C version of led blink

led.cpp

// Step 1: Enable the clock to PORT B
RCC->APB2ENR |= RCC_APB2ENR_IOPCEN;

// Step 2: Change PB0's mode to 0x3 (output) and cfg to 0x0 (push-pull)
GPIOC->CRH = GPIO_CRH_MODE13_0 | GPIO_CRH_MODE13_1;

// Step 3: Set PB0 high
GPIOC->BSRR = GPIO_BSRR_BS13;

// Step 4: Reset PB0 low
GPIOC->BSRR = GPIO_BSRR_BR13;