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Forum Posts

usart1 and usart2 contention

Posted on July 15, 2014 at 17:19Hello again. I've two usarts in use on my board. One, Usart1 is connected to the console and the other usart2 is connected to a modem chip. When I enable the usart2 interrupt using the NVIC commands, there is no outpu...

How to convert the systick to ns ?

Posted on July 15, 2014 at 16:18DearI have read Ch14.1 Systicks the definition guide of Cortex M3 2nd. But I still confuse it. If I take the Systicks Reload = 65536, the corresponding time is 65536 * 168 MHz * 1e9 ?Am I correct?  Thanks 

gapryun by Associate II
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How to convert the DWT CYCCNT to ns ?

Posted on July 15, 2014 at 17:26DearI have read Ch16.2 Trace component DWT, the definition guide of Cortex M3 2nd. But I still confuse it. If I take the CYCCNT, the corresponding time is CYCCNT * 168 MHz * 1e9 ?Am I correct?  Thanks 

gapryun by Associate II
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STM32 compiled code addresses at 0x0 not 0x08000000

Posted on July 15, 2014 at 14:57Hi all,I saw that the current practice is to compile all code at 0x08000000 offset. This is fine for me, but now I have an application with a lot of constant tables in flash, and more important, a ''host'' application...

raimond by Associate III
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GDB became very slow in CoIde

Posted on July 15, 2014 at 12:03 Hi everyone, I'm working on a STM32F427 with CoIde on Windows Vista for a long time now without any issue. Since yesterday my debugger became very slow, very very slow. when i hit the ''pause'' button it takes approx...

benoit2 by Associate II
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DMA2 problems: NDTR not zero

Posted on July 09, 2014 at 18:40I'm having some problems with DMA transfers apparently stalling on our STM32F405ZGT6 board. The problem seems to only happen when I have multiple streams running. So, I have Stream3 using SDIO, with 32 bit wide access...

STM32F3 Discovery power circuit heating up

Posted on July 14, 2014 at 00:01I was testing my STM32F3Discovery with an external 5V power supply (generic 5V 2A wall plug), and after about 30 seconds it stopped operating (LED flashing demo stopped flashing), and soon after I smelled something bu...