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A little more SPI DMA support (still incomplete)

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2146 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-10-16 20:51:36 +00:00
parent 54432b6812
commit 19f1028342
3 changed files with 206 additions and 38 deletions
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12
arch/arm/src/stm32/stm32_dma.c
View File

@ -81,6 +81,7 @@ struct stm32_dma_s
sem_t sem; /* Used to wait for DMA channel to become available */
uint32 base; /* DMA register channel base address */
dma_callback_t callback; /* Callback invoked when the DMA completes */
void *arg; /* Argument passed to callback function */
};
/****************************************************************************
@ -263,7 +264,7 @@ static int stm32_dmainterrupt(int irq, void *context)
if (dmach->callback)
{
dmach->callback(dmach, isr >> DMA_ISR_CHAN_SHIFT(chan));
dmach->callback(dmach, isr >> DMA_ISR_CHAN_SHIFT(chan), dmach->arg);
}
return OK;
}
@ -403,9 +404,13 @@ void stm32_dmasetup(DMA_HANDLE handle, uint32 paddr, uint32 maddr, size_t ntrans
* Description:
* Start the DMA transfer
*
* Assumptions:
* - DMA handle allocated by stm32_dmachannel()
* - No DMA in progress
*
****************************************************************************/
void stm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, boolean half)
void stm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg, boolean half)
{
struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle;
int irq;
@ -413,9 +418,10 @@ void stm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, boolean half)
DEBUGASSERT(handle != NULL);
/* Save the callback. This will be invoked whent the DMA commpletes */
/* Save the callback info. This will be invoked whent the DMA commpletes */
dmach->callback = callback;
dmach->arg = arg;
/* Activate the channel by setting the ENABLE bit in the DMA_CCRx register.
* As soon as the channel is enabled, it can serve any DMA request from the

9
arch/arm/src/stm32/stm32_internal.h
View File

@ -380,7 +380,7 @@
************************************************************************************/
typedef FAR void *DMA_HANDLE;
typedef void (*dma_callback_t)(DMA_HANDLE handle, ubyte isr);
typedef void (*dma_callback_t)(DMA_HANDLE handle, ubyte isr, void *arg);
/************************************************************************************
* Inline Functions
@ -533,9 +533,14 @@ EXTERN void stm32_dmasetup(DMA_HANDLE handle, uint32 paddr, uint32 maddr,
* Description:
* Start the DMA transfer
*
* Assumptions:
* - DMA handle allocated by stm32_dmachannel()
* - No DMA in progress
*
****************************************************************************/
EXTERN void stm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, boolean half);
EXTERN void stm32_dmastart(DMA_HANDLE handle, dma_callback_t callback,
void *arg, boolean half);
/************************************************************************************
* Function: stm32_ethinitialize

223
arch/arm/src/stm32/stm32_spi.c
View File

@ -113,12 +113,14 @@ struct stm32_spidev_s
ubyte spiirq; /* SPI IRQ number */
#endif
#ifdef CONFIG_STM32_SPI_DMA
volatile ubyte result; /* Result of the DMA */
ubyte rxch; /* The RX DMA channel number */
ubyte txch; /* The TX DMA channel number */
DMA_HANDLE rxdma; /* DMA channel handle for RX transfers */
DMA_HANDLE txdma; /* DMA channel handle for TX transfers */
sem_t dmasem; /* Wait for DMA to complete */
#endif
sem_t spisem;
sem_t exclsem; /* Held while chip is selected for mutual exclusion */
};
/************************************************************************************
@ -133,6 +135,20 @@ static inline void spi_putreg(FAR struct stm32_spidev_s *priv, ubyte offset,
static inline uint16 spi_readword(FAR struct stm32_spidev_s *priv);
static inline void spi_writeword(FAR struct stm32_spidev_s *priv, uint16 byte);
/* DMA support */
#ifdef CONFIG_STM32_SPI_DMA
static void spi_dmawait(FAR struct stm32_spidev_s *priv);
static inline void spi_dmawakeup(FAR struct stm32_spidev_s *priv);
static void spi_dmacallback(DMA_HANDLE handle, ubyte isr, void *arg);
static void spi_dmaexchange(FAR struct stm32_spidev_s *priv,
FAR const void *txbuffer, FAR void *rxbuffer,
size_t nwords);
static void spi_dmasend(FAR struct stm32_spidev_s *priv,
FAR const void *txbuffer, size_t nwords);
static void spi_dmarecv(FAR struct stm32_spidev_s *priv,
FAR void *rxbuffer, size_t nwords);
#endif
/* SPI methods */
@ -143,9 +159,9 @@ static uint16 spi_send(FAR struct spi_dev_s *dev, uint16 wd);
static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
FAR void *rxbuffer, size_t nwords);
#ifndef CONFIG_SPI_EXCHANGE
static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *buffer,
static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
size_t nwords);
static void spi_recvblock(FAR struct spi_dev_s *dev, FAR void *buffer,
static void spi_recvblock(FAR struct spi_dev_s *dev, FAR void *rxbuffer,
size_t nwords);
#endif
@ -356,6 +372,143 @@ static inline void spi_writeword(FAR struct stm32_spidev_s *priv, uint16 word)
spi_putreg(priv, STM32_SPI_DR_OFFSET, word);
}
/************************************************************************************
* Name: spi_dmawait
*
* Description:
* Wait for DMA to complete.
*
************************************************************************************/
#ifdef CONFIG_STM32_SPI_DMA
static void spi_dmawait(FAR struct stm32_spidev_s *priv)
{
/* Take the semaphore (perhaps waiting). If the result is zero, then the DMA
* must not really have completed???
*/
while (sem_wait(&priv->dmasem) != 0 && priv->result == 0)
{
/* The only case that an error should occur here is if the wait was awakened
* by a signal.
*/
ASSERT(errno == EINTR);
}
}
#endif
/************************************************************************************
* Name: spi_dmawakeup
*
* Description:
* Signal that DMA is complete
*
************************************************************************************/
#ifdef CONFIG_STM32_SPI_DMA
static inline void spi_dmawakeup(FAR struct stm32_spidev_s *priv)
{
(void)sem_post(&priv->dmasem);
}
#endif
/************************************************************************************
* Name: spi_dmacallback
*
* Description:
* Called when the DMA complets
*
************************************************************************************/
#ifdef CONFIG_STM32_SPI_DMA
static void spi_dmacallback(DMA_HANDLE handle, ubyte isr, void *arg)
{
FAR struct stm32_spidev_s *priv = (FAR struct stm32_spidev_s *)arg;
priv->result = isr | 0x080; /* OR'ed with 0x80 to assure non-zero */
spi_dmawakeup(priv);
}
#endif
/************************************************************************************
* Name: spi_dmaexchange
*
* Description:
* Perform concurrent RX and TX DMA transfers
*
* priv - Device-specific state data
* txbuffer - A pointer to the buffer of data to be sent
* rxbuffer - A pointer to a buffer in which to receive data
* nwords - the length of data to be exchaned in units of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
*
* Returned Value:
* None
*
************************************************************************************/
#ifdef CONFIG_STM32_SPI_DMA
static void spi_dmaexchange(FAR struct stm32_spidev_s *priv, FAR const void *txbuffer,
FAR void *rxbuffer, size_t nwords)
{
# error "To be provided"
}
#endif
/************************************************************************************
* Name: spi_dmasend
*
* Description:
* Perform TX only DMA transfer
*
* priv - Device-specific state data
* txbuffer - A pointer to the buffer of data to be sent
* nwords - the length of data to be exchaned in units of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
*
* Returned Value:
* None
*
************************************************************************************/
#ifdef CONFIG_STM32_SPI_DMA
static void spi_dmasend(FAR struct stm32_spidev_s *priv, FAR const void *txbuffer,
size_t nwords)
{
# error "To be provided"
}
#endif
/************************************************************************************
* Name: spi_dmarecv
*
* Description:
* Perform RX only DMA transfer
*
* priv - Device-specific state data
* rxbuffer - A pointer to a buffer in which to receive data
* nwords - the length of data to be exchaned in units of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
*
* Returned Value:
* None
*
************************************************************************************/
#ifdef CONFIG_STM32_SPI_DMA
static void spi_dmarecv(FAR struct stm32_spidev_s *priv, FAR void *rxbuffer,
size_t nwords)
{
# error "To be provided"
}
#endif
/************************************************************************************
* Name: spi_modifycr1
*
@ -588,13 +741,13 @@ static uint16 spi_send(FAR struct spi_dev_s *dev, uint16 wd)
* Exchange a block of data on SPI
*
* Input Parameters:
* dev - Device-specific state data
* dev - Device-specific state data
* txbuffer - A pointer to the buffer of data to be sent
* txbuffer - A pointer to a buffer in which to receive data
* nwords - the length of data to be exchaned in units of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
* rxbuffer - A pointer to a buffer in which to receive data
* nwords - the length of data to be exchaned in units of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
*
* Returned Value:
* None
@ -680,12 +833,12 @@ static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
* Send a block of data on SPI
*
* Input Parameters:
* dev - Device-specific state data
* buffer - A pointer to the buffer of data to be sent
* nwords - the length of data to send from the buffer in number of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
* dev - Device-specific state data
* txbuffer - A pointer to the buffer of data to be sent
* nwords - the length of data to send from the buffer in number of words.
* The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
*
* Returned Value:
* None
@ -693,9 +846,9 @@ static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
************************************************************************************/
#ifndef CONFIG_SPI_EXCHANGE
static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *buffer, size_t nwords)
static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *txbuffer, size_t nwords)
{
return spi_exchange(dev, buffer, NULL, nwords);
return spi_exchange(dev, txbuffer, NULL, nwords);
}
#endif
@ -706,12 +859,12 @@ static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *buffer, size
* Revice a block of data from SPI
*
* Input Parameters:
* dev - Device-specific state data
* buffer - A pointer to the buffer in which to recieve data
* nwords - the length of data that can be received in the buffer in number
* of words. The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
* dev - Device-specific state data
* rxbuffer - A pointer to the buffer in which to recieve data
* nwords - the length of data that can be received in the buffer in number
* of words. The wordsize is determined by the number of bits-per-word
* selected for the SPI interface. If nbits <= 8, the data is
* packed into ubytes; if nbits >8, the data is packed into uint16's
*
* Returned Value:
* None
@ -719,9 +872,9 @@ static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *buffer, size
************************************************************************************/
#ifndef CONFIG_SPI_EXCHANGE
static void spi_recvblock(FAR struct spi_dev_s *dev, FAR void *buffer, size_t nwords)
static void spi_recvblock(FAR struct spi_dev_s *dev, FAR void *rxbuffer, size_t nwords)
{
return spi_exchange(dev, NULL, buffer, nwords);
return spi_exchange(dev, NULL, rxbuffer, nwords);
}
#endif
@ -768,15 +921,19 @@ static void spi_portinitialize(FAR struct stm32_spidev_s *priv)
/* Enable the SPI semaphore that enforces mutually exclusive access */
sem_init(&priv->spisem, 0, 1);
sem_init(&priv->exclsem, 0, 1);
/* Get DMA channels. Note that if we fail to get a DMA channel, we will fall
* back to dumb I/O.
*/
/* Enable the SPI semaphore that is used to wait for DMA completion */
#ifdef CONFIG_STM32_SPI_DMA
priv->rxdma = dma_dmachannel(priv->rxch);
priv->txdma = dma_dmachannel(priv->txch);
sem_init(&priv->exclsem, 0, 0);
/* Get DMA channels. Note that if we fail to get a DMA channel, we will just
* fall back to dumb I/O.
*/
priv->rxdma = stm32_dmachannel(priv->rxch);
priv->txdma = stm32_dmachannel(priv->txch);
#endif
/* Enable spi */
@ -898,7 +1055,7 @@ void stm32_spitake(FAR struct spi_dev_s *dev)
/* Take the semaphore (perhaps waiting) */
while (sem_wait(&priv->spisem) != 0)
while (sem_wait(&priv->exclsem) != 0)
{
/* The only case that an error should occur here is if the wait was awakened
* by a signal.
@ -911,7 +1068,7 @@ void stm32_spitake(FAR struct spi_dev_s *dev)
void stm32_spigive(FAR struct spi_dev_s *dev)
{
FAR struct stm32_spidev_s *priv = (FAR struct stm32_spidev_s *)dev;
(void)sem_post(&priv->spisem);
(void)sem_post(&priv->exclsem);
}
#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 || CONFIG_STM32_SPI3 */