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#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);
}
}
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