/*
 * Read switches and use the data to set LEDs of the EduBase board.
 *
 * The four LEDs are:
 * LED3 - PB7
 * LED2 - PB6
 * LED1 - PB5
 * LED0 - PB4
 *
 * The four switches are:
 * SW2  - PC11
 * SW3  - PC10
 * SW4  - PC9
 * SW5  - PC8
 */

#include "stm32f4xx.h"

void delayMs(int n);

int main(void) {
    RCC->AHB1ENR |=  2;             /* enable GPIOB clock */
    RCC->AHB1ENR |=  4;             /* enable GPIOC clock */

    GPIOB->MODER &= ~0x0000ff00;    /* clear pin mode */
    GPIOB->MODER |=  0x00005500;    /* set pins to output mode */
    GPIOC->MODER &= ~0x00FF0000;    /* clear pin mode */

    while (1) {
        /* Read port C bits 11-8, shift them 4 bit right,
         * write them to port B bits 7-4.
         */
        GPIOB->ODR = GPIOC->IDR >> 4;
    }
}