From c180f3456c7aa8bb326760be5b66df709aed6014 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Sun, 6 Feb 2022 15:32:20 +0100
Subject: lsm: add e xam
---
Year_3/LSM/ex_20190409.c | 274 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 274 insertions(+)
create mode 100644 Year_3/LSM/ex_20190409.c
(limited to 'Year_3')
diff --git a/Year_3/LSM/ex_20190409.c b/Year_3/LSM/ex_20190409.c
new file mode 100644
index 0000000..4a960c4
--- /dev/null
+++ b/Year_3/LSM/ex_20190409.c
@@ -0,0 +1,274 @@
+#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);
+ }
+}
--
cgit v1.2.3-18-g5258