Posted on September 14, 2014 at 11:31I'm using the st-link on stm32f4 discovery. I had upgrated the firmware to V2.J21.S0, and there's something wrong when using the printf via SWO. The printf data number inceases fast but there is no data shown in ...

Posted on September 13, 2014 at 22:14I'v found in the Cortex-M4 file that the default value of PRIGROUP is 0. while the legal value of STM32 is from 3 to 7. And I didn't find the PRIGROUP set in startup file or system_stm32f4xx.c. What is the defaul...

Posted on February 25, 2014 at 16:45I found this problem when debug the CAN bus. The received data can not be showned in the printf via SWO. At first I thought there were something wrong in configuraion. But at last I found that the data can be show...

Posted on July 21, 2013 at 17:39In the register description in the page 516 of STM32F4 reference manual, there are no OPM bit in CR1 of TIM10/11/13/14, but the description says nothing about it doesn't support this feature, and the function TIM_Sele...

Posted on January 02, 2013 at 22:01I was using the stm32f10x USB device lib 3.4, and with the callback function Class_Data_Setup, class-specific requests with data in stage(from MCU to PC) can be implemented, but how to implement class-specific requ...