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TOndr
Visitor II
January 7, 2019
Question

Sistick has wrong period

  • January 7, 2019
  • 1 reply
  • 905 views

In HAL_Init(); generated by STMCubeMX

/* Compute TIM1 clock */

 uwTimclock = 2*HAL_RCC_GetPCLK2Freq();

is set to 32000000 instead of 216000000

 /* Compute the prescaler value to have TIM1 counter clock equal to 1MHz */

 uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000) - 1);

prescaler is wrong, 31 instead of 215

What is wrong ?

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1 reply

Tesla DeLorean
Guru
January 7, 2019

Suggests the system believes it is running at 16 MHz (HSi), and your multiplying that by two when the APB clock is in DIV1 mode.​

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Tesla DeLorean
Guru
January 7, 2019

Print out SystemCoreClock etc.

Most likely if HSE doesn't start, then neither will the PLL, and it will stay running for HSI which starts the part, all AHB/APB will be at DIV1

Route internal clocks to PA8/MCO and scope

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