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bsp/atsam: Avoid to power on/off the SPI module

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This commit is contained in:
Sebastian Huber
2016-12-13 15:49:09 +01:00
parent f74e2959de
commit 5dd02e9569
2 changed files with 9 additions and 22 deletions
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2
c/src/lib/libbsp/arm/atsam/include/atsam-spi.h
View File

@@ -44,7 +44,7 @@ typedef struct {
uint32_t dma_rx_channel;
bool rx_transfer_done;
bool tx_transfer_done;
bool spi_switched_on;
bool chip_select_active;
} atsam_spi_bus;
int spi_bus_register_atsam(

29
c/src/lib/libbsp/arm/atsam/spi/atsam_spi_bus.c
View File

@@ -34,15 +34,6 @@
#define MAX_SPI_FREQUENCY 50000000
static void atsam_finish_command(Spid *SpiDma)
{
Spi *pSpiHw = SpiDma->pSpiHw;
SPI_Disable(pSpiHw);
PMC_DisablePeripheral(SpiDma->spiId);
}
static void atsam_interrupt_handler(void *arg)
{
atsam_spi_bus *bus = (atsam_spi_bus *)arg;
@@ -369,19 +360,13 @@ static uint32_t atsam_send_command(
return SPID_ERROR_LOCK;
}
if(!bus->spi_switched_on){
/* Enable the SPI Peripheral */
PMC_EnablePeripheral(spid->spiId);
if (!bus->chip_select_active){
bus->chip_select_active = true;
/* SPI chip select */
SPI_ChipSelect(pSpiHw, 1 << msg->cs);
/* Enables the SPI to transfer and receive data. */
SPI_Enable (pSpiHw);
SPI_Enable(pSpiHw);
}
bus->spi_switched_on = true;
/* Start DMA */
XDMAC_StartTransfer(pXdmac, bus->dma_rx_channel);
XDMAC_StartTransfer(pXdmac, bus->dma_tx_channel);
@@ -443,9 +428,9 @@ static int atsam_spi_setup_transfer(atsam_spi_bus *bus)
bus->tx_transfer_done = false;
if (msgs[i].cs_change > 0) {
bus->chip_select_active = false;
SPI_ReleaseCS(bus->SpiDma.pSpiHw);
atsam_finish_command(&bus->SpiDma);
bus->spi_switched_on = false;
SPI_Disable(bus->SpiDma.pSpiHw);
}
}
@@ -487,6 +472,9 @@ static void atsam_spi_destroy(spi_bus *base)
sc = rtems_interrupt_handler_remove(bus->irq, atsam_spi_interrupt, bus);
assert(sc == RTEMS_SUCCESSFUL);
SPI_Disable(bus->SpiDma.pSpiHw);
PMC_DisablePeripheral(bus->SpiDma.spiId);
spi_bus_destroy_and_free(&bus->base);
}
@@ -521,7 +509,6 @@ static void atsam_spi_init(
bus->base.cs = 1;
atsam_configure_spi(bus);
atsam_set_dmac(bus);
}