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P1_register_version.c
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P1_register_version.c
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#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "delay.h"
int main(void)
{
RCC->APB2ENR |= (0x1 << 4); // Port C clock enable
RCC->APB2ENR |= (0x1 << 2); // Port A clock enable
GPIOC->CRH &= ~(0xF << 20); // Pin C13 clear
GPIOC->CRH |= (0x2 << 20); // Pin C13 Output config. (Push pull output 2MHz)
// i used Port A3 and A4 for this experiment
GPIOA->CRL &= ~(0xF << 16); // Port A3 clear
GPIOA->CRL &= ~(0xF << 12); // Port A4 clear
GPIOA->CRL |= (0x8 << 16); // Pin A3 input config
GPIOA->CRL |= (0x8 << 12); // Pin A4 input config
delayInit();
int state; //variable for "switch case"
int a; // creating variables for "for loops"
int b;
int c;
int d;
while(1){
switch(state){
case 1: //"we pressed button 1- condition is written inside default case-
//pressing button 1 and blinking for 1000ms period
// i created "for loops" for delays to precisely understand if button 2 pressed or button 1 pressed again.
for(a=0;a<=1000;a+=100){
GPIOC->BRR |= (1 << 13);
delayMs(100);
if(GPIOA->IDR &= (1<<4)){
state=2; } //if button 2 pressed it will switch to case 2
else if(GPIOA->IDR &= (1<<3)){
state=3;
} //if button 1 pressed again , it will switch to case 3
}
for(b=0;b<=1000;b+=100){
GPIOC->BSRR |= (1<<13);
delayMs(100);
if(GPIOA->IDR &= (1<<4)){
state=2; } //if button 2 pressed it will switch to case 2
else if(GPIOA->IDR &= (1<<3)){
state=3;
} //if button 1 pressed again , it will switch to case 3
}
break;
case 2: // Pressing button 2 and blinking for 500ms period
for(c=0;c<=500;c+=50){
GPIOC->BRR |= (1 << 13);
delayMs(50);
if(GPIOA->IDR &= (1<<3)){
state=3; } //if button 1 pressed , it will switch to case 3
else if(GPIOA->IDR &= (1<<4)){
state=1; } //if button 2 pressed again , it will switch to case 1
}
for(d=0;d<=500;d+=50){
GPIOC->BSRR |= (1 << 13);
delayMs(50);
if(GPIOA->IDR &= (1<<3)){
state=3; } //if button 1 pressed , it will switch to case 3
else if(GPIOA->IDR &= (1<<4)){
state=1;} //if button 2 pressed again , it will switch to case 1
}
break;
case 3: // Pressing button 1 after button 2 or 1 pressed, Led will stop blinking
GPIOC->BSRR |= (1<<13);
if(GPIOA->IDR &= (1<<3)){
state=0; } //if button 1 pressed again , it will switch to default case
break;
default:
GPIOC->BSRR |= (1<<13);
delayMs(50);
if(GPIOA->IDR &= (1<<3)) {
state=1; } //if button 1 pressed , it will switch to case 1
break;
}
}
}