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c语言 - ATmega328p - "易失性"之前的预期非限定 id



我正在为我的ATmega328p开发一个用于OTA更新的自定义引导加载程序。我从Arduino的Optiboot引导加载程序代码中获得了帮助，对于USART部分，我已经编写了一个用于处理USART命令部分的自定义头文件。这是代码(检查代码基本上是为了测试逻辑(-

bootuart.h

#ifndef _BOOT_UART_H
#define _BOOT_UART_H
#include <avr/io.h>
#if (SOFT_UART == 0)
#if (UART == 0)
#if defined(UDR0)
#define UART_SRA UCSR0A
#define UART_SRB UCSR0B
#define UART_SRC UCSR0C
#define UART_SRL UBRR0L
#define UART_UDR UDR0
#elif defined(UDR)
#define UART_SRA UCSRA
#define UART_SRB UCSRB
#define UART_SRC UCSRC
#define UART_SRL UBRRL
#define UART_UDR UDR
#elif defined(LINDAT)
#error UART == 0, but no LINDAT support in prog
#else
#error UART == 0, but no UART0 on device
#endif
#elif (UART == 1)
#if !defined(UDR1)
#error UART == 1, but no UART1 on device
#endif
#define UART_SRA UCSR1A
#define UART_SRB UCSR1B
#define UART_SRC UCSR1C
#define UART_SRL UBRR1L
#define UART_UDR UDR1
#elif (UART == 2)
#if !defined(UDR2)
#error UART == 2, but no UART2 on device
#endif
#define UART_SRA UCSR2A
#define UART_SRB UCSR2B
#define UART_SRC UCSR2C
#define UART_SRL UBRR2L
#define UART_UDR UDR2
#elif (UART == 3)
#if !defined(UDR3)
#error UART == 3, but no UART3 on device
#endif
#define UART_SRA UCSR3A
#define UART_SRB UCSR3B
#define UART_SRC UCSR3C
#define UART_SRL UBRR3L
#define UART_UDR UDR3
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
void writeUSART(uint8_t);
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
extern "C" {
#endif
uint8_t readUSART(void);
#ifdef __cplusplus
}
#endif
#endif

bootuart.c

#include <avr/io.h>
#include "bootuart.h"
void writeUSART(uint8_t ch) {
#if (SOFTUART == 0)
#ifndef LINUART
while (!(UART_SRA & _BV(UDRE0)));
#endif
UART_UDR = ch;
#endif
}
uint8_t readUSART(void) {
uint8_t ch;
#if (SOFTUART == 0)
#ifndef LINUART
while(!(UART_SRA & _BV(RXC0)));
#endif
ch = UART_UDR;
#endif
return ch;
}

检查.ino

#if !defined(SOFTUART)
#define SOFTUART 0
#endif
#if !defined(UART)
#define UART 0
#endif
#if !defined(SINGLESPEED)
#define SINGLESPEED 0
#endif
#include <avr/io.h>
#include "bootuart.h"
#ifndef BAUD_RATE
#if F_CPU >= 8000000L
#define BAUD_RATE   115200L     // Highest rate Avrdude win32 can support
#elif F_CPU >= 1000000L
#define BAUD_RATE   9600L       // 19200 also supported, but with significant error
#elif F_CPU >= 128000L
#define BAUD_RATE   4800L       // Good for 128kHz internal RC
#else
#define BAUD_RATE 1200L         // Good even at 32768Hz
#endif
#endif
#if (SOFTUART == 0)
#if SINGLESPEED
/* Single speed option */
#define BAUD_SETTING (( (F_CPU + BAUD_RATE * 8L) / ((BAUD_RATE * 16L))) - 1 )
#define BAUD_ACTUAL (F_CPU/(16 * ((BAUD_SETTING)+1)))
#else
/* Normal U2X usage */
#define BAUD_SETTING (( (F_CPU + BAUD_RATE * 4L) / ((BAUD_RATE * 8L))) - 1 )
#define BAUD_ACTUAL (F_CPU/(8 * ((BAUD_SETTING)+1)))
#endif
#if BAUD_ACTUAL <= BAUD_RATE
#define BAUD_ERROR (( 100*(BAUD_RATE - BAUD_ACTUAL) ) / BAUD_RATE)
#if BAUD_ERROR >= 5
#error BAUD_RATE off by greater than -5%
#elif BAUD_ERROR >= 2  && !defined(PRODUCTION)
#warning BAUD_RATE off by greater than -2%
#endif
#else
#define BAUD_ERROR (( 100*(BAUD_ACTUAL - BAUD_RATE) ) / BAUD_RATE)
#if BAUD_ERROR >= 5
#error BAUD_RATE off by greater than 5%
#elif BAUD_ERROR >= 2  && !defined(PRODUCTION)
#warning BAUD_RATE off by greater than 2%
#endif
#endif
#if BAUD_SETTING > 250
#error Unachievable baud rate (too slow) BAUD_RATE 
#endif // baud rate slow check
#if (BAUD_SETTING - 1) < 3
#if BAUD_ERROR != 0 // permit high bitrates (ie 1Mbps@16MHz) if error is zero
#error Unachievable baud rate (too fast) BAUD_RATE 
#endif
#endif // baud rate fast check
#endif // SOFTUART
#if (SOFTUART == 0)
#if defined(__AVR_ATmega8__) || defined (__AVR_ATmega8515__) || 
defined (__AVR_ATmega8535__) || defined (__AVR_ATmega16__) ||   
defined (__AVR_ATmega32__)
#if (SINGLESPEED == 0)
UCSRA = _BV(U2X); //Double speed mode USART
#endif //singlespeed
UCSRB = _BV(RXEN) | _BV(TXEN);  // enable Rx & Tx
UCSRC = _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);  // config USART; 8N1
UBRRL = (uint8_t)BAUD_SETTING;
#else // mega8/etc
#ifdef LINUART
//DDRB|=3;
LINCR = (1 << LSWRES); 
//LINBRRL = (((F_CPU * 10L / 32L / BAUD_RATE) + 5L) / 10L) - 1; 
LINBRRL=(uint8_t)BAUD_SETTING;
LINBTR = (1 << LDISR) | (8 << LBT0); 
LINCR = _BV(LENA) | _BV(LCMD2) | _BV(LCMD1) | _BV(LCMD0); 
LINDAT=0;
#else
#if (SINGLESPEED == 0)
UART_SRA = _BV(U2X0); //Double speed mode USART0
#endif
UART_SRB = _BV(RXEN0) | _BV(TXEN0);
UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
UART_SRL = (uint8_t)BAUD_SETTING;
#endif // LINUART
#endif // mega8/etc
#endif // softUART
int main(void)
{ 
while(1){
writeUSART(readUSART());
}
return 0;
}

问题：现在，问题是每当我编译代码时，我都会得到如下错误：-

bootuart.h:8:24: error: expected unqualified-id before 'volatile'
#define UART_SRA UCSR0A
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:82:5: note: in expansion of macro 'UART_SRA'
UART_SRA = _BV(U2X0); //Double speed mode USART0
^~~~~~~~
bootuart.h:8:24: error: expected ')' before 'volatile'
#define UART_SRA UCSR0A
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:82:5: note: in expansion of macro 'UART_SRA'
UART_SRA = _BV(U2X0); //Double speed mode USART0
^~~~~~~~
bootuart.h:8:24: error: expected ')' before 'volatile'
#define UART_SRA UCSR0A
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:82:5: note: in expansion of macro 'UART_SRA'
UART_SRA = _BV(U2X0); //Double speed mode USART0
^~~~~~~~
bootuart.h:9:24: error: expected unqualified-id before 'volatile'
#define UART_SRB UCSR0B
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:84:4: note: in expansion of macro 'UART_SRB'
UART_SRB = _BV(RXEN0) | _BV(TXEN0);
^~~~~~~~
bootuart.h:9:24: error: expected ')' before 'volatile'
#define UART_SRB UCSR0B
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:84:4: note: in expansion of macro 'UART_SRB'
UART_SRB = _BV(RXEN0) | _BV(TXEN0);
^~~~~~~~
bootuart.h:9:24: error: expected ')' before 'volatile'
#define UART_SRB UCSR0B
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:84:4: note: in expansion of macro 'UART_SRB'
UART_SRB = _BV(RXEN0) | _BV(TXEN0);
^~~~~~~~
bootuart.h:10:24: error: expected unqualified-id before 'volatile'
#define UART_SRC UCSR0C
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:85:4: note: in expansion of macro 'UART_SRC'
UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
^~~~~~~~
bootuart.h:10:24: error: expected ')' before 'volatile'
#define UART_SRC UCSR0C
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:85:4: note: in expansion of macro 'UART_SRC'
UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
^~~~~~~~
bootuart.h:10:24: error: expected ')' before 'volatile'
#define UART_SRC UCSR0C
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:85:4: note: in expansion of macro 'UART_SRC'
UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
^~~~~~~~
bootuart.h:11:24: error: expected unqualified-id before 'volatile'
#define UART_SRL UBRR0L
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:86:4: note: in expansion of macro 'UART_SRL'
UART_SRL = (uint8_t)BAUD_SETTING;
^~~~~~~~
bootuart.h:11:24: error: expected ')' before 'volatile'
#define UART_SRL UBRR0L
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:86:4: note: in expansion of macro 'UART_SRL'
UART_SRL = (uint8_t)BAUD_SETTING;
^~~~~~~~
bootuart.h:11:24: error: expected ')' before 'volatile'
#define UART_SRL UBRR0L
^
E:SPIDEROTA_Programming_ModuleMisccheckcheck.ino:86:4: note: in expansion of macro 'UART_SRL'
UART_SRL = (uint8_t)BAUD_SETTING;
^~~~~~~~
exit status 1
expected unqualified-id before 'volatile'

我已经查看了许多关于这个问题的其他链接，但都没有帮助。对于StackOverflow-question中的1个问题，根据答案，我已经检查了我的#define与代码中包含的libs文件中的任何其他标识符都不匹配。但问题依然存在。

p.S：我甚至尝试过将#define标识符名称更改为其他标识符名称，但都是徒劳的。此外，我已经尝试了ATMEL工作室的代码。没有任何好处。

有人能指出，我的代码出了什么问题吗？因为如果它在Optiboot中工作，那么它也应该在这里工作，这就是我的感觉

任何帮助都将不胜感激。提前谢谢。

在进行一些替换(并非全部替换(后，您将得到以下内容：

#if !defined(SOFTUART)
#define SOFTUART 0
#endif
#if !defined(UART)
#define UART 0
#endif
#if !defined(SINGLESPEED)
#define SINGLESPEED 0
#endif
#include <avr/io.h>
#include "bootuart.h"

UART_SRA = _BV(U2X0); //Double speed mode USART0
UART_SRB = _BV(RXEN0) | _BV(TXEN0);
UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
UART_SRL = (uint8_t)BAUD_SETTING;
int main(void)
{ 
while(1){
writeUSART(readUSART());
}
return 0;
}

正如你可能知道的，你不能做任何函数之外的事情。你必须把它放在主块中，或者让它设置主函数中调用的函数：

void setup() {
#if (SOFTUART == 0)
#if defined(__AVR_ATmega8__) || defined (__AVR_ATmega8515__) || 
defined (__AVR_ATmega8535__) || defined (__AVR_ATmega16__) ||   
defined (__AVR_ATmega32__)
#if (SINGLESPEED == 0)
UCSRA = _BV(U2X); //Double speed mode USART
#endif //singlespeed
UCSRB = _BV(RXEN) | _BV(TXEN);  // enable Rx & Tx
UCSRC = _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);  // config USART; 8N1
UBRRL = (uint8_t)BAUD_SETTING;
#else // mega8/etc
#ifdef LINUART
//DDRB|=3;
LINCR = (1 << LSWRES); 
//LINBRRL = (((F_CPU * 10L / 32L / BAUD_RATE) + 5L) / 10L) - 1; 
LINBRRL=(uint8_t)BAUD_SETTING;
LINBTR = (1 << LDISR) | (8 << LBT0); 
LINCR = _BV(LENA) | _BV(LCMD2) | _BV(LCMD1) | _BV(LCMD0); 
LINDAT=0;
#else
#if (SINGLESPEED == 0)
UART_SRA = _BV(U2X0); //Double speed mode USART0
#endif
UART_SRB = _BV(RXEN0) | _BV(TXEN0);
UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
UART_SRL = (uint8_t)BAUD_SETTING;
#endif // LINUART
#endif // mega8/etc
#endif // softUART
} // setup()
int main() {
setup();
while (1) {

} // while
} // main()

顺便说一句：optiboot有一点不同——它在主要功能的内部

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