PA1-6 do not HIGH/LOW

[berendi]

1. Enable the peripheral (GPIOA in this case) clock in RCC->AHB1ENR.
2. Set the pins to output mode in GPIOA->MODER.

You can find the description of these registers in the reference manual.

[Ala]

Dear berendi

[berendi]

STM32 controllers can't be powered with 5V, they can take at most 3.6V, and usually powered with 3.3V.

You can connect pull-up resistors to the pins and set them to open-drain mode (set corresponding bits in GPIOA->OTYPER), as long as they are 5V tolerant - check the pin definitions table in the datasheet for that, PA4 and PA5 are NOT 5V tolerant, pick another pins instead.