387 lines
12 KiB
C
387 lines
12 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_lpuart_freertos.h"
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#include <FreeRTOS.h>
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#include <event_groups.h>
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#include <semphr.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.lpuart_freertos"
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#endif
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static void LPUART_RTOS_Callback(LPUART_Type *base, lpuart_handle_t *state, status_t status, void *param)
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{
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lpuart_rtos_handle_t *handle = (lpuart_rtos_handle_t *)param;
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BaseType_t xHigherPriorityTaskWoken, xResult;
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xHigherPriorityTaskWoken = pdFALSE;
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xResult = pdFAIL;
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if (status == kStatus_LPUART_RxIdle)
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{
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xResult = xEventGroupSetBitsFromISR(handle->rxEvent, RTOS_LPUART_COMPLETE, &xHigherPriorityTaskWoken);
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}
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else if (status == kStatus_LPUART_TxIdle)
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{
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xResult = xEventGroupSetBitsFromISR(handle->txEvent, RTOS_LPUART_COMPLETE, &xHigherPriorityTaskWoken);
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}
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else if (status == kStatus_LPUART_RxRingBufferOverrun)
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{
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xResult =
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xEventGroupSetBitsFromISR(handle->rxEvent, RTOS_LPUART_RING_BUFFER_OVERRUN, &xHigherPriorityTaskWoken);
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}
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else if (status == kStatus_LPUART_RxHardwareOverrun)
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{
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/* Clear Overrun flag (OR) in LPUART STAT register */
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(void)LPUART_ClearStatusFlags(base, (uint32_t)kLPUART_RxOverrunFlag);
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xResult =
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xEventGroupSetBitsFromISR(handle->rxEvent, RTOS_LPUART_HARDWARE_BUFFER_OVERRUN, &xHigherPriorityTaskWoken);
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}
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else
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{
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xResult = pdFAIL;
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}
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if (xResult != pdFAIL)
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{
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portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
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}
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : LPUART_RTOS_Init
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* Description : Initializes the LPUART instance for application
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*
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*END**************************************************************************/
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/*!
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* brief Initializes an LPUART instance for operation in RTOS.
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*
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* param handle The RTOS LPUART handle, the pointer to an allocated space for RTOS context.
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* param t_handle The pointer to an allocated space to store the transactional layer internal state.
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* param cfg The pointer to the parameters required to configure the LPUART after initialization.
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* return kStatus_Success, others failed
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*/
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int LPUART_RTOS_Init(lpuart_rtos_handle_t *handle, lpuart_handle_t *t_handle, const lpuart_rtos_config_t *cfg)
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{
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status_t status;
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lpuart_config_t defcfg;
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if (NULL == handle)
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{
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return kStatus_InvalidArgument;
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}
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if (NULL == t_handle)
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{
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return kStatus_InvalidArgument;
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}
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if (NULL == cfg)
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{
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return kStatus_InvalidArgument;
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}
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if (NULL == cfg->base)
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{
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return kStatus_InvalidArgument;
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}
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if (0u == cfg->srcclk)
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{
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return kStatus_InvalidArgument;
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}
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if (0u == cfg->baudrate)
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{
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return kStatus_InvalidArgument;
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}
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handle->base = cfg->base;
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handle->t_state = t_handle;
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#if (configSUPPORT_STATIC_ALLOCATION == 1)
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handle->txSemaphore = xSemaphoreCreateMutexStatic(&handle->txSemaphoreBuffer);
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#else
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handle->txSemaphore = xSemaphoreCreateMutex();
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#endif
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if (NULL == handle->txSemaphore)
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{
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return kStatus_Fail;
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}
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#if (configSUPPORT_STATIC_ALLOCATION == 1)
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handle->rxSemaphore = xSemaphoreCreateMutexStatic(&handle->rxSemaphoreBuffer);
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#else
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handle->rxSemaphore = xSemaphoreCreateMutex();
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#endif
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if (NULL == handle->rxSemaphore)
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{
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vSemaphoreDelete(handle->txSemaphore);
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return kStatus_Fail;
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}
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#if (configSUPPORT_STATIC_ALLOCATION == 1)
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handle->txEvent = xEventGroupCreateStatic(&handle->txEventBuffer);
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#else
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handle->txEvent = xEventGroupCreate();
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#endif
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if (NULL == handle->txEvent)
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{
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vSemaphoreDelete(handle->rxSemaphore);
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vSemaphoreDelete(handle->txSemaphore);
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return kStatus_Fail;
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}
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#if (configSUPPORT_STATIC_ALLOCATION == 1)
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handle->rxEvent = xEventGroupCreateStatic(&handle->rxEventBuffer);
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#else
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handle->rxEvent = xEventGroupCreate();
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#endif
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if (NULL == handle->rxEvent)
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{
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vEventGroupDelete(handle->txEvent);
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vSemaphoreDelete(handle->rxSemaphore);
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vSemaphoreDelete(handle->txSemaphore);
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return kStatus_Fail;
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}
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LPUART_GetDefaultConfig(&defcfg);
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defcfg.baudRate_Bps = cfg->baudrate;
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defcfg.parityMode = cfg->parity;
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defcfg.stopBitCount = cfg->stopbits;
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#if defined(FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT) && FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT
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defcfg.enableRxRTS = cfg->enableRxRTS;
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defcfg.enableTxCTS = cfg->enableTxCTS;
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defcfg.txCtsSource = cfg->txCtsSource;
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defcfg.txCtsConfig = cfg->txCtsConfig;
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#endif
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status = LPUART_Init(handle->base, &defcfg, cfg->srcclk);
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if (status != kStatus_Success)
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{
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vEventGroupDelete(handle->rxEvent);
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vEventGroupDelete(handle->txEvent);
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vSemaphoreDelete(handle->rxSemaphore);
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vSemaphoreDelete(handle->txSemaphore);
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return kStatus_Fail;
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}
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LPUART_TransferCreateHandle(handle->base, handle->t_state, LPUART_RTOS_Callback, handle);
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LPUART_TransferStartRingBuffer(handle->base, handle->t_state, cfg->buffer, cfg->buffer_size);
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LPUART_EnableTx(handle->base, true);
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LPUART_EnableRx(handle->base, true);
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return kStatus_Success;
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : LPUART_RTOS_Deinit
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* Description : Deinitializes the LPUART instance and frees resources
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*
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*END**************************************************************************/
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/*!
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* brief Deinitializes an LPUART instance for operation.
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*
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* This function deinitializes the LPUART module, sets all register value to the reset value,
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* and releases the resources.
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*
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* param handle The RTOS LPUART handle.
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*/
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int LPUART_RTOS_Deinit(lpuart_rtos_handle_t *handle)
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{
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LPUART_Deinit(handle->base);
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vEventGroupDelete(handle->txEvent);
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vEventGroupDelete(handle->rxEvent);
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/* Give the semaphore. This is for functional safety */
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(void)xSemaphoreGive(handle->txSemaphore);
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(void)xSemaphoreGive(handle->rxSemaphore);
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vSemaphoreDelete(handle->txSemaphore);
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vSemaphoreDelete(handle->rxSemaphore);
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/* Invalidate the handle */
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handle->base = NULL;
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handle->t_state = NULL;
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return 0;
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : UART_RTOS_Send
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* Description : Initializes the UART instance for application
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*
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*END**************************************************************************/
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/*!
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* brief Sends data in the background.
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*
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* This function sends data. It is an synchronous API.
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* If the hardware buffer is full, the task is in the blocked state.
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*
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* param handle The RTOS LPUART handle.
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* param buffer The pointer to buffer to send.
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* param length The number of bytes to send.
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*/
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int LPUART_RTOS_Send(lpuart_rtos_handle_t *handle, uint8_t *buffer, uint32_t length)
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{
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EventBits_t ev;
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int retval = kStatus_Success;
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status_t status;
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if (NULL == handle->base)
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{
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/* Invalid handle. */
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return kStatus_Fail;
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}
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if (0u == length)
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{
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return kStatus_Success;
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}
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if (NULL == buffer)
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{
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return kStatus_InvalidArgument;
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}
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if (pdFALSE == xSemaphoreTake(handle->txSemaphore, 0))
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{
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/* We could not take the semaphore, exit with 0 data received */
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return kStatus_Fail;
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}
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handle->txTransfer.data = (uint8_t *)buffer;
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handle->txTransfer.dataSize = (uint32_t)length;
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/* Non-blocking call */
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status = LPUART_TransferSendNonBlocking(handle->base, handle->t_state, &handle->txTransfer);
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if (status != kStatus_Success)
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{
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(void)xSemaphoreGive(handle->txSemaphore);
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return kStatus_Fail;
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}
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ev = xEventGroupWaitBits(handle->txEvent, RTOS_LPUART_COMPLETE, pdTRUE, pdFALSE, portMAX_DELAY);
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if ((ev & RTOS_LPUART_COMPLETE) == 0U)
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{
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retval = kStatus_Fail;
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}
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if (pdFALSE == xSemaphoreGive(handle->txSemaphore))
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{
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/* We could not post the semaphore, exit with error */
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retval = kStatus_Fail;
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}
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return retval;
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : LPUART_RTOS_Recv
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* Description : Receives chars for the application
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*
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*END**************************************************************************/
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/*!
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* brief Receives data.
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*
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* This function receives data from LPUART. It is an synchronous API. If any data is immediately available
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* it is returned immediately and the number of bytes received.
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*
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* param handle The RTOS LPUART handle.
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* param buffer The pointer to buffer where to write received data.
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* param length The number of bytes to receive.
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* param received The pointer to a variable of size_t where the number of received data is filled.
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*/
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int LPUART_RTOS_Receive(lpuart_rtos_handle_t *handle, uint8_t *buffer, uint32_t length, size_t *received)
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{
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EventBits_t ev;
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size_t n = 0;
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int retval = kStatus_Fail;
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size_t local_received = 0;
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status_t status;
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if (NULL == handle->base)
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{
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/* Invalid handle. */
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return kStatus_Fail;
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}
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if (0u == length)
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{
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if (received != NULL)
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{
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*received = n;
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}
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return kStatus_Success;
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}
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if (NULL == buffer)
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{
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return kStatus_InvalidArgument;
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}
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/* New transfer can be performed only after current one is finished */
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if (pdFALSE == xSemaphoreTake(handle->rxSemaphore, portMAX_DELAY))
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{
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/* We could not take the semaphore, exit with 0 data received */
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return kStatus_Fail;
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}
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handle->rxTransfer.data = buffer;
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handle->rxTransfer.dataSize = (uint32_t)length;
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/* Non-blocking call */
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status = LPUART_TransferReceiveNonBlocking(handle->base, handle->t_state, &handle->rxTransfer, &n);
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if (status != kStatus_Success)
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{
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(void)xSemaphoreGive(handle->rxSemaphore);
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return kStatus_Fail;
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}
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ev = xEventGroupWaitBits(
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handle->rxEvent, RTOS_LPUART_COMPLETE | RTOS_LPUART_RING_BUFFER_OVERRUN | RTOS_LPUART_HARDWARE_BUFFER_OVERRUN,
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pdTRUE, pdFALSE, portMAX_DELAY);
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if ((ev & RTOS_LPUART_HARDWARE_BUFFER_OVERRUN) != 0U)
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{
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/* Stop data transfer to application buffer, ring buffer is still active */
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LPUART_TransferAbortReceive(handle->base, handle->t_state);
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/* Prevent false indication of successful transfer in next call of LPUART_RTOS_Receive.
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RTOS_LPUART_COMPLETE flag could be set meanwhile overrun is handled */
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(void)xEventGroupClearBits(handle->rxEvent, RTOS_LPUART_COMPLETE);
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retval = kStatus_LPUART_RxHardwareOverrun;
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local_received = 0;
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}
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else if ((ev & RTOS_LPUART_RING_BUFFER_OVERRUN) != 0U)
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{
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/* Stop data transfer to application buffer, ring buffer is still active */
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LPUART_TransferAbortReceive(handle->base, handle->t_state);
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/* Prevent false indication of successful transfer in next call of LPUART_RTOS_Receive.
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RTOS_LPUART_COMPLETE flag could be set meanwhile overrun is handled */
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(void)xEventGroupClearBits(handle->rxEvent, RTOS_LPUART_COMPLETE);
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retval = kStatus_LPUART_RxRingBufferOverrun;
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local_received = 0;
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}
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else if ((ev & RTOS_LPUART_COMPLETE) != 0U)
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{
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retval = kStatus_Success;
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local_received = length;
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}
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else
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{
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retval = kStatus_LPUART_Error;
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local_received = 0;
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}
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/* Prevent repetitive NULL check */
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if (received != NULL)
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{
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*received = local_received;
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}
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/* Enable next transfer. Current one is finished */
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if (pdFALSE == xSemaphoreGive(handle->rxSemaphore))
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{
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/* We could not post the semaphore, exit with error */
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retval = kStatus_Fail;
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}
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return retval;
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}
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