Functions

General Description

API Reference
	Application Management
	DFU functions for the application management.
	Memory Operations
	DFU functions for memory operations These IO functions have to be re-implemented in the user's code.
	Transport Management
	DFU functions for the communication interface.
	Custom commands
	The DFU protocol provides a set of pre-defined commands.

Functions
cy_en_dfu_status_t	Cy_DFU_Init (uint32_t *state, cy_stc_dfu_params_t *params)
	This function starts the application download and install operations. More...
cy_en_dfu_status_t	Cy_DFU_Continue (uint32_t *state, cy_stc_dfu_params_t *params)
	The function processes Host Commands according to Host Command/Response Protocol. More...
uint32_t	Cy_DFU_DataChecksum (const uint8_t *address, uint32_t length, cy_stc_dfu_params_t *params)
	This function computes a CRC-32C for the provided number of bytes contained in the provided buffer. More...

Function Documentation

Cy_DFU_Init()

cy_en_dfu_status_t Cy_DFU_Init	(	uint32_t *	state,
		cy_stc_dfu_params_t *	params
	)

This function starts the application download and install operations.

Make subsequent calls to Cy_DFU_Continue() to continue the process.
Returns immediately, reporting success or failure.
Only one updating operation can be done at a time - the user's code must ensure this.

Parameters

state	The pointer to a state variable, that is updated by the function. See DFU State
params	The pointer to a DFU parameters structure See cy_stc_dfu_params_t

Returns

See cy_en_dfu_status_t.

• CY_DFU_SUCCESS if successful.
• CY_DFU_ERROR_UNKNOWN either parameter is a NULL pointer.

static cy_stc_dfu_params_t dfuParams;
static cy_en_dfu_status_t dfuStatus;

/*
* DFU state, one of the:
* - CY_DFU_STATE_NONE
* - CY_DFU_STATE_UPDATING
* - CY_DFU_STATE_FINISHED
* - CY_DFU_STATE_FAILED
*/
static uint32_t state = CY_DFU_STATE_NONE;

/* Timeout for Cy_DFU_Continue(), in milliseconds */
static const uint32_t paramsTimeout = 20U;

/* Buffer to store DFU commands */
CY_ALIGN(4) static uint8_t buffer[CY_DFU_SIZEOF_DATA_BUFFER];

/* Buffer for DFU data packets for transport API */
CY_ALIGN(4) static uint8_t packet[CY_DFU_SIZEOF_CMD_BUFFER];

    /* Initialize dfuParams structure */
    dfuParams.timeout          = paramsTimeout;
    dfuParams.dataBuffer       = &buffer[0];
    dfuParams.packetBuffer     = &packet[0];

    dfuStatus = Cy_DFU_Init(&state, &dfuParams);

    if (CY_DFU_SUCCESS != dfuStatus)
    {
        CY_DFU_LOG_ERR("DFU initialization is failed");
        /* Stop program execution if DFU init failed */
        CY_ASSERT(0U);
    }

Cy_DFU_Continue()

cy_en_dfu_status_t Cy_DFU_Continue	(	uint32_t *	state,
		cy_stc_dfu_params_t *	params
	)

The function processes Host Commands according to Host Command/Response Protocol.

The function waits for the Host data packet till timeout occurs. If valid packet is received, it decodes received command, processes it and transfer back a response if needed. See description of Host Command/Response Protocol in AN213924 DFU SDK User Guide.

Parameters

state	The pointer to a state variable, that is updated by the function. See DFU State.
params	The pointer to a DFU parameters structure. See cy_stc_dfu_params_t.

Returns

See cy_en_dfu_status_t

Cy_DFU_DataChecksum()

uint32_t Cy_DFU_DataChecksum	(	const uint8_t *	address,
		uint32_t	length,
		cy_stc_dfu_params_t *	params
	)

This function computes a CRC-32C for the provided number of bytes contained in the provided buffer.

This function is used to validate the Program Data and Verify Data DFU commands and a metadata row.

Parameters

address	The pointer to a buffer containing the data to compute the checksum for.
length	The number of bytes in the buffer to compute the checksum for.
params	The pointer to a DFU parameters structure. See cy_stc_dfu_params_t .

Returns

CRC-32C for the provided data.