Compare commits
1 Commits
| Author | SHA1 | Date |
|---|---|---|
 Olaf Rempel
|
cd560f4268 |
6
Makefile
6
Makefile
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@ -1,6 +1,6 @@
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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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MCU_TARGET = attiny24
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OPTIMIZE = -Os
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DEFS =
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@ -47,5 +47,5 @@ bin: $(PRG).bin
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$(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:$(PRG).hex
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# uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=M8 --erase --upload if=$(PRG).hex
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avrdude -p t24 -c butterfly -b 115200 -P /dev/ttyUSB0 -u -e -U flash:w:$(PRG).hex
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340
lipo-charger.c
340
lipo-charger.c
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@ -22,37 +22,21 @@
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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 ADC_REF PORTA0
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#define ADC_U PORTA1
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#define ADC_IM PORTA2
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#define ADC_IP PORTA3
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#define SUMMER PORTA7
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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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#define LEDRT PORTB0
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#define LEDGN PORTB1
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#define PWM PORTB2
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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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/* ADC_U vs GND: voltage with prescaler (12V -> 2V; 15mV -> 2.5mV/bit), ref 2.56V */
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#define CH_U ((1<<REFS0) | 0x01)
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/*
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* power supply:
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* - CH0 - voltage with prescaler (12V -> 2V; 15mV -> 2.5mV/bit)
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* - CH1 - current with (1A -> 1000mV; 2.5mA -> 2.5mV/bit)
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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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/* ADC_IP vs ADC_IM: current sense (1A -> 100mV; ??mA -> ?mV/bit), gain x20, ref 5V */
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#define CH_I ((0<<REFS0) | 0x31)
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#define MOD_WAITING 0x00
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#define MOD_CHARGING 0x01
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@ -60,173 +44,37 @@
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#define VOLTAGE_CONNECT 9000
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#define VOLTAGE_CHARGE 12450
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#define CURRENT_CHARGE 16000
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#define CURRENT_CHARGE 17500
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#define CURRENT_READY 2000
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#define VOLTAGE_REMOVE 1000
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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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if (ADMUX == CH_I) {
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current = ADCW * 25;
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ADMUX = CH0;
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ADMUX = CH_U;
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} else {
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voltage = ADCW * 15;
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ADMUX = CH1;
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ADMUX = CH_I;
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}
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}
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ISR(TIM1_OVF_vect)
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{
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/* Come back in 1ms */
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TCNT1 = 0xFFFF - 8000;
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/* start ADC again */
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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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static uint8_t pwm;
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static uint8_t mode = MOD_WAITING;
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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 1.6A
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*/
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/* charge with constant voltage and current limit */
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if (mode == MOD_CHARGING) {
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if (voltage < (VOLTAGE_CHARGE -25) && current < (CURRENT_CHARGE -500))
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if (pwm < 0xff)
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@ -236,27 +84,71 @@ ISR(TIMER0_OVF_vect)
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if (pwm > 0x00)
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pwm--;
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OCR1A = pwm;
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TCCR1A |= (1<<COM1A1);
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OCR0A = pwm;
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TCCR0A |= (1<<COM1A1);
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} else {
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pwm = 0;
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TCCR1A &= ~(1<<COM1A1);
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TCCR0A &= ~(1<<COM1A1);
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}
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static uint16_t led_timer;
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led_timer = (led_timer +1) & 0x3FF;
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switch (mode) {
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case MOD_WAITING:
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/* green flashing, red off */
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if (led_timer < 0x3F)
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PORTB &= ~(1<<LEDGN);
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else
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PORTB |= (1<<LEDGN) | (1<<LEDRT);
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PORTA |= (1<<SUMMER);
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/* start charging when a voltage > 9V is detected (lipo connected) */
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if (voltage > VOLTAGE_CONNECT)
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mode = MOD_CHARGING;
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break;
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case MOD_CHARGING:
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/* current limit */
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if (voltage < (VOLTAGE_CHARGE -50)) {
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/* green on, red fast blinking */
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if (led_timer & 0x80)
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PORTB &= ~((1<<LEDGN) | (1<<LEDRT));
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else
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PORTB |= (1<<LEDRT);
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/* voltage limit */
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} else {
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/* green on, red slow blinking */
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if (led_timer & 0x200)
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PORTB &= ~((1<<LEDGN) | (1<<LEDRT));
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else
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PORTB |= (1<<LEDRT);
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}
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PORTA |= (1<<SUMMER);
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/* end charging if voltage > 12.45V and current < 200mA */
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if (voltage >= VOLTAGE_CHARGE && current < CURRENT_READY)
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mode = MOD_READY;
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break;
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case MOD_READY:
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/* green on, red flashing */
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if (led_timer < 0x3F)
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PORTB &= ~((1<<LEDGN) | (1<<LEDRT));
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else
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PORTB |= (1<<LEDRT);
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/* beeping */
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if (led_timer < 0x07)
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PORTA &= ~(1<<SUMMER);
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else
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PORTA |= (1<<SUMMER);
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/* wait for lipo disconnect */
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if (voltage < VOLTAGE_REMOVE)
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mode = MOD_WAITING;
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@ -266,89 +158,29 @@ ISR(TIMER0_OVF_vect)
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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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/* digital outputs */
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DDRA = (1<<SUMMER);
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DDRB = (1<<LEDGN) | (1<<LEDRT) | (1<<PWM);
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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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/* analog inputs */
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DIDR0 = (1<<ADC_REF) | (1<<ADC_U) | (1<<ADC_IM) | (1<<ADC_IP);
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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, 8bit Fast PWM (32khz) */
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TCCR0A = (1<<WGM00) | (1<<WGM01);
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TCCR0B = (1<<CS00);
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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 */
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TCCR1B = (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 iimer1 OVF Interrupt */
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TIMSK1 = (1<<TOIE1);
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/* enable ADC with interrupts, 125kHz clk */
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ADMUX = CH_I;
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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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while (1);
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return 0;
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}
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