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STM32F7 DMA per SPI
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@dagar
dagar committed Oct 18, 2018
1 parent 166d898 commit c808528
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Showing 2 changed files with 127 additions and 20 deletions.
66 changes: 66 additions & 0 deletions arch/arm/src/stm32f7/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1709,6 +1709,72 @@ config STM32F7_SPI_DMA
default n
---help---
Use DMA to improve SPI transfer performance. Cannot be used with STM32F7_SPI_INTERRUPT.

if STM32F7_SPI1

config STM32F7_SPI1_DMA
bool "SPI1 DMA"
default n
depends on STM32F7_SPI_DMA
---help---
Use DMA to improve SPI1 transfer performance.

endif # STM32F7_SPI1

if STM32F7_SPI2

config STM32F7_SPI2_DMA
bool "SPI2 DMA"
default n
depends on STM32F7_SPI_DMA
---help---
Use DMA to improve SPI2 transfer performance.

endif # STM32F7_SPI2

if STM32F7_SPI3

config STM32F7_SPI3_DMA
bool "SPI3 DMA"
default n
depends on STM32F7_SPI_DMA
---help---
Use DMA to improve SPI3 transfer performance.

endif # STM32F7_SPI2

if STM32F7_SPI4

config STM32F7_SPI4_DMA
bool "SPI4 DMA"
default n
depends on STM32F7_SPI_DMA
---help---
Use DMA to improve SPI4 transfer performance.

endif # STM32F7_SPI4

if STM32F7_SPI5

config STM32F7_SPI5_DMA
bool "SPI5 DMA"
default n
depends on STM32F7_SPI_DMA
---help---
Use DMA to improve SPI5 transfer performance.

endif # STM32F7_SPI5

if STM32F7_SPI6

config STM32F7_SPI6_DMA
bool "SPI6 DMA"
default n
depends on STM32F7_SPI_DMA
---help---
Use DMA to improve SPI6 transfer performance.

endif # STM32F7_SPI6

endmenu # "SPI Configuration"

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81 changes: 61 additions & 20 deletions arch/arm/src/stm32f7/stm32_spi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -263,8 +263,13 @@ static struct stm32_spidev_s g_spi1dev =
.spiirq = STM32_IRQ_SPI1,
#endif
#ifdef CONFIG_STM32F7_SPI_DMA
# ifdef CONFIG_STM32F7_SPI1_DMA
.rxch = DMAMAP_SPI1_RX,
.txch = DMAMAP_SPI1_TX,
# else
.rxch = 0,
.txch = 0,
# endif
#endif
};
#endif
Expand Down Expand Up @@ -307,8 +312,13 @@ static struct stm32_spidev_s g_spi2dev =
.spiirq = STM32_IRQ_SPI2,
#endif
#ifdef CONFIG_STM32F7_SPI_DMA
# ifdef CONFIG_STM32F7_SPI2_DMA
.rxch = DMAMAP_SPI2_RX,
.txch = DMAMAP_SPI2_TX,
# else
.rxch = 0,
.txch = 0,
# endif
#endif
};
#endif
Expand Down Expand Up @@ -351,8 +361,13 @@ static struct stm32_spidev_s g_spi3dev =
.spiirq = STM32_IRQ_SPI3,
#endif
#ifdef CONFIG_STM32F7_SPI_DMA
# ifdef CONFIG_STM32F7_SPI3_DMA
.rxch = DMAMAP_SPI3_RX,
.txch = DMAMAP_SPI3_TX,
# else
.rxch = 0,
.txch = 0,
# endif
#endif
};
#endif
Expand Down Expand Up @@ -395,8 +410,13 @@ static struct stm32_spidev_s g_spi4dev =
.spiirq = STM32_IRQ_SPI4,
#endif
#ifdef CONFIG_STM32F7_SPI_DMA
# ifdef CONFIG_STM32F7_SPI4_DMA
.rxch = DMAMAP_SPI4_RX,
.txch = DMAMAP_SPI4_TX,
# else
.rxch = 0,
.txch = 0,
# endif
#endif
};
#endif
Expand Down Expand Up @@ -439,8 +459,13 @@ static struct stm32_spidev_s g_spi5dev =
.spiirq = STM32_IRQ_SPI5,
#endif
#ifdef CONFIG_STM32F7_SPI_DMA
# ifdef CONFIG_STM32F7_SPI5_DMA
.rxch = DMAMAP_SPI5_RX,
.txch = DMAMAP_SPI5_TX,
# else
.rxch = 0,
.txch = 0,
# endif
#endif
};
#endif
Expand All @@ -458,7 +483,7 @@ static const struct spi_ops_s g_sp6iops =
#endif
.status = stm32_spi6status,
#ifdef CONFIG_SPI_CMDDATA
.cmddata = stm32_spi3cmddata,
.cmddata = stm32_spi6cmddata,
#endif
.send = spi_send,
#ifdef CONFIG_SPI_EXCHANGE
Expand All @@ -483,8 +508,13 @@ static struct stm32_spidev_s g_spi6dev =
.spiirq = STM32_IRQ_SPI6,
#endif
#ifdef CONFIG_STM32F7_SPI_DMA
# ifdef CONFIG_STM32F7_SPI6_DMA
.rxch = DMAMAP_SPI6_RX,
.txch = DMAMAP_SPI6_TX,
# else
.rxch = 0,
.txch = 0,
# endif
#endif
};
#endif
Expand Down Expand Up @@ -1530,10 +1560,12 @@ static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
DEBUGASSERT(priv != NULL);

#ifdef CONFIG_STM32F7_DMACAPABLE
if ((txbuffer && !stm32_dmacapable((uint32_t)txbuffer, nwords, priv->txccr)) ||
(rxbuffer && !stm32_dmacapable((uint32_t)rxbuffer, nwords, priv->rxccr)))
if ((priv->rxdma == NULL) || (priv->txdma == NULL) ||
(txbuffer && !stm32_dmacapable((uint32_t)txbuffer, nwords, priv->txccr)) ||
(rxbuffer && !stm32_dmacapable((uint32_t)rxbuffer, nwords, priv->rxccr)) ||
up_interrupt_context())
{
/* Unsupported memory region, fall back to non-DMA method. */
/* Invalid DMA channels, unsupported memory region, or interrupt context, fall back to non-DMA method. */

spi_exchange_nodma(dev, txbuffer, rxbuffer, nwords);
}
Expand Down Expand Up @@ -1704,25 +1736,34 @@ static void spi_bus_initialize(FAR struct stm32_spidev_s *priv)
* priority inheritance enabled.
*/

sem_init(&priv->rxsem, 0, 0);
sem_init(&priv->txsem, 0, 0);

sem_setprotocol(&priv->rxsem, SEM_PRIO_NONE);
sem_setprotocol(&priv->txsem, SEM_PRIO_NONE);
if (priv->rxch && priv->txch)
{
sem_init(&priv->rxsem, 0, 0);
sem_init(&priv->txsem, 0, 0);

sem_setprotocol(&priv->rxsem, SEM_PRIO_NONE);
sem_setprotocol(&priv->txsem, SEM_PRIO_NONE);

/* Get DMA channels. NOTE: stm32_dmachannel() will always assign the DMA channel.
* if the channel is not available, then stm32_dmachannel() will block and wait
* until the channel becomes available. WARNING: If you have another device sharing
* a DMA channel with SPI and the code never releases that channel, then the call
* to stm32_dmachannel() will hang forever in this function! Don't let your
* design do that!
*/

/* Get DMA channels. NOTE: stm32_dmachannel() will always assign the DMA channel.
* if the channel is not available, then stm32_dmachannel() will block and wait
* until the channel becomes available. WARNING: If you have another device sharing
* a DMA channel with SPI and the code never releases that channel, then the call
* to stm32_dmachannel() will hang forever in this function! Don't let your
* design do that!
*/
priv->rxdma = stm32_dmachannel(priv->rxch);
priv->txdma = stm32_dmachannel(priv->txch);
DEBUGASSERT(priv->rxdma && priv->txdma);

priv->rxdma = stm32_dmachannel(priv->rxch);
priv->txdma = stm32_dmachannel(priv->txch);
DEBUGASSERT(priv->rxdma && priv->txdma);
spi_modifycr2(priv, SPI_CR2_RXDMAEN | SPI_CR2_TXDMAEN, 0);

spi_modifycr2(priv, SPI_CR2_RXDMAEN | SPI_CR2_TXDMAEN, 0);
}
else
{
priv->rxdma = NULL;
priv->txdma = NULL;
}
#endif

/* Enable spi */
Expand Down

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