[求助] 【菜鸟求助】串口助手调试失败。求前辈指导

emdgbx 2014-12-23 10:23 楼主

我用官网的案例和串口调试助手试了试，我想在PC机向430发送一个数据，例如：ff，在单片机上把这个数据反映到IO口的LED灯上，理想状态是IO口的登全亮。但是失败了，IO口的灯只有两三个非常快的闪烁，亮度很低，不是一直亮的状态。不知道是这个程序不适应还是我串口助手用错了呢，求前辈指导一下
程序用的这个案例：
;-------------------------------------------------------------------------------
#include "msp430x16x.h"
;-------------------------------------------------------------------------------
         org    06000h
RESET
         mov    #00300h,SP
StopWDT    mov.w #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP3    bis.b #030h,&P3SEL          ; P3.4,5 = USART0 TXD/RXD
         mov.b #0h,&P1SEL
         mov.b #11111111b,&P1DIR
SetupUART0  bis.b #UTXE0+URXE0,&ME1    ; Enable USART0 TXD/RXD
         bis.b #CHAR,&UCTL0          ; 8-bit characters
         mov.b #SSEL0,&UTCTL0       ; UCLK = ACLK
         mov.b #003h,&UBR00          ; 32k/9600 - 3.41
         mov.b #000h,&UBR10          ;
         mov.b #04Ah,&UMCTL0          ; Modulation
         bic.b #SWRST,&UCTL0          ; **Initialize USART state machine**
         bis.b #URXIE0,&IE1          ; Enable USART0 RX interrupt
         mov.b #01010101b,&TXBUF0
                                          ;
Mainloop bis.b #LPM3+GIE,SR          ; Enter LPM3, interrupts enabled
         nop                            ; Required for debugger
                                          ;
;------------------------------------------------------------------------------
USART0RX_ISR;  Echo back RXed character, confirm TX buffer is ready first
;------------------------------------------------------------------------------
TX1       bit.b #UTXIFG0,&IFG1       ; USART0 TX buffer ready?
         jz    TX1                   ; Jump is TX buffer not ready
         mov.b &RXBUF0,&P1OUT       ; TX -> RXed character
         reti                         ;
                                          ;
;------------------------------------------------------------------------------
;          Interrupt Vectors
;------------------------------------------------------------------------------
         ORG    0FFFEh                ;
         DW    RESET                ; POR, ext. Reset, Watchdog
         ORG    0FFF6h                ;
         DW    USART0RX_ISR          ; USART0 receive
         END
-------------------------------------------------------------------