Mpu9250

English | 简体中文 | 繁體中文 | 日本語 | Deutsch | 한국어

<div align=center> <img src="/doc/image/logo.svg" width="400" height="150"/> </div>

LibDriver MPU9250

MPU9250 is a multi-chip module (MCM) consisting of two dies integrated into a single QFN package. One die houses the 3-Axis gyroscope and the 3-Axis accelerometer. The other die houses the AK8963 3-Axis magnetometer from Asahi Kasei Microdevices Corporation. Hence, the MPU9250 is a 9-axis MotionTracking device that combines a 3-axis gyroscope, 3-axis accelerometer, 3-axis magnetometer and a Digital Motion Processor™ (DMP) all in a small 3x3x1mm package available as a pin-compatible upgrade from the MPU6515.With its dedicated I2C sensor bus, the MPU9250 directly provides complete 9-axis MotionFusion™ output. The MPU9250 MotionTracking device, with its 9-axis integration, on-chip MotionFusion™, and runtime calibration firmware, enables manufacturers to eliminate the costly and complex selection, qualification, and system level integration of discrete devices, guaranteeing optimal motion performance for consumers.MPU9250 is also designed to interface with multiple non-inertial digital sensors, such as pressure sensors, on its auxiliary I2C port.MPU9250 features three 16-bit analog-to-digital converters (ADCs) for digitizing the gyroscope outputs, three 16-bit ADCs for digitizing the accelerometer outputs, and three 16-bit ADCs for digitizing the magnetometer outputs. For precision tracking of both fast and slow motions, the parts feature a user-programmable gyroscope full-scale range of ±250, ±500, ±1000, and ±2000°/sec (dps), a user-programmable accelerometer full-scale range of ±2g, ±4g, ±8g, and ±16g, and a magnetometer full-scale range of ±4800μT.

LibDriver MPU9250 is a full-featured driver for MPU9250, launched by LibDriver. It provides acceleration reading, angular velocity reading, magnetometer reading, attitude angle reading, dmp reading, tap detection and additional features. LibDriver is MISRA compliant.

Table of Contents

• Instruction
• Install
• Usage
  • example basic
  • example fifo
  • example dmp
• Document
• Contributing
• License
• Contact Us

Instruction

/src includes LibDriver MPU9250 source files.

/interface includes LibDriver MPU9250 IIC, SPI platform independent template.

/test includes LibDriver MPU9250 driver test code and this code can test the chip necessary function simply.

/example includes LibDriver MPU9250 sample code.

/doc includes LibDriver MPU9250 offline document.

/datasheet includes MPU9250 datasheet.

/project includes the common Linux and MCU development board sample code. All projects use the shell script to debug the driver and the detail instruction can be found in each project's README.md.

/misra includes the LibDriver MISRA code scanning results.

Install

Reference /interface IIC, SPI platform independent template and finish your platform IIC, SPI driver.

Add the /src directory, the interface driver for your platform, and your own drivers to your project, if you want to use the default example drivers, add the /example directory to your project.

Usage

You can refer to the examples in the /example directory to complete your own driver. If you want to use the default programming examples, here's how to use them.

example basic

#include "driver_mpu9250_basic.h"

uint8_t res;
uint32_t i;
uint32_t times;
float g[3];
float dps[3];
float ut[3];
float degrees;
mpu9250_address_t addr;

/* init */
addr = MPU9250_ADDRESS_AD0_LOW;
res = mpu9250_basic_init(MPU9250_INTERFACE_IIC, addr);
if (res != 0)
{
    return 1;
}

...
    
/* read all */
times = 3;
for (i = 0; i < times; i++)
{
    /* read */
    if (mpu9250_basic_read(g, dps, ut) != 0)
    {
        (void)mpu9250_basic_deinit();

        return 1;
    }

    ...
        
    if (mpu9250_basic_read_temperature(&degrees) != 0)
    {
        (void)mpu9250_basic_deinit();

        return 1;
    }

    ...
        
    /* output */
    mpu9250_interface_debug_print("mpu9250: %d/%d.\n", i + 1, times);
    mpu9250_interface_debug_print("mpu9250: acc x is %0.2fg.\n", g[0]);
    mpu9250_interface_debug_print("mpu9250: acc y is %0.2fg.\n", g[1]);
    mpu9250_interface_debug_print("mpu9250: acc z is %0.2fg.\n", g[2]);
    mpu9250_interface_debug_print("mpu9250: gyro x is %0.2fdps.\n", dps[0]);
    mpu9250_interface_debug_print("mpu9250: gyro y is %0.2fdps.\n", dps[1]);
    mpu9250_interface_debug_print("mpu9250: gyro z is %0.2fdps.\n", dps[2]);
    mpu9250_interface_debug_print("mpu9250: mag x is %0.2fuT.\n", ut[0]);
    mpu9250_interface_debug_print("mpu9250: mag y is %0.2fuT.\n", ut[1]);
    mpu9250_interface_debug_print("mpu9250: mag z is %0.2fuT.\n", ut[2]);
    mpu9250_interface_debug_print("mpu9250: temperature %0.2fC.\n", degrees);

    ...
        
    /* delay 1000 ms */
    mpu9250_interface_delay_ms(1000);

    ...
}

...
    
/* deinit */
(void)mpu9250_basic_deinit();

return 0;

example fifo

#include "driver_mpu9250_fifo.h"

uint32_t i;
uint32_t times;
uint16_t len;
uint8_t (*g_gpio_irq)(void) = NULL;
static int16_t gs_accel_raw[128][3];
static float gs_accel_g[128][3];
static int16_t gs_gyro_raw[128][3];
static float gs_gyro_dps[128][3];
atic int16_t gs_mag_raw[128][3];
static float gs_mag_ut[128][3];
mpu9250_address_t addr;

/* gpio init */
if (gpio_interrupt_init() != 0)
{
    return 1;
}
g_gpio_irq = mpu9250_fifo_irq_handler;

/* init */
addr = MPU9250_ADDRESS_AD0_LOW;
if (mpu9250_fifo_init(MPU9250_INTERFACE_IIC, addr) != 0)
{
    g_gpio_irq = NULL;
    (void)gpio_interrupt_deinit();

    return 1;
}

/* delay 100 ms */
mpu9250_interface_delay_ms(100);

...

times = 3;
for (i = 0; i < times; i++)
{
    len = 128;

    /* read */
    if (mpu9250_fifo_read(gs_accel_raw, gs_accel_g,
                          gs_gyro_raw, gs_gyro_dps, gs_mag_raw, gs_mag_ut, &len) != 0)
    {
        (void)mpu9250_fifo_deinit();
        g_gpio_irq = NULL;
        (void)gpio_interrupt_deinit();

        return 1;
    }
    
    ...
        
    /* output */
    mpu9250_interface_debug_print("mpu9250: %d/%d.\n", i + 1, times);
    mpu9250_interface_debug_print("mpu9250: fifo %d.\n", len);
    mpu9250_interface_debug_print("mpu9250: acc x[0] is %0.2fg.\n", gs_accel_g[0][0]);
    mpu9250_interface_debug_print("mpu9250: acc y[0] is %0.2fg.\n", gs_accel_g[0][1]);
    mpu9250_interface_debug_print("mpu9250: acc z[0] is %0.2fg.\n", gs_accel_g[0][2]);
    mpu9250_interface_debug_print("mpu9250: gyro x[0] is %0.2fdps.\n", gs_gyro_dps[0][0]);
    mpu9250_interface_debug_print("mpu9250: gyro y[0] is %0.2fdps.\n", gs_gyro_dps[0][1]);
    mpu9250_interface_debug_print("mpu9250: gyro z[0] is %0.2fdps.\n", gs_gyro_dps[0][2]);
    mpu9250_interface_debug_print("mpu9250: mag x[0] is %0.2fuT.\n", gs_mag_ut[0][0]);
    mpu9250_interface_debug_print("mpu9250: mag y[0] is %0.2fuT.\n", gs_mag_ut[0][1]);
    mpu9250_interface_debug_print("mpu9250: mag z[0] is %0.2fuT.\n", gs_mag_ut[0][2]);
    
    ...
        
    /* delay 100 ms */
    mpu9250_interface_delay_ms(100);
    
    ...
}

...
    
/* deinit */
(void)mpu9250_fifo_deinit();
g_gpio_irq = NULL;
(void)gpio_interrupt_deinit();

return 0;

example dmp

#include "driver_mpu9250_dmp.h"

uint32_t i;
uint32_t times;
uint32_t cnt;
uint16_t len;
uint8_t (*g_gpio_irq)(void) = NULL;
static int16_t gs_accel_raw[128][3];
static float gs_accel_g[128][3];
static int16_t gs_gyro_raw[128][3];      
static float gs_gyro_dps[128][3];
static int32_t gs_quat[128][4];          
static float gs_pitch[128];              
static float gs_roll[128];                
static float gs_yaw[128];                      
mpu9250_address_t addr;

static void a_receive_callback(uint8_t type)
{
    switch (type)
    {
        case MPU9250_INTERRUPT_MOTION :
        {
            mpu9250_interface_debug_print("mpu9250: irq motion.\n");
            
            break;
        }
        case MPU9250_INTERRUPT_FIFO_OVERFLOW :
        {
            mpu9250_interface_debug_print("mpu9250: irq fifo overflow.\n");
            
            break;
        }
        case MPU9250_INTERRUPT_FSYNC_INT :
        {
            mpu9250_interface_debug_print("mpu9250: irq fsync int.\n");
            
            break;
        }
        case MPU9250_INTERRUPT_DMP :
        {
            mpu9250_interface_debug_print("mpu9250: irq dmp\n");
            
            break;
        }
        case MPU9250_INTERRUPT_DATA_READY :
        {
            mpu9250_interface_debug_print("mpu9250: irq data ready\n");
            
            break;
        }
        default :
        {
            mpu9250_interface_debug_print("mpu9250: irq unknown code.\n");
            
            break;
        }
    }
}

static void a_dmp_tap_callback(uint8_t count, uint8_t direction)
{
    switch (direction)
    {
        case MPU9250_DMP_TAP_X_UP :
        {
            mpu9250_interface_debug_print("mpu9250: tap irq x up with %d.\n", count);
            
            break;
        }
        case MPU9250_DMP_TAP_X_DOWN :
        {
            mpu9250_interface_debug_print("mpu9250: tap irq x down with %d.\n", count);
            
            break;
        }
        case MPU9250_DMP_TAP_Y_UP :
        {
            mpu9250_interface_debug_print("mpu9250: tap irq y up with %d.\n", count);
            
            break;
        }
        case MPU9250_DMP_TAP_Y_DOWN :
        {
            mpu9250_interface_debug_prin