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Sara_r · ‎11-01-2020

A supplyment of my last question: I tried writing two bytes into the register INIT_ADDR_0. (e.g I wrote 0xc8, 0x2e) However, the data I read from INIT_ADDR_0 is always 0x24 and 0x21. This is also resulted when I test other registers like INIT_CTRL other than INIT_ADDR_0. Also, if I wrote one byte into INIT_ADDR_0, only the last 6 bit of the data can be write/read. (I wrote 10001000 into INIT_ADDR_0. But I read 001000 from it after that.)

Sara_r · ‎11-01-2020

Hi, I tried using burst write to load the config file 32 bytes at once, but it failed. It looks like my MCU only supports the write/read length of 2 bytes and one byte. So I have two question: 1. Is it okay if I use burst write to load the config file two bytes at once in the while loop? 2. Could you please expain the example code you replied in this post before? Here's the part that confuses me: Wire.beginTransmission(BMI270_ADDR); Wire.write(INIT_ADDR_0); Wire.write(0x00); Wire.write(file_count_); Wire.endTransmission(); Does this mean you wrote both "0x00" and "file_count_" into INIT_ADDR_0 every time when looping?

Sara_r · ‎10-28-2020

Hi, I'm using BMI270 Shuttle board for my project with I2C interface protocol. I have checked my code and seems everything is OK with that. I think something might be wrong with my hardware. Below figure describes my pin connections. The first figure is how I wire the boards. The second figure is from BMI270 datasheet that I'm refering to. The resistors here are both 3.3k Ohms. Also is this connection correct for I2C protocol of BMI270 with address of 0x68?

Sara_r · ‎10-27-2020

Hi, Thanks for your reply! Now I'm using BMI270 API and trying to burst write the 8kb config file at once. So first I changed read_write_len to 8194 which is the size of the config file. Then I put the I2C function in user_i2c_reg_write and user_i2c_reg_write functions with my I2C function in bmi2_common.c. The i2c functions I'm using work well since it returns "HAL_OK". However, when I checked what was actually loaded in 0X5E, the loaded stuff is completely different from the config file. They are like {0x24, 0x21, 0x0, 0x10, 0x00, 0x00, ...} Here's how I changed the bmi2_common.c: /*! * @brief This function is for writing the sensor's registers through I2C bus. */ int8_t user_i2c_reg_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length, void *intf_ptr) { HAL_StatusTypeDef return_value; uint8_t *temp_data = reg_data; // Here I set the BMI270_address to be 0x68 << 1 return_value = HAL_I2C_Mem_Write(&hi2c1, (uint16_t)BMI270_address, (uint16_t)reg_addr, length, temp_data, length, HAL_MAX_DELAY); if(return_value == HAL_OK){ return 0; } /* Write to registers using I2C. Return 0 for a successful execution. */ } /*! * @brief This function is for reading the sensor's registers through I2C bus. */ int8_t user_i2c_reg_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t length, void *intf_ptr) { HAL_StatusTypeDef return_value; return_value = HAL_I2C_Mem_Read(&hi2c1, (uint16_t)(BMI270_address | 0x01), (uint16_t)reg_addr, length, reg_data, length, HAL_MAX_DELAY); if(return_value == HAL_OK){ /* Read from registers using I2C. Return 0 for a successful execution. */ return 0; } }

Sara_r · ‎10-25-2020

I'm using I2C bus to access BMI270 sensor with STM32H7 board. The chip ID of the sensor is read correctly from the register 0x00 with 0x24. I followed the steps of initialization, write_reg(0x7c,0x00), write_reg(0x59, 0x00), as the datasheet written. And these steps look alright since the functions return "HAL_OK" status. Then I used a for loop to burst write the config file that I found in BMI270 API into register 0x5E. I wrote 1 byte from the config file array everytime in the for loop. The writing status of the function I was using is "HAL_OK" as well, which seems alright. Then I wrote 0x01 into the register again like the datasheet said. However, when I read 0x5E (where I loaded the congif file) to check if the config file was burst written correctly, it looked completely different. Could you please help me with this problem? Any guidence would be appreciated! Here is my code HAL_StatusTypeDef return_value; uint8_t addr = 0x7c; uint8_t addr1 = 0x59; uint8_t addr2 = 0x5e; uint8_t addr2_sub = 0x5e; uint8_t addr_chk = 0x21; uint8_t val[1]; val[0] = 0x00; uint8_t val_1[1]; val_1[0] = 0x01; uint8_t return_addr_chk[1]; // write_reg(0x7c, 0x00) return_value = HAL_I2C_Mem_Write(&hi2c1, (uint16_t)(BMI270_address), (uint16_t)addr, 1, val, 1, HAL_MAX_DELAY); if(return_value == HAL_OK){ HAL_Delay(450); // write_reg(0x59, 0x00) Burst write the config file return_value = HAL_I2C_Mem_Write(&hi2c1, (uint16_t)BMI270_address, (uint16_t)addr1, 1, val, 1, HAL_MAX_DELAY); if(return_value ==HAL_OK){ for(uint16_t i=0; i<sizeof(bmi270_config_file); i++){ return_value = HAL_I2C_Mem_Write(&hi2c1, (uint16_t)BMI270_address, (uint16_t)addr2_sub, 1, &bmi270_config_file[i], 1, HAL_MAX_DELAY); if(return_value != HAL_OK){ break; } } } } return_value = HAL_I2C_Mem_Write(&hi2c1, (uint16_t)(BMI270_address), (uint16_t)addr1, 1, val_1, 1, HAL_MAX_DELAY); // write_reg(0x59,0x01) if(return_value != HAL_OK){ HAL_Delay(100); } return_value = HAL_I2C_Mem_Read(&hi2c1, (uint16_t)(BMI270_address|0x01), addr_chk, 1, return_addr_chk, 1, HAL_MAX_DELAY); // read INTERNAL_STATUS uint8_t config_file_check[8192]; return_value = HAL_I2C_Mem_Read(&hi2c1, (uint16_t)(BMI270_address|0x01), 0x5e, sizeof(bmi270_config_file), config_file_check, sizeof(bmi270_config_file), HAL_MAX_DELAY); // check if the file loaded correctly

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About Sara_r

Re: BMI270 Config file load problem

Re: BMI270 Config file load problem

BMI270 Wiring with MCU for I2C Connection

Re: BMI270 Config file load problem

BMI270 Config file load problem

About Sara_r

Re: BMI270 Config file load problem

Re: BMI270 Config file load problem

BMI270 Wiring with MCU for I2C Connection

Re: BMI270 Config file load problem

BMI270 Config file load problem

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