287 lines
9.2 KiB
C
287 lines
9.2 KiB
C
//*****************************************************************************
|
|
//
|
|
// am_hal_queue.c
|
|
//! @file
|
|
//!
|
|
//! @brief Functions for implementing a queue system.
|
|
//!
|
|
//! @addtogroup Miscellaneous2 Software Features (MISC)
|
|
//! @ingroup apollo2hal
|
|
//! @{
|
|
//
|
|
//*****************************************************************************
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Copyright (c) 2017, Ambiq Micro
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice,
|
|
// this list of conditions and the following disclaimer.
|
|
//
|
|
// 2. Redistributions in binary form must reproduce the above copyright
|
|
// notice, this list of conditions and the following disclaimer in the
|
|
// documentation and/or other materials provided with the distribution.
|
|
//
|
|
// 3. Neither the name of the copyright holder nor the names of its
|
|
// contributors may be used to endorse or promote products derived from this
|
|
// software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
// POSSIBILITY OF SUCH DAMAGE.
|
|
//
|
|
// This is part of revision 1.2.11 of the AmbiqSuite Development Package.
|
|
//
|
|
//*****************************************************************************
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include "am_mcu_apollo.h"
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Initializes a queue.
|
|
//!
|
|
//! @param psQueue - Pointer to a queue structure.
|
|
//! @param pvData - Pointer to a memory location to be used for data storage.
|
|
//! @param ui32ItemSize - Number of bytes per item in the queue.
|
|
//! @param ui32ArraySize - Number of bytes in the data array.
|
|
//!
|
|
//! This function initializes the members of a queue structure and attaches it
|
|
//! to an array of memory that it can use for storage. This function should be
|
|
//! called before the queue is used.
|
|
//!
|
|
//! In this example, we are creating a queue that can hold 1024 32-bit
|
|
//! integers. The integers themselves will be stored in the array named
|
|
//! pui32WorkingSpace, while information about the queue itself will be stored
|
|
//! in sDataQueue.
|
|
//!
|
|
//! @note The caller should not modify any of the members of am_hal_queue_t
|
|
//! structures. The queue API will handle these members in a thread-safe way.
|
|
//!
|
|
//! @note The queue will remember what size data is in it. Other queue API
|
|
//! functions will perform transfers in units of "items" where one "item" is
|
|
//! the number of bytes you specify in the \e ui32ItemSize argument upon
|
|
//! initialization.
|
|
//!
|
|
//! Example usage:
|
|
//!
|
|
//! @code
|
|
//!
|
|
//! //
|
|
//! // Declare a queue structure and an array of bytes we can use to store
|
|
//! // data.
|
|
//! //
|
|
//! am_hal_queue_t sDataQueue;
|
|
//! uint32_t pui32WorkingSpace[1024];
|
|
//!
|
|
//! //
|
|
//! // Attach the queue structure to the working memory.
|
|
//! //
|
|
//! am_hal_queue_init(&sDataQueue, pui8WorkingSpace, sizeof(uint32_t)
|
|
//! sizeof(pui32WorkingSpace));
|
|
//!
|
|
//! @endcode
|
|
//!
|
|
//! The am_hal_queue_from_array macro is a convenient shorthand for this
|
|
//! operation. The code below does the same thing as the code above.
|
|
//!
|
|
//! @code
|
|
//!
|
|
//! //
|
|
//! // Declare a queue structure and an array of bytes we can use to store
|
|
//! // data.
|
|
//! //
|
|
//! am_hal_queue_t sDataQueue;
|
|
//! uint32_t pui32WorkingSpace[1024];
|
|
//!
|
|
//! //
|
|
//! // Attach the queue structure to the working memory.
|
|
//! //
|
|
//! am_hal_queue_from_array(&sDataQueue, pui8WorkingSpace);
|
|
//!
|
|
//! @endcode
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_queue_init(am_hal_queue_t *psQueue, void *pvData, uint32_t ui32ItemSize,
|
|
uint32_t ui32ArraySize)
|
|
{
|
|
psQueue->ui32WriteIndex = 0;
|
|
psQueue->ui32ReadIndex = 0;
|
|
psQueue->ui32Length = 0;
|
|
psQueue->ui32Capacity = ui32ArraySize;
|
|
psQueue->ui32ItemSize = ui32ItemSize;
|
|
psQueue->pui8Data = (uint8_t *) pvData;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Adds an item to the Queue
|
|
//!
|
|
//! @param psQueue - Pointer to a queue structure.
|
|
//! @param pvSource - Pointer to the data to be added.
|
|
//! @param ui32NumItems - Number of items to be added.
|
|
//!
|
|
//! This function will copy the data pointed to by pvSource into the queue. The
|
|
//! \e ui32NumItems term specifies the number of items to be copied from \e
|
|
//! pvSource. The size of an "item" depends on how the queue was initialized.
|
|
//! Please see am_hal_queue_init() for more information on this.
|
|
//!
|
|
//! @return true if the add operation was successful, or false if the queue
|
|
//! didn't have enough space.
|
|
//
|
|
//*****************************************************************************
|
|
bool
|
|
am_hal_queue_item_add(am_hal_queue_t *psQueue, const void *pvSource, uint32_t ui32NumItems)
|
|
{
|
|
uint32_t i;
|
|
uint8_t *pui8Source;
|
|
uint32_t ui32Bytes = ui32NumItems * psQueue->ui32ItemSize;
|
|
bool bSuccess = false;
|
|
uint32_t ui32Primask;
|
|
|
|
pui8Source = (uint8_t *) pvSource;
|
|
|
|
ui32Primask = am_hal_interrupt_master_disable();
|
|
|
|
//
|
|
// Check to make sure that the buffer isn't already full
|
|
//
|
|
if ( am_hal_queue_space_left(psQueue) >= ui32Bytes )
|
|
{
|
|
//
|
|
// Loop over the bytes in the source array.
|
|
//
|
|
for ( i = 0; i < ui32Bytes; i++ )
|
|
{
|
|
//
|
|
// Write the value to the buffer.
|
|
//
|
|
psQueue->pui8Data[psQueue->ui32WriteIndex] = pui8Source[i];
|
|
|
|
//
|
|
// Advance the write index, making sure to wrap if necessary.
|
|
//
|
|
psQueue->ui32WriteIndex = ((psQueue->ui32WriteIndex + 1) %
|
|
psQueue->ui32Capacity);
|
|
}
|
|
|
|
//
|
|
// Update the length value appropriately.
|
|
//
|
|
psQueue->ui32Length += ui32Bytes;
|
|
|
|
//
|
|
// Report a success.
|
|
//
|
|
bSuccess = true;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// The buffer can't fit the amount of data requested. Return a
|
|
// failure.
|
|
//
|
|
bSuccess = false;
|
|
}
|
|
|
|
am_hal_interrupt_master_set(ui32Primask);
|
|
|
|
return bSuccess;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Removes an item from the Queue
|
|
//!
|
|
//! @param psQueue - Pointer to a queue structure.
|
|
//! @param pvDest - Pointer to the data to be added.
|
|
//! @param ui32NumItems - Number of items to be added.
|
|
//!
|
|
//! This function will copy the data from the queue into the memory pointed to
|
|
//! by pvDest. The \e ui32NumItems term specifies the number of items to be
|
|
//! copied from the queue. The size of an "item" depends on how the queue was
|
|
//! initialized. Please see am_hal_queue_init() for more information on this.
|
|
//!
|
|
//! @return true if we were able to pull the requested number of items from the
|
|
//! queue, or false if the queue didn't have that many items to pull.
|
|
//
|
|
//*****************************************************************************
|
|
bool
|
|
am_hal_queue_item_get(am_hal_queue_t *psQueue, void *pvDest, uint32_t ui32NumItems)
|
|
{
|
|
uint32_t i;
|
|
uint8_t *pui8Dest;
|
|
uint32_t ui32Bytes = ui32NumItems * psQueue->ui32ItemSize;
|
|
bool bSuccess = false;
|
|
uint32_t ui32Primask;
|
|
|
|
pui8Dest = (uint8_t *) pvDest;
|
|
|
|
ui32Primask = am_hal_interrupt_master_disable();
|
|
|
|
//
|
|
// Check to make sure that the buffer isn't empty
|
|
//
|
|
if ( am_hal_queue_data_left(psQueue) >= ui32Bytes )
|
|
{
|
|
//
|
|
// Loop over the bytes in the destination array.
|
|
//
|
|
for ( i = 0; i < ui32Bytes; i++ )
|
|
{
|
|
//
|
|
// Grab the next value from the buffer.
|
|
//
|
|
pui8Dest[i] = psQueue->pui8Data[psQueue->ui32ReadIndex];
|
|
|
|
//
|
|
// Advance the read index, wrapping if needed.
|
|
//
|
|
psQueue->ui32ReadIndex = ((psQueue->ui32ReadIndex + 1) %
|
|
psQueue->ui32Capacity);
|
|
}
|
|
|
|
//
|
|
// Adjust the length value to reflect the change.
|
|
//
|
|
psQueue->ui32Length -= ui32Bytes;
|
|
|
|
//
|
|
// Report a success.
|
|
//
|
|
bSuccess = true;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// If the buffer didn't have enough data, just return false.
|
|
//
|
|
bSuccess = false;
|
|
}
|
|
|
|
am_hal_interrupt_master_set(ui32Primask);
|
|
|
|
return bSuccess;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// End Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|