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130 lines
2.8 KiB
130 lines
2.8 KiB
#include "twi.h"
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#include "ssd1306.h"
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#include "sevenseg.h"
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#include "adc.h"
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#include "iopins.h"
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#include <avr/interrupt.h>
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const uint16_t adc_target16_acceptable = 900;
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const uint16_t adc_target16 = 972;
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//const uint8_t adc_target8 = 243;
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static bool g_pwm_on = false;
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static volatile uint16_t tick_counter = 0;
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static volatile bool tick_counter_changed = false;
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// Tick
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ISR(INT0_vect)
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{
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tick_counter++;
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tick_counter_changed = true;
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}
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static void init_isr() {
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as_input(D2);
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// using INT0 - arduino pin D2
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EICRA = _BV(ISC01) | _BV(ISC00); // rising edge
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EIMSK = _BV(INT0);
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}
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static void init_pwm_out() {
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// Output is OC0A
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as_output(D5);
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// initialize the timer
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// Fast PWM mode, Output to OC0A
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// clock is 16MHz, presc /64, counting to 80 -> freq 3125Hz
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// Duty cycle = appx. 60%
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OCR0A = 80;
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OCR0B = 46;
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TCCR0A = _BV(WGM00) | _BV(WGM01);
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TCCR0B = _BV(CS01) | _BV(CS00) | _BV(WGM02);
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}
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static void pwm_on() {
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TCCR0A |= _BV(COM0B1);
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g_pwm_on = true;
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}
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static void pwm_off() {
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TCCR0A &= ~_BV(COM0B1);
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g_pwm_on = false;
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}
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void main() {
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TWI_Init();
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adc_init();
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init_pwm_out();
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ssd1306_128x32_i2c_init();
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ssd1306_clearScreen();
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struct SevenSeg sseg = {
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.x0 = 0,
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.y0 = 0,
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.charwidth = 17,
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.thick = 3,
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//.charwidth = 16,
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//.thick = 1,
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.spacing = 4,
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};
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init_isr();
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sei();
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// TODO show loading icon
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sseg_number(&sseg, 0, 5, 0);
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// request ADC meas
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adc_async_start_measure_word(0);
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// uint16_t cnt = 0;
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uint16_t analog;
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uint16_t count_boost_fail = 0;
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for (;;) {
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if (adc_async_ready()) {
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analog = adc_async_get_result_word();
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adc_async_start_measure_word(0);
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bool good_voltage = analog >= adc_target16;
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if (g_pwm_on) {
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if (good_voltage) {
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pwm_off();
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count_boost_fail = 0;
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} else {
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count_boost_fail++;
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}
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}
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else if (!good_voltage) {
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pwm_on();
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}
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// If fail to reach target voltage in reasonable time,
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// show weak battery icon and stop trying.
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if (count_boost_fail > 50000 && analog < adc_target16_acceptable) {
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// TODO weak battery icon
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sseg_number(&sseg, 9999, 5, 0);
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pwm_off();
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for(;;) {}
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}
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// TODO synchronization?
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if (tick_counter_changed) {
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tick_counter_changed = false;
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sseg_number(&sseg, tick_counter, 5, 0);
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}
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// if (++cnt > 10000) {
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// sseg_number(&sseg, analog, 5, 0);
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// cnt = 0;
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// }
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}
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}
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}
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