From 04c61dba3db9a885a6955ec5433d9ac77f2345b6 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Sun, 6 Feb 2022 18:15:41 +0100
Subject: lsm: add e xam

---
 Year_3/LSM/ex_shopqueue.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Year_3/LSM/ex_shopqueue.c

(limited to 'Year_3')

diff --git a/Year_3/LSM/ex_shopqueue.c b/Year_3/LSM/ex_shopqueue.c
new file mode 100644
index 0000000..b6b5130
--- /dev/null
+++ b/Year_3/LSM/ex_shopqueue.c
@@ -0,0 +1,114 @@
+#include "stm32_unict_lib.h"
+#include <stdio.h>
+#include <string.h>
+
+int queue = 0;
+int current_ticket = 0;
+int average_s = 0;
+
+int incr_s = -1;
+
+int ms500 = 0;
+int sum = 0;
+int n = 0;
+
+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_output(GPIOB, 0);
+
+    TIM_init(TIM3);
+    TIM_set(TIM3, 0);
+    TIM_config_timebase(TIM3, 8400, 5000);
+    TIM_config_IC(TIM3, 1, IC_FALLING_EDGE);
+    TIM_enable_irq(TIM3, IRQ_UPDATE | IRQ_CC_1);
+    TIM_on(TIM3);
+
+    CONSOLE_init();
+}
+
+int
+main()
+{
+    init();
+
+    char s[2];
+
+    for (;;) {
+        if (incr_s >= 0) {
+            if ((incr_s % 2) == 1) {
+                sprintf(s, "%02d", queue);
+            } else {
+                sprintf(s, "  ");
+            }
+        } else {
+            sprintf(s, "%02d", current_ticket);
+        }
+
+        DISPLAY_puts(0, s);
+
+        sprintf(s, "%02d", average_s);
+        DISPLAY_puts(2, s);
+    }
+    return 0;
+}
+
+void
+EXTI15_10_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI10)) {
+        queue++;
+        incr_s = 0;
+        GPIO_write(GPIOB, 0, 1);
+        TIM3->CNT = 0;
+
+        EXTI_clear(EXTI10);
+    }
+}
+
+void
+EXTI4_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI4)) {
+        int seconds = ms500 / 2;
+        sum += seconds;
+        n++;
+
+        average_s = sum / n;
+        current_ticket++;
+        ms500 = 0;
+
+        EXTI_clear(EXTI4);
+    }
+}
+
+void
+TIM3_IRQHandler(void)
+{
+    char s[2];
+    if (TIM_update_check(TIM3)) {
+        ms500++;
+
+        if (incr_s >= 0) {
+            incr_s++;
+
+            if (incr_s == 4) {
+                incr_s = -1;
+                GPIO_write(GPIOB, 0, 0);
+            }
+        }
+
+        TIM_update_clear(TIM3);
+    }
+}
-- 
cgit v1.2.3-18-g5258