126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2019 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_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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handle->async_status = status;
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(void)xSemaphoreGiveFromISR(handle->semaphore, &reschedule);
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portYIELD_FROM_ISR(reschedule);
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}
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/*!
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* brief Initializes LPI2C.
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*
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* This function initializes the LPI2C module and related RTOS context.
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*
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* param handle The RTOS LPI2C handle, the pointer to an allocated space for RTOS context.
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* param base The pointer base address of the LPI2C instance to initialize.
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* param masterConfig Configuration structure to set-up LPI2C in master mode.
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* param srcClock_Hz Frequency of input clock of the LPI2C module.
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* return status of the operation.
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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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(void)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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/*!
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* brief Deinitializes the LPI2C.
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*
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* This function deinitializes the LPI2C module and related RTOS context.
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*
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* param handle The RTOS LPI2C handle.
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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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/*!
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* brief Performs I2C transfer.
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*
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* This function performs an I2C transfer using LPI2C module according to data given in the transfer structure.
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*
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* param handle The RTOS LPI2C 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 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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(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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(void)xSemaphoreTake(handle->semaphore, portMAX_DELAY);
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/* Unlock resource mutex */
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(void)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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