How to setup Interface Encoder mode for the STM32F0

Question

Alright, so my goal is to setup Interface Encoder mode on pins a1 and a5. To read the TIM2->CNT. Ive got a rotary Encoder hooked up to both pins and ground/5v. I've looked at the datasheet and I think I've configured the setup properly but I cant get it to work.

This is my setup

void init_hardware_timer_version(void)
{
    RCC->AHBENR |= RCC_AHBENR_GPIOAEN; // Enable GPIOA clock
    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN; // Enable TIM2 clock

    TIM2->ARR = 12; // Set auto-reload register to maximum value

    // Configure capture/compare mode
    TIM2->CCMR1 |= (TIM_CCMR1_CC1S_0 | TIM_CCMR1_CC2S_0);

    // Configure capture/compare polarity
    TIM2->CCER &= ~(TIM_CCER_CC1P | TIM_CCER_CC2P);

    // Configure the slave mode controller
    TIM2->SMCR |= TIM_SMCR_SMS_0 | TIM_SMCR_SMS_1;

    // Enable the timer
    TIM2->CR1 |= TIM_CR1_CEN;
}

Now my expectation is that after calling up on theTIM2->CNT in the main that the value changes based on the rotation of the Encoder. However the CNT seems to remain 0. I'm not sure why its not working.

Edit: This is how I setup the pins

GPIOA->MODER |= GPIO_MODER_MODER1_1 | GPIO_MODER_MODER5_1; // Set PA1 and PA5 to alternate function mode
GPIOA->AFR[0] |= (1 << (1 * 4)) | (1 << (5 * 4)); // Set alternate function AF1 for PA1 and PA5 (TIM2_CH2 and TIM2_CH1)

Answer 1

You haven't told us which STM32F0xx are you using; but in all 'F0xx datasheet I've checked ('F031/'F042/'F051/'F072/'F091), TIM2_CHx on PA1 and PA5 is AF2, not AF1.