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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* Copyright 2016-2017 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "fsl_lpspi_freertos.h"
/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.lpspi_freertos"
#endif
static void LPSPI_RTOS_Callback(LPSPI_Type *base, lpspi_master_handle_t *drv_handle, status_t status, void *userData)
{
lpspi_rtos_handle_t *handle = (lpspi_rtos_handle_t *)userData;
BaseType_t reschedule;
handle->async_status = status;
(void)xSemaphoreGiveFromISR(handle->event, &reschedule);
portYIELD_FROM_ISR(reschedule);
}
/*!
* brief Initializes LPSPI.
*
* This function initializes the LPSPI module and related RTOS context.
*
* param handle The RTOS LPSPI handle, the pointer to an allocated space for RTOS context.
* param base The pointer base address of the LPSPI instance to initialize.
* param masterConfig Configuration structure to set-up LPSPI in master mode.
* param srcClock_Hz Frequency of input clock of the LPSPI module.
* return status of the operation.
*/
status_t LPSPI_RTOS_Init(lpspi_rtos_handle_t *handle,
LPSPI_Type *base,
const lpspi_master_config_t *masterConfig,
uint32_t srcClock_Hz)
{
if (handle == NULL)
{
return kStatus_InvalidArgument;
}
if (base == NULL)
{
return kStatus_InvalidArgument;
}
(void)memset(handle, 0, sizeof(lpspi_rtos_handle_t));
handle->mutex = xSemaphoreCreateMutex();
if (handle->mutex == NULL)
{
return kStatus_Fail;
}
handle->event = xSemaphoreCreateBinary();
if (handle->event == NULL)
{
vSemaphoreDelete(handle->mutex);
return kStatus_Fail;
}
handle->base = base;
LPSPI_MasterInit(handle->base, masterConfig, srcClock_Hz);
LPSPI_MasterTransferCreateHandle(handle->base, &handle->drv_handle, LPSPI_RTOS_Callback, (void *)handle);
return kStatus_Success;
}
/*!
* brief Deinitializes the LPSPI.
*
* This function deinitializes the LPSPI module and related RTOS context.
*
* param handle The RTOS LPSPI handle.
*/
status_t LPSPI_RTOS_Deinit(lpspi_rtos_handle_t *handle)
{
LPSPI_Deinit(handle->base);
vSemaphoreDelete(handle->event);
vSemaphoreDelete(handle->mutex);
return kStatus_Success;
}
/*!
* brief Performs SPI transfer.
*
* This function performs an SPI transfer according to data given in the transfer structure.
*
* param handle The RTOS LPSPI handle.
* param transfer Structure specifying the transfer parameters.
* return status of the operation.
*/
status_t LPSPI_RTOS_Transfer(lpspi_rtos_handle_t *handle, lpspi_transfer_t *transfer)
{
status_t status;
/* Lock resource mutex */
if (xSemaphoreTake(handle->mutex, portMAX_DELAY) != pdTRUE)
{
return kStatus_LPSPI_Busy;
}
status = LPSPI_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
if (status != kStatus_Success)
{
(void)xSemaphoreGive(handle->mutex);
return status;
}
/* Wait for transfer to finish */
if (xSemaphoreTake(handle->event, portMAX_DELAY) != pdTRUE)
{
return kStatus_LPSPI_Error;
}
/* Unlock resource mutex */
(void)xSemaphoreGive(handle->mutex);
/* Return status captured by callback function */
return handle->async_status;
}
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