Question

atmega_16.h

#ifndef _AVR_INTERFACE_
#define _AVR_INTERFACE_

#include <io.h>
#include <stdio.h>

void ms_delay ( double delay );
void us_delay ( double delay );

#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1);


void usart_init ( void );
void usart_putch ( unsigned char send );
unsigned int usart_getch ( void );
void usart_send_string ( const char* data );

void spi_init ( void );
void spi_init_2x ( void );
void spi_tx ( unsigned char data );
unsigned char spi_rx ( void );

void avr_lcd_port_init ( void );
void avr_lcdcmd ( char cmdout );
void avr_lcddata ( char dataout );

void sdsc_pin_assert ( void );
void sdsc_pin_deassert ( void );

void uart_print (char cc,FILE* streamm); //syntax error for this declare

#endif

atmega_16.c

#include "atmega_16.h"
#include "atmega_16_config.h"
//  int uart_print ( char c, FILE *stream);
#ifdef SERIAL_DEBUG 
//============================ SERIAL DEBUG ROUTINES =================================//
                FILE uart_out= FDEV_SETUP_STREAM( uart_print, NULL, _FDEV_SETUP_WRITE );

//============================ SERIAL DEBUG ROUTINES =================================//
#endif

#ifdef USART 
//================================ USART ROUTINES ===================================//
void uart_print(char cc,FILE* streamm)
{
  if ( cc == '\n' )
    uart_print ( '\r', streamm );
  loop_until_bit_is_set ( UCSRA, UDRE );
  UDR = cc;
 // return 0;
}        
void usart_init ( void )
{
    UCSRB |= ( 1 << RXCIE ) | ( 1 << RXEN ) | ( 1 << TXEN );       // Turn on the transmission reception ..
                                // circuitry and receiver interrupt
    UCSRC |= ( 1 << URSEL ) | ( 1 << UCSZ0 ) | ( 1 << UCSZ1 ); // Use 8-bit character sizes

    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

    #ifdef SERIAL_DEBUG 
    stdout = &uart_out;
    #endif
}

void usart_putch ( unsigned char send )
{
    while ( ( UCSRA & ( 1 << UDRE ) ) == 0 ); // Do nothing until UDR is ready..
    // for more data to be written to it
    UDR = send; // Send the byte 
}

unsigned int usart_getch ( void )
{
    while ( ( UCSRA & ( 1 << RXC ) ) == 0 );
    // Do nothing until data have been received and is ready to be read from UDR
    return ( UDR ); // return the byte
}

void usart_send_string ( const char* data )
{
    for( ; *data; data ++ )
        usart_putch ( *data );
}
//================================ USART ROUTINES ===================================//
#endif


#ifdef LCD 
//================================= LCD ROUTINES ===================================//
void avr_lcd_port_init ( void )
{
    DDRA = 0xFF;
}

void avr_lcdcmd ( char cmdout )
{
    PORTA = cmdout;
    PORTA &= ~ ( 1 << rs );
    PORTA &= ~ ( 1 << rw );
    PORTA |= ( 1<< en );
    ms_delay ( 1 );
    PORTA &= ~ ( 1 << en );
}

void avr_lcddata ( char dataout )
{
    PORTA = dataout;
    PORTA |= ( 1 << rs );
    PORTA &= ~ ( 1 << rw );
    PORTA |= ( 1 << en );
    ms_delay ( 1 );
    PORTA &= ~ ( 1 << en );
}
//================================= LCD ROUTINES ===================================//
#endif

#ifdef SPI
//================================= SPI ROUTINES ===================================//
void spi_init ( void )
{
//master,little endian, SCK phase low, SCK idle low//
    DDRB  = 0xBF; 
    SPCR = 0x52; 
    SPSR = 0x00;

    ms_delay ( 10 );
}

void spi_init_2x ( void )
{
    SPCR = 0x50; 
    SPSR |= ( 1 << SPI2X );

    ms_delay ( 10 );
}

void spi_tx ( unsigned char data )
{
    SPDR = data;
    while ( ! (SPSR & ( 1 << SPIF ) ) );
}

unsigned char spi_rx ( void )
{
    SPDR = 0xff;
    while ( ! ( SPSR & ( 1 << SPIF ) ) );
    return SPDR;
}
//================================= SPI ROUTINES ===================================//
#endif

#ifdef SDSC
//================================= SDSC ROUTINES ==================================//
void sdsc_pin_assert ( void )
{
    PORTB &= ~0x02;
}

void sdsc_pin_deassert ( void )
{
    PORTB |= 0x02;
}
//================================= SDSC ROUTINES ==================================//
#endif

void ms_delay ( double delay )
{
    volatile int ms = delay;
    volatile int i;

    for ( ; ms; ms -- )
        for ( i = 0; i < 400; i ++ );
}

void us_delay ( double delay )
{
    volatile int us = delay;
    volatile int i;

    for ( ; us; us -- )
        for ( i = 0; i < 4; i ++ );
}

Answer 1

#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1);

有分号;导致问题。它改变了

UBRRH = ( BAUD_PRESCALE >> 8 );

到

UBRRH = ( (((F_CPU / (USART_BAUDRATE * 16UL))) - 1); >> 8 );

这看起来与第16行有关。

取出分号（你也可以删除两对括号）。

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

Answer 2

经过5天的研究，我终于找到了错误原因;）下面的行和uart_print函数参数需要在stdio.h头文件中撒谎的FILE宏，但在codevision小于3.05V或破解版本时它已从stdio.h中删除并导致错误;

 FILE uart_out= FDEV_SETUP_STREAM( uart_print, NULL, _FDEV_SETUP_WRITE );

我建议安装Atmel工作室......

使用c语言的codevision中的函数声明语法错误

2 个答案: