Stub DMA driver.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@14190 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
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Giovanni Di Sirio
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PLATFORMSRC += $(CHIBIOS)/os/hal/ports/RP/LLD/DMAv1/rp_dma.c
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PLATFORMINC += $(CHIBIOS)/os/hal/ports/RP/LLD/DMAv1
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/*
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ChibiOS - Copyright (C) 2006..2018 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 DMAv1/rp_dma.c
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* @brief DMA helper driver code.
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*
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* @addtogroup RP_DMA
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* @details DMA sharing helper driver. In RP2 the DMA channels are a
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* shared resource, this driver allows to allocate and free DMA
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* channels 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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* @{
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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(RP_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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/* Driver exported variables. */
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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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/* 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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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief 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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}
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/**
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* @brief Allocates a DMA channel.
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*
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* @param[in] id numeric identifiers of a specific channel or:
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* - @p RP_DMA_CHANNEL_ID_ANY for any channel.
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* .
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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 Pointer to the allocated @p rp_dma_channel_t
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* structure.
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* @retval NULL if a/the channel is not available.
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*
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* @iclass
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*/
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const rp_dma_channel_t *dmaStreamAllocI(uint32_t id,
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rp_dmaisr_t func,
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void *param) {
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}
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/**
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* @brief Allocates a DMA channel.
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* @details The channel is allocated and, if required, the DMA clock enabled.
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* The function also enables the IRQ vector associated to the channel
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* and initializes its priority.
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*
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* @param[in] id numeric identifiers of a specific channel or:
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* - @p RP_DMA_CHANNEL_ID_ANY for any channel.
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* .
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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 Pointer to the allocated @p rp_dma_channel_t
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* structure.
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* @retval NULL if a/the channel is not available.
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*
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* @api
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*/
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const rp_dma_channel_t *dmaStreamAlloc(uint32_t id,
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uint32_t priority,
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rp_dmaisr_t func,
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void *param) {
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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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* @param[in] dmachp pointer to a rp_dma_channel_t structure
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*
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* @iclass
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*/
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void dmaStreamFreeI(const rp_dma_channel_t *dmachp) {
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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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* @param[in] dmachp pointer to a rp_dma_channel_t structure
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*
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* @api
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*/
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void dmaStreamFree(const rp_dma_channel_t *dmachp) {
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}
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/**
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* @brief Serves a DMA IRQ.
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*
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* @param[in] dmachp pointer to a rp_dma_channel_t structure
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*
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* @special
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*/
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void dmaServeInterrupt(const rp_dma_channel_t *dmachp) {
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}
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#endif /* RP_DMA_REQUIRED */
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/** @} */
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/*
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ChibiOS - Copyright (C) 2006..2018 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 DMAv1/rp_dma.h
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* @brief DMA helper driver header.
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*
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* @addtogroup RP_DMA
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* @{
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*/
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#ifndef RP_DMA_H
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#define RP_DMA_H
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/**
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* @brief Total number of DMA channels.
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*/
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#define RP_DMA_CHANNELS 12U
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/**
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* @brief Checks if a DMA channels id is within the valid range.
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*
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* @param[in] id DMA channels id
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* @retval The check result.
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* @retval false invalid DMA channel.
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* @retval true correct DMA channel.
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*/
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#define RP_DMA_IS_VALID_CHANNEL(chn) (((chn) >= 0U) && \
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((id) <= (RP_DMA_CHANNELS + 1U)))
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/**
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* @name Special stream identifiers
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* @{
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*/
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#define RP_DMA_STREAM_ID_ANY RP_DMA_CHANNELS
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/** @} */
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Type of a DMA callback.
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*
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* @param[in] p parameter for the registered function
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* @param[in] flags pre-shifted content of the ISR register, the bits
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* are aligned to bit zero
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*/
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typedef void (*rp_dmaisr_t)(void *p, uint32_t flags);
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/**
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* @brief RP DMA stream descriptor structure.
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*/
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typedef struct {
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DMA_TypeDef *dma; /**< @brief Associated DMA. */
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} rp_dma_channel_t;
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @name Macro Functions
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* @{
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*/
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/** @} */
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if !defined(__DOXYGEN__)
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extern const stm32_dma_stream_t _stm32_dma_streams[STM32_DMA_STREAMS];
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void dmaInit(void);
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const rp_dma_channel_t *dmaStreamAllocI(uint32_t id,
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rp_dmaisr_t func,
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void *param);
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const rp_dma_channel_t *dmaStreamAlloc(uint32_t id,
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rp_dmaisr_t func,
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void *param);
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void dmaStreamFreeI(const rp_dma_channel_t *dmachp);
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void dmaStreamFree(const rp_dma_channel_t *dmachp);
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void dmaServeInterrupt(const rp_dma_channel_t *dmachp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* RP_DMA_H */
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/** @} */
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