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authorSanto Cariotti <santo@dcariotti.me>2023-01-07 18:51:31 +0100
committerSanto Cariotti <santo@dcariotti.me>2023-01-07 18:51:31 +0100
commitaa0ee3d92b13c70eb749188eb549f9025250defa (patch)
treee869f1a496d41dc2aabcd5d91143dabfbf36be8e /Year_3
parent9240342b366db9999f11659a1f1c396ba418ad78 (diff)
Add exam for lsm
Diffstat (limited to 'Year_3')
-rw-r--r--Year_3/LSM/exam.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/Year_3/LSM/exam.c b/Year_3/LSM/exam.c
new file mode 100644
index 0000000..fca2061
--- /dev/null
+++ b/Year_3/LSM/exam.c
@@ -0,0 +1,272 @@
+#include "stm32_unict_lib.h"
+#include <ctype.h> /* For isdigit() */
+#include <stdio.h>
+#include <stdlib.h> /* For atoi() */
+#include <string.h>
+
+typedef int electr_users_t;
+
+typedef enum {
+ IDLE, /* Init state */
+ CONSUME_ALL, /* Press X */
+ CONSUME_PER_SECOND, /* Press Y */
+ CONFIG, /* Press T */
+} status_t;
+
+electr_users_t electr_user[2];
+status_t status = IDLE;
+short switch_on = 0; /* Press Z */
+int consumption = 0;
+float consumption_per_second = 0.0;
+int threshold = 3000; /* Start value */
+short counter_over_threshold = 0;
+short alarm_on = 0;
+
+float
+calculate_consume_per_second()
+{
+ /* E = P * t
+ * where E is kW/h, P is kW and t is hours
+ * `energy_hours` is kWh
+ */
+ float energy_hours = ((electr_user[0] + electr_user[1]) / 1000.0) * ((1 / 60.0) / 60.0);
+
+ return energy_hours * 3600;
+}
+
+int
+get_new_threshold()
+{
+ char string[4];
+ char ch;
+ int i;
+ int error;
+ int num;
+
+ memset(string, 0, 4);
+
+ do {
+ printf("\nAdd a threshold in [0, 3000]: ");
+ fflush(stdout);
+
+ error = 0;
+ for (i = 0; i < 4; ++i) {
+ ch = readchar();
+
+ if (ch == 13) {
+ if (i == 0) {
+ error = 1;
+ } else {
+ string[i] = '\0';
+ }
+
+ break;
+ } else if (!isdigit(ch)) {
+ error = 1;
+ break;
+ }
+
+ __io_putchar(ch);
+ string[i] = ch;
+ }
+
+ if (error) {
+ printf("\nEnter a number.");
+ num = 3001;
+ } else {
+ /* `num` can't be < 0 because '-' is not a valid character */
+ num = atoi(string);
+ }
+ } while (num > 3000);
+
+ return num;
+}
+
+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, 3);
+
+ TIM_init(TIM2);
+ TIM_set(TIM2, 0);
+ /* TIM2 is 32-bits */
+ /* (42000/84e3) * 2000 = 1000 ms */
+ TIM_config_timebase(TIM2, 42000, 2000);
+ TIM_enable_irq(TIM2, IRQ_UPDATE);
+ TIM_on(TIM2);
+
+ ADC_init(ADC1, ADC_RES_8, ADC_ALIGN_RIGHT);
+ ADC_channel_config(ADC1, GPIOC, 0, 10);
+ ADC_channel_config(ADC1, GPIOC, 1, 11);
+ ADC_on(ADC1);
+
+ CONSOLE_init();
+}
+
+int
+main()
+{
+ int adc_read;
+ char s[5];
+
+ init();
+
+ for (;;) {
+ ADC_sample_channel(ADC1, 11);
+ ADC_start(ADC1);
+ while (!ADC_completed(ADC1))
+ ;
+ adc_read = ADC_read(ADC1);
+ electr_user[0] = (adc_read * 500 / 255);
+
+ ADC_sample_channel(ADC1, 10);
+ ADC_start(ADC1);
+ while (!ADC_completed(ADC1))
+ ;
+ adc_read = ADC_read(ADC1);
+ electr_user[1] = (adc_read * 1000 / 255);
+
+ switch (status) {
+ case CONSUME_ALL:
+ /* Handle the case if the integer value is greater
+ * than the maximum length of the screen.
+ * In that case use KWatt
+ */
+
+ if (consumption <= 9999) {
+ sprintf(s, "%4d", consumption);
+ } else {
+ sprintf(s, "%4f", consumption / 1000.0);
+ }
+ break;
+ case CONSUME_PER_SECOND:
+ sprintf(s, "%4f", consumption_per_second);
+ break;
+ case CONFIG:
+ threshold = get_new_threshold();
+ status = IDLE;
+ counter_over_threshold = 0;
+ break;
+ default:
+ memset(s, ' ', 4);
+ }
+
+ DISPLAY_puts(0, s);
+ }
+
+ return 0;
+}
+
+void
+EXTI15_10_IRQHandler(void)
+{
+ if (EXTI_isset(EXTI10)) {
+ /* X */
+
+ if (status != CONFIG) {
+ status = CONSUME_ALL;
+ }
+
+ EXTI_clear(EXTI10);
+ }
+}
+
+void
+EXTI9_5_IRQHandler(void)
+{
+ if (EXTI_isset(EXTI6)) {
+ /* T */
+
+ status = CONFIG;
+
+ EXTI_clear(EXTI6);
+ }
+
+ if (EXTI_isset(EXTI5)) {
+ /* Z */
+
+ if (status != CONFIG) {
+ switch_on = !switch_on;
+
+ /* GPIO_toggle() does not assure 1 for ON and 0 for OFF */
+ if (switch_on) {
+ alarm_on = 0;
+ counter_over_threshold = 0;
+ GPIO_write(GPIOB, 0, 0); /* Turn off red led */
+ GPIO_write(GPIOC, 3, 1);
+ } else {
+ status = IDLE;
+ GPIO_write(GPIOC, 3, 0);
+ }
+
+ consumption = 0;
+ consumption_per_second = 0;
+ }
+
+ EXTI_clear(EXTI5);
+ }
+}
+
+void
+EXTI4_IRQHandler(void)
+{
+ if (EXTI_isset(EXTI4)) {
+ /* Y */
+
+ if (status != CONFIG) {
+ status = CONSUME_PER_SECOND;
+ }
+
+ EXTI_clear(EXTI4);
+ }
+}
+
+void
+TIM2_IRQHandler(void)
+{
+ if (TIM_update_check(TIM2)) {
+ if (!alarm_on && status != CONFIG) {
+ if (switch_on) {
+ int current_watts = (electr_user[0] + electr_user[1]);
+ consumption += current_watts;
+
+ if (current_watts > threshold) {
+ counter_over_threshold++;
+
+ if (counter_over_threshold > 10) {
+ alarm_on = 1;
+ GPIO_write(GPIOB, 0, 1); /* Turn on red led */
+ GPIO_write(GPIOC, 3, 0); /* Turn off green led */
+ switch_on = 0;
+ }
+ }
+
+ consumption_per_second = calculate_consume_per_second();
+ }
+ }
+
+ TIM_update_clear(TIM2);
+ }
+}