init._c

ICCAVR Rainguage counter program

//ICC-AVR application builder : 14/3/2007 23:29:10
// Target : M16
// Crystal: 7.3728Mhz

#include "config.h"
#include "predef.h"

#define BAUD_RATE 9600
#define BAUD_PRESCALE (((F_CPU / (BAUD_RATE * 16UL))) - 1)

void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0xFD;
DDRB  = 0xB0;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//UART0 initialize
// desired baud rate: 
// actual: baud rate: (0.0%)
// char size: 8 bit
// parity: Disabled
void uart0_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = BIT(URSEL) | 0x06;  //Use 8-bit character sizes - URSEL bit set to select the UCRSC register 
 UBRRL = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value into the low byte of the UBRR register 
UBRRH = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value into the high byte of the UBRR register 
 UCSRB = 0xD8;
}

extern int sendready=1;
#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{
 //uart has received a character in UDR
 unsigned char status,data;
 status=UCSRA;  //get the usart status
 data = UDR;  //put the received character to data variable
 if(data == 'R') {
 sendready = 1;
 }
 
 if((status & (FRAMING_ERROR | DATA_OVERRUN))==0)
  {
  uart_putc(data);
  }
	
}

#pragma interrupt_handler uart0_tx_isr:14
void uart0_tx_isr(void)
{
 //character has been transmitted
}

//SPI initialize
//Master mode
// clock rate: 460799hz
void spi_init(void)
{
 SPCR = 0xD1; //setup SPI
 SPSR = 0x00; //setup SPI
}

#pragma interrupt_handler spi_stc_isr:11
void spi_stc_isr(void)
{
 //byte in SPDR has been sent/received
}


//TIMER0 initialize - prescale:64
// WGM: Normal
// desired value: 1mSec
// actual value:  0.998mSec (0.2%)
void timer0_init(void)
{
 TCCR0 = 0x00; //stop
 TCNT0 = 0x8D; //set count
 OCR0  = 0x73;  //set compare
 TCCR0 = 0x03; //start timer
}


unsigned int count=0; //to count timer0
extern char buffer [33];
char uabuffer [33];
extern int rcount;
#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
 TCNT0 = 0x8D; //reload counter value
 if (++count == 5000)  //1000 ms = 1 Sec
 {
 count = 0;
 if (sendready == 1) {
 uart_puts(buffer);  //put the buffer to the serial
 sendready = 0;
 }
 else {
 //put to the queue buffer
 }
 //reset the counter 1
 TCNT1H=0x00;
 TCNT1L=0x00; 
 }
 
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 uart0_init();
 spi_init();
 timer0_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x01; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}