From bfe6a3992da9b804c4cca8cbe769a55fc1f27745 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Wed, 20 Oct 2021 11:03:18 +0200
Subject: lsm: add file

---
 Year_3/LSM/ex_20181017.c | 204 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 204 insertions(+)
 create mode 100644 Year_3/LSM/ex_20181017.c

diff --git a/Year_3/LSM/ex_20181017.c b/Year_3/LSM/ex_20181017.c
new file mode 100644
index 0000000..147c138
--- /dev/null
+++ b/Year_3/LSM/ex_20181017.c
@@ -0,0 +1,204 @@
+#include "stm32_unict_lib.h"
+#include <stdio.h>
+#include <string.h>
+
+#define OPEN_T 20
+#define CLOSE_T 8
+
+typedef enum {
+    CLOSED,
+    OPENING,
+    OPENED,
+    CLOSING
+} status_t;
+
+status_t status = CLOSED;
+
+/*
+ * X = PB10
+ * Y = PB4
+ * Z = PB5
+ * output:
+ * red = PB0
+ */
+
+char str[5] = "----\0";
+int ms_to_open = OPEN_T; /* 500ms x 10s */
+int ms_to_close = CLOSE_T; /* 500ms x 4s */
+
+int level = 4;
+
+void
+print_dash(int n, int opt)
+{
+    int i;
+
+    if (opt && level < n)
+        return;
+    else if (!opt && level > n)
+        return;
+
+    memset(str, ' ', 5);
+    for (i = 0; i < n; ++i)
+        *(str + i) = '-';
+
+    for (; i < 5; ++i)
+        *(str + i) = ' ';
+
+    level = n;
+}
+
+int
+main()
+{
+    GPIO_init(GPIOB);
+    GPIO_init(GPIOC);
+
+    GPIO_config_input(GPIOB, 10); /* X, change status to OPENING */
+    GPIO_config_input(GPIOB, 4); /* Y */
+    GPIO_config_input(GPIOB, 5); /* Z */
+
+    GPIO_config_output(GPIOB, 0); /* led */
+
+    DISPLAY_init();
+
+    GPIO_config_EXTI(GPIOB, EXTI10);
+    EXTI_enable(EXTI10, FALLING_EDGE);
+    GPIO_config_EXTI(GPIOB, EXTI4);
+    EXTI_enable(EXTI4, FALLING_EDGE);
+    GPIO_config_EXTI(GPIOB, EXTI5);
+    EXTI_enable(EXTI5, FALLING_EDGE);
+
+    /* Timer for red LED */
+    TIM_init(TIM2);
+    TIM_set(TIM2, 0);
+    TIM_on(TIM2);
+    TIM_enable_irq(TIM2, IRQ_UPDATE);
+    TIM_config_timebase(TIM2, 8400, 5000);
+
+    for (;;) {
+        DISPLAY_puts(0, str);
+    }
+
+    return 0;
+}
+
+void
+EXTI9_5_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI5)) {
+        int mul;
+        if (status == OPENED) {
+            switch (level) {
+            case 1:
+                mul = 25;
+                break;
+            case 2:
+                mul = 50;
+                break;
+            default:
+                mul = 70;
+            }
+            ms_to_close = CLOSE_T - (CLOSE_T * mul / 100);
+        } else if (status == CLOSING) {
+            switch (level) {
+            case 1:
+                mul = 25;
+                break;
+            case 2:
+                mul = 50;
+                break;
+            default:
+                mul = 70;
+            }
+            ms_to_open = OPEN_T - (OPEN_T * mul / 100);
+            status = OPENING;
+        }
+        EXTI_clear(EXTI5);
+    }
+}
+
+void
+EXTI15_10_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI10)) {
+        status = OPENING;
+        int mul;
+        switch (level) {
+        case 1:
+            mul = 70;
+            break;
+        case 2:
+            mul = 50;
+            break;
+        default:
+            mul = 25;
+        }
+        ms_to_open = OPEN_T - (OPEN_T * mul / 100);
+        EXTI_clear(EXTI10);
+    }
+}
+
+void
+EXTI4_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI4)) {
+        if (status == OPENED) {
+            status = CLOSING;
+            ms_to_close = OPEN_T;
+        } else if (status == OPENING) {
+            status = CLOSING;
+            ms_to_close = OPEN_T - ms_to_close;
+        }
+        EXTI_clear(EXTI4);
+    }
+}
+
+void
+TIM2_IRQHandler(void)
+{
+    if (status == OPENING) {
+        GPIO_toggle(GPIOB, 0);
+        ms_to_open--;
+
+        if (ms_to_open <= OPEN_T - (OPEN_T * 70 / 100)) {
+            print_dash(1, 1);
+        } else if (ms_to_open <= OPEN_T - (OPEN_T * 50 / 100)) {
+            print_dash(2, 1);
+        } else if (ms_to_open <= OPEN_T - (OPEN_T * 25 / 100)) {
+            print_dash(3, 1);
+        }
+
+        if (ms_to_open == 0) {
+            status = OPENED;
+            print_dash(0, 1);
+            GPIO_write(GPIOB, 0, 0);
+            ms_to_open = OPEN_T; /* Reset timer of 10s */
+        }
+    } else if (status == OPENED) {
+        ms_to_close--;
+        if (ms_to_close == 0) {
+            status = CLOSING;
+            ms_to_close = OPEN_T; /* During the closing, ms_to_close has the same value of OPENING time */
+        }
+    } else if (status == CLOSING) {
+        GPIO_toggle(GPIOB, 0);
+        ms_to_close--;
+        if (ms_to_close <= OPEN_T - (OPEN_T * 70 / 100)) {
+            print_dash(3, 0);
+        } else if (ms_to_close <= OPEN_T - (OPEN_T * 50 / 100)) {
+            print_dash(2, 0);
+        } else if (ms_to_close <= OPEN_T - (OPEN_T * 25 / 100)) {
+            print_dash(1, 0);
+        }
+
+        if (ms_to_close == 0) {
+            status = CLOSED;
+            print_dash(4, 0);
+            GPIO_write(GPIOB, 0, 0);
+            ms_to_close = CLOSE_T;
+        }
+    }
+
+    TIM_update_clear(TIM2);
+}
-- 
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