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avr: include analog comparator and pulse input code into basiciotest

This commit is contained in:
Bart Van Der Meerssche 2010-11-12 10:36:59 +01:00
parent 66e2cebf10
commit 558d74d352
1 changed files with 68 additions and 5 deletions
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73
mote/v2/avr/basiciotest.c
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@ -21,6 +21,9 @@
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
#include <util/delay.h>
#include "uart.h"
#include "spi.h"
@ -40,7 +43,6 @@
#define SPI_FORWARD_TO_UART_PORT 'u'
#define SPI_FORWARD_TO_CTRL_PORT 'l' // 'l'ocal port
volatile uint8_t spi_status, high_hex;
// hex to binary/byte decoding
@ -167,11 +169,43 @@ ISR(TIMER1_COMPA_vect)
/* void */
}
int main(void)
ISR(ANALOG_COMP_vect)
{
uint8_t i;
PORTB |= (1<<PB0);
//disable uC sections to consume less power while writing to EEPROM
//disable UART Tx and Rx:
UCSR0B &= ~((1<<RXEN0) | (1<<TXEN0));
//disable ADC:
ADCSRA &= ~(1<<ADEN);
for (i=0; i<128; i++)
eeprom_write_byte((uint8_t *)i, i);
//enable UART Tx and Rx:
UCSR0B |= (1<<RXEN0) | (1<<TXEN0);
// enable ADC and start a first ADC conversion
ADCSRA |= (1<<ADEN) | (1<<ADSC);
PORTB &= ~(1<<PB0);
}
void setup_pulse_input(void)
{
// PD2=INT0 and PD3=INT1 configuration
// set as input pin with 20k pull-up enabled
PORTD |= (1<<PD2) | (1<<PD3);
// INT0 and INT1 to trigger an interrupt on a falling edge
EICRA = (1<<ISC01) | (1<<ISC11);
// enable INT0 and INT1 interrupts
EIMSK = (1<<INT0) | (1<<INT1);
}
void setup_timer1(void)
{
// Configure PD5=DE as output pin with low as default
DDRD |= (1<<DDD5);
// Timer1 clock prescaler set to 1 => fTOV1 = 3686.4kHz / 65536 = 56.25Hz (DS p.134)
TCCR1B |= (1<<CS10);
// Increase sampling frequency to 2kHz (= 667Hz per channel) with an error of 0.01% (DS p.122)
@ -186,7 +220,32 @@ int main(void)
// Toggle pin OC1A=PB1 on compare match
TCCR1A |= 1<<COM1A0;
#endif
}
void setup_analog_comparator(void)
{
// analog comparator setup for brown-out detection
// PD7=AIN1 configured by default as input to obtain high impedance
// disable digital input cicuitry on AIN0 and AIN1 pins to reduce leakage current
DIDR1 |= (1<<AIN1D) | (1<<AIN0D);
// comparing AIN1 (Vcc/4.4) to bandgap reference (1.1V)
// bandgap select | AC interrupt enable | AC interrupt on rising edge (DS p.243)
ACSR |= (1<<ACBG) | (1<<ACIE) | (1<<ACIS1) | (1<<ACIS0);
}
int main(void)
{
// RS-485: Configure PD5=DE as output pin with low as default
DDRD |= (1<<DDD5);
// set high to transmit
//PORTD |= (1<<PD5);
setup_timer1();
setup_pulse_input();
setup_analog_comparator();
// initialize the CTRL buffers
ctrlInit();
// initialize the UART hardware and buffers
@ -200,6 +259,10 @@ int main(void)
ctrlRxToTxLoop();
spi_status &= ~NEW_CTRL_MSG;
}
// toggle the LED=PB0 pin
_delay_ms(50);
DDRB ^= (1<<PB0);
}
return 0;