BMI270 initialization issue with Arduino M0

[Menedee]

Hi,
II have to reopen this thread because actually I am having a similar problem.
I couldn't change the library in the way you mentioned to get arduino code compiled.
Could you post/attach the part of the library you have changed?

The message I received after compiling is same as yours:

BMI270-Sensor-API-bmi270_v2.46.1/bmi2.h:1341:2: error: #endif without #if

 #endif /* BMI2_H_ */

I am also able able to detect correct chip ID (0x24) but accelerometer output independet of axis is still zero.

[paraas]

Hi,

I'm also trying to get the config file loaded correctly. Copied your gist example code into arduino, but it gives me error "'struct bmi2_dev' has no member named 'dev_id'"  on line 61 and "'BMI2_I2C_INTERFACE' was not declared in this scope " on line 65. Not sure how to fix this.

Any help appreciated. 

Best regards.

[Minhwan]

Hello, 

We used dev_id in previous API, but not anymore. 

Please test with my attached file. 

Thanks 🙂  

[paraas]

Hi again, thanks for the quick reply 🙂

I forgot to write that I am trying to communicate via I2C to a Teensy 3.2 MCU. I tried changing your program to enable I2C and it doesn't give any errors, but the serial moniter isn't showing anything (not even the "bmi270_init done" in setup()). 

There are some warnings when declaring bmi2.read and bm2.write, but I can't get rid of them. Is there a similar example for I2C?

I've attached the program where I tried to enable I2C.

Best regards.

[Minhwan · Accepted solution]

Hello paraas, 

Unfortuantely, we don't have example code for Teensy 3.2 MCU. 

However, here is the my i2c example for arduino. 

bmi2xy_hal_i2c_bus_read and bmi2xy_hal_i2c_bus_write are put to bmi2 function pointers as below. 

Thanks,

bmi2.read = bmi2xy_hal_i2c_bus_read;
bmi2.write = bmi2xy_hal_i2c_bus_write;

/*! This API is used to perform I2C read operation with sensor */
int8_t bmi2xy_hal_i2c_bus_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t length, void *intf_ptr)
{
int8_t rslt = 0;
//uint8_t dev_id = 0x68;
uint8_t* dev_id = (uint8_t *)intf_ptr;

rslt = BMI270_read_i2c(*dev_id, reg_addr, reg_data, length);

return rslt;
}

/*! This API is used to perform I2C write operations with sensor */
int8_t bmi2xy_hal_i2c_bus_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length, void *intf_ptr)
{
int8_t rslt = 0;
// uint8_t dev_id = 0x68;

uint8_t* dev_id = (uint8_t *)intf_ptr;
rslt = BMI270_write_i2c(*dev_id, reg_addr, (uint8_t *)reg_data, length);

return rslt;
}

int8_t BMI270_read_i2c(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t count)
{
/* dev_addr: I2C device address.
reg_addr: Starting address for writing the data.
reg_data: Data to be written.
count: Number of bytes to write */
// Begin I2C communication with provided I2C address
Wire.beginTransmission(dev_addr);
Wire.write(reg_addr);
// Done writting, end the transmission
int8_t returned = Wire.endTransmission();

if (returned)
{
return returned;
}

// Requests the required number of bytes from the sensor
Wire.requestFrom((int)dev_addr, (int)count);

uint16_t i;
// Reads the requested number of bytes into the provided array
for (i = 0; (i < count) && Wire.available(); i++)
{
reg_data[i] = Wire.read(); // This is for the modern Wire library
}

// This must return 0 on success, any other value will be interpreted as a communication failure.
return 0;
}

int8_t BMI270_write_i2c(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t count)
{
/* dev_addr: I2C device address.
reg_addr: Starting address for reading the data.
reg_data: Buffer to take up the read data.
count: Number of bytes to read. */
// Begin I2C communication with provided I2C address
Wire.beginTransmission(dev_addr);
Wire.write(reg_addr);

uint16_t i;
// Writes the requested number of bytes from the provided array
for (i = 0; i < count; i++)
{
Wire.write(reg_data[i]); // This is for the modern Wire library
}
// Done writting, end the transmission
int8_t returned = Wire.endTransmission();
return returned;
}