/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011 Giovanni Di Sirio. This file is part of ChibiOS/RT. ChibiOS/RT is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. ChibiOS/RT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /** * @file STM32F2xx/stm32_dma.h * @brief Enhanced-DMA helper driver header. * @note This file requires definitions from the ST STM32F2xx header file * stm32f2xx.h. * * @addtogroup STM32F2xx_DMA * @{ */ #ifndef _STM32_DMA_H_ #define _STM32_DMA_H_ /*===========================================================================*/ /* Driver constants. */ /*===========================================================================*/ /** * @brief Total number of DMA streams. * @note This is the total number of streams among all the DMA units. */ #define STM32_DMA_STREAMS 16 /** * @brief Mask of the ISR bits passed to the DMA callback functions. */ #define STM32_DMA_ISR_MASK 0x3D /** * @brief Returns the channel associated to the specified stream. * * @param[in] id the unique numeric stream identifier * @param[in] c a stream/channel association word, one channel per * nibble * @return Returns the channel associated to the stream. */ #define STM32_DMA_GETCHANNEL(id, c) (((c) & 15) >> (((id) & 7) * 4)) /** * @brief Returns an unique numeric identifier for a DMA stream. * * @param[in] dma the DMA unit number * @param[in] stream the stream number * @return An unique numeric stream identifier. */ #define STM32_DMA_STREAM_ID(dma, stream) ((((dma) - 1) * 8) + (stream)) /** * @brief Returns a DMA stream identifier mask. * * * @param[in] dma the DMA unit number * @param[in] stream the stream number * @return A DMA stream identifier mask. */ #define STM32_DMA_STREAM_ID_MSK(dma, stream) \ (1 << STM32_DMA_STREAM_ID(dma, stream)) /** * @brief Checks if a DMA stream unique identifier belongs to a mask. * @param[in] id the stream numeric identifier * @param[in] mask the stream numeric identifiers mask * * @retval The check result. * @retval FALSE id does not belong to the mask. * @retval TRUE id belongs to the mask. */ #define STM32_DMA_IS_VALID_ID(id, mask) (((1 << (id)) & (mask))) /** * @name DMA streams identifiers * @{ */ /** * @brief Returns a pointer to a stm32_dma_stream_t structure. * * @param[in] id the stream numeric identifier * @return A pointer to the stm32_dma_stream_t constant structure * associated to the DMA stream. */ #define STM32_DMA_STREAM(id) (&_stm32_dma_streams[id]) #define STM32_DMA1_STREAM0 STM32_DMA_STREAM(0) #define STM32_DMA1_STREAM1 STM32_DMA_STREAM(1) #define STM32_DMA1_STREAM2 STM32_DMA_STREAM(2) #define STM32_DMA1_STREAM3 STM32_DMA_STREAM(3) #define STM32_DMA1_STREAM4 STM32_DMA_STREAM(4) #define STM32_DMA1_STREAM5 STM32_DMA_STREAM(5) #define STM32_DMA1_STREAM6 STM32_DMA_STREAM(6) #define STM32_DMA1_STREAM7 STM32_DMA_STREAM(7) #define STM32_DMA2_STREAM0 STM32_DMA_STREAM(8) #define STM32_DMA2_STREAM1 STM32_DMA_STREAM(9) #define STM32_DMA2_STREAM2 STM32_DMA_STREAM(10) #define STM32_DMA2_STREAM3 STM32_DMA_STREAM(11) #define STM32_DMA2_STREAM4 STM32_DMA_STREAM(12) #define STM32_DMA2_STREAM5 STM32_DMA_STREAM(13) #define STM32_DMA2_STREAM6 STM32_DMA_STREAM(14) #define STM32_DMA2_STREAM7 STM32_DMA_STREAM(15) /** @} */ /** * @name CR register constants common to all DMA types * @{ */ #define STM32_DMA_CR_EN DMA_SxCR_EN #define STM32_DMA_CR_TEIE DMA_SxCR_TEIE #define STM32_DMA_CR_HTIE DMA_SxCR_HTIE #define STM32_DMA_CR_TCIE DMA_SxCR_TCIE #define STM32_DMA_CR_DIR_MASK DMA_SxCR_DIR #define STM32_DMA_CR_DIR_P2M 0 #define STM32_DMA_CR_DIR_M2P DMA_SxCR_DIR_0 #define STM32_DMA_CR_DIR_M2M DMA_SxCR_DIR_1 #define STM32_DMA_CR_CIRC DMA_SxCR_CIRC #define STM32_DMA_CR_PINC DMA_SxCR_PINC #define STM32_DMA_CR_MINC DMA_SxCR_MINC #define STM32_DMA_CR_PSIZE_MASK DMA_SxCR_PSIZE #define STM32_DMA_CR_PSIZE_BYTE 0 #define STM32_DMA_CR_PSIZE_HWORD DMA_SxCR_PSIZE_0 #define STM32_DMA_CR_PSIZE_WORD DMA_SxCR_PSIZE_1 #define STM32_DMA_CR_MSIZE_MASK DMA_SxCR_MSIZE #define STM32_DMA_CR_MSIZE_BYTE 0 #define STM32_DMA_CR_MSIZE_HWORD DMA_SxCR_MSIZE_0 #define STM32_DMA_CR_MSIZE_WORD DMA_SxCR_MSIZE_1 #define STM32_DMA_CR_SIZE_MASK (STM32_DMA_CR_MSIZE_MASK | \ STM32_DMA_CR_MSIZE_MASK) #define STM32_DMA_CR_PL_MASK DMA_SxCR_PL #define STM32_DMA_CR_PL(n) (((n) << 16) & (STM32_DMA_CR_PL_MASK)) /** @} */ /** * @name CR register constants only found in STM32F2xx/STM32F2xx * @{ */ #define STM32_DMA_CR_DMEIE DMA_SxCR_DMEIE #define STM32_DMA_CR_PFCTRL DMA_SxCR_PFCTRL #define STM32_DMA_CR_PINCOS DMA_SxCR_PINCOS #define STM32_DMA_CR_DBM DMA_SxCR_DBM #define STM32_DMA_CR_CT DMA_SxCR_CT #define STM32_DMA_CR_PBURST_MASK DMA_SxCR_PBURST #define STM32_DMA_CR_PBURST_SINGLE 0 #define STM32_DMA_CR_PBURST_INCR4 DMA_SxCR_PBURST_0 #define STM32_DMA_CR_PBURST_INCR8 DMA_SxCR_PBURST_1 #define STM32_DMA_CR_PBURST_INCR16 (DMA_SxCR_PBURST_0 | DMA_SxCR_PBURST_1) #define STM32_DMA_CR_MBURST_MASK DMA_SxCR_MBURST #define STM32_DMA_CR_MBURST_SINGLE 0 #define STM32_DMA_CR_MBURST_INCR4 DMA_SxCR_MBURST_0 #define STM32_DMA_CR_MBURST_INCR8 DMA_SxCR_MBURST_1 #define STM32_DMA_CR_MBURST_INCR16 (DMA_SxCR_MBURST_0 | DMA_SxCR_MBURST_1) #define STM32_DMA_CR_CHSEL_MASK DMA_SxCR_CHSEL #define STM32_DMA_CR_CHSEL(n) ((n) << 25) /** @} */ /** * @name FCR register constants only found in STM32F2xx/STM32F2xx * @{ */ #define STM32_DMA_FCR_FEIE DMA_SxFCR_FEIE #define STM32_DMA_FCR_FS_MASK DMA_SxFCR_FS #define STM32_DMA_FCR_DMDIS DMA_SxFCR_DMDIS #define STM32_DMA_FCR_FTH_MASK DMA_SxFCR_FTH #define STM32_DMA_FCR_FTH_1Q 0 #define STM32_DMA_FCR_FTH_HALF DMA_SxFCR_FTH_0 #define STM32_DMA_FCR_FTH_3Q DMA_SxFCR_FTH_1 #define STM32_DMA_FCR_FTH_FULL (DMA_SxFCR_FTH_0 | DMA_SxFCR_FTH_1) /** @} */ /** * @name Status flags passed to the ISR callbacks */ #define STM32_DMA_ISR_FEIF DMA_LISR_FEIF0 #define STM32_DMA_ISR_DMEIF DMA_LISR_DMEIF0 #define STM32_DMA_ISR_TEIF DMA_LISR_TEIF0 #define STM32_DMA_ISR_HTIF DMA_LISR_HTIF0 #define STM32_DMA_ISR_TCIF DMA_LISR_TCIF0 /** @} */ /*===========================================================================*/ /* Driver pre-compile time settings. */ /*===========================================================================*/ /*===========================================================================*/ /* Derived constants and error checks. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver data structures and types. */ /*===========================================================================*/ /** * @brief STM32 DMA stream descriptor structure. */ typedef struct { DMA_Stream_TypeDef *stream; /**< @brief Associated DMA stream. */ volatile uint32_t *ifcr; /**< @brief Associated IFCR reg. */ uint8_t ishift; /**< @brief Bits offset in xIFCR register. */ uint8_t selfindex; /**< @brief Index to self in array. */ uint8_t vector; /**< @brief Associated IRQ vector. */ } stm32_dma_stream_t; /** * @brief STM32 DMA ISR function type. * * @param[in] p parameter for the registered function * @param[in] flags pre-shifted content of the xISR register, the bits * are aligned to bit zero */ typedef void (*stm32_dmaisr_t)(void *p, uint32_t flags); /*===========================================================================*/ /* Driver macros. */ /*===========================================================================*/ /** * @name Macro Functions * @{ */ /** * @brief Associates a peripheral data register to a DMA stream. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @param[in] addr value to be written in the PAR register * * @special */ #define dmaStreamSetPeripheral(dmastp, addr) { \ (dmastp)->stream->PAR = (uint32_t)(addr); \ } /** * @brief Associates a memory destination to a DMA stream. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @param[in] addr value to be written in the M0AR register * * @special */ #define dmaStreamSetMemory0(dmastp, addr) { \ (dmastp)->stream->M0AR = (uint32_t)(addr); \ } /** * @brief Associates an alternate memory destination to a DMA stream. * @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] addr value to be written in the M1AR register * * @special */ #define dmaStreamSetMemory1(dmastp, addr) { \ (dmastp)->stream->M1AR = (uint32_t)(addr); \ } /** * @brief Sets the number of transfers to be performed. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @param[in] size value to be written in the CNDTR register * * @special */ #define dmaStreamSetTransactionSize(dmastp, size) { \ (dmastp)->stream->NDTR = (uint32_t)(size); \ } /** * @brief Returns the number of transfers to be performed. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @return The number of transfers to be performed. * * @special */ #define dmaStreamGetTransactionSize(dmastp) ((size_t)((dmastp)->stream->NDTR)) /** * @brief Programs the stream mode settings. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @param[in] mode value to be written in the CR register * * @special */ #define dmaStreamSetMode(dmastp, mode) { \ (dmastp)->stream->CR = (uint32_t)(mode); \ } /** * @brief Programs the stream FIFO settings. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @param[in] mode value to be written in the FCR register * * @special */ #define dmaStreamSetFIFO(dmastp, mode) { \ (dmastp)->stream->FCR = (uint32_t)(mode); \ } /** * @brief DMA stream enable. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * * @special */ #define dmaStreamEnable(dmastp) { \ (dmastp)->stream->CR |= STM32_DMA_CR_EN; \ } /** * @brief DMA stream disable. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * * @special */ #define dmaStreamDisable(dmastp) { \ (dmastp)->stream->CR &= ~STM32_DMA_CR_EN; \ } /** * @brief DMA stream interrupt sources clear. * @note This function can be invoked in both ISR or thread context. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * * @special */ #define dmaStreamClearInterrupt(dmastp) { \ *(dmastp)->ifcr = STM32_DMA_ISR_MASK << (dmastp)->ishift; \ } /** * @brief Starts a memory to memory operation using the specified stream. * @note The default transfer data mode is "byte to byte" but it can be * changed by specifying extra options in the @p mode parameter. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure * @param[in] mode value to be written in the CCR register, this value * is implicitly ORed with: * - @p STM32_DMA_CR_MINC * - @p STM32_DMA_CR_PINC * - @p STM32_DMA_CR_DIR_M2M * - @p STM32_DMA_CR_EN * . * @param[in] src source address * @param[in] dst destination address * @param[in] n number of data units to copy */ #define dmaStartMemCopy(dmastp, mode, src, dst, n) { \ dmaStreamSetPeripheral(dmastp, src); \ dmaStreamSetMemory0(dmastp, dst); \ dmaStreamSetTransactionSize(dmastp, n); \ dmaStreamSetMode(dmastp, (mode) | \ STM32_DMA_CR_MINC | STM32_DMA_CR_PINC | \ STM32_DMA_CR_DIR_M2M | STM32_DMA_CR_EN); \ } /** * @brief Polled wait for DMA transfer end. * @pre The stream must have been allocated using @p dmaStreamAllocate(). * @post After use the stream can be released using @p dmaStreamRelease(). * * @param[in] dmastp pointer to a stm32_dma_stream_t structure */ #define dmaWaitCompletion(dmastp) \ while (((dmastp)->stream->CNDTR > 0) && \ ((dmastp)->stream->CCR & STM32_DMA_CR_EN)) /** @} */ /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ #if !defined(__DOXYGEN__) extern const stm32_dma_stream_t _stm32_dma_streams[STM32_DMA_STREAMS]; #endif #ifdef __cplusplus extern "C" { #endif void dmaInit(void); bool_t dmaStreamAllocate(const stm32_dma_stream_t *dmastp, uint32_t priority, stm32_dmaisr_t func, void *param); void dmaStreamRelease(const stm32_dma_stream_t *dmastp); #ifdef __cplusplus } #endif #endif /* _STM32_DMA_H_ */ /** @} */