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STM32F103XB: TIM2 CH1 on PA15 conflicts with SPI1 NSS

Question asked by Kolja Waschk on Jan 9, 2018



Using CubeMX, I configured SPI1 on a STM32F103T8Ux as full-duplex master mapped on PB3..PB5, with hardware NSS (on PA15) disabled (set to SPI_NSS_SOFT in spi.c).


So, PA15 should be available for TIM2 CH1 PWM output. But no PWM activity can be seen on PA15 (it stays low) until I disable SPI1 peripheral (using HAL_SPI_DeInit() or just __HAL_RCC_SPI1_CLK_DISABLE()).


Did I miss some errata?