uart1_rx

这是本人毕业设计的源码部分,主要完成了步进电机的智能控制:采用AVR系列单片机做主空单元,可红外遥控,其中脉冲分配由CPLD实现.

//ICC-AVR application builder : 2006-5-29 10:32:11
// Target : M128
// Crystal: 8.0000Mhz

#include <iom128v.h>
#include <macros.h>

void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
 PORTE = 0x00;
 DDRE  = 0x00;
 PORTF = 0x00;
 DDRF  = 0x00;
 PORTG = 0x00;
 DDRG  = 0x00;
}

//Watchdog initialize
// prescale: 16K 
void watchdog_init(void)
{
 WDR(); //this prevents a timout on enabling
 WDTCR = 0x08; //WATCHDOG ENABLED - dont forget to issue WDRs
}

//UART1 initialize
// desired baud rate:2400
// actual baud rate:2404 (0.2%)
// char size: 8 bit
// parity: Odd
void uart1_init(void)
{
 UCSR1B = 0x00; //disable while setting baud rate
 UCSR1A = 0x00;
 UCSR1C = 0x36;
 UBRR1L = 0xCF; //set baud rate lo
 UBRR1H = 0x00; //set baud rate hi
 UCSR1B = 0x90;
}

#pragma interrupt_handler uart1_rx_isr:31
void uart1_rx_isr(void)
{
 //uart has received a character in UDR
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 XDIV  = 0x00; //xtal divider
 XMCRA = 0x00; //external memory
 port_init();
 watchdog_init();
 uart1_init();

 MCUCR = 0x80;
 EICRA = 0x00; //extended ext ints
 EICRB = 0x00; //extended ext ints
 EIMSK = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 ETIMSK = 0x00; //extended timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}