From a04cf2a3e236e6a5934ff2588dacad91dc5be65e Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 1 Feb 2022 22:08:53 +0100
Subject: add exam

---
 Year_3/LSM/ex_20150209_A.c | 186 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 Year_3/LSM/ex_20150209_A.c

diff --git a/Year_3/LSM/ex_20150209_A.c b/Year_3/LSM/ex_20150209_A.c
new file mode 100644
index 0000000..69d7e7e
--- /dev/null
+++ b/Year_3/LSM/ex_20150209_A.c
@@ -0,0 +1,186 @@
+#include "stm32_unict_lib.h"
+#include <stdio.h>
+#define SECS_3 3000
+#define X_VAL 11400
+
+/*
+ * RA3    = PB10
+ * RA2    = PB4
+ * RB0    = PB0
+ * RB1    = PC2
+ * RA0    = ADC1_IN11
+ * -      = PB5
+ * +      = PB6
+ */
+
+typedef enum {
+    IDLE,
+    TURN_ON
+} status_t;
+
+status_t status = IDLE;
+
+int X_ms = X_VAL; /* 'r'*100 */
+int Y_ms = 3800; /* X_ms / 3 */
+int Z_ms = 495; /* 'c'*5 */
+int time_turn_on = 0;
+int can_blind = 0;
+
+int y_incr = 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_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);
+
+    TIM_init(TIM2);
+    TIM_set(TIM2, 0);
+    TIM_config_timebase(TIM2, 8400, 10);
+    TIM_enable_irq(TIM2, IRQ_UPDATE);
+    TIM_on(TIM2);
+
+    TIM_init(TIM3);
+    TIM_set(TIM3, 0);
+    TIM_config_timebase(TIM3, 8400, Z_ms * 10);
+    TIM_enable_irq(TIM3, IRQ_UPDATE);
+    TIM_on(TIM3);
+
+    ADC_init(ADC1, ADC_RES_8, ADC_ALIGN_RIGHT);
+    ADC_channel_config(ADC1, GPIOC, 1, 11);
+    ADC_on(ADC1);
+    ADC_sample_channel(ADC1, 11);
+
+    CONSOLE_init();
+}
+
+int
+main()
+{
+    init();
+    char s[5];
+    int min = X_VAL - SECS_3;
+    int max = X_VAL + SECS_3;
+    int value;
+    int adc_read;
+
+    for (;;) {
+        ADC_start(ADC1);
+        while (!ADC_completed(ADC1))
+            ;
+        adc_read = ADC_read(ADC1);
+
+        value = ((ADC_read(ADC1) * (max - min)) / 255.0) + min;
+        X_ms = value;
+        Y_ms = value / 3;
+
+        sprintf(s, "%f", value / 1000.0);
+        DISPLAY_puts(0, s);
+    }
+    return 0;
+}
+
+void
+turn_off(void)
+{
+    status = IDLE;
+    GPIO_write(GPIOB, 0, 0);
+    GPIO_write(GPIOC, 2, 0);
+    time_turn_on = 0;
+    can_blind = 0;
+}
+
+void
+EXTI15_10_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI10)) {
+        if (status == IDLE) {
+            status = TURN_ON;
+            GPIO_write(GPIOB, 0, 1);
+            TIM2->CNT = 0;
+        } else {
+            turn_off();
+        }
+        EXTI_clear(EXTI10);
+    }
+}
+
+void
+EXTI9_5_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI5)) {
+        y_incr -= 100;
+        printf("%d\n", y_incr);
+        EXTI_clear(EXTI5);
+    }
+
+    if (EXTI_isset(EXTI6)) {
+        y_incr += 100;
+        printf("%d\n", y_incr);
+        EXTI_clear(EXTI6);
+    }
+}
+
+void
+EXTI4_IRQHandler(void)
+{
+    if (EXTI_isset(EXTI4)) {
+        if (status == TURN_ON) {
+            time_turn_on = 0;
+        }
+        EXTI_clear(EXTI4);
+    }
+}
+
+void
+TIM2_IRQHandler(void)
+{
+    if (TIM_update_check(TIM2)) {
+        if (status == TURN_ON) {
+            if (time_turn_on >= X_ms) {
+                can_blind = 1;
+            } else {
+                can_blind = 0;
+            }
+
+            if (time_turn_on >= X_ms + Y_ms + y_incr) {
+                turn_off();
+            }
+
+            time_turn_on++;
+        }
+        TIM_update_clear(TIM2);
+    }
+}
+
+void
+TIM3_IRQHandler(void)
+{
+    if (TIM_update_check(TIM3)) {
+        if (can_blind) {
+            GPIO_toggle(GPIOC, 2);
+        } else {
+            GPIO_write(GPIOC, 2, 0);
+        }
+        TIM_update_clear(TIM3);
+    }
+}
-- 
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