STM32- F103 model I2C different result in Debugger vs Run

[farrokhiyan]

Hi friends,

I'm working on data exchange between my stm32-F103 and atmel AT24C02 serial EEPROM on my starter board. I have did the programming based on I2C peripheral and DMA. the pull ups are 4.7 k. when I debug the program the result is fine and the data inside the EEPROM come out but when I exit from debug mode and run the micro normally the answer is disappointing. The program loops in checking the event I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED. the DMA TC flag doesn't set. I put some delays but it had no effect. I've read in a forum that the problem is the pull ups. Is 4.7k low? What is the difference between debug and run? What may cause this?

 

[ud23]

try to build and compile your code as release rather then debug and pull up might be issue and try to change your pull up.

 

[Easyrider83]

Without code it is hard to say something. What is a point of using DMA? It is a very small size eeprom. If you don't want to use RTOS, best way is to use interrupt transmition, if multitasking needed. If not, pooling, sure.