Started work on firmware
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7c24554978
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bin
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AVRMCU ?= atmega8
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F_CPU ?= 16000000
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ISPPORT ?= /dev/kaboard
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VERSION = 0.1
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HEADERS = include/twi.h
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SRC = main.c twi.c
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TARGET = cube-kl
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OBJDIR = bin
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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SIZE = avr-size
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OBJ = $(SRC:%.c=$(OBJDIR)/$(AVRMCU)/%.o)
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CFLAGS = -I include -I images -I fonts -Os -Wall -Wstrict-prototypes
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CFLAGS += -ffunction-sections -fdata-sections
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CFLAGS += -fshort-enums -fpack-struct -funsigned-char -funsigned-bitfields
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CFLAGS += -mmcu=$(AVRMCU) -DF_CPU=$(F_CPU)UL -DVERSION=$(VERSION)
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LDFLAGS = -mmcu=$(AVRMCU) -Wl,--gc-sections
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all: start $(OBJDIR)/$(AVRMCU)/$(TARGET).hex size
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@echo ":: Done !"
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start:
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@echo "cube-kl firmware $(VERSION)"
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@echo "==========================="
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@echo ":: Building for $(AVRMCU)"
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@echo ":: MCU operating frequency is $(F_CPU)Hz"
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$(OBJDIR)/$(AVRMCU)/%.o : %.c $(HEADERS) Makefile
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@mkdir -p $$(dirname $@)
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$(CC) $(CFLAGS) -c $< -o $@
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$(OBJDIR)/$(AVRMCU)/$(TARGET).elf : $(OBJ)
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$(CC) $(LDFLAGS) $+ -o $@
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$(OBJDIR)/$(AVRMCU)/$(TARGET).hex : $(OBJDIR)/$(AVRMCU)/$(TARGET).elf
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$(OBJCOPY) -O ihex $< $@
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size : $(OBJDIR)/$(AVRMCU)/$(TARGET).elf
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@echo
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@$(SIZE) --mcu=$(AVRMCU) -C $(OBJDIR)/$(AVRMCU)/$(TARGET).elf
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@echo
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clean :
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@rm -rf $(OBJDIR)
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flash : all
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avrdude -c arduino \
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-p $(AVRMCU) -P $(ISPPORT) \
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-U flash:w:$(OBJDIR)/$(AVRMCU)/$(TARGET).hex
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#ifndef __TWI_H__
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#define __TWI_H__ __TWI_H__
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#include <stdint.h>
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#include <util/twi.h>
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void twi_init(void);
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uint8_t twi_write(uint8_t address, uint8_t data[], uint8_t len);
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#endif
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#include <avr/io.h>
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#include <util/delay.h>
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#include "twi.h"
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int main(void) {
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twi_init();
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while(1) {
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uint8_t data[] = {'T','E','S','T'};
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twi_write(96, data, 4);
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_delay_ms(10);
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}
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while(1);
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}
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#include "twi.h"
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void twi_init() {
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// bitrate = 1600000MHz / (16 + 2 * TWBR * 4^TWPS)
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// Overall prescaler 40 = 16 + 2 * 3 * 4^1
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TWBR = 3; // 2 * 3 = 6
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TWSR |= (1 << TWPS0); // 4
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}
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uint8_t twi_start(void) {
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// Enable internal pull-ups
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PORTC |= (1 << PC5) | (1 << PC4);
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// Setup for sending start condition, trigger sending, keep TWI enabled
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TWCR |= (1 << TWSTA) | (1 << TWINT) | (1 << TWEN);
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// Poll for TWI unit to finish
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while(!(TWCR & (1 << TWINT)));
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// Check if start was succesfull
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return (TW_STATUS != TW_START);
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}
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void twi_stop(void) {
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// Setup for sending stop condition, trigger sending, keep TWI enabled
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TWCR = (1 << TWSTO) | (1 << TWINT) | (1 << TWEN);
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}
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uint8_t twi_write(uint8_t address, uint8_t data[], uint8_t len) {
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// Send start condition
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if(twi_start()) {
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return 1;
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}
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TWDR = address | TW_WRITE; // We want to write to the slave
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TWCR = (1 << TWINT) | (1 << TWEN); // Trigger transmission, keep TWI enabled
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// Wait for TWI unit to finish
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while(!(TWCR & (1 << TWINT)));
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// Make sure the slave has acked
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if(TW_STATUS != TW_MT_SLA_ACK) {
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return 1;
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}
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for(uint8_t i = 0; i < len; i++) {
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TWDR = data[i]; // Send actual data
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TWCR = (1 << TWINT ) | (1 << TWEN); // Trigger transmission, keep TWI enabled
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// Wait for TWI unit to finish
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while(!(TWCR & (1 << TWINT)));
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// Make sure the data has been acked
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if(TW_STATUS != TW_MT_DATA_ACK) {
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return 1;
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}
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}
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// Send stop condition
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twi_stop();
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return 0;
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}
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