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#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
struct RCC {
uint32_t cr;
uint32_t pllcfgr;
uint32_t cfgr;
uint32_t cir;
uint32_t ahb1rstr;
uint32_t ahb2rstr;
uint32_t ahb3rstr;
uint32_t reserved0;
uint32_t apb1rstr;
uint32_t apb2rstr;
uint32_t reserved1;
uint32_t reserved2;
uint32_t ahb1enr;
uint32_t ahb2enr;
uint32_t ahb3enr;
uint32_t reserved3;
uint32_t apb1enr;
uint32_t apb2enr;
uint32_t reserved4;
uint32_t reserved5;
uint32_t ahb1lpenr;
uint32_t ahb2lpenr;
uint32_t ahb3lpenr;
uint32_t reserved6;
uint32_t apb1lpenr;
uint32_t apb2lpenr;
uint32_t reserved7;
uint32_t reserved8;
uint32_t bdcr;
uint32_t csr;
uint32_t reserved9;
uint32_t reserved10;
uint32_t sscgr;
uint32_t plli2scfgr;
};
// static_assert(sizeof(struct RCC) == 0x88, "RCC register size is incorrect.");
volatile struct RCC * const rcc = (struct RCC *) 0x40023800;
#define RCC_AHB1ENR_GPIOAEN 0b0
#define RCC_AHB1ENR_GPIOBEN 0b10
#define RCC_APB1ENR_TIM2EN 0b0
#define RCC_APB1ENR_TIM3EN 0b1
#define RCC_APB1ENR_TIM4EN 0b10
#define RCC_APB1ENR_TIM5EN 0b100
#define RCC_APB1ENR_TIM6EN 0b1000
#define RCC_APB1ENR_TIM7EN 0b10000
#define RCC_APB1ENR_TIM12EN 0b100000
#define RCC_APB1ENR_TIM13EN 0b1000000
#define RCC_APB1ENR_TIM14EN 0b1000000
#define RCC_APB1ENR_UART4EN 0b1000000000000000000
struct GPIO {
uint32_t moder;
uint32_t otyper;
uint32_t ospeedr;
uint32_t pupdr;
uint32_t idr;
uint32_t odr;
uint32_t bsrr;
uint32_t lckr;
uint32_t afrl;
uint32_t afrh;
};
// static_assert(sizeof(struct GPIO) == 0x28, "RCC register size is incorrect.");
volatile struct GPIO * const gpiob = (struct GPIO *) 0x40020400;
volatile struct GPIO * const gpioa = (struct GPIO *) 0x40020000;
#define GPIOB_MODER_0_OUT 0b01
#define GPIOB_MODER_7_OUT 0b0100000000000000
#define GPIOB_MODER_14_OUT 0b010000000000000000000000000000
#define GPIOB_ODR_0 0b1
#define GPIOB_ODR_7 0b10000000
#define GPIOB_ODR_14 0b100000000000000
int main(void) {
rcc->ahb1enr |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN;
rcc->apb1enr |= RCC_APB1ENR_UART4EN;
gpiob->moder |=
GPIOB_MODER_0_OUT |
GPIOB_MODER_7_OUT |
GPIOB_MODER_14_OUT;
gpiob->odr |=
GPIOB_ODR_0 |
GPIOB_ODR_7 |
GPIOB_ODR_14;
}
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