/**
* @brief Resets the MPU6000 FIFO from an ISR
* @param woken[in,out] If non-NULL, will be set to true if woken was false and a higher priority
* task has is now eligible to run, else unchanged
* @return 0 if operation was successful
* @return -1 if unable to claim SPI bus
* @return -2 if write to the device failed
*/
static int32_t PIOS_MPU6000_ResetFifoISR(bool *woken)
{
int32_t result = 0;
/* Register writes must be at < 1MHz SPI clock.
* Speed can only be changed when SPI bus semaphore is held, but
* device chip select must not be enabled, so we use the direct
* SPI bus claim call here */
if (PIOS_SPI_ClaimBusISR(dev->spi_id, woken) != 0) {
return -1;
}
/* Reduce SPI clock speed. */
PIOS_SPI_SetClockSpeed(dev->spi_id, PIOS_SPI_PRESCALER_256);
/* Enable chip select */
PIOS_SPI_RC_PinSet(dev->spi_id, dev->slave_num, 0);
/* Reset FIFO. */
if (PIOS_SPI_TransferByte(dev->spi_id, 0x7f & PIOS_MPU6000_USER_CTRL_REG) != 0) {
result = -2;
} else if (PIOS_SPI_TransferByte(dev->spi_id, (dev->cfg->User_ctl | PIOS_MPU6000_USERCTL_FIFO_RST)) != 0) {
result = -2;
}
/* Disable chip select. */
PIOS_SPI_RC_PinSet(dev->spi_id, dev->slave_num, 1);
/* Increase SPI clock speed. */
PIOS_SPI_SetClockSpeed(dev->spi_id, PIOS_SPI_PRESCALER_16);
/* Release the SPI bus semaphore. */
PIOS_SPI_ReleaseBusISR(dev->spi_id, woken);
return result;
}
/**
* @brief Release the SPI bus for the accel communications and end the transaction
* @return 0 if successful
* @param woken[in,out] If non-NULL, will be set to true if woken was false and a higher priority
* task has is now eligible to run, else unchanged
*/
static int32_t PIOS_MPU6000_ReleaseBusISR(bool *woken)
{
if (PIOS_MPU6000_Validate(dev) != 0) {
return -1;
}
PIOS_SPI_RC_PinSet(dev->spi_id, dev->slave_num, 1);
return PIOS_SPI_ReleaseBusISR(dev->spi_id, woken);
}
/**
* @brief Release the SPI bus for the accel communications and end the transaction
* \param[in] pointer which receives if a task has been woken
* @return 0 if successful
*/
int32_t PIOS_BMA180_ReleaseBusISR(bool *woken)
{
if(PIOS_BMA180_Validate(dev) != 0)
return -1;
PIOS_SPI_RC_PinSet(dev->spi_id,dev->slave_num,1);
return PIOS_SPI_ReleaseBusISR(dev->spi_id, woken);
}
/**
* @brief Release the SPI bus for the accel communications and end the transaction
* \param[in] pointer which receives if a task has been woken
* @return 0 if successful, -1 for invalid device
*/
static int32_t PIOS_L3GD20_ReleaseBusIsr(bool *woken)
{
if (PIOS_L3GD20_Validate(pios_l3gd20_dev) != 0)
return -1;
PIOS_SPI_RC_PinSet(pios_l3gd20_dev->spi_id, pios_l3gd20_dev->slave_num, 1);
return PIOS_SPI_ReleaseBusISR(pios_l3gd20_dev->spi_id, woken);
}
