhal_hwmgr_free(&resource);

    // Disconnect any interconnects used between resources and pin
    _cyhal_utils_disconnect_and_free(P0_0);

    // resource can now be used by HAL

API Reference
	HWMGR HAL Results
	HWMGR specific return codes.

Functions
cy_rslt_t	cyhal_hwmgr_init (void)
	Initializes the hardware manager to keep track of what resources are being used. More...
cy_rslt_t	cyhal_hwmgr_reserve (const cyhal_resource_inst_t *obj)
	Reserve the specified resource. More...
void	cyhal_hwmgr_free (const cyhal_resource_inst_t *obj)
	Free the specified resource to allow it to be reused. More...
cy_rslt_t	cyhal_hwmgr_allocate (cyhal_resource_t type, cyhal_resource_inst_t *obj)
	Allocates a free block of the specified type if available This function is used when the exact block number and channel number of the resource is not known. More...

Function Documentation

cyhal_hwmgr_init()

cy_rslt_t cyhal_hwmgr_init

(

void

)

Initializes the hardware manager to keep track of what resources are being used.

Returns

The status of the init request

cyhal_hwmgr_reserve()

cy_rslt_t cyhal_hwmgr_reserve

(

const cyhal_resource_inst_t *

obj

)

Reserve the specified resource.

The exact block number and channel number must be specified. If this is not know, use cyhal_hwmgr_allocate.

Note

This function is called by the init function of hardware blocks. Calling this again for the same block will result in error since the hardware block is already marked as consumed.

Parameters

[in]

obj

The resource object that should be reserved

Returns

The status of the reserve request

See Snippet 1: Freeing a block used by PDL or configurators

cyhal_hwmgr_free()

void cyhal_hwmgr_free

(

const cyhal_resource_inst_t *

obj

)

Free the specified resource to allow it to be reused.

Parameters

[in,out]

obj

The resource object to free

See Snippet 1: Freeing a block used by PDL or configurators

cyhal_hwmgr_allocate()

cy_rslt_t cyhal_hwmgr_allocate	(	cyhal_resource_t	type,
		cyhal_resource_inst_t *	obj
	)

Allocates a free block of the specified type if available This function is used when the exact block number and channel number of the resource is not known.

This function loops through all available resource of the specified type and assigns the resource if available. This function internally calls cyhal_hwmgr_reserve function and hence, it should not be called again.

Parameters

[in]	type	The type of resource to allocate.
[out]	obj	The resource object.

Returns

The status of the allocate request.