ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

Simonr — Thu, 16 Sep 2021 07:50:45 GMT

My French is rather rusty, so I'm sorry if something was lost in translation. I'd appreciate it if you would keep replies on DevZone to English.

1. Check out the Startup sequence and the control registers (CTRL_REG) in the LIS3DH app note to make sure your device is configured correctly. You could also use a multimeter to measure if there's any activity on the lines between the nRF52 and the LIS3DH.

2. Okay, good.

3. I think the reason that you're only seeing 0s from the accelerometer is that it isn't configured correctly, and thus doesn't actually send data to the nRF52. The only way to be certain is to check the TWI lines whether there is any activity there.

Best regards,

Simon

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

rh.amine — Tue, 14 Sep 2021 11:19:49 GMT

Salut Simon

You might have to write something to the sensor in order to get anything back.

how can I validate the functioning of LIS3DH ??

Êtes-vous sûr de suivre le protocole de communication TWI décrit dans la fiche technique de l'appareil ?

Oui je suis sûr

Avez-vous un analyseur logique pour voir s'il y a une quelconque activité sur les lignes TWI ?

je n'ai pas

Pouvez-vous m'expliquer pourquoi les trois variables suivantes renvoient toujours 0

tmp_int16[ 0] = (int16_t)((tmp[1]<< 8) | tmp[0]); 0
tmp_int16 [1] = (int16_t)((tmp[3]<< 8) | tmp[2]); 0
tmp_int16 [2] = (int16_t)((tmp[5]<< 8) | tmp[4]); 0

si tmp_int16 [ 0] est toujours 0

donc acc[0] 0

voici ma fonction

void LIS3DH_GetAccData(float *acc)
{
uint8_t tmp[6] = {0};
int16_t tmp_int16[3] = {0};
état uint8_t = 0 ;

//vérification des données prêtes ?
i2c_read(LIS3DH_I2C_ADDRESS ,(LIS3DH_REGISTER_STATUS_REG2), &status, 0x01);
if(status & LIS3DH_STATUS_REG_ZYXDA)
{
i2c_read(LIS3DH_I2C_ADDRESS ,(LIS3DH_REGISTER_OUT_X_L | LIS3DH_READ_MULTI_BYTES), tmp, 0x06);
tmp_int16[0] = (int16_t)((tmp[1]<< 8) | tmp[0]);
tmp_int16[1] = (int16_t)((tmp[3]<< 8) | tmp[2]);
tmp_int16[2] = (int16_t)((tmp[5]<< 8) | tmp[4]);

acc[0] = (float)(tmp_int16[0]) * LIS3DH_ACC_CONVERT_8G;
acc[1] = (float)(tmp_int16[1]) * LIS3DH_ACC_CONVERT_8G;
acc[2] = (float)(tmp_int16[2]) * LIS3DH_ACC_CONVERT_8G;

}

Meilleures salutations,

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

Simonr — Tue, 14 Sep 2021 06:48:12 GMT

You might have to write something to the sensor in order to get anything back. Are you sure you're following the TWI communication protocol described in the datasheet of the device? It seems to me like your nRF device is able to operate over BLE and UART as intended, and that only the TWI is problematic on your end.

Do you have a logic analyzer so you can see whether there's any activity on the TWI lines at all?

Best regards,

Simon

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

rh.amine — Mon, 13 Sep 2021 09:07:40 GMT

Hi Simon

Is there a battery in the device you're using powering the device?

I'm sure the device is powered by a button battery.

Best regards,

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

Simonr — Mon, 13 Sep 2021 07:21:21 GMT

Is there a battery in the device you're using powering the device? The J-Link will not be sufficient to power the nRF by itself, so if not it won't be running properly. And are you sure the LIS3DH is powered properly, as I'd imagine only printing 0's would point to the device not being powered.

Best regards,

Simon

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

rh.amine — Fri, 10 Sep 2021 09:26:20 GMT

thank you so much for helping me Simon

Is the device running normally except the incorrect TWI values?

no does not work, I tested it with TWI, because in the hardware shema the LIS3DH is connected with SDA and SCL.

Please note that v7.0.1 and v7.2.0 are the SoftDevice versions that have been tested with the nRF52805

ok I will create another project which is based on SDK17.02 which contains SDv7.2.0

How are you powering the board and set it up?

1.I am using J-link and IDE SEGGER

Can you confirm what lines of code are returning/printing these zeroes?

2.I am using UART BLE to retrieve values

3.BEACON has:

-NRF52805

-BUZZER (works)

-LED (works)

-BUTTON (works)

-LIS3DH (does not work)

void LIS3DH_GetAccData(float *acc)
{
uint8_t tmp[6] = {0};
int16_t tmp_int16[3] = {0};
uint8_t status = 0;

//check data ready?
i2c_read(LIS3DH_I2C_ADDRESS ,(LIS3DH_REGISTER_STATUS_REG2), &status, 0x01);
if(status & LIS3DH_STATUS_REG_ZYXDA)
{
i2c_read(LIS3DH_I2C_ADDRESS ,(LIS3DH_REGISTER_OUT_X_L | LIS3DH_READ_MULTI_BYTES), tmp, 0x06);
tmp_int16[0] = (int16_t)((tmp[1]<< 8) | tmp[0]);
tmp_int16[1] = (int16_t)((tmp[3]<< 8) | tmp[2]);
tmp_int16[2] = (int16_t)((tmp[5]<< 8) | tmp[4]);

acc[0] = (float)(tmp_int16[0]) * LIS3DH_ACC_CONVERT_8G;
acc[1] = (float)(tmp_int16[1]) * LIS3DH_ACC_CONVERT_8G;
acc[2] = (float)(tmp_int16[2]) * LIS3DH_ACC_CONVERT_8G;
}

}

you can understand me how i2c works and how to read the bits in the registers ??????????????

i2c_write()

i2c_read()

Best regards,

Amine

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

Simonr — Fri, 10 Sep 2021 07:05:22 GMT

Is the device running normally except the incorrect TWI values? Please note that v7.0.1 and v7.2.0 are the SoftDevice versions that have been tested with the nRF52805. How are you powering the board and set it up? Have you checked out the LIS3DH application note here? I'm not able to see any issue in your code by looking at it. Can you confirm what lines of code are returning/printing these zeroes?

Best regards,

Simon

RE: ble app uart + I2C + LIS3DH Acc Output X,Y,Z values always remain 0 even if I have moved the BEACON .

rh.amine — Wed, 08 Sep 2021 14:16:13 GMT

Hi SImon

I answered your questions.

devzone.nordicsemi.com/.../nrf52805-ble-app-uart-i2c-lis3dh-acc-output-x-y-z-values-from-lis3dh-0

Best regards,