139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
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* Copyright (c) 2016, 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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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "fsl_spi_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.flexcomm_spi_freertos"
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#endif
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static void SPI_RTOS_Callback(SPI_Type *base, spi_master_handle_t *drv_handle, status_t status, void *userData)
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{
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spi_rtos_handle_t *handle = (spi_rtos_handle_t *)userData;
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BaseType_t reschedule = pdFALSE;
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handle->async_status = status;
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(void)xSemaphoreGiveFromISR(handle->event, &reschedule);
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portYIELD_FROM_ISR(reschedule);
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}
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/*!
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* brief Initializes SPI.
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*
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* This function initializes the SPI module and related RTOS context.
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*
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* param handle The RTOS SPI handle, the pointer to an allocated space for RTOS context.
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* param base The pointer base address of the SPI instance to initialize.
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* param masterConfig Configuration structure to set-up SPI in master mode.
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* param srcClock_Hz Frequency of input clock of the SPI module.
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* return status of the operation.
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*/
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status_t SPI_RTOS_Init(spi_rtos_handle_t *handle,
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SPI_Type *base,
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const spi_master_config_t *masterConfig,
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uint32_t srcClock_Hz)
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{
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status_t status;
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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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(void)memset(handle, 0, sizeof(spi_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->event = xSemaphoreCreateBinary();
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if (handle->event == 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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(void)SPI_MasterInit(handle->base, masterConfig, srcClock_Hz);
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status = SPI_MasterTransferCreateHandle(handle->base, &handle->drv_handle, SPI_RTOS_Callback, (void *)handle);
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return status;
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}
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/*!
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* brief Deinitializes the SPI.
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*
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* This function deinitializes the SPI module and related RTOS context.
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*
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* param handle The RTOS SPI handle.
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*/
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status_t SPI_RTOS_Deinit(spi_rtos_handle_t *handle)
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{
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SPI_Deinit(handle->base);
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vSemaphoreDelete(handle->event);
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vSemaphoreDelete(handle->mutex);
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return kStatus_Success;
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}
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/*!
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* brief Performs SPI transfer.
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*
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* This function performs an SPI transfer according to data given in the transfer structure.
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*
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* param handle The RTOS SPI handle.
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* param transfer Structure specifying the transfer parameters.
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* return status of the operation.
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*/
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status_t SPI_RTOS_Transfer(spi_rtos_handle_t *handle, spi_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_SPI_Busy;
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}
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/* Initiate transfer */
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status = SPI_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
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if (status != kStatus_Success)
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{
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(void)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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if (xSemaphoreTake(handle->event, portMAX_DELAY) != pdTRUE)
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{
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return kStatus_SPI_Error;
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}
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/* Retrieve status before releasing mutex */
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status = handle->async_status;
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/* Unlock resource mutex */
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(void)xSemaphoreGive(handle->mutex);
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/* Translate status of underlying driver */
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if (status == kStatus_SPI_Idle)
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{
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status = kStatus_Success;
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}
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return status;
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}
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