About mra

I am interfacing with the BHI260AB shuttle board over I2C using a Cortex M0 as the host MCU (Adafruit Feather M0 board). I use the 'load_firmware.c' example code provided with the BHY2 Sensor API to upload firmware to the external flash chip on the shuttle board. The firmware file I included in my code is the 'Bosch_SHUTTLE_BHI260_BMM150-flash.fw.h' file supplied with the BHY2 Sensor API. After uploading the firmware and booting the BHI260AB from flash, the Error Value register reports a 0x12 error ("SHA hash mismatch") and the Boot Status register activates the 'Flash Verify Error' bit. I have made the following modifications to the example code: Changed to I2C interface Included custom functions for I2C read & write operations and a delay function Removed lines relating to COINES Replaced printf statements with appropriate printing statements for the Arduino framework Included a check on the result of the bhy2_upload_firmware_to_flash_partly function to ensure that the firmware is being received Decreased the size of the increment in the 'upload_firmware' function to 200, because the default 256 increment leads to a timeout error I have also created an alternative firmware file using the BHI260 SDK, using the default configuration that comes with the SDK. At 1 point this firmware was uploaded correctly and after booting from flash a valid kernel version was reported, but at the next attempt with the exact same code and firmware it reported the SHA hash mismatch again. I am suspecting that some bytes are getting lost in data transfer to the flash chip, but I have no clue what could cause that. Any possible clues are appreciated! For reference, these are my I2C read and write functions: int8_t user_i2c_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, void *ptr) {     uint16_t ndone = 0;     uint8_t nread;     uint8_t stop = 0;     Wire.beginTransmission(BHI_I2C_address);     Wire.write(reg_addr);     Wire.endTransmission();     while (ndone < len) {       nread = min(255,len-ndone);       ndone += nread;       if (ndone == len) {         stop = 1;       }       Wire.requestFrom(BHI_I2C_address,nread,stop);       for (uint8_t i = 0; i < nread; i++) {         *reg_data = Wire.read();         reg_data++;       }     }          return 0; } int8_t user_i2c_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t len, void *ptr) {     Wire.beginTransmission(BHI_I2C_address);     Wire.write(reg_addr);     while (len--) {       Wire.write(*reg_data);       reg_data++;     }          Wire.endTransmission();          return 0; } ... View more

I have a BMX160 interfacing with an 8-bit AVR processor (the ATmega328p). I would like to apply sensor fusion to the BMX160 data using the BSX Lite library. After downloading the library, it seems to me that it is only compatible with cortex M3 or M4 processors. Is there a version of BSX Lite (or BSX full for that matter) that would run on an 8-bit AVR processor? If the answer is no, what about compatibility with cortex M0? I know that the BNO055 can do that for me already, but I'd prefer to run the BSX library myself on an M0. ... View more