STM32 MCUs Products

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Forum Posts

STM32F7 Ehternert port

Posted on August 31, 2016 at 16:03Hi, I have a custom board with Ethernet using the STM32F4 and the KSZ8051RNL Phy from Micrel working in RMII mode. The firmware is based on the LWIP TCP server example from the std. periphery library using a raw com...

devcal by Associate II
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  • 1 replies
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STM32F4 - Reinitializing I2C driver

Posted on September 07, 2016 at 09:41Hi, I'm trying to deinit and then init the I2C driver during runtime of the STM32F411. I2C1 generally works when initializing the drivers once, but when I deinit and then init them, I get a start-bit timeout - th...

gkovelman by Associate II
  • 1255 Views
  • 1 replies
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Nucleo external 32khz clock.

Posted on September 06, 2016 at 03:15Hi Everyone.I'm having trouble starting the external 32khz RTC source as fitted to the Nucleo. Are there any issues with this clock on the Nucleo, has anyone got it to work?ThanksMartin

mbmail4 by Associate II
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  • 7 replies
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SDADC problem in single-ended mode.

Posted on September 04, 2016 at 10:02Hi,I meet a problem with my project in which a STM32F373 MCU is used to collect singnal in single-ended mode.I short the pin with GND to test the board,the ADC values I get seems to fluctuate like saw-tooth.The g...

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txmsszd by Associate II
  • 1864 Views
  • 10 replies
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How to handle overflows in a register like DWT_CYCCNT

Posted on September 06, 2016 at 20:40There are examples counting clock pulses with the DWT_CYCCNT, but it will overflow in time. Counting pulses is easy if there is no overflow, but with overflow I am sure there nice way of doing it. I could do some...

LMI2 by Lead
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  • 5 replies
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Reading the device type in user software

Posted on September 06, 2016 at 21:37Is it possible to read the device type in user code?  I would like to write some code that uses the crypto acceleration hardware if it is running on an STM32F415 and falls back to software implementations if it i...

ron2399 by Associate II
  • 407 Views
  • 1 replies
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How to print unsigned int always positive

Posted on September 06, 2016 at 18:47 This is more of a C problem than Arm problem, here too are some people who know their C. I am reading the value of DWT_CYCCNT; When print it via Uart, after a while it becomes negative. The most ...

LMI2 by Lead
  • 577 Views
  • 3 replies
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Embedded bootloader

Posted on September 05, 2016 at 17:54I am messing around with the SMT32F429 discovery EVK. I am trying to play with booting into the internal bootloader and may have blown it away. Using IAR workbench I look at the device's memory location 0x1fff000...