NIOS II錯誤：整數常量上的無效後綴

因此，我一直在DE2-155板上製作SD卡音樂播放器一段時間。我終於完成了這個硬件，並且已經在C編碼中完成了它。但是，在我可以構建項目之前，我一直收到錯誤：「整數常量上的後綴無效」0b00100000「。」NIOS II錯誤：整數常量上的無效後綴

這是我的C代碼：

#include <io.h> 
#include <system.h> 

#include "altera_up_avalon_audio_and_video_config.h" 
#include "altera_up_avalon_audio.h" 

#define SD_CARD_OFFSET_RXTX 0 
#define SD_CARD_OFFSET_CMD 560 
#define SD_CARD_OFFSET_CMD_ARG 556 
#define SD_CARD_OFFSET_ASR 564 

#define SD_CONNECTED  0x02 
#define SD_COMPLETE  0x04 
#define SD_BLOCK_SIZE  512 
#define SD_CMD_READ  0x11 

int main() 
{ 
    int *sd_asr = (int *)(ALTERA_UP_SD_CARD_AVALON_INTERFACE_0_BASE + SD_CARD_OFFSET_ASR); 
    short int sd_status; 
    int res; 
    int sector_count, byte_count; 
    unsigned int l_buff,r_buff; 

alt_up_av_config_dev* cfg_dev; 
alt_up_audio_dev* audio_dev; 

/* Wait for SD-Card */ 

printf("Wait for SD-Card to be connected...\n"); 

do{ 
    sd_status=(short int)IORD_16DIRECT(sd_asr,0); 
}while((sd_status & SD_CONNECTED) == 0); 

printf("SD-Card connected.\n"); 

/* Initialize CFG/Audio Device */ 

cfg_dev=alt_up_av_config_open_dev("/dev/audio_and_video_config_0"); 

if(cfg_dev == NULL){ 
    printf("Config device not found.\n"); 
}else{ 
    printf("Config device opened for configuration.\n"); 
} 

printf("Resetting config device and peripherals...\n"); 

res = alt_up_av_config_reset(cfg_dev); 

alt_up_av_config_write_audio_cfg_register(cfg_dev,0x08,0b00100000); 

if(res == 0){ 
    printf("Reset successful.\n"); 
}else{ 
    printf("Reset failed.\n"); 
} 

/* Play Music */ 

audio_dev = alt_up_audio_open_dev("/dev/audio_0"); 

if(audio_dev == NULL){ 
    printf("Failed to open audio device.\n"); 
}else{ 
    printf("Audio device opened.\n"); 
} 

printf("Starting playback!\n"); 

sector_count=0; 
while(1) 
{ 
    /* Read 512B sector from SD-Card */ 
    IOWR_32DIRECT(ALTERA_UP_SD_CARD_AVALON_INTERFACE_0_BASE,SD_CARD_OFFSET_CMD_ARG,sector_count*512); 
    IOWR_16DIRECT(ALTERA_UP_SD_CARD_AVALON_INTERFACE_0_BASE,SD_CARD_OFFSET_CMD,SD_CMD_READ); 
    do{ 
     sd_status=(short int)IORD_16DIRECT(ALTERA_UP_SD_CARD_AVALON_INTERFACE_0_BASE,SD_CARD_OFFSET_ASR); 
    }while((sd_status & SD_COMPLETE) != 0); 

    byte_count=0; 
    while(byte_count < 512){ 
     l_buff = (unsigned int)IORD_16DIRECT(ALTERA_UP_SD_CARD_AVALON_INTERFACE_0_BASE,SD_CARD_OFFSET_RXTX+byte_count); 
     r_buff = (unsigned int)IORD_16DIRECT(ALTERA_UP_SD_CARD_AVALON_INTERFACE_0_BASE,SD_CARD_OFFSET_RXTX+(byte_count+2)); 
     byte_count+=4; 
     while(alt_up_audio_write_fifo_space(audio_dev,ALT_UP_AUDIO_RIGHT) < 4){ asm("NOP"); } 
      alt_up_audio_write_fifo (audio_dev, &(r_buff), 1, ALT_UP_AUDIO_RIGHT); 
      alt_up_audio_write_fifo (audio_dev, &(l_buff), 1, ALT_UP_AUDIO_LEFT); 
     } 

     sector_count++; 
    } 

    return 0; 
}

來源

2014-12-05 mightynifty

該錯誤是在線路

alt_up_av_config_write_audio_cfg_register(cfg_dev,0x08,0b00100000);

0b00100000是一個整數值。如果整數值以開頭，則下一個字符必須是x以將整數數字聲明爲十六進制數字，否則它將被解釋爲octal number。八進制數只能有數字0〜7

0b00100000是二進制這是十進制或十六進制0x20的。

也Can I use a binary literal in C or C++?

看到像0b00100000二進制表示法只有GCC啓用GCC擴展支持。

來源

2014-12-05 17:52:22 Mofi

我用32替換了它，錯誤消失了。我認爲可能是這樣，但有人告訴我，二進制文件爲他們工作，所以我想我會問。謝謝您的幫助！ – mightynifty 2014-12-05 18:05:15

NIOS II錯誤：整數常量上的無效後綴

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