205 lines
4.9 KiB
C
205 lines
4.9 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "utils.h"
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#include "main.h"
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#include "adc.h"
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#include "uart.h"
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volatile uint16_t syscounter = 0;
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uint16_t voltage_bat = 0;
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uint16_t voltage_gen = 0;
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uint16_t current_in = 0;
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uint8_t overvoltage_counter = 0;
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uint8_t overvoltage_off_counter = 0;
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uint8_t undervoltage_counter = 0;
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uint8_t undervoltage_off_counter = 0;
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uint8_t generator_counter = 0;
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uint8_t generator_off_counter = 0;
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static void timer_init(void) {
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// clock is 8MHz
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TCCR1B |= _BV(WGM12) | _BV(CS11) | _BV(CS10) ; // CTC Mode for Timer 1 (16Bit) with prescale of 64
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OCR1A = 1250; // 100Hz
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TIMSK = _BV(OCIE1A);
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sei(); // enable interrupts
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}
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static void ports_init(void) {
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DDR_SW |= _BV(LOADSW) | _BV(GENSW);
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PORT_SW &= ~(_BV(LOADSW) | _BV(GENSW));
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}
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void measure(void) {
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static int16_t temp;
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voltage_bat = adc_read_avg(AD_V_BAT, 4);
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voltage_bat *= VOLTAGE_PER_TICK;
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voltage_bat += 790;
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voltage_gen = adc_read_avg(AD_V_GEN, 4);
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voltage_gen *= VOLTAGE_PER_TICK;
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temp = adc_read_avg(AD_I_GEN, 4);
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temp -= CURRENT_OFFSET;
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if(temp < 0) temp = 0;
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current_in = temp * CURRENT_PER_TICK;
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}
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uint16_t get_power(uint16_t voltage, int16_t currents) {
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return (voltage/100 * (currents/100)) / 100 ;
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}
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void pretty_print_all_values(void) {
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uart_puts_P("Battery Voltage: ");
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uart_print_uint16(voltage_bat);
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uart_puts_P("mV\r\n");
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uart_puts_P("Generator Voltage: ");
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uart_print_uint16(voltage_gen);
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uart_puts_P("mV\r\n");
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uart_puts_P("Generator: ");
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uart_print_uint16(current_in);
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uart_puts_P("mA ");
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uart_print_uint16(get_power(voltage_bat, current_in));
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uart_puts_P("W\r\n");
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uart_puts_P("switches (load, gen): ");
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uart_putc(48 + (IS_LOAD_ON >> LOADSW));
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uart_putc(',');
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uart_putc(48 + (IS_GEN_ON >> GENSW));
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uart_puts_P("\r\n");
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}
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void handle_over_and_undervoltage(void) {
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if(voltage_bat < UNDERVOLTAGE) {
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undervoltage_off_counter = 0;
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if(undervoltage_counter<UNDERVOLTAGE_TIMEOUT) undervoltage_counter++;
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} else {
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undervoltage_counter = 0;
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if(undervoltage_off_counter<UNDERVOLTAGEOFF_TIMEOUT) undervoltage_off_counter++;
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}
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if(voltage_gen > GENERATOR) {
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generator_off_counter = 0;
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if(generator_counter<GENERATOR_TIMEOUT) generator_counter++;
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} else {
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generator_counter = 0;
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if(generator_off_counter<GENERATOR_OFF_TIMEOUT) generator_off_counter++;
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}
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if(undervoltage_counter >= UNDERVOLTAGE_TIMEOUT) {
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// spannung zu niedrig => abschalten
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undervoltage_off_counter = 0;
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LOAD_OFF;
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} else {
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// spannung ist okay
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// ist die spannung schon lange genug okay?
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if(undervoltage_off_counter >= UNDERVOLTAGEOFF_TIMEOUT) {
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undervoltage_counter = 0;
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// ja, also schauen ob der generator schon lange genug läuft
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if(generator_counter >= GENERATOR_TIMEOUT) {
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// ja, also einschalten
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LOAD_ON;
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} else {
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// nein, generator nicht lange genug an
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// ist er vielleicht schon lange aus?
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if(generator_off_counter >= GENERATOR_OFF_TIMEOUT) {
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// ja, also abschalten, egal ob akku okay
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LOAD_OFF;
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}
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}
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}
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}
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#ifdef DEBUG
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uart_puts_P("ov1=");
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uart_print_uint8(overvoltage_counter1);
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uart_puts_P(" ovo1=");
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uart_print_uint8 (overvoltage_off_counter1);
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uart_puts_P("\r\n");
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uart_puts_P("uv =");
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uart_print_uint8(undervoltage_counter);
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uart_puts_P(" uvo =");
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uart_print_uint8(undervoltage_off_counter);
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uart_puts_P("\r\n");
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#endif
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}
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static void work_uart(void) {
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uint16_t uart_char = uart_getc();
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if(uart_char != UART_NO_DATA) {
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switch(uart_char & 0xff) {
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case 'p':
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pretty_print_all_values();
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break;
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case 'a':
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uart_putc('A');
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uart_print_uint16(voltage_bat);
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uart_putc(',');
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uart_print_uint16(current_in);
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uart_putc(',');
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uart_print_uint16(0);
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uart_putc(',');
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uart_print_uint16(get_power(voltage_bat, current_in));
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uart_putc(',');
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uart_print_uint16(0);
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uart_putc(',');
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uart_putc(48 + (IS_LOAD_ON >> LOADSW));
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uart_putc(',');
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uart_putc(48);
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uart_putc(',');
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uart_putc(48 + (IS_GEN_ON >> GENSW));
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uart_putc('B');
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break;
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}
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}
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}
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int main(void) {
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ports_init();
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adc_init();
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timer_init();
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uart_init(UART_BAUD_SELECT(19200,F_CPU));
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LOAD_OFF;
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GEN_ON;
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while(1) {
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if(syscounter >= 100) {
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syscounter = 0;
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measure();
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//pretty_print_all_values();
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handle_over_and_undervoltage();
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}
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work_uart();
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}
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return(0);
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}
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// system timer
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SIGNAL(TIMER1_COMPA_vect) {
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syscounter++;
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syscounter %= 60000;
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}
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