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STM32F103R8T TIM1 CHxN outputs disabled after UART1 remap

Question asked by lopez.antonio.003 on Jul 6, 2017



The STM32 device I'm using has a 64 pin package.


TIM1 is used for PWM control of a PMSM motor in FOC mode., connecting its 6 channels to a three phase IGBT bridge.


I don't remap TIM1, so PA8, PA9, PA10, PB13, PB14 and PB15 are configured as alternate function push pull outputs, and PB12 is configured as floating input for the BKIN function of TIM1.


In the same application, USART 1 is used for communicating with a host processor. USART1 is remapped to PB6/PB7 because default assignment is to pins PA9/PA10, which are needed for TIM1.


The problem is that after enabling and remapping USART1, the 3 low side channels from TIM1 stop working. If I comment out USART1 initialization code then all 6 channels from TIM1 work as intended, so I'm pretty sure the problem is related to USART1 configuration and/or remapping.


I've been looking at the errata sheet and found many remapping relating problems, but this specific one is not listed.


Did anybody else experience the same problem?


Thank you in advance.