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Enable USB Clock Source Freezes Execution

Question asked by Richard Lowe on Apr 30, 2018
Latest reply on May 16, 2018 by Nawres GHARBI

Simple demo application on the Nucleo-L476RG generated in CubeMX with HAL version 1.11. Nothing but USB Host and a few GPIOs for LEDs enabled.


When it comes to the `SystemClock_Config()` it freezes when enabling the clock source for the USB.


if(PeriphClkInit->UsbClockSelection == RCC_USBCLKSOURCE_PLLSAI1)
        /* PLLSAI1 input clock, parameters M, N & Q configuration and clock output (PLLSAI1ClockOut) */
        ret = RCCEx_PLLSAI1_Config(&(PeriphClkInit->PLLSAI1), DIVIDER_Q_UPDATE);

        if(ret != HAL_OK)


`ret` is always `HAL_ERROR` which causes an infinite loop at:


if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
    _Error_Handler(__FILE__, __LINE__);


Just wondering if I have a hardware issue or something I missed in clock initialization.