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LibrePilot/flight/pios/common/pios_mpu6000.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_MPU6000 MPU6000 Functions
* @brief Deals with the hardware interface to the 3-axis gyro
* @{
*
* @file pios_mpu000.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
* @brief MPU6000 6-axis gyro and accel chip
* @see The GNU Public License (GPL) Version 3
*
******************************************************************************
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pios.h"
#ifdef PIOS_INCLUDE_MPU6000
#include <pios_constants.h>
/* Global Variables */
enum pios_mpu6000_dev_magic {
PIOS_MPU6000_DEV_MAGIC = 0x9da9b3ed,
};
struct mpu6000_dev {
uint32_t spi_id;
uint32_t slave_num;
xQueueHandle queue;
const struct pios_mpu6000_cfg *cfg;
enum pios_mpu6000_range gyro_range;
enum pios_mpu6000_accel_range accel_range;
enum pios_mpu6000_filter filter;
enum pios_mpu6000_dev_magic magic;
};
#ifdef PIOS_MPU6000_ACCEL
#define PIOS_MPU6000_SAMPLES_BYTES 14
#define PIOS_MPU6000_SENSOR_FIRST_REG PIOS_MPU6000_ACCEL_X_OUT_MSB
#else
#define PIOS_MPU6000_SENSOR_FIRST_REG PIOS_MPU6000_TEMP_OUT_MSB
#define PIOS_MPU6000_SAMPLES_BYTES 8
#endif
typedef union {
uint8_t buffer[1 + PIOS_MPU6000_SAMPLES_BYTES];
struct {
uint8_t dummy;
#ifdef PIOS_MPU6000_ACCEL
uint8_t Accel_X_h;
uint8_t Accel_X_l;
uint8_t Accel_Y_h;
uint8_t Accel_Y_l;
uint8_t Accel_Z_h;
uint8_t Accel_Z_l;
#endif
uint8_t Temperature_h;
uint8_t Temperature_l;
uint8_t Gyro_X_h;
uint8_t Gyro_X_l;
uint8_t Gyro_Y_h;
uint8_t Gyro_Y_l;
uint8_t Gyro_Z_h;
uint8_t Gyro_Z_l;
} data;
} mpu6000_data_t;
#define GET_SENSOR_DATA(mpudataptr, sensor) (mpudataptr.data.sensor##_h << 8 | mpudataptr.data.sensor##_l)
// ! Global structure for this device device
static struct mpu6000_dev *dev;
volatile bool mpu6000_configured = false;
static mpu6000_data_t mpu6000_data;
// ! Private functions
static struct mpu6000_dev *PIOS_MPU6000_alloc(const struct pios_mpu6000_cfg *cfg);
static int32_t PIOS_MPU6000_Validate(struct mpu6000_dev *dev);
static void PIOS_MPU6000_Config(struct pios_mpu6000_cfg const *cfg);
static int32_t PIOS_MPU6000_SetReg(uint8_t address, uint8_t buffer);
static int32_t PIOS_MPU6000_GetReg(uint8_t address);
static void PIOS_MPU6000_SetSpeed(const bool fast);
static bool PIOS_MPU6000_HandleData();
static bool PIOS_MPU6000_ReadFifo(bool *woken);
static bool PIOS_MPU6000_ReadSensor(bool *woken);
/**
* @brief Allocate a new device
*/
static struct mpu6000_dev *PIOS_MPU6000_alloc(const struct pios_mpu6000_cfg *cfg)
{
struct mpu6000_dev *mpu6000_dev;
mpu6000_dev = (struct mpu6000_dev *)pios_malloc(sizeof(*mpu6000_dev));
if (!mpu6000_dev) {
return NULL;
}
mpu6000_dev->magic = PIOS_MPU6000_DEV_MAGIC;
mpu6000_dev->queue = xQueueCreate(cfg->max_downsample + 1, sizeof(struct pios_mpu6000_data));
if (mpu6000_dev->queue == NULL) {
vPortFree(mpu6000_dev);
return NULL;
}
return mpu6000_dev;
}
/**
* @brief Validate the handle to the spi device
* @returns 0 for valid device or -1 otherwise
*/
static int32_t PIOS_MPU6000_Validate(struct mpu6000_dev *vdev)
{
if (vdev == NULL) {
return -1;
}
if (vdev->magic != PIOS_MPU6000_DEV_MAGIC) {
return -2;
}
if (vdev->spi_id == 0) {
return -3;
}
return 0;
}
/**
* @brief Initialize the MPU6000 3-axis gyro sensor.
* @return 0 for success, -1 for failure
*/
int32_t PIOS_MPU6000_Init(uint32_t spi_id, uint32_t slave_num, const struct pios_mpu6000_cfg *cfg)
{
dev = PIOS_MPU6000_alloc(cfg);
if (dev == NULL) {
return -1;
}
dev->spi_id = spi_id;
dev->slave_num = slave_num;
dev->cfg = cfg;
/* Configure the MPU6000 Sensor */
PIOS_MPU6000_Config(cfg);
/* Set up EXTI line */
PIOS_EXTI_Init(cfg->exti_cfg);
return 0;
}
/**
* @brief Initialize the MPU6000 3-axis gyro sensor
* \return none
* \param[in] PIOS_MPU6000_ConfigTypeDef struct to be used to configure sensor.
*
*/
static void PIOS_MPU6000_Config(struct pios_mpu6000_cfg const *cfg)
{
PIOS_MPU6000_Test();
// Reset chip
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_PWR_MGMT_REG, PIOS_MPU6000_PWRMGMT_IMU_RST) != 0) {
;
}
PIOS_DELAY_WaitmS(50);
// Reset chip and fifo
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_USER_CTRL_REG,
PIOS_MPU6000_USERCTL_GYRO_RST |
PIOS_MPU6000_USERCTL_SIG_COND |
PIOS_MPU6000_USERCTL_FIFO_RST) != 0) {
;
}
// Wait for reset to finish
while (PIOS_MPU6000_GetReg(PIOS_MPU6000_USER_CTRL_REG) &
(PIOS_MPU6000_USERCTL_GYRO_RST |
PIOS_MPU6000_USERCTL_SIG_COND |
PIOS_MPU6000_USERCTL_FIFO_RST)) {
;
}
PIOS_DELAY_WaitmS(10);
// Power management configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_PWR_MGMT_REG, cfg->Pwr_mgmt_clk) != 0) {
;
}
// Interrupt configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_INT_CFG_REG, cfg->interrupt_cfg) != 0) {
;
}
// Interrupt configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_INT_EN_REG, cfg->interrupt_en) != 0) {
;
}
// FIFO storage
#if defined(PIOS_MPU6000_ACCEL)
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_FIFO_EN_REG, cfg->Fifo_store | PIOS_MPU6000_ACCEL_OUT) != 0) {
;
}
#else
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_FIFO_EN_REG, cfg->Fifo_store) != 0) {
;
}
#endif
PIOS_MPU6000_ConfigureRanges(cfg->gyro_range, cfg->accel_range, cfg->filter);
// Interrupt configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_USER_CTRL_REG, cfg->User_ctl) != 0) {
;
}
// Interrupt configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_PWR_MGMT_REG, cfg->Pwr_mgmt_clk) != 0) {
;
}
// Interrupt configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_INT_CFG_REG, cfg->interrupt_cfg) != 0) {
;
}
// Interrupt configuration
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_INT_EN_REG, cfg->interrupt_en) != 0) {
;
}
if ((PIOS_MPU6000_GetReg(PIOS_MPU6000_INT_EN_REG)) != cfg->interrupt_en) {
return;
}
mpu6000_configured = true;
}
/**
* @brief Configures Gyro, accel and Filter ranges/setings
* @return 0 if successful, -1 if device has not been initialized
*/
int32_t PIOS_MPU6000_ConfigureRanges(
enum pios_mpu6000_range gyroRange,
enum pios_mpu6000_accel_range accelRange,
enum pios_mpu6000_filter filterSetting)
{
if (dev == NULL) {
return -1;
}
// update filter settings
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_DLPF_CFG_REG, filterSetting) != 0) {
;
}
// Sample rate divider, chosen upon digital filtering settings
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_SMPLRT_DIV_REG,
filterSetting == PIOS_MPU6000_LOWPASS_256_HZ ?
dev->cfg->Smpl_rate_div_no_dlp : dev->cfg->Smpl_rate_div_dlp) != 0) {
;
}
dev->filter = filterSetting;
// Gyro range
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_GYRO_CFG_REG, gyroRange) != 0) {
;
}
dev->gyro_range = gyroRange;
#if defined(PIOS_MPU6000_ACCEL)
// Set the accel range
while (PIOS_MPU6000_SetReg(PIOS_MPU6000_ACCEL_CFG_REG, accelRange) != 0) {
;
}
dev->accel_range = accelRange;
#endif
return 0;
}
/**
* @brief Claim the SPI bus for the accel communications and select this chip
* @return 0 if successful, -1 for invalid device, -2 if unable to claim bus
*/
static int32_t PIOS_MPU6000_ClaimBus(bool fast_spi)
{
if (PIOS_MPU6000_Validate(dev) != 0) {
return -1;
}
if (PIOS_SPI_ClaimBus(dev->spi_id) != 0) {
return -2;
}
PIOS_MPU6000_SetSpeed(fast_spi);
PIOS_SPI_RC_PinSet(dev->spi_id, dev->slave_num, 0);
return 0;
}
static void PIOS_MPU6000_SetSpeed(const bool fast)
{
if (fast) {
PIOS_SPI_SetClockSpeed(dev->spi_id, dev->cfg->fast_prescaler);
} else {
PIOS_SPI_SetClockSpeed(dev->spi_id, dev->cfg->std_prescaler);
}
}
/**
* @brief Claim the SPI bus for the accel communications and select this chip
* @return 0 if successful, -1 for invalid device, -2 if unable to claim bus
* @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_ClaimBusISR(bool *woken, bool fast_spi)
{
if (PIOS_MPU6000_Validate(dev) != 0) {
return -1;
}
if (PIOS_SPI_ClaimBusISR(dev->spi_id, woken) != 0) {
return -2;
}
PIOS_MPU6000_SetSpeed(fast_spi);
PIOS_SPI_RC_PinSet(dev->spi_id, dev->slave_num, 0);
return 0;
}
/**
* @brief Release the SPI bus for the accel communications and end the transaction
* @return 0 if successful
*/
static int32_t PIOS_MPU6000_ReleaseBus()
{
if (PIOS_MPU6000_Validate(dev) != 0) {
return -1;
}
PIOS_SPI_RC_PinSet(dev->spi_id, dev->slave_num, 1);
return PIOS_SPI_ReleaseBus(dev->spi_id);
}
/**
* @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 Read a register from MPU6000
* @returns The register value or -1 if failure to get bus
* @param reg[in] Register address to be read
*/
static int32_t PIOS_MPU6000_GetReg(uint8_t reg)
{
uint8_t data;
if (PIOS_MPU6000_ClaimBus(false) != 0) {
return -1;
}
PIOS_SPI_TransferByte(dev->spi_id, (0x80 | reg)); // request byte
data = PIOS_SPI_TransferByte(dev->spi_id, 0); // receive response
PIOS_MPU6000_ReleaseBus();
return data;
}
/**
* @brief Writes one byte to the MPU6000
* \param[in] reg Register address
* \param[in] data Byte to write
* \return 0 if operation was successful
* \return -1 if unable to claim SPI bus
* \return -2 if unable to claim i2c device
*/
static int32_t PIOS_MPU6000_SetReg(uint8_t reg, uint8_t data)
{
if (PIOS_MPU6000_ClaimBus(false) != 0) {
return -1;
}
if (PIOS_SPI_TransferByte(dev->spi_id, 0x7f & reg) != 0) {
PIOS_MPU6000_ReleaseBus();
return -2;
}
if (PIOS_SPI_TransferByte(dev->spi_id, data) != 0) {
PIOS_MPU6000_ReleaseBus();
return -3;
}
PIOS_MPU6000_ReleaseBus();
return 0;
}
/**
* @brief Read current X, Z, Y values (in that order)
* \param[out] int16_t array of size 3 to store X, Z, and Y magnetometer readings
2012-12-30 15:01:25 +01:00
* \returns 0 if succesful
*/
int32_t PIOS_MPU6000_ReadGyros(struct pios_mpu6000_data *data)
{
// THIS FUNCTION IS DEPRECATED AND DOES NOT PERFORM A ROTATION
uint8_t buf[7] = { PIOS_MPU6000_GYRO_X_OUT_MSB | 0x80, 0, 0, 0, 0, 0, 0 };
uint8_t rec[7];
if (PIOS_MPU6000_ClaimBus(true) != 0) {
return -1;
}
if (PIOS_SPI_TransferBlock(dev->spi_id, &buf[0], &rec[0], sizeof(buf), NULL) < 0) {
return -2;
}
PIOS_MPU6000_ReleaseBus();
data->gyro_x = rec[1] << 8 | rec[2];
data->gyro_y = rec[3] << 8 | rec[4];
data->gyro_z = rec[5] << 8 | rec[6];
return 0;
}
/*
* @brief Read the identification bytes from the MPU6000 sensor
* \return ID read from MPU6000 or -1 if failure
*/
int32_t PIOS_MPU6000_ReadID()
{
int32_t mpu6000_id = PIOS_MPU6000_GetReg(PIOS_MPU6000_WHOAMI);
if (mpu6000_id < 0) {
return -1;
}
return mpu6000_id;
}
/**
* \brief Reads the queue handle
* \return Handle to the queue or null if invalid device
*/
xQueueHandle PIOS_MPU6000_GetQueue()
{
if (PIOS_MPU6000_Validate(dev) != 0) {
return (xQueueHandle)NULL;
}
return dev->queue;
}
float PIOS_MPU6000_GetScale()
{
switch (dev->gyro_range) {
case PIOS_MPU6000_SCALE_250_DEG:
return 1.0f / 131.0f;
case PIOS_MPU6000_SCALE_500_DEG:
return 1.0f / 65.5f;
case PIOS_MPU6000_SCALE_1000_DEG:
return 1.0f / 32.8f;
case PIOS_MPU6000_SCALE_2000_DEG:
return 1.0f / 16.4f;
}
return 0;
}
float PIOS_MPU6000_GetAccelScale()
{
switch (dev->accel_range) {
case PIOS_MPU6000_ACCEL_2G:
return PIOS_CONST_MKS_GRAV_ACCEL_F / 16384.0f;
case PIOS_MPU6000_ACCEL_4G:
return PIOS_CONST_MKS_GRAV_ACCEL_F / 8192.0f;
case PIOS_MPU6000_ACCEL_8G:
return PIOS_CONST_MKS_GRAV_ACCEL_F / 4096.0f;
case PIOS_MPU6000_ACCEL_16G:
return PIOS_CONST_MKS_GRAV_ACCEL_F / 2048.0f;
}
return 0;
}
/**
* @brief Run self-test operation.
* \return 0 if test succeeded
* \return non-zero value if test succeeded
*/
int32_t PIOS_MPU6000_Test(void)
{
/* Verify that ID matches (MPU6000 ID is 0x69) */
int32_t mpu6000_id = PIOS_MPU6000_ReadID();
if (mpu6000_id < 0) {
return -1;
}
if (mpu6000_id != 0x68) {
return -2;
}
return 0;
}
/**
* @brief Reads the contents of the MPU6000 Interrupt Status register from an ISR
* @return The register value or -1 on failure to claim the bus
*/
static int32_t PIOS_MPU6000_GetInterruptStatusRegISR(bool *woken)
{
/* Interrupt Status register can be read at high SPI clock speed */
uint8_t data;
if (PIOS_MPU6000_ClaimBusISR(woken, false) != 0) {
return -1;
}
PIOS_SPI_TransferByte(dev->spi_id, (0x80 | PIOS_MPU6000_INT_STATUS_REG));
data = PIOS_SPI_TransferByte(dev->spi_id, 0);
PIOS_MPU6000_ReleaseBusISR(woken);
return data;
}
/**
* @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;
if (PIOS_MPU6000_ClaimBusISR(woken, false) != 0) {
return -1;
}
/* 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;
}
PIOS_MPU6000_ReleaseBusISR(woken);
return result;
}
/**
* @brief Obtains the number of bytes in the FIFO. Call from ISR only.
* @return the number of bytes in the FIFO
* @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_FifoDepthISR(bool *woken)
{
uint8_t mpu6000_send_buf[3] = { PIOS_MPU6000_FIFO_CNT_MSB | 0x80, 0, 0 };
uint8_t mpu6000_rec_buf[3];
if (PIOS_MPU6000_ClaimBusISR(woken, false) != 0) {
return -1;
}
if (PIOS_SPI_TransferBlock(dev->spi_id, &mpu6000_send_buf[0], &mpu6000_rec_buf[0], sizeof(mpu6000_send_buf), NULL) < 0) {
PIOS_MPU6000_ReleaseBusISR(woken);
return -1;
}
PIOS_MPU6000_ReleaseBusISR(woken);
return (mpu6000_rec_buf[1] << 8) | mpu6000_rec_buf[2];
}
/**
* @brief EXTI IRQ Handler. Read all the data from onboard buffer
* @return a boolean to the EXTI IRQ Handler wrapper indicating if a
* higher priority task is now eligible to run
*/
uint32_t mpu6000_irq = 0;
int32_t mpu6000_count;
uint32_t mpu6000_fifo_backup = 0;
uint8_t mpu6000_last_read_count = 0;
uint32_t mpu6000_fails = 0;
uint32_t mpu6000_interval_us;
uint32_t mpu6000_time_us;
uint32_t mpu6000_transfer_size;
bool PIOS_MPU6000_IRQHandler(void)
{
bool woken = false;
static uint32_t timeval;
mpu6000_interval_us = PIOS_DELAY_DiffuS(timeval);
timeval = PIOS_DELAY_GetRaw();
if (!mpu6000_configured) {
return false;
}
bool read_ok = false;
if (dev->cfg->User_ctl & PIOS_MPU6000_USERCTL_FIFO_EN) {
read_ok = PIOS_MPU6000_ReadFifo(&woken);
} else {
read_ok = PIOS_MPU6000_ReadSensor(&woken);
}
if (read_ok) {
bool woken2 = PIOS_MPU6000_HandleData();
woken |= woken2;
}
mpu6000_irq++;
mpu6000_time_us = PIOS_DELAY_DiffuS(timeval);
return woken;
}
static bool PIOS_MPU6000_HandleData()
{
// Rotate the sensor to OP convention. The datasheet defines X as towards the right
// and Y as forward. OP convention transposes this. Also the Z is defined negatively
// to our convention
static struct pios_mpu6000_data data;
// Currently we only support rotations on top so switch X/Y accordingly
switch (dev->cfg->orientation) {
case PIOS_MPU6000_TOP_0DEG:
#ifdef PIOS_MPU6000_ACCEL
data.accel_y = GET_SENSOR_DATA(mpu6000_data, Accel_X); // chip X
data.accel_x = GET_SENSOR_DATA(mpu6000_data, Accel_Y); // chip Y
#endif
data.gyro_y = GET_SENSOR_DATA(mpu6000_data, Gyro_X); // chip X
data.gyro_x = GET_SENSOR_DATA(mpu6000_data, Gyro_Y); // chip Y
break;
case PIOS_MPU6000_TOP_90DEG:
// -1 to bring it back to -32768 +32767 range
#ifdef PIOS_MPU6000_ACCEL
data.accel_y = -1 - (GET_SENSOR_DATA(mpu6000_data, Accel_Y)); // chip Y
data.accel_x = GET_SENSOR_DATA(mpu6000_data, Accel_X); // chip X
#endif
data.gyro_y = -1 - (GET_SENSOR_DATA(mpu6000_data, Gyro_Y)); // chip Y
data.gyro_x = GET_SENSOR_DATA(mpu6000_data, Gyro_X); // chip X
break;
case PIOS_MPU6000_TOP_180DEG:
#ifdef PIOS_MPU6000_ACCEL
data.accel_y = -1 - (GET_SENSOR_DATA(mpu6000_data, Accel_X)); // chip X
data.accel_x = -1 - (GET_SENSOR_DATA(mpu6000_data, Accel_Y)); // chip Y
#endif
data.gyro_y = -1 - (GET_SENSOR_DATA(mpu6000_data, Gyro_X)); // chip X
data.gyro_x = -1 - (GET_SENSOR_DATA(mpu6000_data, Gyro_Y)); // chip Y
break;
case PIOS_MPU6000_TOP_270DEG:
#ifdef PIOS_MPU6000_ACCEL
data.accel_y = GET_SENSOR_DATA(mpu6000_data, Accel_Y); // chip Y
data.accel_x = -1 - (GET_SENSOR_DATA(mpu6000_data, Accel_X)); // chip X
#endif
data.gyro_y = GET_SENSOR_DATA(mpu6000_data, Gyro_Y); // chip Y
data.gyro_x = -1 - (GET_SENSOR_DATA(mpu6000_data, Gyro_X)); // chip X
break;
}
#ifdef PIOS_MPU6000_ACCEL
data.accel_z = -1 - (GET_SENSOR_DATA(mpu6000_data, Accel_Z));
#endif
data.gyro_z = -1 - (GET_SENSOR_DATA(mpu6000_data, Gyro_Z));
data.temperature = GET_SENSOR_DATA(mpu6000_data, Temperature);
BaseType_t higherPriorityTaskWoken;
xQueueSendToBackFromISR(dev->queue, (void *)&data, &higherPriorityTaskWoken);
return higherPriorityTaskWoken == pdTRUE;
}
static bool PIOS_MPU6000_ReadSensor(bool *woken)
{
const uint8_t mpu6000_send_buf[1 + PIOS_MPU6000_SAMPLES_BYTES] = { PIOS_MPU6000_SENSOR_FIRST_REG | 0x80 };
if (PIOS_MPU6000_ClaimBusISR(woken, true) != 0) {
return false;
}
if (PIOS_SPI_TransferBlock(dev->spi_id, &mpu6000_send_buf[0], &mpu6000_data.buffer[0], sizeof(mpu6000_data_t), NULL) < 0) {
PIOS_MPU6000_ReleaseBusISR(woken);
mpu6000_fails++;
return false;
}
PIOS_MPU6000_ReleaseBusISR(woken);
return true;
}
static bool PIOS_MPU6000_ReadFifo(bool *woken)
{
/* Temporary fix for OP-1049. Expected to be superceded for next major release
* by code changes for OP-1039.
* Read interrupt status register to check for FIFO overflow. Must be the
* first read after interrupt, in case the device is configured so that
* any read clears in the status register (PIOS_MPU6000_INT_CLR_ANYRD set in
* interrupt config register) */
int32_t result;
if ((result = PIOS_MPU6000_GetInterruptStatusRegISR(woken)) < 0) {
return false;
}
if (result & PIOS_MPU6000_INT_STATUS_FIFO_OVERFLOW) {
/* The FIFO has overflowed, so reset it,
* to enable sample sync to be recovered.
* If the reset fails, we are in trouble, but
* we keep trying on subsequent interrupts. */
PIOS_MPU6000_ResetFifoISR(woken);
/* Return and wait for the next new sample. */
return false;
}
/* Usual case - FIFO has not overflowed. */
mpu6000_count = PIOS_MPU6000_FifoDepthISR(woken);
if (mpu6000_count < PIOS_MPU6000_SAMPLES_BYTES) {
return false;
}
if (PIOS_MPU6000_ClaimBusISR(woken, true) != 0) {
return false;
}
const uint8_t mpu6000_send_buf[1 + PIOS_MPU6000_SAMPLES_BYTES] = { PIOS_MPU6000_FIFO_REG | 0x80 };
if (PIOS_SPI_TransferBlock(dev->spi_id, &mpu6000_send_buf[0], &mpu6000_data.buffer[0], sizeof(mpu6000_data_t), NULL) < 0) {
PIOS_MPU6000_ReleaseBusISR(woken);
mpu6000_fails++;
return false;
}
PIOS_MPU6000_ReleaseBusISR(woken);
// In the case where extras samples backed up grabbed an extra
if (mpu6000_count >= PIOS_MPU6000_SAMPLES_BYTES * 2) {
mpu6000_fifo_backup++;
if (PIOS_MPU6000_ClaimBusISR(woken, true) != 0) {
return false;
}
if (PIOS_SPI_TransferBlock(dev->spi_id, &mpu6000_send_buf[0], &mpu6000_data.buffer[0], sizeof(mpu6000_data_t), NULL) < 0) {
PIOS_MPU6000_ReleaseBusISR(woken);
mpu6000_fails++;
return false;
}
PIOS_MPU6000_ReleaseBusISR(woken);
}
return true;
}
#endif /* PIOS_INCLUDE_MPU6000 */
/**
* @}
* @}
*/