Resolved! stm32f4xx_hal_rcc_ex.c invalid non shifted comparison
STM32F411. Line 2693: srcclk = __HAL_RCC_GET_I2S_SOURCE();That macro calls "READ_BIT" on the I2SSRC register bit.It does NOT shift it right 23U.The function then compares this to 0 or 1.FAIL.Result. I2S cannot be configured to use an external clo...