[LV3] Mikroračunalni sustavi

#include <stddef.h>
#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_usart.h"

int getchar(void);
int putchar(int c);
void putString(char *string);

int znak;

int main(void)
{
         GPIO_InitTypeDef GPIO_InitStruct;
         USART_InitTypeDef USART_InitStruct;
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB
| RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);

   //1-inicijalizacija PBO za LED
   GPIO_StructInit(&GPIO_InitStruct);
   GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
   GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
   GPIO_Write(GPIOB, 0xFFFF);
   GPIO_Init(GPIOB, &GPIO_InitStruct);

   //2-Inicijalizacija USART1
   //2a - Inicijalizacija Tx pina (GPIOA, GPIO_Pin_9)
   GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    //2b - Inicijalizacija Tx pina (GPIOA, GPIO_Pin_10)
     GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
     GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOA, &GPIO_InitStruct);

     //2c - komunikacijski parametri USART1
     USART_StructInit(&USART_InitStruct);
     USART_InitStruct.USART_BaudRate = 115200;
     USART_InitStruct.USART_WordLength = USART_WordLength_8b;
     USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
     USART_InitStruct.USART_Parity = USART_Parity_No;
     USART_InitStruct.USART_StopBits = USART_StopBits_1;
     USART_InitStruct.USART_HardwareFlowControl =
USART_HardwareFlowControl_None;
     USART_Init(USART1, &USART_InitStruct);
     USART_Cmd(USART1, ENABLE);

   while(1){

           znak = getchar();
           if(znak==-1)continue;
           putchar(znak);

           switch(znak){
           case 'p' :
           case 'P' : GPIO_WriteBit(GPIOB, GPIO_Pin_0, RESET);
                      break;
           case 'g' :
           case 'G' : GPIO_WriteBit(GPIOB, GPIO_Pin_0, SET);
                            break;
           default : break;
           }

   }
}

int getchar(void){
         if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET){
                 return USART1->DR & 0xff;
         }else{
                 return -1;
         }
}

int putchar(int c){
         while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
         USART1->DR = c & 0xff;

         return 0;
}

void putString(char *string){

}