如何使用MPLABX和XC8进行asm BTFSC

在过去的几个小时里，我一直在思考这个问题，但是我的大脑却无法理解如何用BTFSC命令读取PIN。我在C中写所有的东西，但是需要一个非常快的函数，所以我想我写了一个小的ASM片段。代码将永远循环，只是复制引脚状态从一个引脚到另一个。就是这样。真的很容易。芯片：18F24k22这里我有：Pin_manager.h(只是重要部分)定义USB_TX_TRIS TRISC7\\\定义USB_TX_TX_TRIS_TRITRITRIS TRITRISC7\定义USB USB USB_TX_TRIX_TRIX_TRIX_Set.()定义USB_TX_TRISC7\\\\\\\\定义USB定义USB\\\#define USB_TX_Toggle()do{LATC7=~LATC7}同时(0)#定义USB_TX_XXXXXSetAnAnalog模式()PORTCbits.RC7#定义USB_TX_SetDiDigigigitalInInInput()定义USB_TX_XXXXXXXXXGetGetValValVal值()PORTCBRTCbits.USBCbits.USB_定义USB_XXXXXXX值()PORTCCXXXXXX值()PORTCCCBBBBBBBBXXX的USB.USB_XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX#定义USB_TX_SetDigital.()do{ANSC7=0；}虽然(0)#定义SX_RX_RX_RX_RX_TRIX_TRIS TRITRISSSX_RX_RX_TRITRITRITRITRITRISB6#定义SX_RX_RX_RX_TRISXTRISXTRIXTRITRISB6#定义SX_SX_RX_RX_RX_TRIXTRITRISB6#定义SX_RX_RX_RX_LATX_LATB6#定义SX_LAXSX_LAX_LATX_LATB6#SX_LATX_LATXLATB6#定义SX_LAX_LAX_LATB6#定义SX_LA(0)#define SX_RX_GetValue()PORTBbit3.RB6#定义SX_RX_SetDigitalInput()DO{TRISB6=1; }同时在(0)#定义SX_RX_RX_SetDiGiGiGiGiGiGi数字Output()做{TRISB SX_RX_RX_Set数字_Set数字数字数字数字数字输入()做{SX_SX_SX_RX_Set数字数字数字_SetDiGiGiGiGiGiGiGiGiGiGiGiGitaInInput()做{{TRISBSB6=1;}}}}_同时在(0){{TRISBSBSBSBSB6=TRISB6=TRISB6=1;}}1;{1; {1; }}应该读取USB_T的当前值然后设置另一个引脚)#asm USB_SX_MODE:btfsc PORTCbits.RC7//USB_TX-这是没有工作的部分，编译器将错误发送到USB_TX_HIGH bcf LATB，6，c//SX_RX-我假设这会工作。我还没有测试过。GOTO UBSXSXMODESUBXTXYHO: BSF LATB，6，C//SXYRX -我假设这会起作用。我还没有测试过。goto USB_SX_MODE#endasmmain.c:140:error：(844)lexical errormain.c:140:error：(876)syntax errorI是100%肯定的，其格式为btfsc行。但对于我的生活，我找不到在线正确的语法……任何指针都会被赏识的。然后我终于可以睡着了……



      以下为原文

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Been fighting this for the last couple hours and my brain just can't wrap around how to read a pin with the btfsc command.  I'm writing everything in c but need a very fast function so I figured I write a small asm snippet.  the code will loop forever and just copy the pin status from one pin to another..  That's it.  Really easy.  Chip: 18F24k22

Here what I have:
Pin_manager.h (just the important part)
#define USB_TX_TRIS               TRISC7
#define USB_TX_LAT                LATC7
#define USB_TX_PORT               PORTCbits.RC7
#define USB_TX_ANS                ANSC7
#define USB_TX_SetHigh()    do { LATC7 = 1; } while(0)
#define USB_TX_SetLow()   do { LATC7 = 0; } while(0)
#define USB_TX_Toggle()   do { LATC7 = ~LATC7; } while(0)
#define USB_TX_GetValue()         PORTCbits.RC7
#define USB_TX_SetDigitalInput()    do { TRISC7 = 1; } while(0)
#define USB_TX_SetDigitalOutput()   do { TRISC7 = 0; } while(0)

#define USB_TX_SetAnalogMode()   do { ANSC7 = 1; } while(0)
#define USB_TX_SetDigitalMode()   do { ANSC7 = 0; } while(0)

#define SX_RX_TRIS               TRISB6
#define SX_RX_LAT                LATB6
#define SX_RX_PORT               PORTBbits.RB6
#define SX_RX_WPU                WPUB6
#define SX_RX_SetHigh()    do { LATB6 = 1; } while(0)
#define SX_RX_SetLow()   do { LATB6 = 0; } while(0)
#define SX_RX_Toggle()   do { LATB6 = ~LATB6; } while(0)
#define SX_RX_GetValue()         PORTBbits.RB6
#define SX_RX_SetDigitalInput()    do { TRISB6 = 1; } while(0)
#define SX_RX_SetDigitalOutput()   do { TRISB6 = 0; } while(0)

#define SX_RX_SetPullup()    do { WPUB6 = 1; } while(0)
#define SX_RX_ResetPullup()   do { WPUB6 = 0; } while(0)



main.c (just a small part that should read the current value of USB_TX and set another pin)
#asm
            
USB_SX_MODE:
    btfsc   PORTCbits.RC7       //USB_TX  -  This is the part not working, compiler throws error
    goto   USB_TX_HIGH
    bcf     LATB, 6, c       //SX_RX - I'm assuming this will work.  I haven't tested yet.
    goto    USB_SX_MODE
USB_TX_HIGH:
    bsf     LATB, 6, c       //SX_RX    - I'm assuming this will work.  I haven't tested yet.
    goto   USB_SX_MODE

#endasm



main.c:140: error: (844) lexical error
main.c:140: error: (876) syntax error


I'm 100% positive its the format of the btfsc line.  but for the life of me, I can't find online the right syntax...

Any pointers would be appreciated.  Then I can finally go to sleep...

Thanks
Damon