SDIO

You can use this module to access the SDIO and enable the driver to operate an SDIO-compliant device. These capabilities include reading and writing data based on SDIO, setting the block size, applying for and releasing interrupts, enabling and disabling devices, and occupying and releasing the bus.

Since:

1.0

Summary

Files

Data Structures

Data Structure Name	Description
	Defines the SDIO capabilities.
SdioCommonInfo	Defines SDIO common information.

Typedefs

Typedef Name	Description
(void *)	typedef void Defines the function type of an SDIO IRQ.

Typedef Name

Description

(void *)

typedef void

Defines the function type of an SDIO IRQ.

Enumerations

Enumeration Name	Description
SdioCommonInfoType { = 0, SDIO_OTHER_INFO }	Enumerates SDIO common information types.

Functions

Function Name	Description
(int16_t busNum)	struct DevHandle Opens an SDIO controller with a specified bus number.
(struct DevHandle handle)	void Closes an SDIO controller.
(struct DevHandle handle, uint8_t data, uint32_t addr, uint32_t size, uint32_t timeOut)	int32_t Incrementally reads a given length of data from the specified SDIO address.
(struct DevHandle handle, uint8_t data, uint32_t addr, uint32_t size, uint32_t timeOut)	int32_t Incrementally writes a given length of data into the specified SDIO address.
(struct DevHandle handle, uint8_t data, uint32_t addr, uint32_t size, uint32_t timeOut)	int32_t Reads a given length of data from the fixed SDIO address.
(struct DevHandle handle, uint8_t data, uint32_t addr, uint32_t size, uint32_t timeOut)	int32_t Writes a given length of data into the fixed SDIO address.
(struct DevHandle handle, uint8_t data, uint32_t addr, uint32_t size, uint32_t timeOut)	int32_t Reads a given length of data from the address space of SDIO function 0.
(struct DevHandle handle, uint8_t data, uint32_t addr, uint32_t size, uint32_t timeOut)	int32_t Writes a given length of data into the address space of SDIO function 0.
(struct DevHandle handle, uint32_t blockSize)	int32_t Sets the block size.
(struct DevHandle handle, info, SdioCommonInfoType infoType)	int32_t Obtains common information.
(struct DevHandle handle, info, SdioCommonInfoType infoType)	int32_t Sets common information.
(struct DevHandle handle)	int32_t Flushes data.
(struct DevHandle handle)	void Claims a host exclusively.
(struct DevHandle handle)	void Releases the exclusively claimed host.
(struct DevHandle handle)	int32_t Enables the SDIO device so that its register can be accessed.
(struct DevHandle handle)	int32_t Disables the SDIO device.
(struct DevHandle handle, irqHandler)	int32_t Claims an SDIO IRQ.
SdioReleaseIrq (struct *handle)	int32_t Releases an SDIO IRQ.

Details

Typedef Documentation

SdioIrqHandler

Defines the function type of an SDIO IRQ.

This function is registered when you call to request the SDIO IRQ.

Parameters:

Name	Description
data	Indicates the private data passed to this IRQ (The data is specified when the IRQ is registered).

SdioCommonInfoType

Description:

Enumerates SDIO common information types.

When obtaining SDIO common information by calling SdioGetCommonInfo or setting the information by calling , you need to pass the information type.

Enumerator	Description
SDIO_FUNC_INFO	Functionality information
SDIO_OTHER_INFO	Other information

Function Documentation

SdioClaimHost()

void SdioClaimHost (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle)

Description:

Claims a host exclusively.

You can call this function to enable the SDIO module to exclusively claim a host and then perform operations on the devices connected to the host. After performing required operations, release the host by calling .

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by .

SdioClaimIrq()

int32_t SdioClaimIrq (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, [SdioIrqHandler]($api-api-SmartVision-Devices-SDIO.md#ga858bec274683a4f50d53d1f9f43d204b) * irqHandler )

Description:

Claims an SDIO IRQ.

When there is data, commands, or events, the IRQ function is executed.

Parameters:

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioClose()

void SdioClose (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle)

Description:

Closes an SDIO controller.

After the SDIO interface is used, you can close the SDIO controller by calling . This function is used in pair with SdioOpen.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller.

SdioDisableFunc()

int32_t SdioDisableFunc (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle)

Description:

Disables the SDIO device.

This function is used in pair with .

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by .

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioEnableFunc()

Description:

Enables the SDIO device so that its register can be accessed.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioFlushData()

Description:

Flushes data.

You can call this function when an SDIO needs to be reinitialized or an unexpected error occurs.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by .

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioGetCommonInfo()

int32_t SdioGetCommonInfo (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, [SdioCommonInfo]($api-api-SmartVision-Devices-SdioCommonInfo.md) * info, [SdioCommonInfoType]($api-api-SmartVision-Devices-SDIO.md#ga4037437ac001a9848dd242e8aa632678) infoType )

Description:

Obtains common information.

You can call this function to obtain the capabilities and private data of the I/O function.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.
info	Indicates the pointer to the common information to be obtained. For details, see .
infoType	Indicates the type of the common information to be obtained. For details, see SdioCommonInfoType.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md)* SdioOpen (int16_t busNum)

Description:

Opens an SDIO controller with a specified bus number.

Before using the SDIO interface, you can obtain the device handle of the SDIO controller by calling . This function is used in pair with SdioClose.

Parameters:

Name	Description
busNum	Indicates the bus number.

Returns:

Returns the device handle DevHandle of the SDIO controller if the operation is successful; returns NULL otherwise.

SdioReadBytes()

int32_t SdioReadBytes (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, uint8_t * data, uint32_t addr, uint32_t size, uint32_t timeOut )

Description:

Incrementally reads a given length of data from the specified SDIO address.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by .
data	Indicates the pointer to the data to read.
addr	Indicates the start address of the data to read.
size	Indicates the length of the data to read.
timeOut	Indicates the timeout duration for reading data, in milliseconds. If the value is 0,the default value is used. The default value varies according to the application. Generally, the default value is 1 second.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioReadBytesFromFixedAddr()

int32_t SdioReadBytesFromFixedAddr (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, uint8_t * data, uint32_t addr, uint32_t size, uint32_t timeOut )

Description:

Reads a given length of data from the fixed SDIO address.

If the length of the data to read is greater than the size of a block, the data is read by block, and the remaining data that is smaller than one block is read by byte. Otherwise, data is read by byte.

Parameters:

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioReadBytesFromFunc0()

Description:

Reads a given length of data from the address space of SDIO function 0.

Currently, only one byte of data can be read.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.
data	Indicates the pointer to the data to read.
addr	Indicates the start address of the data to read.
size	Indicates the length of the data to read.
timeOut	Indicates the timeout duration for reading data, in milliseconds. If the value is 0, the default value is used. The default value varies according to the application. Generally, the default value is 1 second.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioReleaseHost()

Description:

Releases the exclusively claimed host.

This function is used in pair with SdioClaimHost.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.

SdioReleaseIrq()

int32_t SdioReleaseIrq (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle)

Description:

Releases an SDIO IRQ.

This function is used in pair with SdioClaimIrq.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioSetBlockSize()

int32_t SdioSetBlockSize (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, uint32_t blockSize )

Description:

Sets the block size.

If data to read or write is performed, use this function to set the block size.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by .
blockSize	Indicates the block size to be set. If the value is 0, the default value is used. The value ranges from 1 to 2048 bytes.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioSetCommonInfo()

int32_t SdioSetCommonInfo (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, [SdioCommonInfo]($api-api-SmartVision-Devices-SdioCommonInfo.md) * info, [SdioCommonInfoType]($api-api-SmartVision-Devices-SDIO.md#ga4037437ac001a9848dd242e8aa632678) infoType )

Description:

Sets common information.

You can call this function to set the maximum timeout duration and private data.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.
info	Indicates the pointer to the common information to be set. For details, see .
infoType	Indicates the type of the common information to be set. For details, see SdioCommonInfoType.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioWriteBytes()

int32_t SdioWriteBytes (struct [DevHandle]($api-api-SmartVision-Devices-DevHandle.md) * handle, uint8_t * data, uint32_t addr, uint32_t size, uint32_t timeOut )

Description:

Incrementally writes a given length of data into the specified SDIO address.

If the length of the data to write is greater than the size of a block, the data is written by block first, and the remaining data that is smaller than one block is written by byte. Otherwise, data is written by byte.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by .
data	Indicates the pointer to the data to write.
addr	Indicates the start address of the data to write.
size	Indicates the length of the data to write.
timeOut	Indicates the timeout duration for writing data, in milliseconds. If the value is 0, the default value is used. The default value varies according to the application. Generally, the default value is 1 second.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

SdioWriteBytesToFixedAddr()

Description:

Writes a given length of data into the fixed SDIO address.

Parameters:

Name	Description
handle	Indicates the pointer to the device handle of the SDIO controller obtained by SdioOpen.
data	Indicates the pointer to the data to write.
addr	Indicates the fixed address of the data to write.
size	Indicates the length of the data to write.
timeOut	Indicates the timeout duration for writing data, in milliseconds. If the value is 0, the default value is used. The default value varies according to the application. Generally, the default value is 1 second.

Returns:

Returns 0 if the operation is successful; returns a negative value if the operation fails.

Description:

Writes a given length of data into the address space of SDIO function 0.

Currently, only one byte of data can be written.

Parameters:

Returns 0 if the operation is successful; returns a negative value if the operation fails.