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rt-thread-official/bsp/imxrt/libraries/MIMXRT1020/MIMXRT1021/drivers/fsl_lpuart_freertos.c

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