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tinySA/os/hal/ports/STM32/STM32L1xx/stm32_dma.c

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file STM32L1xx/stm32_dma.c
* @brief DMA helper driver code.
*
* @addtogroup STM32L1xx_DMA
* @details DMA sharing helper driver. In the STM32 the DMA streams are a
* shared resource, this driver allows to allocate and free DMA
* streams at runtime in order to allow all the other device
* drivers to coordinate the access to the resource.
* @note The DMA ISR handlers are all declared into this module because
* sharing, the various device drivers can associate a callback to
* ISRs when allocating streams.
* @{
*/
#include "hal.h"
/* The following macro is only defined if some driver requiring DMA services
has been enabled.*/
#if defined(STM32_DMA_REQUIRED) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/**
* @brief Mask of the DMA1 streams in @p dma_streams_mask.
*/
#define STM32_DMA1_STREAMS_MASK 0x0000007F
/**
* @brief Mask of the DMA2 streams in @p dma_streams_mask.
*/
#define STM32_DMA2_STREAMS_MASK 0x00000F80
/**
* @brief Post-reset value of the stream CCR register.
*/
#define STM32_DMA_CCR_RESET_VALUE 0x00000000
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief DMA streams descriptors.
* @details This table keeps the association between an unique stream
* identifier and the involved physical registers.
* @note Don't use this array directly, use the appropriate wrapper macros
* instead: @p STM32_DMA1_STREAM1, @p STM32_DMA1_STREAM2 etc.
*/
const stm32_dma_stream_t _stm32_dma_streams[STM32_DMA_STREAMS] = {
{DMA1_Channel1, &DMA1->IFCR, 0, 0, DMA1_Channel1_IRQn},
{DMA1_Channel2, &DMA1->IFCR, 4, 1, DMA1_Channel2_IRQn},
{DMA1_Channel3, &DMA1->IFCR, 8, 2, DMA1_Channel3_IRQn},
{DMA1_Channel4, &DMA1->IFCR, 12, 3, DMA1_Channel4_IRQn},
{DMA1_Channel5, &DMA1->IFCR, 16, 4, DMA1_Channel5_IRQn},
{DMA1_Channel6, &DMA1->IFCR, 20, 5, DMA1_Channel6_IRQn},
{DMA1_Channel7, &DMA1->IFCR, 24, 6, DMA1_Channel7_IRQn}
};
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief DMA ISR redirector type.
*/
typedef struct {
stm32_dmaisr_t dma_func; /**< @brief DMA callback function. */
void *dma_param; /**< @brief DMA callback parameter. */
} dma_isr_redir_t;
/**
* @brief Mask of the allocated streams.
*/
static uint32_t dma_streams_mask;
/**
* @brief DMA IRQ redirectors.
*/
static dma_isr_redir_t dma_isr_redir[STM32_DMA_STREAMS];
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief DMA1 stream 1 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector6C) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 0) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 0;
if (dma_isr_redir[0].dma_func)
dma_isr_redir[0].dma_func(dma_isr_redir[0].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/**
* @brief DMA1 stream 2 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector70) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 4) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 4;
if (dma_isr_redir[1].dma_func)
dma_isr_redir[1].dma_func(dma_isr_redir[1].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/**
* @brief DMA1 stream 3 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector74) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 8) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 8;
if (dma_isr_redir[2].dma_func)
dma_isr_redir[2].dma_func(dma_isr_redir[2].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/**
* @brief DMA1 stream 4 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector78) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 12) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 12;
if (dma_isr_redir[3].dma_func)
dma_isr_redir[3].dma_func(dma_isr_redir[3].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/**
* @brief DMA1 stream 5 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector7C) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 16) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 16;
if (dma_isr_redir[4].dma_func)
dma_isr_redir[4].dma_func(dma_isr_redir[4].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/**
* @brief DMA1 stream 6 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector80) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 20) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 20;
if (dma_isr_redir[5].dma_func)
dma_isr_redir[5].dma_func(dma_isr_redir[5].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/**
* @brief DMA1 stream 7 shared interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(Vector84) {
uint32_t flags;
OSAL_IRQ_PROLOGUE();
flags = (DMA1->ISR >> 24) & STM32_DMA_ISR_MASK;
DMA1->IFCR = flags << 24;
if (dma_isr_redir[6].dma_func)
dma_isr_redir[6].dma_func(dma_isr_redir[6].dma_param, flags);
OSAL_IRQ_EPILOGUE();
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief STM32 DMA helper initialization.
*
* @init
*/
void dmaInit(void) {
int i;
dma_streams_mask = 0;
for (i = 0; i < STM32_DMA_STREAMS; i++) {
_stm32_dma_streams[i].channel->CCR = 0;
dma_isr_redir[i].dma_func = NULL;
}
DMA1->IFCR = 0xFFFFFFFF;
}
/**
* @brief Allocates a DMA stream.
* @details The stream is allocated and, if required, the DMA clock enabled.
* The function also enables the IRQ vector associated to the stream
* and initializes its priority.
* @pre The stream must not be already in use or an error is returned.
* @post The stream is allocated and the default ISR handler redirected
* to the specified function.
* @post The stream ISR vector is enabled and its priority configured.
* @post The stream must be freed using @p dmaStreamRelease() before it can
* be reused with another peripheral.
* @post The stream is in its post-reset state.
* @note This function can be invoked in both ISR or thread context.
*
* @param[in] dmastp pointer to a stm32_dma_stream_t structure
* @param[in] priority IRQ priority mask for the DMA stream
* @param[in] func handling function pointer, can be @p NULL
* @param[in] param a parameter to be passed to the handling function
* @return The operation status.
* @retval FALSE no error, stream taken.
* @retval TRUE error, stream already taken.
*
* @special
*/
bool dmaStreamAllocate(const stm32_dma_stream_t *dmastp,
uint32_t priority,
stm32_dmaisr_t func,
void *param) {
osalDbgCheck(dmastp != NULL);
/* Checks if the stream is already taken.*/
if ((dma_streams_mask & (1 << dmastp->selfindex)) != 0)
return TRUE;
/* Marks the stream as allocated.*/
dma_isr_redir[dmastp->selfindex].dma_func = func;
dma_isr_redir[dmastp->selfindex].dma_param = param;
dma_streams_mask |= (1 << dmastp->selfindex);
/* Enabling DMA clocks required by the current streams set.*/
if ((dma_streams_mask & STM32_DMA1_STREAMS_MASK) != 0)
rccEnableDMA1(FALSE);
/* Putting the stream in a safe state.*/
dmaStreamDisable(dmastp);
dmastp->channel->CCR = STM32_DMA_CCR_RESET_VALUE;
/* Enables the associated IRQ vector if a callback is defined.*/
if (func != NULL)
nvicEnableVector(dmastp->vector, priority);
return FALSE;
}
/**
* @brief Releases a DMA stream.
* @details The stream is freed and, if required, the DMA clock disabled.
* Trying to release a unallocated stream is an illegal operation
* and is trapped if assertions are enabled.
* @pre The stream must have been allocated using @p dmaStreamAllocate().
* @post The stream is again available.
* @note This function can be invoked in both ISR or thread context.
*
* @param[in] dmastp pointer to a stm32_dma_stream_t structure
*
* @special
*/
void dmaStreamRelease(const stm32_dma_stream_t *dmastp) {
osalDbgCheck(dmastp != NULL);
/* Check if the streams is not taken.*/
osalDbgAssert((dma_streams_mask & (1 << dmastp->selfindex)) != 0,
"not allocated");
/* Disables the associated IRQ vector.*/
nvicDisableVector(dmastp->vector);
/* Marks the stream as not allocated.*/
dma_streams_mask &= ~(1 << dmastp->selfindex);
/* Shutting down clocks that are no more required, if any.*/
if ((dma_streams_mask & STM32_DMA1_STREAMS_MASK) == 0)
rccDisableDMA1(FALSE);
}
#endif /* STM32_DMA_REQUIRED */
/** @} */
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