Multiple I2C with MPU9250

[gawsalyan]

Hi...
How can I change the code to connect at least 2 MPU9250 sensor to STM32F401RE to different I2C buses

[kriswiner]

Each device can be 0x68 or 0c69 depending on whether the SDO pin id LOW or
HIGH, respectively. So the strategy to read multiple MPU9250 on the same bus
is to set them all LOW except for the one device you want to read, its
address will be 0x69. Just keep toggling all of the devices until you have
read them all, then repeat. Or you can use an I2C multiplexer like the
TCA9548A available at Tindie.com.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 22, 2016 9:53 PM
To: kriswiner/MPU-9250
Subject: [MPU-9250] Multiple I2C with MPU9250 (#37)

Hi
How can I change the code to connect at least 2 MPU9250 sensor to
STM32F401RE to different I2C buses

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[gawsalyan]

Thanks a lot Robert,
But I need to connect sensors with every i2c master of STM32F401RE and I couldn't able to achieve high speed, i.e.. I have reached only about 200+ Hz with your code, but I need at least 350+ fused data.
How can I change the MPU9150/9250 library to support that.

[kriswiner]

My pleasure Wilbur,

What do you mean by speed? Speed of the sensor fusion? With Madgwick or
Mahony? I was able to easily get 1 kHz fusion rates using an STM32F4 Nucleo
board.

If you mean sample data rate, then you just have to change the input
parameter at the beginning of the sketch to a higher rate. The accel and
gyro supports rates at or above 1 kHz.

I still do not understand what you are asking...

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 23, 2016 8:31 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Thanks a lot Robert,
But I need to connect sensors with every i2c master of STM32F401RE and I
couldn't able to achieve high speed, i.e.. I have reached only about 200+ Hz
with your code, but I need at least 350+ fused data.
How can I change the MPU9150/9250 library to support that.

Reply to this email directly or view it on GitHub
#37 (comment) .
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[gawsalyan]

I am accessing mpu9150 sensor using my Stm32f401 I2C with ur library.
..only change I did was..I changed the serial out to virtual com port...but
i could only able to achieve about 200 quaternion output...how can I
increase it to above 350.

Thank u
On 23 Jan 2016 23:10, "Kris Winer" notifications@github.com wrote:

My pleasure Wilbur,

What do you mean by speed? Speed of the sensor fusion? With Madgwick or
Mahony? I was able to easily get 1 kHz fusion rates using an STM32F4 Nucleo
board.

If you mean sample data rate, then you just have to change the input
parameter at the beginning of the sketch to a higher rate. The accel and
gyro supports rates at or above 1 kHz.

I still do not understand what you are asking...

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 23, 2016 8:31 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Thanks a lot Robert,
But I need to connect sensors with every i2c master of STM32F401RE and I
couldn't able to achieve high speed, i.e.. I have reached only about 200+
Hz
with your code, but I need at least 350+ fused data.
How can I change the MPU9150/9250 library to support that.

Reply to this email directly or view it on GitHub
#37 (comment) .
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#37 (comment).

[kriswiner]

The problem with the MPU9150 is the mag, which must be read with a one-time
only write/read, not a continuous 100 Hz read like the MPU9250, so the rate
is limited by the time it takes to write to the mag to tell it to prepare a
sample, and then read the sample data. I am surprised you can even get to
200 Hz fusion rates. It takes ~10 ms for the AK8975 mag to write/read the
data.

Switch to the MPU9250 and you should achieve rates above 1 kHz if desired.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 23, 2016 10:33 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

I am accessing mpu9150 sensor using my Stm32f401 I2C with ur library.
..only change I did was..I changed the serial out to virtual com port...but
i could only able to achieve about 200 quaternion output...how can I
increase it to above 350.

Thank u
On 23 Jan 2016 23:10, "Kris Winer" notifications@github.com wrote:

My pleasure Wilbur,

What do you mean by speed? Speed of the sensor fusion? With Madgwick or
Mahony? I was able to easily get 1 kHz fusion rates using an STM32F4
Nucleo
board.

If you mean sample data rate, then you just have to change the input
parameter at the beginning of the sketch to a higher rate. The accel and
gyro supports rates at or above 1 kHz.

I still do not understand what you are asking...

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 23, 2016 8:31 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Thanks a lot Robert,
But I need to connect sensors with every i2c master of STM32F401RE and I
couldn't able to achieve high speed, i.e.. I have reached only about 200+
Hz
with your code, but I need at least 350+ fused data.
How can I change the MPU9150/9250 library to support that.

Reply to this email directly or view it on GitHub
#37 (comment) .
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Reply to this email directly or view it on GitHub
#37 (comment).

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[gawsalyan]

Really thank you for your advice and valuable time. But I tried with MPU9250 also.. I couldn't achieve high data rate. And How can I use other I2c master of the STM32F4 board to connect other sensors. ​

[kriswiner]

There must be something wrong with your setup; I am able to get greater than 1 KHz fusion rates with a Cortex M4 rocessor.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 23, 2016 6:08 PM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Really thank you for your advice and valuable time.

But I tried with MPU9250 also.. I couldn't achieve high data rate.
And How can I use other I2c master of the STM32F4 board to connect other
sensors.
​

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[gawsalyan]

I connected my MPU9250 SCL and SDA to PB_8 and PB_9 VCC and GND to 3.3V annd GND. And I only commented the coding which is respect to lcd displays only...my output is on the hyper terminal so, I use SERIAL_TX and SERIAL_RX as my Serial out. Is there anything I can DO.. and what about multiple I2C master

[gawsalyan]

Sorry ..it was my fault...it's not the data rate. ..but when I try to print
it through serial port pc. it's serial out rate is low. Is there anyway to
increase the terminal output..or is it possible to wifi shield and increase
the output from STM32F401 to PC.
On 24 Jan 2016 07:47, "Siva Gawsalyan" gawsalyan@gmail.com wrote:

I connected my MPU9250 SCL and SDA to PB_8 and PB_9 VCC and GND to 3.3V
annd GND.
And I only commented the coding which is respect to lcd displays only...my
output is on the hyper terminal so, I use SERIAL_TX and SERIAL_RX as my
Serial out.
Is there anything I can DO..
and what about multiple I2C master

[kriswiner]

I don't know, but why not try an LCD display like the Nokia 5110, the update
rate is much faster than serial.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 24, 2016 5:32 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Sorry ..it was my fault...it's not the data rate. ..but when I try to print
it through serial port pc. it's serial out rate is low. Is there anyway to
increase the terminal output..or is it possible to wifi shield and increase
the output from STM32F401 to PC.
On 24 Jan 2016 07:47, "Siva Gawsalyan" gawsalyan@gmail.com wrote:

I connected my MPU9250 SCL and SDA to PB_8 and PB_9 VCC and GND to 3.3V
annd GND.
And I only commented the coding which is respect to lcd displays only...my
output is on the hyper terminal so, I use SERIAL_TX and SERIAL_RX as my
Serial out.
Is there anything I can DO..
and what about multiple I2C master

Reply to this email directly or view it on GitHub
#37 (comment) .
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pdMnFgaJpZM4HK3Pp.gif>

[gawsalyan]

I am developing a Java based platform also to view the motion..that's why I
need to do that...
Can u give me suggestion on using multiple sensors with different i2c.?
On 24 Jan 2016 23:09, "Kris Winer" notifications@github.com wrote:

I don't know, but why not try an LCD display like the Nokia 5110, the
update
rate is much faster than serial.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 24, 2016 5:32 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Sorry ..it was my fault...it's not the data rate. ..but when I try to print
it through serial port pc. it's serial out rate is low. Is there anyway to
increase the terminal output..or is it possible to wifi shield and increase
the output from STM32F401 to PC.
On 24 Jan 2016 07:47, "Siva Gawsalyan" gawsalyan@gmail.com wrote:

I connected my MPU9250 SCL and SDA to PB_8 and PB_9 VCC and GND to 3.3V
annd GND.
And I only commented the coding which is respect to lcd displays
only...my
output is on the hyper terminal so, I use SERIAL_TX and SERIAL_RX as my
Serial out.
Is there anything I can DO..
and what about multiple I2C master

Reply to this email directly or view it on GitHub
#37 (comment) .
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#37 (comment).

[kriswiner]

I thought I already described how to do this. You can also use one of these:

https://www.tindie.com/products/onehorse/tca9548a-i2c-multiplexer/

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 24, 2016 5:14 PM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

I am developing a Java based platform also to view the motion..that's why I
need to do that...
Can u give me suggestion on using multiple sensors with different i2c.?
On 24 Jan 2016 23:09, "Kris Winer" notifications@github.com wrote:

I don't know, but why not try an LCD display like the Nokia 5110, the
update
rate is much faster than serial.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 24, 2016 5:32 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Sorry ..it was my fault...it's not the data rate. ..but when I try to
print
it through serial port pc. it's serial out rate is low. Is there anyway to
increase the terminal output..or is it possible to wifi shield and
increase
the output from STM32F401 to PC.
On 24 Jan 2016 07:47, "Siva Gawsalyan" gawsalyan@gmail.com wrote:

I connected my MPU9250 SCL and SDA to PB_8 and PB_9 VCC and GND to 3.3V
annd GND.
And I only commented the coding which is respect to lcd displays
only...my
output is on the hyper terminal so, I use SERIAL_TX and SERIAL_RX as my
Serial out.
Is there anything I can DO..
and what about multiple I2C master

Reply to this email directly or view it on GitHub
#37 (comment) .
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Reply to this email directly or view it on GitHub
#37 (comment).

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#37 (comment) .
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[gawsalyan]

i am able to achieve that using higher baudrate 921600.

is it possible instanciate two MPU9250 in the mbed environment to use it
via second i2c master?

On Mon, Jan 25, 2016 at 6:54 AM, Kris Winer notifications@github.com
wrote:

I thought I already described how to do this. You can also use one of
these:

https://www.tindie.com/products/onehorse/tca9548a-i2c-multiplexer/

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 24, 2016 5:14 PM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

I am developing a Java based platform also to view the motion..that's why I
need to do that...
Can u give me suggestion on using multiple sensors with different i2c.?
On 24 Jan 2016 23:09, "Kris Winer" notifications@github.com wrote:

I don't know, but why not try an LCD display like the Nokia 5110, the
update
rate is much faster than serial.

-----Original Message-----
From: gawsalyan [mailto:notifications@github.com]
Sent: January 24, 2016 5:32 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [MPU-9250] Multiple I2C with MPU9250 (#37)

Sorry ..it was my fault...it's not the data rate. ..but when I try to
print
it through serial port pc. it's serial out rate is low. Is there anyway
to
increase the terminal output..or is it possible to wifi shield and
increase
the output from STM32F401 to PC.
On 24 Jan 2016 07:47, "Siva Gawsalyan" gawsalyan@gmail.com wrote:

I connected my MPU9250 SCL and SDA to PB_8 and PB_9 VCC and GND to 3.3V
annd GND.
And I only commented the coding which is respect to lcd displays
only...my
output is on the hyper terminal so, I use SERIAL_TX and SERIAL_RX as my
Serial out.
Is there anything I can DO..
and what about multiple I2C master

Reply to this email directly or view it on GitHub
#37 (comment)
.
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#37 (comment).

Sivapalan Gawsalyan

[YanJenHuang]

Hi Kris,
I am connecting two MPU9250 using I2C, and I pulled AD0 to low or high to change the address 0x68, 0x69.
I have an issue here:
When I pull AD0 to low, the mpu9250 address is 0x68, but I set the address to 0x69 purposely, I cannot read accelerator or gyro raw data, it make sense, but when I am reading the mag raw data, I get the mag raw data!!
So I am confused what should do then I can read the individual mag raw data from two sensor?

[kriswiner]

Each MPU9250 has an internal switch to allow mag acces from the host. Just
turn this switch off for the MPU9250 with I2C address 0x68 and you can read
the mag from the MPU9250 with address 0x69.

// Configure Interrupts and Bypass Enable
// Set interrupt pin active high, push-pull, hold interrupt pin level HIGH
until interrupt cleared,
// clear on read of INT_STATUS, and enable I2C_BYPASS_EN so additional chips

// can join the I2C bus and all can be controlled by the Arduino as master
writeByte(MPU9250_ADDRESS, INT_PIN_CFG, 0x22);

set INT_PIN_CFG to 0x20 to turn off switch.

-----Original Message-----
From: YanJenHuang [mailto:notifications@github.com]
Sent: April 9, 2016 1:22 AM
To: kriswiner/MPU-9250
Cc: Kris Winer
Subject: Re: [kriswiner/MPU-9250] Multiple I2C with MPU9250 (#37)

Hi Kris,
I am connecting two MPU9250 using I2C, and I pulled AD0 to low or high to
change the address 0x68, 0x69.
I have an issue here:
When I pull AD0 to low, the mpu9250 address is 0x68, but I set the address
to 0x69 purposely, I cannot read accelerator or gyro raw data, it make
sense, but when I am reading the mag raw data, I get the mag raw data!!
So I am confused what should do then I can read the individual mag raw data
from two sensor?

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[YanJenHuang]

Thanks Kris~
I will try it. =)

[KhArtNJava]

@kriswiner , I still can't understand, if we will change MPU-9250 address by AD0, that described in datasheet like

it will change only MPU9250_ADDRESS, but what about AK8963_ADDRESS ?
What will be happened with AK8963_ADDRESS, if AD0 will be HIGH (will be 1)?
Will mag AK8963 be still accessible by AK8963_ADDRESS=0x0C, when AD0 = 1? Or, will mag be disabled, when AD0 = 1 ? If it will be disabled, where is info about it in MPU-9250 datasheet?
MPU-9250-Datasheet.pdf

[KhArtNJava]

What will be happened with AK8963 address, when AD0=1? Will it be changed, or not?
If not, how to read mag data from multiple MPU-9250, if many of AK8963 will have same address?
Thank you!

[KhArtNJava]

Looks, I understood it... I've correctly understand your prev post, when I wrote this ))).

[kriswiner]

OK, then did you get it to work?

-----Original Message-----
From: Arthur [mailto:notifications@github.com]
Sent: November 23, 2016 8:23 AM
To: kriswiner/MPU-9250
Cc: Kris Winer; Mention
Subject: Re: [kriswiner/MPU-9250] Multiple I2C with MPU9250 (#37)

Looks, I understood it... I've correctly understand your prev post, when I
wrote this ))).

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[kriswiner]

When you change the MPU9250 ADO this does not change the I2C address of the AK8963C. The correct way to handle multiple MPU9250's on a single I2C bus is described here:

#86

but you can also do this:
Each MPU9250 has an internal switch to allow mag acces from the host. Just turn this switch off for the MPU9250 with I2C address 0x68 and you can read the mag from the MPU9250 with address 0x69. // Configure Interrupts and Bypass Enable // Set interrupt pin active high, push-pull, hold interrupt pin level HIGH until interrupt cleared, // clear on read of INT_STATUS, and enable I2C_BYPASS_EN so additional chips // can join the I2C bus and all can be controlled by the Arduino as master writeByte(MPU9250_ADDRESS, INT_PIN_CFG, 0x22); set INT_PIN_CFG to 0x20 to turn off switch.

[KhArtNJava]

No, now I still learning datasheet and Register map.
I think, I will do like

1. Set AD0 = 1 for all MPU;
2. In cycle, set AD0=0 for each MPU and try to set INT_PIN_CFG to 0x20 and power down mag with AK8963_CNTL
3. In cycle, before poll sensors, I plan to set INT_PIN_CFG to 0x22 and power up mag with AK8963_CNTL, after that read sensors data, set INT_PIN_CFG to 0x20 and power down mag with AK8963_CNTL.

Ie,

1. on init - power off mags in all MPU modules, set INT_PIN_CFG to 0x20.
2. Before reading data, enable BYPASS_EN and power up mag in needed MPU module, read data from sensors on this module, power off mag in this MPU module and disable BYPASS_EN for this module.
3. Go to next MPU module and repeat from step 2. Do this in infinite loop.

Is it correct idea?

[kriswiner]

You should be able to leave the AK8963 on all the time and just use INT_CFG
to open and close the internal I2C switch to enable or disable access to the
AK8963.

But using the slave registers is the better way to do it.

-----Original Message-----
From: Arthur [mailto:notifications@github.com]
Sent: November 23, 2016 9:02 AM
To: kriswiner/MPU-9250
Cc: Kris Winer; Mention
Subject: Re: [kriswiner/MPU-9250] Multiple I2C with MPU9250 (#37)

No, now I still learning datasheet and Register map.
I think, I will do like

1. Set AD0 = 1 for all MPU;
2. In cycle, set AD0=0 for each MPU and try to set INT_PIN_CFG to 0x20
   and power down mag with AK8963_CNTL
3. In cycle, before poll sensors, I plan to set INT_PIN_CFG to 0x22 and
   power up mag with AK8963_CNTL, after that read sensors data, set INT_PIN_CFG
   to 0x20 and power down mag with AK8963_CNTL.

Ie,

1. on init - power off mags in all MPU modules, set INT_PIN_CFG to
   0x20.
2. Before reading data, enable BYPASS_EN and power up mag in needed MPU
   module, read data from sensors on this module, power off mag in this MPU
   module and disable BYPASS_EN for this module.
3. Go to next MPU module and repeat from step 2. Do this in infinite
   loop.

Is it correct idea?

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