deamonata

what is register 97 showing when you read it?

-65,535 to 65536 would be the range of a 32 bit int (long). hmm bit strange that it is capping out at 255 do you have a logic analyser, it would be useful to sniff the data line and see what the data is that you are getting from the L3G4200D

it sounds like you are using a unsigned short type variable, It would be strange for you to be getting such a perfect range otherwise. I would assume that you would be better of using a signed int data type that would give you a range of -32768 to 32767.

I'm currently trying to understand the 6 axis dmp on the mpu-9150. my end application is to communicate with the mpu-9150 from a SiLab C8015F411 microcontroller. I can currently obtain the raw values from the sensor however it would be much more useful if I could obtain heading data. I've been trying to make sense of what the arduino dmp code is doing, however I've not be making much head way. I was wondering if anyone could give me a DMP-101 lesson on how to get it working. Thanks in advance

do you have a logic analyser or failing that a good occiloscope? if you do it would be worth checking to see if you are getting an acknowledge from either of them

I was writing to every register because my code wasn't working when I was only writing a few settings to it, but I thought that maybe one wan't initialising properly. However it turns out the problem was with the chip and having replaced the chip I can now read from the accelerometer and gyroscope, but the magnometer is still causing me issues. I've determined that I should be at the address 0x0C, and I sent 0x01 to the register 0x0A before reading anything. however all I am getting back are zeros. what are the steps that I should be doing to read from the magnometer? I assume I must be missing something.

Hi there, I've been having a lot of issues with the 9150, I attempting to interface between a C8051F411 and the MPU-9150. I have successfully inmplemented the I2C buss communication and can talk to the device, I can comfortably read and write to most registers however if I read and write to the accel/gyro sensor registers all I get back is zeros. Obviously my first thought was the sleep mode, however I check and I am deffinatly setting the PWR_MGMT_1 register to 0x02 in my code, and more importantly if I read the register back to check the value I can confirm it has been set correctly. I set the following registers SMB_Write_To_Register (REG_PWR_MGMT_1, PWR_MGMT_1_RESET); // resets the chip for (i=0;i<20000;i++); SMB_Write_To_Register (PWR_MGMT_1, 0x02); for (i=0;i<20000;i++); SMB_Write_To_Register (SMPRT_DIV, 0x07); SMB_Write_To_Register (CONFIG, 0x00); SMB_Write_To_Register (GYRO_CONFIG, 0x00); SMB_Write_To_Register (ACCEL_CONFIG, 0x00); SMB_Write_To_Register (FF_THR, 0x00); SMB_Write_To_Register (FF_DUR, 0x00); SMB_Write_To_Register (MOT_THR, 0x00); SMB_Write_To_Register (MOT_DUR, 0x00); SMB_Write_To_Register (ZRMOT_THR, 0x00); SMB_Write_To_Register (ZRMOT_DUR, 0x00); SMB_Write_To_Register (FIFO_EN, 0x00); SMB_Write_To_Register (I2C_MST_CTRL, 0x00); SMB_Write_To_Register (I2C_SLV0_ADDR, 0x00); SMB_Write_To_Register (I2C_SLV0_REG, 0x00); SMB_Write_To_Register (I2C_SLV0_CTRL, 0x00); SMB_Write_To_Register (I2C_SLV1_ADDR, 0x00); SMB_Write_To_Register (I2C_SLV1_REG, 0x00); SMB_Write_To_Register (I2C_SLV1_CTRL, 0x00); SMB_Write_To_Register (I2C_SLV2_ADDR, 0x00); SMB_Write_To_Register (I2C_SLV2_REG, 0x00); SMB_Write_To_Register (I2C_SLV2_CTRL, 0x00); SMB_Write_To_Register (I2C_SLV3_ADDR, 0x00); SMB_Write_To_Register (I2C_SLV3_REG, 0x00); SMB_Write_To_Register (I2C_SLV3_CTRL, 0x00); SMB_Write_To_Register (I2C_SLV4_ADDR, 0x00); SMB_Write_To_Register (I2C_SLV4_REG, 0x00); SMB_Write_To_Register (I2C_SLV4_DO, 0x00); SMB_Write_To_Register (I2C_SLV4_CTRL, 0x00); SMB_Write_To_Register (INT_PIN_CFG, 0x00); SMB_Write_To_Register (INT_ENABLE, 0x00); SMB_Write_To_Register (I2C_SLV0_DO, 0x00); SMB_Write_To_Register (I2C_SLV1_DO, 0x00); SMB_Write_To_Register (I2C_SLV2_DO, 0x00); SMB_Write_To_Register (I2C_SLV3_DO, 0x00); SMB_Write_To_Register (I2C_MST_DELAY_CTRL, 0x00); SMB_Write_To_Register (SIGNAL_PATH_RESET, 0x00); SMB_Write_To_Register (MOT_DETECT_CTRL, 0x00); SMB_Write_To_Register (USER_CTRL, 0x00); SMB_Write_To_Register (PWR_MGMT_2, 0x00); SMB_Write_To_Register (FIFO_R_W, 0x00); The logic analyzer I have confirms that everything is getting sent correctly and I am getting acknowleges back from the MPU-9150. I've kinda run out of ideas now as to why it isn't working