142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*
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Copyright (C) 2014..2016 Marco Veeneman
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "hal.h"
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/* The following macro is only defined if some driver requiring DMA services
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has been enabled.*/
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#if defined(TIVA_UDMA_REQUIRED) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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udmaControlTable_t udmaControlTable;
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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static uint32_t udma_channel_mask;
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if !defined(TIVA_UDMA_SW_HANDLER)
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#error "TIVA_UDMA_SW_HANDLER not defined"
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#endif
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/**
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* @brief UDMA software interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(TIVA_UDMA_SW_HANDLER)
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{
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OSAL_IRQ_PROLOGUE();
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/* TODO Process software transfer interrupts.*/
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OSAL_IRQ_EPILOGUE();
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}
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#if !defined(TIVA_UDMA_ERR_HANDLER)
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#error "TIVA_UDMA_ERR_HANDLER not defined"
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#endif
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/**
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* @brief UDMA error interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(TIVA_UDMA_ERR_HANDLER)
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{
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OSAL_IRQ_PROLOGUE();
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/* TODO Do we need to halt the system on a DMA error?*/
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if (UDMA->ERRCLR) {
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UDMA->ERRCLR = 1;
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}
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OSAL_IRQ_EPILOGUE();
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Initialize UDMA.
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*
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* @init
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*/
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void udmaInit(void)
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{
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udma_channel_mask = 0;
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/* Enable UDMA module.*/
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SYSCTL->RCGCDMA = 1;
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while (!(SYSCTL->PRDMA & (1 << 0)))
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;
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nvicEnableVector(TIVA_UDMA_ERR_NUMBER, TIVA_UDMA_ERR_IRQ_PRIORITY);
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nvicEnableVector(TIVA_UDMA_SW_NUMBER, TIVA_UDMA_SW_IRQ_PRIORITY);
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/* Enable UDMA controller.*/
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UDMA->CFG = 1;
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/* Set address of control table.*/
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UDMA->CTLBASE = (uint32_t)udmaControlTable.primary;
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}
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/**
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* @brief Allocates a DMA channel.
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*
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* @special
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*/
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bool udmaChannelAllocate(uint8_t dmach)
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{
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/* Checks if the channel is already taken.*/
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if ((udma_channel_mask & (1 << dmach)) != 0)
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return TRUE;
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/* Mark channel as used */
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udma_channel_mask |= (1 << dmach);
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return FALSE;
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}
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/**
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* @brief Releases a DMA channel.
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*
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* @special
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*/
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void udmaChannelRelease(uint8_t dmach)
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{
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/* Marks the channel as not used.*/
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udma_channel_mask &= ~(1 << dmach);
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}
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#endif
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