126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
/*
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* The Clear BSD License
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted (subject to the limitations in the disclaimer below) provided
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* that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "fsl_lpi2c_freertos.h"
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/* Component ID definition, used by tools. */
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#ifndef FSL_COMPONENT_ID
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#define FSL_COMPONENT_ID "platform.drivers.lpi2c_freertos"
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#endif
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static void LPI2C_RTOS_Callback(LPI2C_Type *base, lpi2c_master_handle_t *drv_handle, status_t status, void *userData)
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{
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lpi2c_rtos_handle_t *handle = (lpi2c_rtos_handle_t *)userData;
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BaseType_t reschedule;
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xSemaphoreGiveFromISR(handle->semaphore, &reschedule);
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portYIELD_FROM_ISR(reschedule);
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}
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status_t LPI2C_RTOS_Init(lpi2c_rtos_handle_t *handle,
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LPI2C_Type *base,
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const lpi2c_master_config_t *masterConfig,
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uint32_t srcClock_Hz)
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{
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if (handle == NULL)
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{
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return kStatus_InvalidArgument;
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}
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if (base == NULL)
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{
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return kStatus_InvalidArgument;
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}
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memset(handle, 0, sizeof(lpi2c_rtos_handle_t));
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handle->mutex = xSemaphoreCreateMutex();
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if (handle->mutex == NULL)
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{
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return kStatus_Fail;
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}
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handle->semaphore = xSemaphoreCreateBinary();
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if (handle->semaphore == NULL)
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{
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vSemaphoreDelete(handle->mutex);
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return kStatus_Fail;
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}
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handle->base = base;
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LPI2C_MasterInit(handle->base, masterConfig, srcClock_Hz);
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LPI2C_MasterTransferCreateHandle(base, &handle->drv_handle, LPI2C_RTOS_Callback, (void *)handle);
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return kStatus_Success;
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}
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status_t LPI2C_RTOS_Deinit(lpi2c_rtos_handle_t *handle)
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{
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LPI2C_MasterDeinit(handle->base);
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vSemaphoreDelete(handle->semaphore);
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vSemaphoreDelete(handle->mutex);
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return kStatus_Success;
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}
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status_t LPI2C_RTOS_Transfer(lpi2c_rtos_handle_t *handle, lpi2c_master_transfer_t *transfer)
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{
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status_t status;
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/* Lock resource mutex */
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if (xSemaphoreTake(handle->mutex, portMAX_DELAY) != pdTRUE)
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{
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return kStatus_LPI2C_Busy;
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}
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status = LPI2C_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
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if (status != kStatus_Success)
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{
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xSemaphoreGive(handle->mutex);
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return status;
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}
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/* Wait for transfer to finish */
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xSemaphoreTake(handle->semaphore, portMAX_DELAY);
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/* Unlock resource mutex */
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xSemaphoreGive(handle->mutex);
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/* Return status captured by callback function */
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return handle->async_status;
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}
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