#include <util/twi.h>
#include <avr/eeprom.h>
#include <avr/wdt.h>
+#include <avr/pgmspace.h>
#include "uart.h"
/*
* 0x0A Voltage LSB
* 0x0B Distance forward2 MSB
* 0x0C Distance forward2 LSB
+ * 0x0D Current MSB
+ * 0x0E Current LSB
*
* 0x15 Distance forward1 MSB (read only)
* 0x16 Distance forward1 LSB (read only)
static volatile uint8_t start_dist_fwd2=0;
static volatile uint8_t start_dist_bwd=0;
static volatile uint16_t voltage=0;
+static volatile uint16_t current=0;
static volatile uint8_t pind_pre=0;
ISR(TWI_vect)
default:
TWI_NAK;
}
- ireg++;
+ if (ireg < 0xff) ireg++;
break;
case TW_ST_SLA_ACK: // start read
case TW_ST_DATA_ACK: // read
TWDR = tmp16;
TWI_ACK;
break;
+ case 0x0D: // Current MSB
+ tmp16 = current;
+ TWDR = tmp16>>8;
+ TWI_ACK;
+ break;
+ case 0x0E: // Current LSB
+ TWDR = tmp16;
+ TWI_ACK;
+ break;
case 0x15: // Distance forward1 MSB
tmp16 = dist_forward1;
TWDR = tmp16>>8;
}
+/*
+ * zero offset: 0.5V
+ * sensitivity: 133mV/A
+ */
+static unsigned short get_current(void) {
+ double volt = ReadChannel(3)*5.0171; // mV
+ return (volt-517.78)/0.12656; // mA
+}
+
+
ISR(INT0_vect) {
static uint16_t t_start=0;
uint16_t t_now = TCNT1;
EICRA = (1 << ISC10) | (1 << ISC00);
PCICR = (1 << PCIE2);
- printf("\r\nStart\r\n");
+ printf_P(PSTR("\r\nStart\r\n"));
set_sleep_mode(SLEEP_MODE_IDLE);
sei();
case 0x09: // voltage
voltage = get_voltage();
break;
+ case 0x0d: // current
+ current = get_current();
+ break;
case 0xff: // Magic reg that starts the bootloader
if (bootloader == 0xa5) {
cli();