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RTEMS 6.1-rc4
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RTEMS 6.1-rc4
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Data Structures | |
| struct | _lpi2c_master_edma_handle |
| Driver handle for master DMA APIs. More... | |
Driver version | |
| typedef struct _lpi2c_master_edma_handle | lpi2c_master_edma_handle_t |
| typedef void(* | lpi2c_master_edma_transfer_callback_t) (LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, status_t completionStatus, void *userData) |
| Master DMA completion callback function pointer type. | |
Master DMA | |
| void | LPI2C_MasterCreateEDMAHandle (LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, edma_handle_t *rxDmaHandle, edma_handle_t *txDmaHandle, lpi2c_master_edma_transfer_callback_t callback, void *userData) |
| Create a new handle for the LPI2C master DMA APIs. | |
| status_t | LPI2C_MasterTransferEDMA (LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, lpi2c_master_transfer_t *transfer) |
| Performs a non-blocking DMA-based transaction on the I2C bus. | |
| status_t | LPI2C_MasterTransferGetCountEDMA (LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, size_t *count) |
| Returns number of bytes transferred so far. | |
| status_t | LPI2C_MasterTransferAbortEDMA (LPI2C_Type *base, lpi2c_master_edma_handle_t *handle) |
| Terminates a non-blocking LPI2C master transmission early. | |
| typedef void(* lpi2c_master_edma_transfer_callback_t) (LPI2C_Type *base, lpi2c_master_edma_handle_t *handle, status_t completionStatus, void *userData) |
Master DMA completion callback function pointer type.
This callback is used only for the non-blocking master transfer API. Specify the callback you wish to use in the call to LPI2C_MasterCreateEDMAHandle().
| base | The LPI2C peripheral base address. |
| handle | Handle associated with the completed transfer. |
| completionStatus | Either kStatus_Success or an error code describing how the transfer completed. |
| userData | Arbitrary pointer-sized value passed from the application. |
| void LPI2C_MasterCreateEDMAHandle | ( | LPI2C_Type * | base, |
| lpi2c_master_edma_handle_t * | handle, | ||
| edma_handle_t * | rxDmaHandle, | ||
| edma_handle_t * | txDmaHandle, | ||
| lpi2c_master_edma_transfer_callback_t | callback, | ||
| void * | userData | ||
| ) |
Create a new handle for the LPI2C master DMA APIs.
The creation of a handle is for use with the DMA APIs. Once a handle is created, there is not a corresponding destroy handle. If the user wants to terminate a transfer, the LPI2C_MasterTransferAbortEDMA() API shall be called.
For devices where the LPI2C send and receive DMA requests are OR'd together, the txDmaHandle parameter is ignored and may be set to NULL.
| base | The LPI2C peripheral base address. | |
| [out] | handle | Pointer to the LPI2C master driver handle. |
| rxDmaHandle | Handle for the eDMA receive channel. Created by the user prior to calling this function. | |
| txDmaHandle | Handle for the eDMA transmit channel. Created by the user prior to calling this function. | |
| callback | User provided pointer to the asynchronous callback function. | |
| userData | User provided pointer to the application callback data. |
brief Create a new handle for the LPI2C master DMA APIs.
The creation of a handle is for use with the DMA APIs. Once a handle is created, there is not a corresponding destroy handle. If the user wants to terminate a transfer, the LPI2C_MasterTransferAbortEDMA() API shall be called.
For devices where the LPI2C send and receive DMA requests are OR'd together, the a txDmaHandle parameter is ignored and may be set to NULL.
param base The LPI2C peripheral base address. param[out] handle Pointer to the LPI2C master driver handle. param rxDmaHandle Handle for the eDMA receive channel. Created by the user prior to calling this function. param txDmaHandle Handle for the eDMA transmit channel. Created by the user prior to calling this function. param callback User provided pointer to the asynchronous callback function. param userData User provided pointer to the application callback data.
| status_t LPI2C_MasterTransferAbortEDMA | ( | LPI2C_Type * | base, |
| lpi2c_master_edma_handle_t * | handle | ||
| ) |
Terminates a non-blocking LPI2C master transmission early.
| base | The LPI2C peripheral base address. |
| handle | Pointer to the LPI2C master driver handle. |
| kStatus_Success | A transaction was successfully aborted. |
| kStatus_LPI2C_Idle | There is not a DMA transaction currently in progress. |
brief Terminates a non-blocking LPI2C master transmission early.
note It is not safe to call this function from an IRQ handler that has a higher priority than the eDMA peripheral's IRQ priority.
param base The LPI2C peripheral base address. param handle Pointer to the LPI2C master driver handle. retval kStatus_Success A transaction was successfully aborted. retval kStatus_LPI2C_Idle There is not a DMA transaction currently in progress.
| status_t LPI2C_MasterTransferEDMA | ( | LPI2C_Type * | base, |
| lpi2c_master_edma_handle_t * | handle, | ||
| lpi2c_master_transfer_t * | transfer | ||
| ) |
Performs a non-blocking DMA-based transaction on the I2C bus.
The callback specified when the handle was created is invoked when the transaction has completed.
| base | The LPI2C peripheral base address. |
| handle | Pointer to the LPI2C master driver handle. |
| transfer | The pointer to the transfer descriptor. |
| kStatus_Success | The transaction was started successfully. |
| kStatus_LPI2C_Busy | Either another master is currently utilizing the bus, or another DMA transaction is already in progress. |
brief Performs a non-blocking DMA-based transaction on the I2C bus.
The callback specified when the a handle was created is invoked when the transaction has completed.
param base The LPI2C peripheral base address. param handle Pointer to the LPI2C master driver handle. param transfer The pointer to the transfer descriptor. retval kStatus_Success The transaction was started successfully. retval kStatus_LPI2C_Busy Either another master is currently utilizing the bus, or another DMA transaction is already in progress.
| status_t LPI2C_MasterTransferGetCountEDMA | ( | LPI2C_Type * | base, |
| lpi2c_master_edma_handle_t * | handle, | ||
| size_t * | count | ||
| ) |
Returns number of bytes transferred so far.
| base | The LPI2C peripheral base address. | |
| handle | Pointer to the LPI2C master driver handle. | |
| [out] | count | Number of bytes transferred so far by the non-blocking transaction. |
| kStatus_Success | |
| kStatus_NoTransferInProgress | There is not a DMA transaction currently in progress. |
brief Returns number of bytes transferred so far.
param base The LPI2C peripheral base address. param handle Pointer to the LPI2C master driver handle. param[out] count Number of bytes transferred so far by the non-blocking transaction. retval kStatus_Success retval kStatus_NoTransferInProgress There is not a DMA transaction currently in progress.
| LPI2C_Type* _lpi2c_master_edma_handle::base |
LPI2C base pointer.
| uint16_t _lpi2c_master_edma_handle::commandBuffer[10] |
LPI2C command sequence. When all 10 command words are used: Start&addr&write[1 word] + subaddr[4 words] + restart&addr&read[1 word] + receive&Size[4 words]
| lpi2c_master_edma_transfer_callback_t _lpi2c_master_edma_handle::completionCallback |
Callback function pointer.
| bool _lpi2c_master_edma_handle::isBusy |
Transfer state machine current state.
| uint8_t _lpi2c_master_edma_handle::nbytes |
eDMA minor byte transfer count initially configured.
| edma_handle_t* _lpi2c_master_edma_handle::rx |
Handle for receive DMA channel.
| edma_tcd_t _lpi2c_master_edma_handle::tcds[3] |
Software TCD. Three are allocated to provide enough room to align to 32-bytes.
| lpi2c_master_transfer_t _lpi2c_master_edma_handle::transfer |
Copy of the current transfer info.
| edma_handle_t* _lpi2c_master_edma_handle::tx |
Handle for transmit DMA channel.
| void* _lpi2c_master_edma_handle::userData |
Application data passed to callback.
1.9.6