STM32F4 - MPU-6050 cannot communicate ...

[aybala5]

Posted on May 31, 2014 at 21:37

Hello Friends,

I bought stm32f4 discv. board and also http://www.aliexpress.com/item/1-pcs-MPU-6050-Module-3-Axis-Gyroscope-Accelerometer-Module-for-Arduino-MPU-6050-Worldwide-FreeShipping/1361575363.html board but i havent get it worked yet; my 3 different codes hangs  at  same code line  while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); I simply use 4 wire : VCC -->3V GND -->GND SCL--> PB6 SDA-->PB9 can someone help me thnks. Mustafa

[Tesla DeLorean]

Posted on May 31, 2014 at 22:01

can someone help me thnks.

Be sure that the I2C slave address is correct. The 7-bit address goes in the high-order 7-bits of the byte. Check you get an ACK signal with a scope or logic analyzer.

[aybala5]

Posted on May 31, 2014 at 22:14

Thank you Mr Clive.,

How can i be sure for the slave adrees of the cheap aliexpress product i send email to seller but not sure whether he can send me correct information. Like many i used library; #define MPU6050_ADDRESS_AD0_LOW     0x68 // address pin low (GND), default for InvenSense evaluation board #define MPU6050_ADDRESS_AD0_HIGH    0x69 // address pin high (VCC) #define MPU6050_DEFAULT_ADDRESS     (MPU6050_ADDRESS_AD0_LOW<<1)   and guessed 0x68 , i have no logic analyzer or event a multimeter. Find many code but all stuckt at same line. Dont know how to progress ...

[Tesla DeLorean]

Posted on May 31, 2014 at 23:48

I don't see a schematic, so will assume AD0 has that 4K7 pull down, and SDA/SCL have the 2K2 pull-up.

Looks to have an LDO, consider finding the 3V3 supply on the the DISCO, or the 5V one. The address as sent by the STM32 should be (0x68 << 1), I don't see enough code to confirm that. You'd want to make sure the pins you have used are not conflicted on the STM32F4-DISCO Make sure the I2C clocks are running. You can look at the signals, you can look at the code.

http://www.google.com/search?q=gy-521