Posted on May 17, 2011 at 13:45Thanks Anis,it's all right with stm32f103b.Slim

Posted on May 17, 2011 at 13:45in compiling, i have found the following message in infinite loop ''Usage fault: attempt to use a coprocessor instruction''.wheras, ''coprocessor instructions are not supported on the Cortex-M3.'' and I've not used any...

Posted on May 17, 2011 at 13:45Hi Alex,What do you mean by ttl <> USB, are you using USB/USART adapter between host and target ?Slim

Posted on May 17, 2011 at 13:43Hi Edison,Would you explain this with more details please?Slim

Posted on May 17, 2011 at 13:43I have implemented this source code to benchmark the jitter of 10 ms delay:/* clcok config: HCLK = SYSCLK  */RCC_HCLKConfig(RCC_SYSCLK_Div1);/* clcok config: PCLK1 = HCLK/2  */RCC_PCLK1Config(RCC_HCLK_Div2);RCC_APB1Per...