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[HELP] I2C LCD with STM32F4-07VG and CooCox

Thread starter #1
Hello all. I have a problem with my lcd. I use it on our robot to see a parameters on robot with STM32F4-07VG board.

I used lcd 4x20 with i2c wiring and pcf8574 module and also coocox to program it with library from www.stm32f4-discovery.net

The problem is, the lcd is often send the random data (not like there isn't same the baudrate), the text is running random from up to bottom. So i have to reset the board so the lcd will display right text and static text (not running text).

I dont know there is problem with my program or my wiring lcd. Because the case is randomly happen. Sometimes it's happen when the robot have a tremble, sometimes it's happen when the robot is motionless.

Maybe someone know about this problem and can explain to me, thanks :)

*video/pic when the lcd error is come afterward
 
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