Get X,Y,Z values from LIS3DH using nrf52 development board

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Piyush_9536 — Thu, 03 Feb 2022 16:23:11 GMT

can you please tell me how you had taken the values of divider corresponding to different G?

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Nats — Mon, 18 May 2020 10:28:50 GMT

Can you kindly share the code if possible along with drivers?...Im kinda facing the same problem

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

B.John — Thu, 21 Feb 2019 18:16:21 GMT

Hey Prasad, wondering if you finally got it to work and would be great if you could please share your work.

Thank you.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Wed, 21 Nov 2018 09:12:13 GMT

Yes, MDBT42 module advertises BLE & data is received on Android. The issue with MDBT modules is sometimes they won't work or fit on the custom PCB you want to design or gives routing issues which result in abnormal behavior of other GPIO peripherals like LEDs won't glow proper or i2c will not work.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Rajneesh — Mon, 20 Aug 2018 21:20:35 GMT

Hi Vishal, Does MDBT42V advertise BLE? Which setting did you do? I see there is no any external crystals are connected.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Prasad PL — Mon, 16 Jul 2018 08:59:27 GMT

Thanks Edvin.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Mon, 16 Jul 2018 06:45:15 GMT

If you are looking for code that enables interrupts on pins, I would suggest that you look at the SDK\examples\peripheral\pin_int_change example. I believe that this does what you are looking for.

Description here.

Best regards,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Prasad PL — Mon, 09 Jul 2018 21:17:29 GMT

Edvin,

I could get the LIS3DH over i2C to read and write using these files on some of my custom hardware using v15 SDK.

But I am stuck at GPIOTE code to capture the interrupt from LIS3DH.

It is not clear what code/libraries has become obsolete from Nordic info center.

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v12.0.0%2Flib_gpiote.html

Some critical code "app_gpiote_user_register" that is being used in these files - seems obsolete as per documentation.

retval = app_gpiote_user_register(&m_example_user_id,

low_to_high_bitmask,

high_to_low_bitmask,

example_gpiote_event_handler);

Would you route me to some example code or information on recent legacy GPIOTE driver one must use for new projects.

Regards,

Prasad

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Wed, 30 May 2018 12:34:21 GMT

Can you analyze i2c/twi traffic over it? I would recommend something like the saleae analyzer, as it can translate the i2c signal into chars that are readable for humans, but I assume that you can test with the oscilloscope as well. Just see if there is any data on the i2c wires makes any sense.

BR,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Wed, 30 May 2018 10:28:09 GMT

We have http://www.gwinstek.com/en-global/products/Oscilloscopes/Digital_Storage_Oscilloscopes/GDS-1000A-U this Oscilloscope right now can be debug the target board using this?

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Wed, 23 May 2018 10:19:30 GMT

Ok,

Try to "sniff" the I2C traffic using a logic analyzer, such as the saleae analyzer. See if you can see any difference using the module and the DK. It might be that the LIS3DH has a more strict timing requirement. But either way, try to check the signal using a logic analyzer.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Wed, 23 May 2018 09:44:26 GMT

BLE is advertising & I am getting TEMPERATURE from MAX IC on BLE using external pull-ups of 4.7kohm. then I don't think there's a crystal problem?

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Wed, 23 May 2018 09:33:40 GMT

Sorry. SDK11 was before the sdk_config.h file was introduced. But if you have a LFXTAL, you should not use the RC Oscillator, so never mind.

I am no XTAL expert, but am I right if the load capacitance of your LFXTAL is 12.5pF? Please confirm this before looking at the calculations below (!)

According to the nRF Spec, the capacitance of C9 and C10. The formula for the external capacitors is:

Since 21pF is not available, you should go for 18pF on C9 and C10. I got this confirmed from one of our HW guys. He recommended to go down to 18pF, since you often have a bit of capacitance in the PCB trace, and a bit more if you are close to a ground pane.

Since the LFXTAL often is the biggest difference between the DK and other PCBs/3rd party modules, I would recommend that you try this. You will have to change this anyway, since the C9 and C10 are too low for the spec.

Best regards,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Wed, 23 May 2018 08:31:07 GMT

Using LFXTAL009678Reel SMD

What is the directory of sdk_config.h ? I can't find in my project folder.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Wed, 23 May 2018 06:36:06 GMT

Oh. Ok. Now I understand. So it works with the DK, but not with the nRF52 module.

Do you use a LFXTAL with your 3rd party module? That is the only change I can think of. I assume that you have the correct pins connected to the TWI while using the target board/module. Either wired up the same pins, or changed the GPIOs in SW.

If you do not have a LFXTAL, what is your RC Oscillator settings (from sdk_config.h)?

Best regards,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Tue, 22 May 2018 12:14:25 GMT

Target board is MDBT42V module (http://www.raytac.com/product_detail.php?id=73) is based on nrf52832 which has LIS3DH & MAX30205 IC .

I2C address for both ICs are correct.

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Tue, 22 May 2018 09:23:24 GMT

which one is the "target board"? The MAX30205?

Do you use the correct TWI/I2C address for the MAX30205?

BR,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Tue, 22 May 2018 06:45:13 GMT

Now, I am getting response from LIS3DH module with x,y,z values using nRF52 DK. But, using same driver I am not getting response from target board:

MDBT42V which has nRF52832

LIS3DH + MAX30205 IC

(Given external pull-ups of 4.7k ohm as well as tried with 10k ohm to i2c bus)

i2c SCL-9, SDA-10 defined same in code & target board

Please suggest how to debug this issue

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Mon, 14 May 2018 12:33:28 GMT

It looks like it was written for one of the older SDKs. SDK13 has a function called app_twi_perform, found in app_twi.c and app_twi.h. It returns an uint32_t (ret_code_t)

Best regards,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Mon, 14 May 2018 09:24:35 GMT

Hi,

Thanks a lot for your suggestions. I tried same way using i2c example given here: https://github.com/Martinsbl/nrf5-mpu-examples/blob/master/nrf_drv_mpu_twi.c

err_code = nrf_drv_twi_tx(&m_twi_instance, LIS3DH_I2C_ADDRESS, &reg, num_regs, false);

in lis3dh_read_regs() & lis3dh_write_regs()

but can't understand these:

transfers[0].p_data = ®
transfers[0].length = 1;
transfers[0].operation = APP_TWI_WRITE_OP(LIS3DH_I2C_ADDRESS);
transfers[0].flags = APP_TWI_NO_STOP;

transfers[1].p_data = contents;
transfers[1].length = num_regs;
transfers[1].operation = APP_TWI_READ_OP(LIS3DH_I2C_ADDRESS);
transfers[1].flags = 0;

return app_twi_perform(ACC_TWI_INSTANCE, transfers, ARRAY_SIZE(transfers), twi_idle_func);

What it is returning? Please explain?

If I call function like lis3dh_read_regs(OUT_X_L, &reg_val, 1) then it should give X value in reg_val ?

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Tue, 08 May 2018 11:51:51 GMT

What is your slave_reg

First of all, you need to init the lis3dh, using the same method as in the github example. Then I suggest you check out how the lis3dh_read_regs() sets up the app_twi_transfer_t structure, and make sure that you get the same when you call.

Like you see in the init function of the github project that you linked to, you need to write to several registers at the lis3dh to initialize it properly.

I suggest you start with looking into the TWI (same as I2C) example in the SDK\examples\peripheral\spim and get familiar with I2C. Then you can try to write to the sensor, and see what you get in return.

Best regards,

Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Tue, 08 May 2018 07:46:26 GMT

status = lis3dh_read_regs(slave_reg, &contents, 1);

Shall I call like this?

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Tue, 08 May 2018 07:41:28 GMT

No. This driver does not have a function called "readXYZ()".

The example that you found on Github. Have you tested it? It seems like this example receives data from the LIS3DH, like you are looking for. I assume you can use the driver that I sent for the readLisReg() and WriteLisReg(). That is, change them to lis3dh_read_regs() and lis3dh_write_regs().

BR,
Edvin

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Vishal Aditya — Tue, 08 May 2018 05:32:46 GMT

So, this (drv_acc_lis3dh.c) will only wake-up LIS3DH. I am not getting any error while compiling your files but I can't find any function to read X,Y,Z values defined in drv_acc_lis3dh.h file:

typedef struct
{
int16_t AXIS_X;
int16_t AXIS_Y;
int16_t AXIS_Z;
} AccAxesRaw_t;

Is driver incomplete? Please suggest me how to read the registers for LIS3DH data like here below:

static uint8_t mosiBuf [2];
static uint8_t misoBuf [2];
void writeLisReg(uint8_t subAddr, uint8_t value)
{
uint32_t err_code;
while(spi_master_get_state(SPI_MASTER_0) != SPI_MASTER_STATE_IDLE);
mosiBuf[0] = subAddr & ~0xc0;
mosiBuf[1] = value;
err_code = spi_master_send_recv(SPI_MASTER_0, mosiBuf, 2, misoBuf,2);
APP_ERROR_CHECK(err_code);
}

uint8_t readLisReg(uint8_t subAddr)
{
uint32_t err_code;
while(spi_master_get_state(SPI_MASTER_0) != SPI_MASTER_STATE_IDLE);
mosiBuf[0] = subAddr | 0x80;
mosiBuf[1] = 0;
misoBuf[0] = 0x55;
misoBuf[1] = 0xAA;
err_code = spi_master_send_recv(SPI_MASTER_0, mosiBuf, 2, misoBuf,2);
APP_ERROR_CHECK(err_code);
while(spi_master_get_state(SPI_MASTER_0) != SPI_MASTER_STATE_IDLE);
return misoBuf[1];
}

void init_lis3dh() {
writeLisReg(LIS3DH_CTRL_REG1, 0x57); //All axes, normal, 100Hz
writeLisReg(LIS3DH_CTRL_REG2, 0x00); // No HighPass filter
writeLisReg(LIS3DH_CTRL_REG3, 0x00); // No interrupts
writeLisReg(LIS3DH_CTRL_REG4, 0x0); // all defaults
writeLisReg(LIS3DH_CTRL_REG5, 0x0); // all defaults
writeLisReg(LIS3DH_CTRL_REG6, 0x0); // all defaults
}

void readLisData()
{
int16_t x,y,z;
double dx, dy, dz;
while(readLisReg(LIS3DH_STATUS_REG) & 0x8 == 0 );
x = readLisReg(LIS3DH_OUT_X_H) * 256 + readLisReg(LIS3DH_OUT_X_L);
y = readLisReg(LIS3DH_OUT_Y_H) * 256 + readLisReg(LIS3DH_OUT_Y_L);
z = readLisReg(LIS3DH_OUT_Z_H) * 256 + readLisReg(LIS3DH_OUT_Z_L);
dx = x/16384.0;
dy = y/16384.0;
dz = z/16384.0;
printf("X: %f; Y: %f; Z: %f; SUM: %f\n\r", dx , dy, dz, sqrt(dx*dx + dy*dy + dz*dz));
}

This is SPI example found here: https://github.com/elmot/nRF51822xxAA-LIS3DH/blob/master/main.c but I need data via i2c communication

RE: Get X,Y,Z values from LIS3DH using nrf52 development board

Edvin — Mon, 07 May 2018 12:22:01 GMT

I see that the projects where the driver is used, it only uses the LIS3DH to wake up the chip from sleep, so maybe the drivers that you initially found would be a better approach.

Can you please specify what kind of issues you see when you try to use it? You say: " I am getting errors like i2c begin". What do you mean by that?

Best regards,

Edvin