BMI270 initialization issue with bmi2

[Eason]

Hi

I used the official program to initialize BMI270, but there was an error in the initialization program

BMI270_Arduino_example_1:44:10: error: 'struct bmi2_dev' has no member named 'dev_id'

     bmi2.dev_id = BMI270_CS;

#include <SPI.h>

#include <bmi2.h>
#include <bmi270.h>
#include <bmi270_context.h>
#include <bmi2_defs.h>
#include <bmi2_ois.h>
  
#include <Arduino.h>

#define BMI270_CS   SS
#define BMI270_INT1 6



/* Callback function prototypes for the BMI270 Sensor API */

int8_t bmi2_spi_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len);
int8_t bmi2_spi_write(uint8_t dev_id, uint8_t reg_addr, const uint8_t *data, uint16_t len);
void bmi2_delay_us(uint32_t period);

/* Static variables */
static struct bmi2_dev bmi2;
static volatile bool bmi2_intr_recvd = false;
static volatile uint32_t last_time_us = 0;

void setup(void)
{
  int8_t rslt;
  Serial.begin(115200);
  while (!Serial.available()); // Wait for an input to proceed
  pinMode(LED_BUILTIN, OUTPUT);

  /* Use either the SPI or I2C configuration */

  //  /* Start of SPI configuration */
    SPI.begin();
    pinMode(BMI270_CS, OUTPUT);
    digitalWrite(BMI270_CS, LOW);
    delay(1);
    digitalWrite(BMI270_CS, HIGH); // Toggle the chip select to switch into SPI mode
    delay(10);
    
    bmi2.dev_id = BMI270_CS;
    bmi2.read = bmi2_spi_read;
    bmi2.write = bmi2_spi_write;
    bmi2.delay_us = bmi2_delay_us;
    bmi2.intf = BMI2_SPI_INTERFACE;
    bmi2.read_write_len = 8192;
    bmi2.config_file_ptr = NULL; // Use the default BMI270 config file
    /* End of SPI configuration */


  rslt = bmi270_init(&bmi2);
  print_rslt(rslt);

  attachInterrupt(BMI270_INT1, bmi2_intr1_callback, RISING);

  //rslt = configure_sensor(&bmi2);
  //print_rslt(rslt);
}

[BSTRobin]

Hello Eason,

Which example code did you refer? In struct bmi2_dev, it has no dev_id member:

bmi2_defs.h

/*! Structure to define BMI2 sensor configurations */
struct bmi2_dev
{
/*! Chip id of BMI2 */
uint8_t chip_id;

/*! The interface pointer is used to enable the user
* to link their interface descriptors for reference during the
* implementation of the read and write interfaces to the
* hardware.
*/
void *intf_ptr;

/*! To store warnings */
uint8_t info;

/*! Type of Interface */
enum bmi2_intf intf;

/*! To store interface pointer error */
BMI2_INTF_RETURN_TYPE intf_rslt;

/*! For switching from I2C to SPI */
uint8_t dummy_byte;

/*! Resolution for FOC */
uint8_t resolution;

/*! User set read/write length */
uint16_t read_write_len;

/*! Pointer to the configuration data buffer address */
const uint8_t *config_file_ptr;

/*! To define maximum page number */
uint8_t page_max;

/*! To define maximum number of input sensors/features */
uint8_t input_sens;

/*! To define maximum number of output sensors/features */
uint8_t out_sens;

/*! Indicate manual enable for auxiliary communication */
uint8_t aux_man_en;

/*! Defines manual read burst length for auxiliary communication */
uint8_t aux_man_rd_burst_len;

/*! Array of feature input configuration structure */
const struct bmi2_feature_config *feat_config;

/*! Array of feature output configuration structure */
const struct bmi2_feature_config *feat_output;

/*! Structure to maintain a copy of feature out_conf values */
struct bmi2_int_map int_map;

/*! Structure to maintain a copy of the re-mapped axis */
struct bmi2_axes_remap remap;

/*! Flag to hold enable status of sensors */
uint64_t sens_en_stat;

/*! Read function pointer */
bmi2_read_fptr_t read;

/*! Write function pointer */
bmi2_write_fptr_t write;

/*! Delay function pointer */
bmi2_delay_fptr_t delay_us;

/*! To store the gyroscope cross sensitivity value */
int16_t gyr_cross_sens_zx;

/* gyro enable status, used as a flag in CRT enabling and aborting */
uint8_t gyro_en : 1;

/* advance power saving mode status, used as a flag in CRT enabling and aborting */
uint8_t aps_status;

/* used as a flag to enable variant specific features like crt */
uint16_t variant_feature;

/* To store hold the size of config file */
uint16_t config_size;

/*! Function pointer to get wakeup configurations */
bmi2_wake_up_fptr_t get_wakeup_config;

/*! Function pointer to set wakeup configurations */
bmi2_wake_up_fptr_t set_wakeup_config;
};

[Eason]

I use BMI270_Arduino_example.ino from  with Ardduino Meaga 2560 . Besides this, there is an error saying that the global variables are taking up 115% of dynamic memory.

[Minhwan]

Hello Eason, 

Some our arduino code is old fashioned, so I migrated our new API into Arduino DUE. 

Please let me know if you have further questions. 

Thanks 🙂 

[BSTRobin]

Hello Eason,

In your application code, the value 8192 for read_write_len was too high.This value needed to be set according maximum length of MCU SPI HW.

I used value 32 for read_write_len on STM32.

 bmi2.read_write_len = 8192;