#include "stm32f4xx.h"

  /*
  GPIOx->MODER   = 0x00000000;   // MODE Register: 00-in, 01-out, 10-AF, 11-analog
  GPIOx->OTYPER  =     0x0000;   // Output TYPE Register: 0-PushPull, 1-OpenDrain
  GPIOx->OSPEEDR = 0x00000000;   // Output SPEED Register: 00-2, 01-25, 10-50, 11-100 [MHz]
  GPIOx->PUPDR   = 0x00000000;   // PullUp PullDown Register: 00-none, 01-Pup, 10-Pdn, 11-reserved
  GPIOx->IDR     =     0x0000;   // Input Data Register
  GPIOx->ODR     =     0x0000;   // Output Data Register
  GPIOx->BSRRL   =     0x0000;   // Bit Set Reset Register Hi: bit  sets  PortPin
  GPIOx->BSRRH   =     0x0000;   // Bit Set Reset Register Lo: bit resets PortPin
  GPIOx->LCKR    = 0x00000000;   // LoCK Register 
  GPIOx->AFR[0]  = 0x00000000;   // Alternative Function Register Lo - select 1of16
  GPIOx->AFR[1]  = 0x00000000;   // Alternative Function Register Hi - select 1of16
  */


void main (void)  {              // This set for LED only
char in;
  RCC->AHB1ENR |= 16 + 8 + 4 + 1;     // Enable clock for GPIOA, C, D, E   

  GPIOA->MODER   |= 0x00005000;  // MODE Register - LED PA06, PA07
  GPIOC->MODER   |= 0x04000000;  // MODE Register - LED PC13
  GPIOD->MODER   |= 0x00100000;  // MODE Register - LED PD10

  while (1) {
    in = GPIOE->IDR & 0x3f;      // use lower six bits from port E
    if (in & 0x01) GPIOA->ODR |= 0x0040; else GPIOA->ODR &= ~0x0040;
    if (in & 0x02) GPIOA->ODR |= 0x0080; else GPIOA->ODR &= ~0x0080;
    if (in & 0x04) GPIOC->ODR |= 0x2000; else GPIOC->ODR &= ~0x2000;
    if (in & 0x08) GPIOD->ODR |= 0x0400; else GPIOD->ODR &= ~0x0400;
    //if (in & 0x10) GPIOA->ODR |= 0x00c0; else GPIOA->ODR &= ~0x00c0;
    //if (in & 0x20) GPIOD->ODR |= 0x0400; else GPIOD->ODR &= ~0x0400;
  };

}