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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* Copyright 2016-2019 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "fsl_lpi2c_freertos.h"
/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.lpi2c_freertos"
#endif
static void LPI2C_RTOS_Callback(LPI2C_Type *base, lpi2c_master_handle_t *drv_handle, status_t status, void *userData)
{
lpi2c_rtos_handle_t *handle = (lpi2c_rtos_handle_t *)userData;
BaseType_t reschedule;
handle->async_status = status;
(void)xSemaphoreGiveFromISR(handle->semaphore, &reschedule);
portYIELD_FROM_ISR(reschedule);
}
/*!
* brief Initializes LPI2C.
*
* This function initializes the LPI2C module and related RTOS context.
*
* param handle The RTOS LPI2C handle, the pointer to an allocated space for RTOS context.
* param base The pointer base address of the LPI2C instance to initialize.
* param masterConfig Configuration structure to set-up LPI2C in master mode.
* param srcClock_Hz Frequency of input clock of the LPI2C module.
* return status of the operation.
*/
status_t LPI2C_RTOS_Init(lpi2c_rtos_handle_t *handle,
LPI2C_Type *base,
const lpi2c_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(lpi2c_rtos_handle_t));
handle->mutex = xSemaphoreCreateMutex();
if (handle->mutex == NULL)
{
return kStatus_Fail;
}
handle->semaphore = xSemaphoreCreateBinary();
if (handle->semaphore == NULL)
{
vSemaphoreDelete(handle->mutex);
return kStatus_Fail;
}
handle->base = base;
LPI2C_MasterInit(handle->base, masterConfig, srcClock_Hz);
LPI2C_MasterTransferCreateHandle(base, &handle->drv_handle, LPI2C_RTOS_Callback, (void *)handle);
return kStatus_Success;
}
/*!
* brief Deinitializes the LPI2C.
*
* This function deinitializes the LPI2C module and related RTOS context.
*
* param handle The RTOS LPI2C handle.
*/
status_t LPI2C_RTOS_Deinit(lpi2c_rtos_handle_t *handle)
{
LPI2C_MasterDeinit(handle->base);
vSemaphoreDelete(handle->semaphore);
vSemaphoreDelete(handle->mutex);
return kStatus_Success;
}
/*!
* brief Performs I2C transfer.
*
* This function performs an I2C transfer using LPI2C module according to data given in the transfer structure.
*
* param handle The RTOS LPI2C handle.
* param transfer Structure specifying the transfer parameters.
* return status of the operation.
*/
status_t LPI2C_RTOS_Transfer(lpi2c_rtos_handle_t *handle, lpi2c_master_transfer_t *transfer)
{
status_t status;
/* Lock resource mutex */
if (xSemaphoreTake(handle->mutex, portMAX_DELAY) != pdTRUE)
{
return kStatus_LPI2C_Busy;
}
status = LPI2C_MasterTransferNonBlocking(handle->base, &handle->drv_handle, transfer);
if (status != kStatus_Success)
{
(void)xSemaphoreGive(handle->mutex);
return status;
}
/* Wait for transfer to finish */
(void)xSemaphoreTake(handle->semaphore, portMAX_DELAY);
/* Unlock resource mutex */
(void)xSemaphoreGive(handle->mutex);
/* Return status captured by callback function */
return handle->async_status;
}
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