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#include "stm32_unict_lib.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
typedef struct {
char name[10];
float price;
char display[2];
short s_range;
short e_range;
} drinks_t;
typedef enum {
SELECTING,
EROGATING,
RESTING,
} status_t;
typedef struct {
int five_c;
int ten_c;
int twenty_c;
} rest_t;
drinks_t drinks[3];
float total = 0.0;
int flag_add = 0;
status_t status = SELECTING;
int inc_erogating = 0;
int value;
rest_t rest;
int q_rest[30] = { 0 };
int q_index = 0;
int q_jndex = 0;
int total_to_return;
void
init()
{
DISPLAY_init();
GPIO_init(GPIOB);
GPIO_init(GPIOC);
GPIO_config_input(GPIOB, 10);
GPIO_config_EXTI(GPIOB, EXTI10);
EXTI_enable(EXTI10, FALLING_EDGE);
GPIO_config_input(GPIOB, 4);
GPIO_config_EXTI(GPIOB, EXTI4);
EXTI_enable(EXTI4, FALLING_EDGE);
GPIO_config_input(GPIOB, 5);
GPIO_config_EXTI(GPIOB, EXTI5);
EXTI_enable(EXTI5, FALLING_EDGE);
GPIO_config_input(GPIOB, 6);
GPIO_config_EXTI(GPIOB, EXTI6);
EXTI_enable(EXTI6, FALLING_EDGE);
GPIO_config_output(GPIOB, 0);
GPIO_config_output(GPIOC, 2);
GPIO_config_output(GPIOC, 3);
TIM_init(TIM2);
TIM_set(TIM2, 0);
TIM_config_timebase(TIM2, 8400, 5000);
TIM_enable_irq(TIM2, IRQ_UPDATE);
TIM_on(TIM2);
ADC_init(ADC1, ADC_RES_6, ADC_ALIGN_RIGHT);
ADC_channel_config(ADC1, GPIOC, 1, 11);
ADC_on(ADC1);
ADC_sample_channel(ADC1, 11);
CONSOLE_init();
}
int
search_index_range(int value)
{
int i;
for (i = 0; i < 3; ++i) {
if (drinks[i].s_range <= value && drinks[i].e_range >= value)
break;
}
return i;
}
void
get_rest(int drink_index)
{
total_to_return = floor((total - drinks[drink_index].price) * 100);
while (rest.twenty_c > 0) {
if ((total_to_return - 20) >= 0) {
total_to_return -= 20;
rest.twenty_c--;
q_rest[q_index++] = 20;
} else {
break;
}
}
while (rest.ten_c > 0) {
if ((total_to_return - 10) >= 0) {
total_to_return -= 10;
rest.ten_c--;
q_rest[q_index++] = 10;
} else {
break;
}
}
while (rest.five_c > 0) {
if ((total_to_return - 5) >= 0) {
total_to_return -= 5;
rest.five_c--;
q_rest[q_index++] = 5;
} else {
break;
}
}
}
int
main()
{
init();
strcpy(drinks[0].name, "Coffee");
strcpy(drinks[0].display, "Ca");
drinks[0].price = 0.35;
drinks[0].s_range = 0;
drinks[0].e_range = 28;
strcpy(drinks[1].name, "The");
strcpy(drinks[1].display, "te");
drinks[1].price = 0.40;
drinks[1].s_range = 29;
drinks[1].e_range = 38;
strcpy(drinks[2].name, "Choco");
strcpy(drinks[2].display, "Ci");
drinks[2].price = 0.45;
drinks[2].s_range = 39;
drinks[2].e_range = 64;
rest.five_c = 10;
rest.ten_c = 10;
rest.twenty_c = 10;
char s[5];
char s2[2];
for (;;) {
ADC_start(ADC1);
while (!ADC_completed(ADC1))
;
value = ADC_read(ADC1);
int index = search_index_range(value);
sprintf(s, "%s", drinks[index].display);
DISPLAY_puts(0, s);
if (status == RESTING) {
if (inc_erogating) {
printf("%d %d %d\n", inc_erogating, q_rest[q_jndex], q_jndex);
sprintf(s2, "%02d", q_rest[q_jndex++]);
} else {
sprintf(s2, " ");
}
DISPLAY_puts(2, s2);
delay_ms(500);
} else {
sprintf(s, "%.1f", total);
DISPLAY_puts(2, s);
sprintf(s, "%.1f", total - floor(total));
memcpy(s, &s[2], 1);
s[1] = '\0';
DISPLAY_puts(3, s);
}
}
return 0;
}
void
EXTI15_10_IRQHandler(void)
{
if (EXTI_isset(EXTI10)) {
if (status == SELECTING) {
total += 0.5;
flag_add = 1;
}
EXTI_clear(EXTI10);
}
}
void
EXTI9_5_IRQHandler(void)
{
if (EXTI_isset(EXTI5)) {
if (status == SELECTING) {
total += 0.1;
flag_add = 1;
}
EXTI_clear(EXTI5);
}
if (EXTI_isset(EXTI6)) {
if (status == SELECTING) {
status = EROGATING;
GPIO_write(GPIOC, 3, 1);
}
EXTI_clear(EXTI6);
}
}
void
EXTI4_IRQHandler(void)
{
if (EXTI_isset(EXTI4)) {
if (status == SELECTING) {
total += 0.2;
flag_add = 1;
}
EXTI_clear(EXTI4);
}
}
void
TIM2_IRQHandler(void)
{
if (TIM_update_check(TIM2)) {
if (status == SELECTING) {
if (flag_add == 1) {
GPIO_write(GPIOB, 0, 1);
flag_add = 0;
} else {
GPIO_write(GPIOB, 0, 0);
}
} else if (status == EROGATING) {
if (inc_erogating == 1) {
GPIO_write(GPIOC, 3, 0);
status = RESTING;
inc_erogating = 0;
get_rest(search_index_range(value));
total = 0.0;
GPIO_write(GPIOA, 7, 0);
}
inc_erogating ^= 1;
} else {
GPIO_write(GPIOC, 2, 1);
inc_erogating ^= 1;
if (q_index == q_jndex) {
GPIO_write(GPIOC, 2, 0);
q_index = q_jndex = 0;
status = SELECTING;
}
}
TIM_update_clear(TIM2);
}
}
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