345 lines
11 KiB
C
345 lines
11 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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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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/**
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* @file STM32L1xx/stm32_dma.c
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* @brief DMA helper driver code.
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*
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* @addtogroup STM32L1xx_DMA
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* @details DMA sharing helper driver. In the STM32 the DMA streams are a
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* shared resource, this driver allows to allocate and free DMA
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* streams at runtime in order to allow all the other device
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* drivers to coordinate the access to the resource.
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* @note The DMA ISR handlers are all declared into this module because
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* sharing, the various device drivers can associate a callback to
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* ISRs when allocating streams.
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* @{
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*/
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#include "ch.h"
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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(STM32_DMA_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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* @brief Mask of the DMA1 streams in @p dma_streams_mask.
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*/
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#define STM32_DMA1_STREAMS_MASK 0x0000007F
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/**
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* @brief Mask of the DMA2 streams in @p dma_streams_mask.
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*/
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#define STM32_DMA2_STREAMS_MASK 0x00000F80
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/**
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* @brief Post-reset value of the stream CCR register.
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*/
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#define STM32_DMA_CCR_RESET_VALUE 0x00000000
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief DMA streams descriptors.
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* @details This table keeps the association between an unique stream
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* identifier and the involved physical registers.
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* @note Don't use this array directly, use the appropriate wrapper macros
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* instead: @p STM32_DMA1_STREAM1, @p STM32_DMA1_STREAM2 etc.
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*/
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const stm32_dma_stream_t _stm32_dma_streams[STM32_DMA_STREAMS] = {
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{DMA1_Channel1, &DMA1->IFCR, 0, 0, DMA1_Channel1_IRQn},
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{DMA1_Channel2, &DMA1->IFCR, 4, 1, DMA1_Channel2_IRQn},
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{DMA1_Channel3, &DMA1->IFCR, 8, 2, DMA1_Channel3_IRQn},
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{DMA1_Channel4, &DMA1->IFCR, 12, 3, DMA1_Channel4_IRQn},
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{DMA1_Channel5, &DMA1->IFCR, 16, 4, DMA1_Channel5_IRQn},
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{DMA1_Channel6, &DMA1->IFCR, 20, 5, DMA1_Channel6_IRQn},
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{DMA1_Channel7, &DMA1->IFCR, 24, 6, DMA1_Channel7_IRQn}
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};
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/**
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* @brief DMA ISR redirector type.
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*/
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typedef struct {
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stm32_dmaisr_t dma_func; /**< @brief DMA callback function. */
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void *dma_param; /**< @brief DMA callback parameter. */
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} dma_isr_redir_t;
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/**
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* @brief Mask of the allocated streams.
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*/
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static uint32_t dma_streams_mask;
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/**
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* @brief DMA IRQ redirectors.
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*/
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static dma_isr_redir_t dma_isr_redir[STM32_DMA_STREAMS];
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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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/**
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* @brief DMA1 stream 1 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch1_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 0) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 0;
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if (dma_isr_redir[0].dma_func)
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dma_isr_redir[0].dma_func(dma_isr_redir[0].dma_param, flags);
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief DMA1 stream 2 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch2_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 4) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 4;
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if (dma_isr_redir[1].dma_func)
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dma_isr_redir[1].dma_func(dma_isr_redir[1].dma_param, flags);
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief DMA1 stream 3 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch3_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 8) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 8;
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if (dma_isr_redir[2].dma_func)
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dma_isr_redir[2].dma_func(dma_isr_redir[2].dma_param, flags);
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief DMA1 stream 4 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch4_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 12) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 12;
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if (dma_isr_redir[3].dma_func)
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dma_isr_redir[3].dma_func(dma_isr_redir[3].dma_param, flags);
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief DMA1 stream 5 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch5_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 16) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 16;
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if (dma_isr_redir[4].dma_func)
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dma_isr_redir[4].dma_func(dma_isr_redir[4].dma_param, flags);
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief DMA1 stream 6 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch6_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 20) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 20;
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if (dma_isr_redir[5].dma_func)
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dma_isr_redir[5].dma_func(dma_isr_redir[5].dma_param, flags);
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CH_IRQ_EPILOGUE();
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}
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/**
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* @brief DMA1 stream 7 shared interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(DMA1_Ch7_IRQHandler) {
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uint32_t flags;
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CH_IRQ_PROLOGUE();
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flags = (DMA1->ISR >> 24) & STM32_DMA_ISR_MASK;
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DMA1->IFCR = STM32_DMA_ISR_MASK << 24;
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if (dma_isr_redir[6].dma_func)
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dma_isr_redir[6].dma_func(dma_isr_redir[6].dma_param, flags);
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CH_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 STM32 DMA helper initialization.
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*
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* @init
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*/
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void dmaInit(void) {
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int i;
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dma_streams_mask = 0;
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for (i = 0; i < STM32_DMA_STREAMS; i++) {
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_stm32_dma_streams[i].channel->CCR = 0;
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dma_isr_redir[i].dma_func = NULL;
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}
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DMA1->IFCR = 0xFFFFFFFF;
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}
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/**
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* @brief Allocates a DMA stream.
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* @details The stream is allocated and, if required, the DMA clock enabled.
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* The function also enables the IRQ vector associated to the stream
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* and initializes its priority.
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* @pre The stream must not be already in use or an error is returned.
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* @post The stream is allocated and the default ISR handler redirected
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* to the specified function.
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* @post The stream ISR vector is enabled and its priority configured.
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* @post The stream must be freed using @p dmaStreamRelease() before it can
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* be reused with another peripheral.
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* @post The stream is in its post-reset state.
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* @note This function can be invoked in both ISR or thread context.
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*
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* @param[in] dmastp pointer to a stm32_dma_stream_t structure
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* @param[in] priority IRQ priority mask for the DMA stream
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* @param[in] func handling function pointer, can be @p NULL
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* @param[in] param a parameter to be passed to the handling function
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* @return The operation status.
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* @retval FALSE no error, stream taken.
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* @retval TRUE error, stream already taken.
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*
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* @special
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*/
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bool_t dmaStreamAllocate(const stm32_dma_stream_t *dmastp,
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uint32_t priority,
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stm32_dmaisr_t func,
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void *param) {
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chDbgCheck(dmastp != NULL, "dmaStreamAllocate");
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/* Checks if the stream is already taken.*/
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if ((dma_streams_mask & (1 << dmastp->selfindex)) != 0)
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return TRUE;
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/* Marks the stream as allocated.*/
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dma_isr_redir[dmastp->selfindex].dma_func = func;
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dma_isr_redir[dmastp->selfindex].dma_param = param;
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dma_streams_mask |= (1 << dmastp->selfindex);
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/* Enabling DMA clocks required by the current streams set.*/
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if ((dma_streams_mask & STM32_DMA1_STREAMS_MASK) != 0)
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rccEnableDMA1(FALSE);
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/* Putting the stream in a safe state.*/
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dmaStreamDisable(dmastp);
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dmastp->channel->CCR = STM32_DMA_CCR_RESET_VALUE;
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/* Enables the associated IRQ vector if a callback is defined.*/
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if (func != NULL)
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nvicEnableVector(dmastp->vector, CORTEX_PRIORITY_MASK(priority));
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return FALSE;
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}
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/**
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* @brief Releases a DMA stream.
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* @details The stream is freed and, if required, the DMA clock disabled.
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* Trying to release a unallocated stream is an illegal operation
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* and is trapped if assertions are enabled.
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* @pre The stream must have been allocated using @p dmaStreamAllocate().
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* @post The stream is again available.
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* @note This function can be invoked in both ISR or thread context.
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*
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* @param[in] dmastp pointer to a stm32_dma_stream_t structure
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*
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* @special
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*/
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void dmaStreamRelease(const stm32_dma_stream_t *dmastp) {
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chDbgCheck(dmastp != NULL, "dmaStreamRelease");
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/* Check if the streams is not taken.*/
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chDbgAssert((dma_streams_mask & (1 << dmastp->selfindex)) != 0,
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"dmaStreamRelease(), #1", "not allocated");
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/* Disables the associated IRQ vector.*/
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nvicDisableVector(dmastp->vector);
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/* Marks the stream as not allocated.*/
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dma_streams_mask &= ~(1 << dmastp->selfindex);
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/* Shutting down clocks that are no more required, if any.*/
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if ((dma_streams_mask & STM32_DMA1_STREAMS_MASK) == 0)
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rccDisableDMA1(FALSE);
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}
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#endif /* STM32_DMA_REQUIRED */
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/** @} */
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