feat(ex06)

This commit is contained in:
Maix0 2026-04-27 15:46:08 +02:00
parent 53f27e8b46
commit dcf95168e1
31 changed files with 1806 additions and 0 deletions

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ex06/Makefile Normal file
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# Makefile
MCU=atmega328p
F_CPU=16000000
CC=avr-gcc
OBJCOPY=avr-objcopy
WFLAGS=-Wall -Wextra
CFLAGS=--std=c99 -g -Os -mmcu=$(MCU) -ffunction-sections -fdata-sections
CPPFLAGS=-DF_CPU=$(F_CPU) -MMD -Iinclude
IFLAGS=
LDFLAGS=-Wl,--gc-sections
TARGET=main
SERIAL=-P /dev/ttyUSB0 -b 115200
SRC_DIR=src
OBJ_DIR=build
LIB_FILES= \
aht20.c \
i2c.c \
milis.c \
pca9555.c \
pcf8563.c \
rgb.c \
spi.c \
uart.c \
utils.c \
segment.c \
SRC_FILES=main.c \
$(addprefix lib/,$(LIB_FILES))
OBJ_FILES=$(patsubst %.c,%.o,$(SRC_FILES))
DEP_FILES=$(patsubst %.c,%.d,$(SRC_FILES))
SRC=$(addprefix $(SRC_DIR)/,$(SRC_FILES))
OBJ=$(addprefix $(OBJ_DIR)/,$(OBJ_FILES))
DEP=$(addprefix $(OBJ_DIR)/,$(DEP_FILES))
ELF_FILE=$(OBJ_DIR)/$(TARGET).elf
HEX_FILE=$(OBJ_DIR)/$(TARGET).hex
all: flash
re: fclean all
fclean: clean
rm -f $(HEX_FILE)
rm -f $(ELF_FILE)
clean:
rm -rf $(OBJ_DIR)
hex: $(HEX_FILE)
flash: hex
avrdude -p $(MCU) -c arduino -U flash:w:$(HEX_FILE):i $(SERIAL)
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
@mkdir -p $(shell dirname $@)
$(CC) $(CPPFLAGS) $(WFLAGS) $(CFLAGS) $(IFLAGS) -c $< -o $@
$(ELF_FILE): $(OBJ)
$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o $@
$(HEX_FILE): $(ELF_FILE)
$(OBJCOPY) -j .text -j .data -O ihex $< $@
print:
@echo $(SRC)
@echo $(OBJ)
@echo $(ELF_FILE)
@echo $(HEX_FILE)
-include $(DEP);

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#ifndef ADC_H
#define ADC_H
#include <avr/io.h>
#include "lib/mystd.h"
typedef enum e_adc_ref {
ADC_AREF = 0,
ADC_AVCC = BV(REFS0),
ADC_INT = BV(REFS0) | BV(REFS1),
_ADC_REF_MASK = BV(REFS0) | BV(REFS1),
} e_adc_ref;
typedef enum e_adc_size {
ADC_10BIT = 0,
ADC_8BIT = BV(ADLAR),
_ADC_SIZE_MASK = BV(ADLAR),
} e_adc_size;
typedef enum e_adc_prescaler {
ADC_PRESCALER_2 = BV(ADPS0),
ADC_PRESCALER_4 = BV(ADPS1),
ADC_PRESCALER_8 = BV(ADPS1) | BV(ADPS0),
ADC_PRESCALER_16 = BV(ADPS2),
ADC_PRESCALER_32 = BV(ADPS2) | BV(ADPS0),
ADC_PRESCALER_64 = BV(ADPS2) | BV(ADPS1),
ADC_PRESCALER_128 = BV(ADPS2) | BV(ADPS1) | BV(ADPS0),
_ADC_PRESCALER_MASK = BV(ADPS2) | BV(ADPS1) | BV(ADPS0),
} e_adc_prescaler;
typedef enum e_adc_input {
ADC_ADC0 = 0,
ADC_ADC1 = BV(MUX0),
ADC_ADC2 = BV(MUX1),
ADC_ADC3 = BV(MUX0) | BV(MUX1),
ADC_ADC4 = BV(MUX2),
ADC_ADC5 = BV(MUX2) | BV(MUX0),
ADC_ADC6 = BV(MUX2) | BV(MUX1),
ADC_ADC7 = BV(MUX2) | BV(MUX1) | BV(MUX0),
ADC_TEMP = BV(MUX3),
ADC_11V = BV(MUX3) | BV(MUX2) | BV(MUX1),
ADC_0V = BV(MUX3) | BV(MUX2) | BV(MUX1) | BV(MUX0),
_ADC_INPUT_MASK = BV(MUX0) | BV(MUX1) | BV(MUX2) | BV(MUX3),
} e_adc_input;
static inline uint8_t adc_read_pin(e_adc_input input) {
ADMUX = (ADMUX & ~(_ADC_INPUT_MASK | _ADC_SIZE_MASK)) | input | BV(ADLAR);
ADCSRA |= BV(ADSC);
while (ADCSRA & BV(ADSC))
;
return ADCH;
}
static inline uint16_t adc_read_pin_10bit(e_adc_input input) {
ADMUX = (ADMUX & ~(_ADC_SIZE_MASK | _ADC_INPUT_MASK)) | (input & _ADC_INPUT_MASK);
ADCSRA |= BV(ADSC);
while (ADCSRA & BV(ADSC))
;
return ADC;
}
static inline void adc_init(e_adc_ref v_ref, e_adc_prescaler prescaler) {
ADMUX = (ADMUX & ~(_ADC_REF_MASK)) | v_ref;
ADCSRA = BV(ADEN) | (prescaler & _ADC_PRESCALER_MASK);
(void)adc_read_pin(0);
}
#endif /* ADC_H */

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#ifndef AHT20_H
#define AHT20_H
#include <avr/io.h>
#include "lib/mystd.h"
typedef struct aht20_reading {
float temperature;
float humidity;
} aht20_reading;
t_error aht20_read_measure(aht20_reading* out);
t_error aht20_status(uint8_t* out);
t_error aht20_init(void);
t_error aht20_trigger(void);
void aht20_print_status(uint8_t status);
#define AHT20 (0x38)
#endif /* AHT20_H */

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ex06/include/lib/apa102.h Normal file
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#ifndef APA102_H
#define APA102_H
#include <avr/io.h>
#include "lib/mystd.h"
#include "lib/spi.h"
typedef struct rgb {
uint8_t r;
uint8_t g;
uint8_t b;
} rgb;
static inline void apa102_set_colors(rgb col[], uint8_t brightness[], uint8_t length) {
// start frame
for (uint8_t i = 0; i < 4; i++)
spi_write(0x00);
// led data
for (uint8_t i = 0; i < length; i++) {
spi_write(0xE0 + (brightness[i] & 31));
spi_write(col[i].b);
spi_write(col[i].g);
spi_write(col[i].r);
}
// reset frame
for (uint8_t i = 0; i < 4; i++)
spi_write(0xFF);
// End frame: 8+8*(leds >> 4) clock cycles
for (uint8_t i = 0; i < length; i += 16) {
spi_write(0xFF); // 8 more clock cycles
}
}
static inline void apa102_set_color(rgb col, uint8_t brightness) {
apa102_set_colors(&col, &brightness, 1);
}
static inline void apa102_set_all_color(rgb col)
{
rgb cols[3] = {col, col, col};
uint8_t brightness[3] = {31, 31, 31};
apa102_set_colors(cols, brightness, 3);
}
#endif /* APA102_H */

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#ifndef EEPROM_H
#define EEPROM_H
#include <avr/io.h>
#include "lib/interupt.h"
#include "lib/mystd.h"
static inline void eeprom_wait(void) {
while (EECR & BV(EEPE))
;
}
static inline void eeprom_write_single_nocheck(uint16_t addr, uint8_t data) {
uint8_t sreg_save = SREG;
my_cli();
// wait until eeprom is good to go !
eeprom_wait();
while (SPMCSR & BV(SPMEN))
;
// setup the (addr, data) pair
EEAR = addr;
EEDR = data;
// we set the EEPROM master write bit
EECR = (EECR & ~BV(EEPE)) | BV(EEMPE);
// within four cpu cycle, we need to set the EEPROM write bit, otherwise the writes doesnt work
// why 4 ? -> the master bit is reset after 4 cycles, and you need both to actually write
EECR |= BV(EEPE);
// this is the exact setup written in p32
// here the write should be done
SREG = sreg_save;
}
static inline uint8_t eeprom_read_single(uint16_t addr) {
uint8_t sreg_save = SREG;
my_cli();
eeprom_wait();
EEAR = addr;
EECR |= BV(EERE);
SREG = sreg_save;
return EEDR;
}
// true on error
static inline bool eeprom_write_single(uint16_t addr, uint8_t data) {
if (eeprom_read_single(addr) != data)
eeprom_write_single_nocheck(addr, data);
return (eeprom_read_single(addr) != data);
}
// true on error
static inline bool eeprom_write(uint16_t addr, const uint8_t* data, uint16_t length) {
for (uint16_t i = 0; i < length; i++) {
if (eeprom_write_single(addr + i, data[i]))
return true;
}
return false;
}
static inline void eeprom_read(uint16_t addr, uint8_t* data, uint16_t length) {
for (uint16_t i = 0; i < length; i++)
data[i] = eeprom_read_single(addr + i);
}
#endif /* EEPROM_H */

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#ifndef I2C_H
#define I2C_H
#include <avr/io.h>
#include <util/twi.h>
#include "lib/mystd.h"
#define I2C_CLOCK 400000UL
#define I2C_ADDR(ADDR, RW) ((ADDR) << 1 | (RW & 1))
void i2c_init(void);
t_error i2c_start(void);
t_error i2c_stop(void);
t_error i2c_write(uint8_t);
t_error i2c_read_nack(uint8_t* out);
t_error i2c_read_ack(uint8_t* out);
#endif /* I2C_H */

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#ifndef INTERUPT_H
#define INTERUPT_H
#include <avr/io.h>
#include "lib/mystd.h"
static inline void my_sei(void) {
SREG |= BV(SREG_I);
}
static inline void my_cli(void) {
SREG &= ~BV(SREG_I);
}
#endif /* INTERUPT_H */

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ex06/include/lib/milis.h Normal file
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#ifndef MILIS_H
#define MILIS_H
#include "lib/mystd.h"
typedef uint32_t milis_t;
typedef struct {
milis_t until;
} timer_t;
milis_t milis(void);
void milis_init(void);
// return true if the timer is past the time set.
// YOU NEED TO RESET THE TIMER OTHERWISE IT WILL KEEP BEING PENDING
bool timer_wait(timer_t* timer, milis_t ms);
static inline timer_t timer_reset(void) {
return (timer_t){.until = 0};
}
#endif /* MILIS_H */

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ex06/include/lib/mystd.h Normal file
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#ifndef MYSTDINT_H
#define MYSTDINT_H
#include <avr/io.h>
typedef unsigned char uint8_t;
typedef signed char int8_t;
typedef uint8_t bool;
#define true (1)
#define false (0)
#define BV(bit) (1 << bit)
#ifndef NULL
# define NULL ((void*)0)
#endif
typedef bool t_error;
#define ERROR true
#define NO_ERROR false
#define ERR_RET(expr) if (expr) return ERROR
#endif /* MYSTDINT_H */

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#ifndef PCA9555_H
#define PCA9555_H
#include "lib/mystd.h"
#define PCA9555_ADDR 0b0100000
#define PCA9555_INPUT_PORT0 0x00
#define PCA9555_INPUT_PORT1 0x01
#define PCA9555_OUTPUT_PORT0 0x02
#define PCA9555_OUTPUT_PORT1 0x03
#define PCA9555_CONFIG_PORT0 0x06
#define PCA9555_CONFIG_PORT1 0x07
extern uint8_t ADDR_BITS;
static inline uint8_t pca9555_addr(void) {
return PCA9555_ADDR | ADDR_BITS;
}
t_error pca9555_detect_addr(void);
t_error pca9555_read(uint8_t reg, uint8_t* out);
t_error pca9555_write(uint8_t reg, uint8_t value);
t_error pca9555_write_masked(uint8_t reg, uint8_t value, uint8_t mask);
#endif /* PCA9555_H */

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#ifndef PCF8563_H
#define PCF8563_H
#include "lib/i2c.h"
#include "lib/mystd.h"
#define PCF8563address (0x51)
typedef struct pcf8563_date {
uint8_t second;
uint8_t minute;
uint8_t hour;
uint8_t dayOfWeek;
uint8_t dayOfMonth;
uint8_t month;
uint16_t year;
} pcf8563_date;
t_error pcf8563_read_date(pcf8563_date* out);
t_error pcf8563_set_date(pcf8563_date date);
void print_date(pcf8563_date* date);
#endif /* PCF8563_H */

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#ifndef RGB_H
#define RGB_H
#include "lib/mystd.h"
void init_rgb(void);
void set_rgb(uint8_t r, uint8_t g, uint8_t b);
#endif /* RGB_H */

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#ifndef SEGMENT_H
#define SEGMENT_H
#include "lib/mystd.h"
typedef uint8_t segment_digit;
typedef enum {
DIGIT_NONE = 0,
DIGIT_1 = BV((0 + 4)),
DIGIT_2 = BV((1 + 4)),
DIGIT_3 = BV((2 + 4)),
DIGIT_4 = BV((3 + 4)),
DIGIT_ALL = DIGIT_1 | DIGIT_2 | DIGIT_3 | DIGIT_4,
_DIGIT_MASK = DIGIT_ALL,
} segment_mask;
typedef struct {
segment_digit digits[4];
segment_mask mask;
bool enable;
} segment_data;
#define SEG_0 (0b00111111)
#define SEG_1 (0b00000110)
#define SEG_2 (0b01011011)
#define SEG_3 (0b01001111)
#define SEG_4 (0b01100110)
#define SEG_5 (0b01101101)
#define SEG_6 (0b01111101)
#define SEG_7 (0b00000111)
#define SEG_8 (0b01111111)
#define SEG_9 (0b01101111)
#define SEG_a (BV(0))
#define SEG_b (BV(1))
#define SEG_c (BV(2))
#define SEG_d (BV(3))
#define SEG_e (BV(4))
#define SEG_f (BV(5))
#define SEG_g (BV(6))
#define SEG_dp (BV(7))
t_error segment_init(void);
t_error segment_set_digit(segment_digit data, segment_mask digit);
t_error segment_set_mask(segment_mask mask);
t_error segment_refresh_display(void);
void segment_enable(void);
void segment_disable(void);
#endif /* SEGMENT_H */

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#ifndef SPI_H
#define SPI_H
#define SPI_DDR DDRB
#define CS PINB2
#define MOSI PINB3
#define MISO PINB4
#define SCK PINB5
#include "lib/mystd.h"
void spi_init(void);
void spi_uninit(void);
t_error spi_write(uint8_t data);
#endif /* SPI_H */

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#ifndef TIMER0_H
# define TIMER0_H
# include <avr/io.h>
# include "mystd.h"
# include "timer_global.h"
static inline void t0_init_ctc_2(e_timer_prescaler prescaler) {
// Fast PWM (8-bit): WGM22:0 = 0b011
TCCR0A = BV(WGM01);
// reset to zero -> timer off
TCCR0B &= ~(BV(CS02) | BV(CS01) | BV(CS00));
// set the correct prescaler
switch (prescaler) {
case (PRESCALER_1): {
TCCR0B |= (BV(CS00));
break;
}
case (PRESCALER_8): {
TCCR0B |= (BV(CS01));
break;
}
case (PRESCALER_64): {
TCCR0B |= (BV(CS01) | BV(CS00));
break;
}
case (PRESCALER_256): {
TCCR0B |= (BV(CS02));
break;
}
case (PRESCALER_1024): {
TCCR0B |= (BV(CS02) | BV(CS00));
break;
}
case (PRESCALER_OFF): {
break;
}
}
}
static inline void t0_init_fpwm_3(e_timer_prescaler prescaler) {
// Fast PWM (8-bit): WGM22:0 = 0b011
TCCR0A = BV(WGM00) | BV(WGM01);
// reset to zero -> timer off
TCCR0B &= ~(BV(CS02) | BV(CS01) | BV(CS00));
// set the correct prescaler
switch (prescaler) {
case (PRESCALER_1): {
TCCR0B |= (BV(CS00));
break;
}
case (PRESCALER_8): {
TCCR0B |= (BV(CS01));
break;
}
case (PRESCALER_64): {
TCCR0B |= (BV(CS01) | BV(CS00));
break;
}
case (PRESCALER_256): {
TCCR0B |= (BV(CS02));
break;
}
case (PRESCALER_1024): {
TCCR0B |= (BV(CS02) | BV(CS00));
break;
}
case (PRESCALER_OFF): {
break;
}
}
}
static inline void t0_overflow_interrupt(bool enable) {
if (enable)
TIMSK0 |= BV(TOIE0);
else
TIMSK0 &= ~BV(TOIE0);
}
static inline void t0_interrupt(enum e_timer_output output, bool enable) {
if (output & TO_A) {
if (enable)
TIMSK0 |= BV(OCIE0A);
else
TIMSK0 &= ~BV(OCIE0A);
}
if (output & TO_B) {
if (enable)
TIMSK0 |= BV(OCIE0B);
else
TIMSK0 &= ~BV(OCIE0B);
}
}
static inline void t0_set_ocr(enum e_timer_output output, uint8_t value) {
if (output & TO_A)
OCR0A = value;
if (output & TO_B)
OCR0B = value;
}
static inline void t0_set_out_mode(enum e_timer_output output, enum e_timer_output_mode mode) {
if (output & TO_A) {
TCCR0A &= ~(BV(COM0A1) | BV(COM0A0));
switch (mode) {
case (TOM_00): {
break;
}
case (TOM_10): {
TCCR0A |= (BV(COM0A1));
break;
}
case (TOM_01): {
TCCR0A |= (BV(COM0A0));
break;
}
case (TOM_11): {
TCCR0A |= (BV(COM0A1) | BV(COM0A0));
break;
}
}
}
if (output & TO_B) {
TCCR0A &= ~(BV(COM0B1) | BV(COM0B0));
switch (mode) {
case (TOM_00): {
break;
}
case (TOM_10): {
TCCR0A |= (BV(COM0B1));
break;
}
case (TOM_01): {
TCCR0A |= (BV(COM0B0));
break;
}
case (TOM_11): {
TCCR0A |= (BV(COM0B1) | BV(COM0B0));
break;
}
}
}
}
// OC2B => RED => PD3
// OC0B => GREEN => PD5
// OC0A => BLUE => PD6
#endif /* TIMER0_H */
/*
// OC2B = PD3 → output
DDRD |= BV(DDD3) | BV(DDD5) | BV(DDD6);
// Fast PWM (8-bit): WGM22:0 = 0b011
TCCR0A = BV(WGM00) | BV(WGM01);
TCCR0A |= BV(COM0B1);
// 50% duty cycle
OCR0B = 128;
// Start timer, prescaler = 64
TCCR0B = BV(CS02);
*/

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#ifndef TIMER1_H
#define TIMER1_H
#include <avr/io.h>
#include "lib/mystd.h"
#include "lib/timer_global.h"
static inline void t1_init_fpwm_14(e_timer_prescaler prescaler) {
// Fast PWM (8-bit): WGM22:0 = 0b011
TCCR1A = BV(WGM11);
TCCR1B = BV(WGM12) | BV(WGM13);
// set the correct prescaler
switch (prescaler) {
case (PRESCALER_1): {
TCCR1B |= (BV(CS10));
break;
}
case (PRESCALER_8): {
TCCR1B |= (BV(CS11));
break;
}
case (PRESCALER_64): {
TCCR1B |= (BV(CS11) | BV(CS10));
break;
}
case (PRESCALER_256): {
TCCR1B |= (BV(CS12));
break;
}
case (PRESCALER_1024): {
TCCR1B |= (BV(CS12) | BV(CS10));
break;
}
case (PRESCALER_OFF): {
break;
}
}
}
static inline void t1_init_ctc_4(e_timer_prescaler prescaler) {
// CTC mode 4
TCCR1A = 0;
TCCR1B = BV(WGM12);
// set the correct prescaler
switch (prescaler) {
case (PRESCALER_1): {
TCCR1B |= (BV(CS10));
break;
}
case (PRESCALER_8): {
TCCR1B |= (BV(CS11));
break;
}
case (PRESCALER_64): {
TCCR1B |= (BV(CS11) | BV(CS10));
break;
}
case (PRESCALER_256): {
TCCR1B |= (BV(CS12));
break;
}
case (PRESCALER_1024): {
TCCR1B |= (BV(CS12) | BV(CS10));
break;
}
case (PRESCALER_OFF): {
break;
}
}
}
static inline void t1_set_counter(uint16_t val) {
TCNT1 = val;
}
static inline void t1_set_icr1(uint16_t value) {
ICR1 = value;
}
static inline void t1_overflow_interrupt(bool enable) {
if (enable)
TIMSK1 |= BV(TOIE1);
else
TIMSK1 &= ~BV(TOIE1);
}
static inline void t1_interrupt(enum e_timer_output output, bool enable) {
if (output & TO_A) {
if (enable)
TIMSK1 |= BV(OCIE1A);
else
TIMSK1 &= ~BV(OCIE1A);
}
if (output & TO_B) {
if (enable)
TIMSK1 |= BV(OCIE1B);
else
TIMSK1 &= ~BV(OCIE1B);
}
}
static inline void t1_set_ocr(enum e_timer_output output, uint16_t value) {
if (output & TO_A)
OCR1A = value;
if (output & TO_B)
OCR1B = value;
}
static inline void t1_set_out_mode(enum e_timer_output output, enum e_timer_output_mode mode) {
if (output & TO_A) {
TCCR1A &= ~(BV(COM1A1) | BV(COM1A0));
switch (mode) {
case (TOM_00): {
break;
}
case (TOM_10): {
TCCR1A |= (BV(COM1A1));
break;
}
case (TOM_01): {
TCCR1A |= (BV(COM1A0));
break;
}
case (TOM_11): {
TCCR1A |= (BV(COM1A1) | BV(COM1A0));
break;
}
}
}
if (output & TO_B) {
TCCR1A &= ~(BV(COM1B1) | BV(COM1B0));
switch (mode) {
case (TOM_00): {
break;
}
case (TOM_10): {
TCCR1A |= (BV(COM1B1));
break;
}
case (TOM_01): {
TCCR1A |= (BV(COM1B0));
break;
}
case (TOM_11): {
TCCR1A |= (BV(COM1B1) | BV(COM1B0));
break;
}
}
}
}
// OC2B => RED => PD3
// OC0B => GREEN => PD5
// OC0A => BLUE => PD6
#endif /* TIMER1_H */

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#ifndef TIMER2_H
# define TIMER2_H
# include <avr/io.h>
# include "mystd.h"
# include "timer_global.h"
static inline void t2_init_fpwm_3(e_timer_prescaler prescaler) {
// Fast PWM (8-bit): WGM22:0 = 0b011
TCCR2A = BV(WGM20) | BV(WGM21);
// reset to zero -> timer off
TCCR2B &= ~(BV(CS22) | BV(CS21) | BV(CS20));
// set the correct prescaler
switch (prescaler) {
case (PRESCALER_1): {
TCCR2B |= (BV(CS20));
break;
}
case (PRESCALER_8): {
TCCR2B |= (BV(CS21));
break;
}
case (PRESCALER_64): {
TCCR2B |= (BV(CS21) | BV(CS20));
break;
}
case (PRESCALER_256): {
TCCR2B |= (BV(CS22));
break;
}
case (PRESCALER_1024): {
TCCR2B |= (BV(CS22) | BV(CS20));
break;
}
case (PRESCALER_OFF): {
break;
}
}
}
static inline void t2_overflow_interrupt(bool enable) {
if (enable)
TIMSK2 |= BV(TOIE2);
else
TIMSK2 &= ~BV(TOIE2);
}
static inline void t2_interrupt(enum e_timer_output output, bool enable) {
if (output & TO_A) {
if (enable)
TIMSK2 |= BV(OCIE2A);
else
TIMSK2 &= ~BV(OCIE2A);
}
if (output & TO_B) {
if (enable)
TIMSK2 |= BV(OCIE2B);
else
TIMSK2 &= ~BV(OCIE2B);
}
}
static inline void t2_set_ocr(enum e_timer_output output, uint8_t value) {
if (output & TO_A)
OCR2A = value;
if (output & TO_B)
OCR2B = value;
}
static inline void t2_set_out_mode(enum e_timer_output output, enum e_timer_output_mode mode) {
if (output & TO_A) {
TCCR2A &= ~(BV(COM2A1) | BV(COM2A0));
switch (mode) {
case (TOM_00): {
break;
}
case (TOM_10): {
TCCR2A |= (BV(COM2A1));
break;
}
case (TOM_01): {
TCCR2A |= (BV(COM2A0));
break;
}
case (TOM_11): {
TCCR2A |= (BV(COM2A1) | BV(COM2A0));
break;
}
}
}
if (output & TO_B) {
TCCR2A &= ~(BV(COM2B1) | BV(COM2B0));
switch (mode) {
case (TOM_00): {
break;
}
case (TOM_10): {
TCCR2A |= (BV(COM2B1));
break;
}
case (TOM_01): {
TCCR2A |= (BV(COM2B0));
break;
}
case (TOM_11): {
TCCR2A |= (BV(COM2B1) | BV(COM2B0));
break;
}
}
}
}
// OC2B => RED => PD3
// OC0B => GREEN => PD5
// OC0A => BLUE => PD6
#endif /* TIMER0_H */
/*
// OC2B = PD3 → output
DDRD |= BV(DDD3) | BV(DDD5) | BV(DDD6);
// Fast PWM (8-bit): WGM22:0 = 0b011
TCCR2A = BV(GM20) | BV(GM21);
TCCR2A |= BV(COM2B1);
// 50% duty cycle
OCR0B = 128;
// Start timer, prescaler = 64
TCCR2B = BV(CS22);
*/

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#ifndef TIMER_GLOBAL_H
#define TIMER_GLOBAL_H
typedef enum e_timer_prescaler {
PRESCALER_OFF = 0,
PRESCALER_1 = 1,
PRESCALER_8 = 8,
PRESCALER_64 = 64,
PRESCALER_256 = 256,
PRESCALER_1024 = 1024,
} e_timer_prescaler;
typedef enum e_timer_output {
TO_A = (1 << 0),
TO_B = (1 << 1),
} e_timer_output;
typedef enum e_timer_output_mode {
TOM_00,
TOM_01,
TOM_10,
TOM_11,
} e_timer_output_mode;
#endif /* TIMER_GLOBAL_H */

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#ifndef UART_H
#define UART_H
#include "lib/mystd.h"
void uart_init(void);
void uart_tx(char data);
void uart_sendstring(const char* str);
void uart_send_u8(uint8_t val);
void uart_send_u16(uint16_t val);
void uart_send_u32(uint32_t val);
void uart_send_i16(int16_t val);
void uart_send_u8_hex(uint8_t val);
void uart_send_u16_hex(uint16_t val);
static inline void print_hex_value(char c)
{
uart_send_u8_hex(c);
}
char uart_rx(void);
#endif /* UART_H */

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#ifndef UTILS_H
#define UTILS_H
#include "lib/mystd.h"
void delay_ms(uint16_t count);
void ft_bzero(void* data, uint16_t size);
uint8_t ft_stridx(const char* str, char chr);
uint8_t ft_ftoa(float val, char* out, uint16_t precision);
void* ft_memcpy(void* dest, void* src, uint16_t len);
bool ft_memcmp(void* s1, void* s2, uint16_t len);
// return -1 on not hex digit
uint8_t is_hex_digit(char chr);
static inline uint8_t bcdToDec(uint8_t value) {
return ((value / 16) * 10 + value % 16);
}
static inline uint8_t decToBcd(uint8_t value) {
return (value / 10 * 16 + value % 10);
}
#endif /* UTILS_H */

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#include <avr/io.h>
#include <util/delay.h>
#include "lib/aht20.h"
#include "lib/i2c.h"
#include "lib/uart.h"
void aht20_print_status(uint8_t status) {
uart_sendstring("AHT20: ");
uart_sendstring((status & BV(3)) ? "Calibrated" : "Not Calibrated");
uart_sendstring(";");
uart_sendstring((status & BV(7)) ? "Busy" : "Not Busy");
uart_sendstring(";\r\n");
}
// https://datasheet4u.com/pdf/1551700/AHT20.pdf
t_error aht20_init(void) {
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(AHT20, TW_WRITE)));
ERR_RET(i2c_write(0xBE));
ERR_RET(i2c_stop());
return NO_ERROR;
}
t_error aht20_trigger(void) {
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(AHT20, TW_WRITE)));
// trigger measurement command (7.4)
ERR_RET(i2c_write(0xAC));
ERR_RET(i2c_write(0x33));
ERR_RET(i2c_write(0x00));
ERR_RET(i2c_stop());
return NO_ERROR;
}
t_error aht20_read_measure(aht20_reading* out) {
uint8_t data[6];
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(AHT20, TW_READ)));
for (uint8_t i = 0; i < 5; i++)
ERR_RET(i2c_read_ack(&data[i]));
ERR_RET(i2c_read_nack(&data[5]));
// we dont read the checksum
i2c_stop();
uint32_t raw_humi = 0;
uint32_t raw_temp = 0;
struct aht20_reading val;
raw_humi = data[1];
raw_humi <<= 8;
raw_humi += data[2];
raw_humi <<= 4;
raw_humi += data[3] >> 4;
val.humidity = (float)raw_humi / 1048576.0;
raw_temp = data[3] & 0x0f;
raw_temp <<= 8;
raw_temp += data[4];
raw_temp <<= 8;
raw_temp += data[5];
val.temperature = (float)raw_temp / 1048576.0 * 200.0 - 50.0;
*out = val;
return NO_ERROR;
}
t_error aht20_status(uint8_t* out) {
uint8_t status;
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(AHT20, TW_READ)));
ERR_RET(i2c_read_nack(&status));
ERR_RET(i2c_stop());
*out = status & (BV(7) | BV(3));
return NO_ERROR;
}

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#include "lib/mystd.h"
#include <avr/io.h>
#include <util/twi.h>
#include "lib/i2c.h"
static inline t_error i2c_wait(void) {
uint16_t o = 0;
// wait until done
while (!(TWCR & BV(TWINT)) && o < 32768)
o++;
if (o >= 32768)
return ERROR;
return NO_ERROR;
}
void i2c_init(void) {
// clear the status registers
TWSR = 0x00;
// set the i2c clock speed
TWBR = ((F_CPU / I2C_CLOCK) - 16) / 2;
}
t_error i2c_start(void) {
// CLR INT | SET MASTER | ENABLE ;
TWCR = BV(TWINT) | BV(TWSTA) | BV(TWEN);
ERR_RET(i2c_wait());
return NO_ERROR;
}
t_error i2c_stop(void) {
// CLR INT | ENABLE | STOP ;
TWCR = BV(TWINT) | BV(TWEN) | BV(TWSTO);
return NO_ERROR;
}
t_error i2c_write(uint8_t data) {
// set data to write
TWDR = data;
// CLR INT | ENABLE ;
TWCR = BV(TWINT) | BV(TWEN);
ERR_RET(i2c_wait());
return NO_ERROR;
}
t_error i2c_read_ack(uint8_t* out) {
TWCR = BV(TWINT) | BV(TWEN) | BV(TWEA);
ERR_RET(i2c_wait());
*out = TWDR;
return NO_ERROR;
}
t_error i2c_read_nack(uint8_t* out) {
TWCR = BV(TWINT) | BV(TWEN);
ERR_RET(i2c_wait());
*out = TWDR;
return NO_ERROR;
}

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#include <avr/interrupt.h>
#include <avr/io.h>
#include "lib/interupt.h"
#include "lib/milis.h"
#include "lib/mystd.h"
#include "lib/timer1.h"
#include "lib/timer_global.h"
static volatile milis_t TIMER_MS = 0;
void __attribute__((signal, used)) TIMER1_COMPA_vect(void) {
TIMER_MS++;
}
// this function will setup timer1 to increment the global variable TIMER_MS every miliseconds
// this function will enable interupts
void milis_init(void) {
my_sei();
t1_init_ctc_4(PRESCALER_1024);
t1_set_out_mode(TO_A, TOM_00); // do not touch ORC1A
t1_set_ocr(TO_A, (F_CPU / PRESCALER_1024 / 1000) - 1);
t1_interrupt(TO_A, true);
}
milis_t milis(void) {
return TIMER_MS;
}
bool timer_wait(timer_t* timer, milis_t ms) {
if (timer->until == 0) {
timer->until = milis() + ms;
}
return milis() > timer->until;
}

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#include "lib/pca9555.h"
#include "lib/i2c.h"
#include "lib/mystd.h"
uint8_t ADDR_BITS = 0;
t_error pca9555_detect_addr(void) {
uint8_t val;
for (uint8_t i = 0; i < 8; i++) {
ADDR_BITS = i;
if (!pca9555_read(PCA9555_OUTPUT_PORT0, &val)) {
return NO_ERROR;
}
}
return ERROR;
}
t_error pca9555_write(uint8_t reg, uint8_t value) {
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(pca9555_addr(), TW_WRITE))); // write mode
ERR_RET(i2c_write(reg));
ERR_RET(i2c_write(value));
ERR_RET(i2c_stop());
return NO_ERROR;
}
t_error pca9555_read(uint8_t reg, uint8_t* out) {
uint8_t val;
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(pca9555_addr(), TW_WRITE)));
ERR_RET(i2c_write(reg));
ERR_RET(i2c_start()); // repeated start
ERR_RET(i2c_write(I2C_ADDR(pca9555_addr(), TW_READ)));
ERR_RET(i2c_read_nack(&val));
ERR_RET(i2c_stop());
*out = val;
return NO_ERROR;
}
t_error pca9555_write_masked(uint8_t reg, uint8_t value, uint8_t mask) {
uint8_t val;
ERR_RET(pca9555_read(reg, &val));
ERR_RET(pca9555_write(reg, (val & ~mask) | (value & mask)));
return NO_ERROR;
}

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// https://tronixstuff.com/2013/08/13/tutorial-arduino-and-pcf8563-real-time-clock-ic/
// https://www.nxp.com/docs/en/data-sheet/PCF8563.pdf
#include "lib/pcf8563.h"
#include "lib/i2c.h"
#include "lib/uart.h"
#include "lib/utils.h"
t_error pcf8563_read_date(pcf8563_date* out) {
uint8_t bytes[7] = {0};
pcf8563_date ret;
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(PCF8563address, TW_WRITE)));
ERR_RET(i2c_write(0x2));
ERR_RET(i2c_stop());
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(PCF8563address, TW_READ)));
for (uint8_t i = 0; i < 6; i++)
ERR_RET(i2c_read_ack(&bytes[i]));
ERR_RET(i2c_read_nack(&bytes[6]));
ret.second = bcdToDec(bytes[0] & 0b01111111);
ret.minute = bcdToDec(bytes[1] & 0b01111111);
ret.hour = bcdToDec(bytes[2] & 0b00111111);
ret.dayOfMonth = bcdToDec(bytes[3] & 0b00111111);
ret.dayOfWeek = bcdToDec(bytes[4] & 0b00000111);
ret.month = bcdToDec(bytes[5] & 0b00011111);
ret.year = bcdToDec(bytes[6]) + ((bytes[5] & 0b10000000) ? 1900 : 2000);
*out = ret;
return NO_ERROR;
}
t_error pcf8563_set_date(pcf8563_date date) {
ERR_RET(i2c_start());
ERR_RET(i2c_write(I2C_ADDR(PCF8563address, TW_WRITE)));
ERR_RET(i2c_write(0x2));
ERR_RET(i2c_write(decToBcd(date.second)));
ERR_RET(i2c_write(decToBcd(date.minute)));
ERR_RET(i2c_write(decToBcd(date.hour)));
ERR_RET(i2c_write(decToBcd(date.dayOfMonth)));
ERR_RET(i2c_write(decToBcd(date.dayOfWeek)));
uint8_t month = decToBcd(date.month);
if (date.year < 2000)
month |= 0b10000000; // set century bit for 1900s
else
month &= 0b01111111; // clear for 2000s
ERR_RET(i2c_write(month));
ERR_RET(i2c_write(decToBcd(date.year % 100)) /*- ((date.year > 1999) ? 2000 : 1900)))*/);
ERR_RET(i2c_stop());
return NO_ERROR;
}
void pcf8563_print_date(pcf8563_date* date) {
if (date->dayOfMonth < 10)
uart_tx('0');
uart_send_u8(date->dayOfMonth);
uart_tx('/');
if (date->month < 10)
uart_tx('0');
uart_send_u8(date->month);
uart_tx('/');
uart_send_u16(date->year);
uart_tx(' ');
if (date->hour < 10)
uart_tx('0');
uart_send_u8(date->hour);
uart_tx(':');
if (date->minute < 10)
uart_tx('0');
uart_send_u8(date->minute);
uart_tx(':');
if (date->second < 10)
uart_tx('0');
uart_send_u8(date->second);
uart_sendstring("\r\n");
}

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#include <avr/io.h>
#include "lib/mystd.h"
#include "lib/timer0.h"
#include "lib/timer2.h"
#define D5_R PD5
#define D5_G PD6
#define D5_B PD3
#define RGB_MASK (BV(D5_R) | BV(D5_G) | BV(D5_B))
void init_rgb(void) {
t0_init_fpwm_3(PRESCALER_64);
t2_init_fpwm_3(PRESCALER_64);
t0_set_out_mode(TO_A | TO_B, TOM_00);
t2_set_out_mode(TO_B, TOM_00);
DDRD |= RGB_MASK;
}
void set_rgb(uint8_t r, uint8_t g, uint8_t b) {
if (r == 0x00) {
t0_set_out_mode(TO_B, TOM_00);
PORTD = (PORTD & ~BV(D5_R));
} else {
t0_set_out_mode(TO_B, TOM_10);
t0_set_ocr(TO_B, r);
}
if (g == 0x00) {
t0_set_out_mode(TO_A, TOM_00);
PORTD = (PORTD & ~BV(D5_G));
} else {
t0_set_out_mode(TO_A, TOM_10);
t0_set_ocr(TO_A, g);
}
if (b == 0x00) {
t2_set_out_mode(TO_B, TOM_00);
PORTD = (PORTD & ~BV(D5_B));
} else {
t2_set_out_mode(TO_B, TOM_10);
t2_set_ocr(TO_B, b);
}
}

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#include "lib/segment.h"
#include "lib/mystd.h"
#include "lib/pca9555.h"
#include "lib/timer2.h"
#include "lib/uart.h"
static segment_data SEGMENT_DATA = {};
t_error segment_init(void) {
ERR_RET(pca9555_detect_addr());
ERR_RET(pca9555_write_masked(PCA9555_CONFIG_PORT0, 0b00000000, 0b11110000));
ERR_RET(pca9555_write_masked(PCA9555_CONFIG_PORT1, 0x00, 0xFF));
return NO_ERROR;
}
t_error segment_set_digit(segment_digit data, segment_mask digit) {
if (digit & DIGIT_1)
SEGMENT_DATA.digits[0] = data;
if (digit & DIGIT_2)
SEGMENT_DATA.digits[1] = data;
if (digit & DIGIT_3)
SEGMENT_DATA.digits[2] = data;
if (digit & DIGIT_4)
SEGMENT_DATA.digits[3] = data;
return NO_ERROR;
}
t_error segment_set_mask(segment_mask mask) {
SEGMENT_DATA.mask = mask;
return NO_ERROR;
}
t_error segment_refresh_display(void) {
if (!SEGMENT_DATA.enable)
return NO_ERROR;
t_error ret = NO_ERROR;
for (uint8_t idx = 0; idx < 4; idx++) {
if (!(SEGMENT_DATA.mask & BV((idx + 4))))
continue;
// we set the digit selector to none such that when we update the digits pin -> we dont
// update digits we dont want
ret |= pca9555_write_masked(PCA9555_OUTPUT_PORT0, 0b11110000, 0b11110000);
ret |= pca9555_write(PCA9555_OUTPUT_PORT1, SEGMENT_DATA.digits[idx]);
ret |= pca9555_write_masked(PCA9555_OUTPUT_PORT0, ~BV((idx + 4)), 0b11110000);
}
return ret;
}
void segment_enable(void) {
SEGMENT_DATA.enable = true;
}
void segment_disable(void) {
SEGMENT_DATA.enable = false;
}

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#include <avr/io.h>
#include "lib/mystd.h"
#include "lib/spi.h"
void spi_init(void) {
// set the correct pins as output
SPI_DDR |= BV(CS) | BV(MOSI) | BV(SCK);
// enable SPI, set as master, and clock to fosc/128
SPCR = BV(SPE) | BV(MSTR) | BV(SPR1) | BV(SPR0);
}
void spi_uninit(void) {
SPCR = 0;
}
t_error spi_write(uint8_t data) {
uint16_t o = 0;
// load data into register
SPDR = data;
// Wait for transmission complete
while (!(SPSR & BV(SPIF)) && o < 32768)
o++;
if (o >= 32768)
return ERROR;
return NO_ERROR;
}

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#include "lib/uart.h"
#include <avr/io.h>
#include "lib/mystd.h"
#include "lib/utils.h"
#define BAUD_RATE 115200
#define UBRR_VALUE ((F_CPU / (8UL * BAUD_RATE)) - 1)
// uart is 115200 baud rate, 8 bits per word, no parrity and 1 stop bit
// 115200 8N1
void uart_init(void) {
// Set baud rate
UBRR0H = (uint8_t)(UBRR_VALUE >> 8);
UBRR0L = (uint8_t)(UBRR_VALUE);
UCSR0A |= BV(U2X0);
// Enable transmitter
UCSR0B = BV(TXEN0) | BV(RXEN0);
// Set frame format: 8 data bits, no parity, 1 stop bit
UCSR0C = BV(UCSZ01) | BV(UCSZ00);
// Set TX (PD1) as output
DDRD |= BV(PD1);
}
void uart_tx(char data) {
// wait for transmit buffer to be empty
while (!(UCSR0A & BV(UDRE0)))
;
// load data into transmit register
UDR0 = data;
}
char uart_rx(void) {
while (!(UCSR0A & BV(RXC0)))
;
return UDR0;
}
void uart_sendstring(const char* str) {
if (!str)
return;
while (*str) {
uart_tx(*str);
str++;
}
}
void uart_send_u8(uint8_t val) {
if (val == 0)
return uart_tx('0');
char buf[4] = {0, 0, 0, 0};
uint8_t idx = 0;
bool print = false;
uint8_t modulus = 100;
while (modulus) {
uint8_t digit = val / modulus;
if (print || digit != 0) {
print = true;
buf[idx++] = '0' + digit;
}
val %= modulus;
modulus /= 10;
}
uart_sendstring(buf);
}
void uart_send_u16(uint16_t val) {
if (val == 0)
return uart_tx('0');
char buf[6] = {0, 0, 0, 0, 0, 0};
uint8_t idx = 0;
bool print = false;
uint16_t modulus = 10000;
while (modulus) {
uint8_t digit = val / modulus;
if (print || digit != 0) {
print = true;
buf[idx++] = '0' + digit;
}
val %= modulus;
modulus /= 10;
}
uart_sendstring(buf);
}
void uart_send_i16(int16_t val) {
if (val == 0)
return uart_tx('0');
if (val == -32768)
return uart_sendstring("-32768");
if (val < 0) {
uart_tx('-');
val = -val;
}
uart_send_u16(val);
}
void uart_send_u32(uint32_t val) {
if (val == 0)
return uart_tx('0');
char buf[11] = {};
uint8_t idx = 0;
bool print = false;
uint32_t modulus = 1000000000;
while (modulus) {
uint8_t digit = val / modulus;
if (print || digit != 0) {
print = true;
buf[idx++] = '0' + digit;
}
val %= modulus;
modulus /= 10;
}
uart_sendstring(buf);
}
void uart_send_u8_hex(uint8_t val) {
char buf[3] = {0, 0, 0};
buf[0] = "0123456789abcdef"[(val >> 4) & 0x0F];
buf[1] = "0123456789abcdef"[(val >> 0) & 0x0F];
uart_sendstring(buf);
}
void uart_send_u16_hex(uint16_t val) {
char buf[5] = {0, 0, 0, 0, 0};
buf[0] = "0123456789abcdef"[(val >> 12) & 0x0F];
buf[1] = "0123456789abcdef"[(val >> 8) & 0x0F];
buf[2] = "0123456789abcdef"[(val >> 4) & 0x0F];
buf[3] = "0123456789abcdef"[(val >> 0) & 0x0F];
uart_sendstring(buf);
}

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#include "lib/utils.h"
#include "lib/mystd.h"
#include "lib/uart.h"
// this just burns cycles.
// the volatile is important, it means that the cpu can't optimize any
// read/writes for the value
static inline void spin_loop(volatile uint16_t counts) {
while (counts)
counts--;
}
void delay_ms(uint16_t ms) {
while (ms) {
// this value was taken using a delay of 500ms, and just recording the led
// blinking. it seems to be high enough such that each loop of delay_loop
// takes 1ms :D
spin_loop((F_CPU) / 5000);
ms--;
}
}
void ft_bzero(void* data, uint16_t size) {
char* d = data;
while (size) {
*d = 0;
d++;
size--;
}
}
uint8_t ft_stridx(const char* str, char chr) {
if (!str)
return -1;
for (uint8_t i = 0; str[i]; i++) {
if (str[i] == chr)
return i;
}
return -1;
}
static float ft_pow(float base, float count) {
float out = 1;
while (count--)
out *= base;
return out;
}
// Reverses a string 'str' of length 'len'
static void reverse(char* str, uint16_t len) {
uint16_t i = 0, j = len - 1, temp;
while (i < j) {
temp = str[i];
str[i] = str[j];
str[j] = temp;
i++;
j--;
}
}
static uint16_t ft_itoa(uint32_t value, char* out, uint16_t width) {
uint16_t i = 0;
if (value == 0) {
while (i < width)
out[i++] = '0';
return i;
}
while (value) {
out[i++] = (value % 10) + '0';
value = value / 10;
}
// If number of digits required is more, then
// add 0s at the beginning
while (i < width)
out[i++] = '0';
// we need to reverse the data
reverse(out, i);
out[i] = 0;
return i;
}
// 0.3250351
// Converts a floating-point/double number to a string.
uint8_t ft_ftoa(float val, char* out, uint16_t precision) {
uint32_t ipart = (uint32_t)val;
float fpart = val - (float)ipart;
// convert integer part to string
uint8_t i = ft_itoa(ipart, out, 1);
if (precision != 0) {
out[i] = '.';
fpart = fpart * ft_pow(10.f, precision);
i += ft_itoa((uint32_t)fpart, &out[i + 1], precision);
}
return i;
}
void* ft_memcpy(void* dest, void* src, uint16_t len) {
for (uint16_t i = 0; i < len; i++)
((uint8_t*)dest)[i] = ((uint8_t*)src)[i];
return dest;
}
bool ft_memcmp(void* s1, void* s2, uint16_t len) {
for (uint16_t i = 0; i < len; i++) {
if (((uint8_t*)s1)[i] != ((uint8_t*)s2)[i])
return false;
}
return true;
}
uint8_t is_hex_digit(char chr) {
uint8_t i;
if ((i = ft_stridx("0123456789", chr)) != 255)
return i;
if ((i = ft_stridx("abcdef", chr)) != 255)
return 10 + i;
if ((i = ft_stridx("ABCDEF", chr)) != 255)
return 10 + i;
return 255;
}

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#include <avr/io.h>
#include <util/delay.h>
#include "lib/adc.h"
#include "lib/aht20.h"
#include "lib/apa102.h"
#include "lib/eeprom.h"
#include "lib/i2c.h"
#include "lib/milis.h"
#include "lib/mystd.h"
#include "lib/pca9555.h"
#include "lib/pcf8563.h"
#include "lib/rgb.h"
#include "lib/segment.h"
#include "lib/spi.h"
#include "lib/uart.h"
#include "lib/utils.h"
#define tabsize(tab) (sizeof(tab) / sizeof(tab[0]))
segment_digit seg_digits[10] = {
SEG_0, SEG_1, SEG_2, SEG_3, SEG_4, SEG_5, SEG_6, SEG_7, SEG_8, SEG_9,
};
int main(void) {
milis_init();
uart_init();
i2c_init();
pca9555_detect_addr();
segment_init();
adc_init(ADC_AVCC, ADC_PRESCALER_64);
segment_set_mask(DIGIT_ALL);
segment_set_digit(SEG_0, DIGIT_ALL);
segment_enable();
timer_t adc_timer = timer_reset();
while (1) {
if (timer_wait(&adc_timer, 10)) {
uint16_t val = adc_read_pin_10bit(ADC_ADC0);
adc_timer = timer_reset();
segment_set_digit(seg_digits[(val / 1000) % 10], DIGIT_1);
segment_set_digit(seg_digits[(val / 100) % 10], DIGIT_2);
segment_set_digit(seg_digits[(val / 10) % 10], DIGIT_3);
segment_set_digit(seg_digits[(val / 1) % 10], DIGIT_4);
}
segment_refresh_display();
}
}