/*! \brief Deselect a device on the SPI bus.
*
* Deactivates the chip select and unlocks the bus.
*
* \param node Specifies the SPI bus node.
*
* \return Always 0.
*/
static int Stm32SpiBusDeselect(NUTSPINODE * node)
{
/* Sanity check. */
NUTASSERT(node != NULL);
NUTASSERT(node->node_bus != NULL);
NutSpiBusWait(node, NUT_WAIT_INFINITE);
/* Deactivate the node's chip select. */
Stm32SpiChipSelect(node->node_cs, (node->node_mode & SPI_MODE_CSHIGH) == 0);
/* Release the bus. */
NutEventPostAsync(&node->node_bus->bus_mutex);
return 0;
}
/*!
* \brief Load sector.
*
* \param dev Specifies the file system device.
* \param sect Sector to load.
*
* \return 0 on success, -1 on failures.
*/
static int RawFsSectorLoad(NUTDEVICE * dev, uint32_t sect)
{
int rc = -1;
RAWVOLUME *vol;
NUTASSERT(dev != NULL);
vol = (RAWVOLUME *) dev->dev_dcb;
/* Gain mutex access. */
NUTASSERT(vol != NULL);
NutEventWait(&vol->vol_iomutex, 0);
/* Nothing to do if sector is already loaded. */
if (vol->vol_sect_num == sect) {
rc = 0;
}
/* Make sure that the sector buffer is clean. */
else if (RawFsSectorFlush(dev) == 0) {
NUTFILE *blkmnt = dev->dev_icb;
NUTDEVICE *blkdev = blkmnt->nf_dev;
BLKPAR_SEEK pars;
blkmnt = dev->dev_icb;
NUTASSERT(blkmnt != NULL);
blkdev = blkmnt->nf_dev;
NUTASSERT(blkdev != NULL);
/* Set the block device's sector position. */
pars.par_nfp = blkmnt;
pars.par_blknum = sect;
if ((*blkdev->dev_ioctl) (blkdev, NUTBLKDEV_SEEK, &pars) == 0) {
/* Read a single block from the device. */
if ((*blkdev->dev_read) (blkmnt, vol->vol_sect_buf, 1) == 1) {
vol->vol_sect_num = sect;
rc = 0;
}
}
}
/* Release mutex access. */
NutEventPostAsync(&vol->vol_iomutex);
return rc;
}
/*
* Timer callback function.
*
* Timer callbacks are called during context switch processing. They must
* return as soon as possible and must not call any potentially blocking
* function.
*
* It would be great to be able to start a thread here, but unfortunately
* this doesn't work in Nut/OS. :-(
*/
static void TimerCallback(HANDLE timer, void *arg)
{
NutEventPostAsync(arg);
}