134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
#include <avr/io.h>
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#include <util/delay.h>
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// stringify
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#define STRINGIFY_HELPER(x) #x
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#define STRINGIFY(x) STRINGIFY_HELPER(x)
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// concatenate
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#define CONCAT_HELPER(x, y) x ## y
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#define CONCAT(x, y) CONCAT_HELPER(x, y)
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// get argument
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#define ARG_1(v1, v2) v1
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#define ARG_2(v1, v2) v2
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#define GET_PORT(args) ARG_1 args
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#define GET_BIT(args) ARG_2 args
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// actions on registers
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#define SET(register, bit) register |= 1 << bit
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#define CLEAR(register, bit) register &= ~(1 << bit)
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#define TEST(register, bit) register & 1 << bit
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#define TOGGLE(register, bit) register ^= 1 << bit
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// actions on elements
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#define SET_ELEM(elem) SET(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define CLEAR_ELEM(elem) CLEAR(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define TEST_ELEM(elem) TEST(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define TOGGLE_ELEM(elem) TOGGLE(CONCAT(PORT, GET_PORT(elem)), GET_BIT(elem))
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#define MODE_OUTPUT(elem) SET(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
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#define MODE_INPUT(elem) CLEAR(CONCAT(DDR, GET_PORT(elem)), GET_BIT(elem))
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#define TOGGLE_PIN(elem) SET(CONCAT(PIN, GET_PORT(elem)), GET_BIT(elem))
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#define TEST_PIN(elem) (TEST(CONCAT(PIN, GET_PORT(elem)), GET_BIT(elem)))
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#define IS_PIN_SET(elem) (TEST_PIN(elem) == 0)
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#define IS_PIN_CLEAR(elem) (TEST_PIN(elem) == 1)
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// bits
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#define D1 0
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#define D2 1
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#define D3 2
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#define D4 4
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#define SW1 2
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#define SW2 4
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// elements (port, bit)
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#define LED1 (B, D1)
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#define LED2 (B, D2)
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#define LED3 (B, D3)
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#define LED4 (B, D4)
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#define BUTTON1 (D, SW1)
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#define BUTTON2 (D, SW2)
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// TIME
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#define PRESCALE_VALUE 1024 // can be 1, 8, 64, 256, 1024
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// table 16-5 : prescale sets
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#define PRESCALE_SET(value) \
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((value) == 1 ? (0<<CS12 | 0<<CS11 | 1<<CS10) : \
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(value) == 8 ? (0<<CS12 | 1<<CS11 | 0<<CS10) : \
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(value) == 64 ? (0<<CS12 | 1<<CS11 | 1<<CS10) : \
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(value) == 256 ? (1<<CS12 | 0<<CS11 | 0<<CS10) : \
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(value) == 1024? (1<<CS12 | 0<<CS11 | 1<<CS10) : \
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(0<<CS12 | 0<<CS11 | 0<<CS10))
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#define TIME_MS(ms) (((F_CPU / PRESCALE_VALUE) * ms) / 1000)
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#define PERIOD 1000
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#define DUTY_CYCLE 10
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#define PERCENT(percent, period) (((float)percent / 100) * period)
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// Table 16-4 : Waveform Generation Mode Bit Description
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#define CTC_TOP_OCR1A_IN_TCCR1B (0<<WGM13 | 1<<WGM12)
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#define CTC_TOP_OCR1A_IN_TCCR1A (0<<WGM11 | 0<<WGM10)
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#define CTC_TOP_ICR1_IN_TCCR1B (1<<WGM13 | 1<<WGM12)
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#define CTC_TOP_ICR1_IN_TCCR1A (0<<WGM11 | 0<<WGM10)
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#define FAST_PWM_TOP_OCR1A_IN_TCCR1B (1<<WGM13 | 1<<WGM12)
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#define FAST_PWM_TOP_OCR1A_IN_TCCR1A (1<<WGM11 | 1<<WGM10)
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#define FAST_PWM_TOP_ICR1_IN_TCCR1B (1<<WGM13 | 1<<WGM12)
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#define FAST_PWM_TOP_ICR1_IN_TCCR1A (1<<WGM11 | 0<<WGM10)
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// END MACROS
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typedef struct {
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int duty_cycle;
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int max;
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int min;
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} IncrementParams;
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void increment_duty_cycle(void *param) {
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IncrementParams *params = (IncrementParams *)param;
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if(params->duty_cycle < params->max) {
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params->duty_cycle += 10;
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}
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OCR1A = TIME_MS(PERCENT(params->duty_cycle, PERIOD));
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}
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void decrement_duty_cycle(void *param) {
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IncrementParams *params = (IncrementParams *)param;
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if(params->duty_cycle > params->min) {
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params->duty_cycle -= 10;
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}
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OCR1A = TIME_MS(PERCENT(params->duty_cycle, PERIOD));
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}
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void on_press(int bit, void (*action)(void*), void *params) {
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if ((TEST(PIND, bit)) == 0) {
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action(params);
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_delay_ms(20);
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while ((TEST(PIND, bit)) == 0) {
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continue;
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}
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_delay_ms(20);
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}
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}
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int main() {
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int duty_cycle = DUTY_CYCLE;
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int max = 100;
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int min = 0;
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IncrementParams params = {duty_cycle, max, min};
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MODE_OUTPUT(LED2);
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TCCR1A |= FAST_PWM_TOP_ICR1_IN_TCCR1A; // Table 16-4 : set timer in Fast PWM (Pulse With Modulation) mode with TOP = ICR1 (Mode 14)
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TCCR1B |= FAST_PWM_TOP_ICR1_IN_TCCR1B;
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SET(TCCR1A, COM1A1); // Table 16-2 : non-inverting mode, the LED will be ON for DUTY_CYCLE% of the time (CLEAR OC1A on compare match, SET OC1A at BOTTOM)
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ICR1 = TIME_MS(PERIOD); // Table 16-4 : set the period (compare TOP value)
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OCR1A = TIME_MS(PERCENT(DUTY_CYCLE, PERIOD)); // 16.9.3 : set the duty cycle to DUTY_CYCLE% of the time in channel A -> OC1A (alternate function of PORTB1, aka LED2) is cleared when TCNT1 (the counter value) equals OCR1A
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TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE)); // start the timer with the prescaler
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while(1) {
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on_press(SW1, increment_duty_cycle, ¶ms);
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on_press(SW2, decrement_duty_cycle, ¶ms);
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}
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} |