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Forum Posts

What's the role of CPOL in I2S?

Posted on September 27, 2017 at 22:10Clocks in the I2S diagrams in STM32F4xx DS show two settings of CPOL, although the difference appears to be minor:Also caption of several figures in I2S portion of the SPI/I2S chapter in RM0090 contain CPOL=0.How...

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Internal flash vs. RAM execution speed

Posted on December 24, 2017 at 19:54The manuals mention 'ART accelerator allowing 0-wait state execution'.Do all STM32 models run off the internal flash at maximum speed? Would code copied to RAM run faster?-- pa#performance

Pavel A. by Super User
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Resolved! Why RTC backup register write fails? (STM32F446)

Posted on January 02, 2018 at 21:01(this is re-post because of the 'forums issue')I have the following function to write a RTC backup register of 446ZCT:All RTC initialization code is generated by CubeMX.void put_backup_num(uint8_t num){  __HAL_RTC_...

Pavel A. by Super User
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Resolved! Arduino with Nucleo STM32F207ZG

Posted on December 02, 2017 at 09:38Hello guysI want check the STM32F207ZG can run with arduino. But the F207ZG is too big ,144 pins .We plan to use F207VG  100pins,  it is can run complaint with arduino ?Is there anything to change ?  #arduino-stm3...

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Sinwave harmonics on STM32F4 discovery board

Posted on January 02, 2018 at 06:26Hello,I am generating digital sin wave sample using the below formula.sin wave[numberOfSample]=2047*(sin(2*3.14*n/numberOfSample)+1)I am generating sample for 200 hertz wave.numberOfSample=40 when sampling frequenc...

Difference between RTC calibration output 1 Hz and 512 Hz

Posted on January 03, 2018 at 10:22Hi,I'm using a STM32L496VG, with an external LSE of 32768 Hz. I configure the RTC this way:/* Enable Power Control clock */__HAL_RCC_PWR_CLK_ENABLE();/* Enable writing RTC back-up registers */HAL_PWR_EnableBkUpAcce...

ADC with DMA FIFO Circular mode Memory Config Doubt

Posted on January 03, 2018 at 08:27Hi Everyone,Am using STM32F407 MCUI have 6 adc channels configured as in ADC scan mode with DMA.first sequence value repeated for next 3 sequences.and 5 sequence value repeat in the sixth sequence.I have doubt in t...

Random CAN Clock

Posted on December 29, 2017 at 21:52Hello, I'm trying to bring up CAN on the STM32F303RE.  After banging my head against the wall, and with much help from the forum, I'm getting closer.  What I notice is that the CAN clock is not repeatable from pow...