initial commit
This commit is contained in:
commit
18cb2f29c7
6
.gitignore
vendored
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6
.gitignore
vendored
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*.o
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*.elf
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*.bin
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*.hex
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*.lst
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*.map
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51
Makefile
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51
Makefile
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PRG = lipo-charger
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OBJ = lipo-charger.o
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MCU_TARGET = atmega8
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OPTIMIZE = -Os
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DEFS =
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LIBS =
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# You should not have to change anything below here.
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CC = avr-gcc
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# Override is only needed by avr-lib build system.
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override CFLAGS = -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
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override LDFLAGS = -Wl,-Map,$(PRG).map
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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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all: $(PRG).elf lst text
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$(SIZE) -x -A $(PRG).elf
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$(PRG).elf: $(OBJ)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
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clean:
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rm -rf *.o *.lst *.map $(PRG).elf *.hex *.bin
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lst: $(PRG).lst
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%.lst: %.elf
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$(OBJDUMP) -h -S $< > $@
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# Rules for building the .text rom images
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text: hex bin
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hex: $(PRG).hex
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bin: $(PRG).bin
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%.hex: %.elf
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$(OBJCOPY) -j .text -j .data -O ihex $< $@
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%.bin: %.elf
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$(OBJCOPY) -j .text -j .data -O binary $< $@
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install: text
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uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=M8 --erase --upload if=$(PRG).hex
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# avrdude -p m8 -c butterfly -b 19200 -P /dev/ttyUSB0 -u -e -U flash:w:$(PRG).hex
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354
lipo-charger.c
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354
lipo-charger.c
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/***************************************************************************
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* Copyright (C) 09/2007 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; version 2 of the License, *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#define F_CPU 8000000
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#include <util/delay.h>
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#include <stdio.h>
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#define BAUDRATE 19200
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#define UART_CALC_BAUDRATE(baudRate) ((uint32_t)(F_CPU) / ((uint32_t)(baudRate)*16) -1)
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/*
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* LCD:
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* - CS Chip Select
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* - RS Register Select
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* - RW Read/Write
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*/
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#define RS PORTB6
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#define CS PORTB7
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#define RW PORTD3
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#define LCD_D4 PORTD4
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#define LCD_D5 PORTD5
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#define LCD_D6 PORTD6
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#define LCD_D7 PORTD7
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#define LCD_DATA_MASK ((1<<LCD_D4) | (1<<LCD_D5) | (1<<LCD_D6) | (1<<LCD_D7))
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/*
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* power supply:
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* - CH0 - voltage with 10:1 prescaler
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* - CH1 - current with 10mA -> 1mA
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* - PWM - high-active output to buckconverter
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*/
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#define CH0 PORTC0
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#define CH1 PORTC1
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#define PWM PORTB1
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#define NOP asm volatile ("nop")
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#define MOD_WAITING 0x00
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#define MOD_CHARGING 0x01
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#define MOD_READY 0x02
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static void lcd_wait_busy(void)
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{
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uint8_t status;
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DDRD &= ~(LCD_DATA_MASK);
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PORTD |= (1<<RW);
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do {
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PORTB |= (1<<CS);
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NOP;
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NOP;
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status = (PIND & LCD_DATA_MASK);
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PORTB &= ~(1<<CS);
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PORTB |= (1<<CS);
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NOP;
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NOP;
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status |= ((PIND & LCD_DATA_MASK) >> 4);
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PORTB &= ~(1<<CS);
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} while (status & 0x80);
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DDRD |= LCD_DATA_MASK;
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PORTD &= ~(1<<RW);
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}
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static void lcd_write_ctrl(uint8_t val)
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{
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PORTD &= ~(LCD_DATA_MASK);
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PORTD |= (val & 0xF0);
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PORTB |= (1<<CS);
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NOP;
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NOP;
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PORTB &= ~(1<<CS);
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PORTD &= ~(LCD_DATA_MASK);
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PORTD |= ((val<<4) & 0xF0);
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PORTB |= (1<<CS);
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NOP;
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NOP;
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PORTB &= ~(1<<CS);
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lcd_wait_busy();
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}
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static void lcd_write_data(uint8_t val)
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{
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PORTD &= ~(LCD_DATA_MASK);
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PORTD |= (val & 0xF0);
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PORTB |= (1<<RS);
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PORTB |= (1<<CS);
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NOP;
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NOP;
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PORTB &= ~(1<<CS);
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PORTD &= ~(LCD_DATA_MASK);
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PORTD |= ((val<<4) & 0xF0);
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PORTB |= (1<<CS);
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NOP;
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NOP;
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PORTB &= ~(1<<CS);
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PORTB &= ~(1<<RS);
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lcd_wait_busy();
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}
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/* heartbeat chars */
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static const uint8_t mychars[] = {
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0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x00,
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0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x10, 0x08, 0x04, 0x02, 0x01, 0x00, 0x00,
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};
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static void lcd_init(void)
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{
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_delay_ms(25);
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lcd_wait_busy();
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/* 4bit, 2lines, 5x7 font */
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lcd_write_ctrl(0x28);
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/* display on, cursor off, blink off */
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lcd_write_ctrl(0x0C);
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/* cursor increments */
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lcd_write_ctrl(0x06);
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lcd_write_ctrl(0x40 | 0x00);
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uint8_t i;
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for (i = 0; i < sizeof(mychars); i++)
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lcd_write_data(mychars[i]);
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/* clear & home pos */
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lcd_write_ctrl(0x01);
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}
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static int uart_putchar(char c, FILE *stream)
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{
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if (c == '\n')
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uart_putchar('\r', stream);
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loop_until_bit_is_set(UCSRA, UDRE);
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UDR = c;
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return 0;
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}
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static int lcd_putchar(char c, FILE *stream)
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{
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lcd_write_data(c);
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return 0;
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}
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static FILE lcd = FDEV_SETUP_STREAM(lcd_putchar, NULL, _FDEV_SETUP_WRITE);
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static FILE log = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
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static uint16_t voltage;
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static uint16_t current;
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ISR(ADC_vect)
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{
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if (ADMUX & 0x01) {
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current = ADCW * 25;
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ADMUX = CH0;
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} else {
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voltage = ADCW * 15;
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ADMUX = CH1;
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}
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ADCSRA |= (1<<ADSC);
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}
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static uint8_t lcd_update;
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static uint8_t mode = MOD_WAITING;
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static uint8_t pwm;
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ISR(TIMER0_OVF_vect)
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{
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static uint8_t cnt;
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/* Come back in 1ms */
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TCNT0 = 0xFF - 125;
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/* update LCD every 250ms */
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cnt++;
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if (cnt == 250) {
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cnt = 0;
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lcd_update = 1;
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}
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/*
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* charge with constant voltage of 12.45V
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* and a current limit of 1.6V
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*/
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if (mode == MOD_CHARGING) {
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if (voltage < 12425 && current < 15500)
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if (pwm < 0xff)
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pwm++;
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if (voltage > 12450 || current > 16000)
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if (pwm > 0x00)
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pwm--;
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} else {
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pwm = 0;
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}
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if (pwm > 0) {
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OCR1A = pwm;
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TCCR1A |= (1<<COM1A1);
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} else {
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TCCR1A &= ~(1<<COM1A1);
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}
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switch (mode) {
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case MOD_WAITING:
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/*
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* start charging when a voltage > 9V is detected (lipo connected)
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*/
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if (voltage > 9000)
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mode = MOD_CHARGING;
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break;
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case MOD_CHARGING:
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/*
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* end charging if voltage > 12.42V and current < 200mA
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*/
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if (voltage > 12425 && current < 2000)
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mode = MOD_READY;
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break;
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case MOD_READY:
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/* wait for lipo disconnect */
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if (voltage < 1000)
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mode = MOD_WAITING;
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break;
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}
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}
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int main(void)
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{
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DDRB = (1<<CS) | (1<<RS) | (1<<PWM);
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DDRD = (LCD_DATA_MASK) | (1<<RW);
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/* Set baud rate 19200 */
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UBRRH = (UART_CALC_BAUDRATE(BAUDRATE)>>8) & 0xFF;
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UBRRL = (UART_CALC_BAUDRATE(BAUDRATE) & 0xFF);
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/* USART: rx/tx enable, 19200, 8n1 */
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UCSRB = (1<<TXEN) | (1<<RXEN);
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UCSRC = (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0);
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/* timer0: running with F_CPU/64 (125kHz) */
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TCCR0 = (1<<CS01) | (1<<CS00);
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/* timer1: running with F_CPU, 8bit Phase Correct PWM (16kHz) */
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TCCR1A = (1<<WGM10);
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TCCR1B = (1<<CS10) | (1<<WGM12);
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/* enable Timer0 OVF Interrupt */
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TIMSK = (1<<TOIE0);
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/* external 2.56V reference, channel 0 */
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ADMUX = CH0;
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/* enable ADC with interrupts, 125kHz clk */
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ADCSRA = (1<<ADEN) | (1<<ADSC) | (1<<ADIE) | (1<<ADPS2) | (1<<ADPS1);
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sei();
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lcd_init();
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uint8_t step = 0;
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uint8_t hours = 0, minutes = 0, seconds = 0;
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while (1) {
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if (lcd_update) {
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/* first line, first char */
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lcd_write_ctrl(0x80 | 0x00);
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fprintf(&lcd, "%2d.%03dV ", voltage / 1000, voltage % 1000);
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fprintf(&lcd, "%1d.%04dA ", current / 10000, current % 10000);
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fprintf(&lcd, "0x%02x", pwm);
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step = (step +1) & 0x03;
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if (step == 0 && mode == MOD_CHARGING) {
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seconds++;
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if (seconds == 60) {
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seconds = 0;
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minutes++;
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if (minutes == 60) {
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minutes = 0;
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hours++;
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}
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}
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fprintf(&log, "%02d:%02d:%02d %05d %05d %03d\n",
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hours, minutes, seconds, voltage, current, pwm);
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}
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/* second line, first char */
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lcd_write_ctrl(0x80 | 0x40);
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fprintf(&lcd, "%02d:%02d:%02d ", hours, minutes, seconds);
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switch (mode) {
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case MOD_WAITING:
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fprintf(&lcd, " waiting ");
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hours = minutes = seconds = 0;
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break;
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case MOD_CHARGING:
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fprintf(&lcd, " charging");
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break;
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case MOD_READY:
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fprintf(&lcd, " ready ");
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break;
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}
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/* second line, last char */
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lcd_write_ctrl(0x80 | 0x40 | 19);
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lcd_write_data(step);
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lcd_update = 0;
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}
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}
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return 0;
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}
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