inv_mpu6050 drivers

[Mark A. Yoder]

I just wired up a mpu6050 to the i2c-2 bus on my BeagleBone Black.

lsmod shows:

bone$ lsmod

Module                  Size  Used by

bmp280_i2c             16384  0

bmp280                 20480  1 bmp280_i2c

inv_mpu6050_i2c        16384  0

inv_mpu6050            20480  1 inv_mpu6050_i2c

evdev                  24576  1

usb_f_mass_storage     53248  2

usb_f_acm              16384  2

u_serial               20480  3 usb_f_acm

usb_f_ecm              20480  2

usb_f_rndis            32768  4

u_ether                20480  2 usb_f_ecm,usb_f_rndis

libcomposite           65536  18 usb_f_ecm,usb_f_acm,usb_f_mass_storage,usb_f_rndis

bc_example             20480  0

iptable_nat            16384  0

nf_conntrack_ipv4      20480  1

nf_defrag_ipv4         16384  1 nf_conntrack_ipv4

nf_nat_ipv4            16384  1 iptable_nat

pvrsrvkm              442368  1 bc_example

nf_nat                 32768  1 nf_nat_ipv4

nf_conntrack          143360  3 nf_conntrack_ipv4,nf_nat_ipv4,nf_nat

iptable_mangle         16384  0

iptable_filter         16384  0

uio_pdrv_genirq        16384  0

uio                    20480  1 uio_pdrv_genirq

spidev                 20480  0

pruss_soc_bus          16384  0

pru_rproc              28672  0

pruss                  16384  1 pru_rproc

pruss_intc             16384  1 pru_rproc

ip_tables              24576  3 iptable_mangle,iptable_filter,iptable_nat

x_tables               36864  3 iptable_mangle,ip_tables,iptable_filter

What do I do next to read the device?  I assume it appears somewhere is user space, but I don't know where.

--Mark

[Vaishnav MA]

Hi,

I believe the MPU6050 shows up as an IIO device under : /sys/bus/iio/devices/iio\:deviceX

Regards

Vaishnav

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[Mark A. Yoder]

I see the ADC's there and I see the BMP085.   I got the BMP085 to appear using:

echo bmp085 0x77 > /sys/class/i2c-adapter/i2c-2/new_device

I don't know how to get the MPU6050 to appear.

--Mark

On Friday, August 23, 2019 at 3:02:51 PM UTC-4, Vaishnav MA wrote:

Hi,

I believe the MPU6050 shows up as an IIO device under : /sys/bus/iio/devices/iio\:deviceX

Regards

Vaishnav

To unsubscribe from this group and stop receiving emails from it, send an email to beagl...@googlegroups.com.

[Vaishnav MA]

On Sat, Aug 24, 2019 at 5:51 PM Mark A. Yoder <mark.a...@gmail.com> wrote:

I see the ADC's there and I see the BMP085.   I got the BMP085 to appear using:

echo bmp085 0x77 > /sys/class/i2c-adapter/i2c-2/new_device

It looks like the MPU6050 driver requires a valid Interrupt GPIO to be passed to it for working properly ( I'm not 100% sure if this is the case with MPU6050 as I have experience working with MPU9250 from the same family), this can be clearly understood by looking if the dmesg logs show a " trigger probe fail " message. If this is the case then I'm not sure if there exists a proper way to instantiate the device from userspace (like echo > i2c-adapter/new_device).

I don't know how to get the MPU6050 to appear.

I think using a Device Tree Overlay is the proper way to do it,  an overlay like https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BBBLUE-MPU9250-00A0.dts can be used as reference 

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