diff options
Diffstat (limited to 'os/hal/platforms/LPC17xx/lpc17xx_dma.c')
| -rw-r--r-- | os/hal/platforms/LPC17xx/lpc17xx_dma.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/os/hal/platforms/LPC17xx/lpc17xx_dma.c b/os/hal/platforms/LPC17xx/lpc17xx_dma.c deleted file mode 100644 index 8a607ddc0..000000000 --- a/os/hal/platforms/LPC17xx/lpc17xx_dma.c +++ /dev/null @@ -1,205 +0,0 @@ -/*
- ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
- LPC17xx DMA driver - Copyright (C) 2013 Marcin Jokel
-
- 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 LPC17xx/LPC17xx_dma.c
- * @brief DMA driver code.
- *
- * @addtogroup LPC17xx_DMA
- * @details DMA sharing helper driver. In the LPC17xx 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 "ch.h"
-#include "hal.h"
-
-/* The following macro is only defined if some driver requiring DMA services
- has been enabled.*/
-#if defined(LPC17xx_DMA_REQUIRED) || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
- LPC_GPDMACH_TypeDef * \
- _lpc17xx_dma_channel_config_t[LPC17xx_DMA_CHANNELS] = {
- LPC_GPDMACH0, LPC_GPDMACH1, LPC_GPDMACH2, LPC_GPDMACH3, LPC_GPDMACH4,
- LPC_GPDMACH5, LPC_GPDMACH6, LPC_GPDMACH7 };
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/**
- * @brief DMA ISR redirector type.
- */
-typedef struct {
- lpc17xx_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[LPC17xx_DMA_CHANNELS];
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-/**
- * @brief DMA interrupt handler.
- *
- * @isr
- */
-CH_IRQ_HANDLER(VectorA8) {
- uint32_t irq_status;
- uint32_t err_status;
- uint8_t i;
-
- CH_IRQ_PROLOGUE();
-
- irq_status = LPC_GPDMA->IntTCStat;
- LPC_GPDMA->IntTCClear = irq_status; /* Clear DMA interrupt flag */
- err_status = LPC_GPDMA->IntErrStat;
- LPC_GPDMA->IntErrClr = err_status; /* Clear DMA error flag if any*/
-
- for (i = 0; i < LPC17xx_DMA_CHANNELS; i++) {
- if (irq_status & (1UL << i)) {
- if (dma_isr_redir[i].dma_func)
- dma_isr_redir[i].dma_func(dma_isr_redir[i].dma_param, err_status);
- }
- }
-
-
- CH_IRQ_EPILOGUE();
-}
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief LPC17xx DMA initialization.
- *
- * @init
- */
-void dmaInit(void) {
- uint8_t i;
-
- LPC_SC->PCONP |= (1UL << 29); /* Enable DMA power */
-
- /* Disable all channels */
- for (i = 0; i < LPC17xx_DMA_CHANNELS; i++)
- _lpc17xx_dma_channel_config_t[i]->CConfig = 0;
-
- LPC_GPDMA->IntTCClear = 0xFF;
- LPC_GPDMA->IntErrClr = 0xFF;
-
- LPC_GPDMA->Config = DMACCONFIG_E; /* Enable DMA Controller */
- while((LPC_GPDMA->Config & DMACCONFIG_E) != 0x01)
- ;
-
- nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC17xx_DMA_IRQ_PRIORITY));
-}
-
-/**
- * @brief Allocates a DMA channel.
- * @details The channel is allocated.
- * @pre The channel must not be already in use or an error is returned.
- * @post The channel is allocated and the default ISR handler redirected
- * to the specified function.
- * @post The channel must be freed using @p dmaChannelRelease() before it can
- * be reused with another peripheral.
- * @note This function can be invoked in both ISR or thread context.
- *
- * @param[in] dmach DMA channel number
- * @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_t dmaChannelAllocate(lpc17xx_dma_channel_t dmach,
- lpc17xx_dmaisr_t func,
- void *param) {
- uint32_t channel;
- channel = (1UL << dmach);
-
- /* Checks if the channel is already taken.*/
- if ((dma_streams_mask & channel) != 0)
- return TRUE;
-
- /* Marks the stream as allocated.*/
- dma_isr_redir[dmach].dma_func = func;
- dma_isr_redir[dmach].dma_param = param;
- dma_streams_mask |= channel;
-
- return FALSE;
-}
-
-/**
- * @brief Releases a DMA channel.
- * @details The channel is freed.
- * Trying to release a unallocated channel is an illegal operation
- * and is trapped if assertions are enabled.
- * @pre The channel must have been allocated using @p dmaChannelAllocate().
- * @post The channel is again available.
- * @note This function can be invoked in both ISR or thread context.
- *
- * @param[in] dmach DMA channel number
- *
- * @special
- */
-void dmaChannelRelease(lpc17xx_dma_channel_t dmach) {
-
- uint32_t channel;
- channel = (1UL << dmach);
-
- /* Check if the streams is not taken.*/
- chDbgAssert((dma_streams_mask & channel) != 0,
- "dmaStreamRelease(), #1", "not allocated");
-
- dma_streams_mask &= ~channel; /* Marks the stream as not allocated.*/
-}
-
-#endif /* LPC17xx_DMA_REQUIRED */
-
-/** @} */
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