STM32F051C6 works properly only in debug run mode

[ageofenigma]

Posted on September 27, 2014 at 18:16

MCU  (STM32F051C6) gets data from ADC via SPI and then sends  it to the I2C master (with DMA help) (Raspberry PI). When i stop debugging and reset chip it starts working in a bad way. No data from ADC, only one 32 bytes package (.read_i2c_block_data  python function) once after reset  and no data anymore, nevertheless GPIOs work and external interrupts as well.  MCU freq. 4Mhz (HSE) * 2 PLL but i tried several variants. It still doesn't work. Have anyone encountered the same problem?

#stm32f051 #problem

[Tesla DeLorean]

Posted on September 28, 2014 at 14:43

Have anyone encountered the same problem?

No, but do I have too? Make sure you have all the peripheral and bus clocked enabled that you need, the debugger may enable things to do it's own work. If you have a serial output consider outputting diagnostic/telemetry data so you can better understand what's going on internally.