// Pure Bare-Metal C in Wokwi (Paste directly into sketch.ino)
#include <stdint.h>

#define RCC_BASE      0x40021000
#define RCC_IOPENR    (*(volatile uint32_t *)(RCC_BASE + 0x34))

#define GPIOA_BASE    0x50000000
#define GPIOA_MODER   (*(volatile uint32_t *)(GPIOA_BASE + 0x00))
#define GPIOA_ODR     (*(volatile uint32_t *)(GPIOA_BASE + 0x14))

void delay(void) {
    for(volatile uint32_t i = 0; i < 200000; i++);
}

int main(void) {
    // 1. Enable clock for GPIOA (Bit 0)
    RCC_IOPENR |= (1 << 0);

    // 2. Configure PA5 as output (Bits 11:10 -> 01)
    GPIOA_MODER &= ~(3 << 10);
    GPIOA_MODER |=  (1 << 10);

    while(1) {
        GPIOA_ODR ^= (1 << 5); // Toggle PA5 (LED pin)
        delay();
    }
}