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P1_peripheral_function_version.c
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P1_peripheral_function_version.c
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#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "delay.h"
GPIO_InitTypeDef GPIO_InitStructure;
int main(void)
{
// Enabling clock for PortC
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
// Configuring PC13 as desired LED
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// Enabling clock for PortA
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
// i used PA3 and PA4 for this experiment
// Configuring PA3 as input -- it will be Button 1
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
// Configuring PA4 as input -- it will be Button 2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
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){
GPIO_ResetBits(GPIOC, GPIO_Pin_13);
delayMs(100);
if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_4)){
state=2; } //if button 2 pressed it will switch to case 2
else if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)){
state=3;
} //if button 1 pressed again , it will switch to case 3
}
for(b=0;b<=1000;b+=100){
GPIO_SetBits(GPIOC, GPIO_Pin_13);
delayMs(100);
if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_4)){
state=2; } //if button 2 pressed it will switch to case 2
else if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_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){
GPIO_ResetBits(GPIOC, GPIO_Pin_13);
delayMs(50);
if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)){
state=3; } //if button 1 pressed , it will switch to case 3
else if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_4)){
state=1;} //if button 2 pressed again , it will switch to case 1
}
for(d=0;d<=500;d+=50){
GPIO_SetBits(GPIOC, GPIO_Pin_13);
delayMs(50);
if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)){
state=3; } //if button 1 pressed , it will switch to case 3
else if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)){
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
GPIO_SetBits(GPIOC, GPIO_Pin_13);
if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)){
state=0; } //if button 1 pressed again , it will switch to default case
break;
default:
GPIO_SetBits(GPIOC, GPIO_Pin_13);
delayMs(50);
if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)) {
state=1; } //if button 1 pressed , it will switch to case 1
break;
}
}
}