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我目前正在编写一些基本的 ARM 汇编程序。这个想法是在连接了应用板的 LPC2378 开发板上控制理论熔炉及其冷却/加热系统。

就识别来自设备的输入而言,我已经到了那里。但是,我无法正确设置循环,我希望你们能够指出为什么我的循环卡住了,即使在按下按钮 1 后,风扇也没有打开。我以前让风扇工作,但是当我开始尝试通过加热器的温度来控制风扇时,它似乎永远不会启动,并且加热器保持打开状态,在没有风扇冷却的情况下变得越来越热。

我猜这可能归结为我从 ADC 控制器读取温度的方式。

请不要犹豫,询问您是否需要更多信息来回答问题。

;=========================================================================
; MotorControl_1
;
; BUT1 turns motor ON and BUT2 turns motor OFF
;
; No interrupt support (except for Reset) - as simple as it gets!
;
; WDH, November 2008
;==========================================================================

; Set-up interrupt vectors and stack support
$ LPC2378InterruptVectors.s

; After a reset exception, execution starts here - the processor is in ARM
; mode and supervisor state with interrupts disabled

    SECTION .text:CODE:NOROOT(2)

    REQUIRE __vector  ; Forces reference to this symbol - required by linker

    ARM

; __iar_program_start - defined start symbol.
__iar_program_start:

; Include lpc2378 IO register definitions
#include "iolpc2378.h"

; Include Olimex LPC-2378-STK IO definitions
#include "OlimexLPC2378BoardDefs.h"

; Main entry point - required by debugger

;=========================================================================
; main starts here
;=========================================================================
main

;=========================================================================
; Stack setup
;
; Stack pointer (r13 or SP) is assigned the highest address in a 32kB
; section of on-chip SRAM - assumes a FULL descending stack convention
;=========================================================================

    ldr r13, = 0x40008000
    ldr r2, = 0x000050    ;Load the delay value
    ldr r3, = 0x028       ;Start set point at 40
    ldr r4, = 0x000       ;Start temp difference as 0
;        ldr r6, = 0x0f        ;Temp High Value (15)
;        ldr r7, = -0xF        ;Set r7 to -15.   

; Initialise IO
  BL InitialiseARM_IO
  BL InitialiseApplicationsBoard_IO

; Initialise the devices and display
  BL FanOff
  BL errorLedOff
  BL systemLedOff
  BL heaterOff


LoopStart

  BL WaitBUT1
  BL heaterOn
  BL systemLedOn
  BL readTemp
  BL checkTemp
  CMP r0, #5
  BGT errorVal
  SUBS r7, r6, r4 ;Performs r7 = r6 - r4 and sets condition register
  BLT LoopStart ;Branches to label_bar if r7 < 0 (in which case r6 < r4)
  BGT heaterOff
  BGT errorLedOn
  BGT FanOn
  BGT LoopStart
  BL WaitBUT2
  BL FanOff
  BL errorLedOff
  BL systemLedOff
  BL heaterOff

        B LoopStart


  ;=========================================================================
  ; InitialiseARM_IO
  ;
  ; Initialise the ARM interface, as follows:
  ;
  ; Port0(13..14} GPIO Output to on-board LEDs
  ;    bit 13:      USB_LINK LED
  ;    bit 14:      USB_CONNECT LED
  ; Port0{18,29} GPIO Input from BUT1 and BUT2
  ;    bit 18:      BUT2 pressbutton input
  ;    bit 29:      BUT1 pressbutton input
  ; Port1{18,19} GPIO Inputs from joystick UP and DOWN
  ;    bit 18:      UP joystick inout
  ;    bit 19:      DOWN joystick input
  ;=========================================================================
  InitialiseARM_IO

  ; Define data direction for LEDs - the LEDs are connected
  ; to P0.13 and P0.14

  STMFD r13!,{r0,r5,r14}   ; Push r0, r5 and LR

  ;LEDs on ARM board:
  ; Assign GPIO on P0.13 and P0.14
  LDR R5, =PINSEL0         ; Address of PINSEL0
  LDR R0, [R5]             ; Read current PINSEL0
  BIC R0, R0, #0x3C000000  ; Clear bits 26..29
  STR R0, [R5]             ; Put back in PINSEL0

  ; Configure output for P0.13 and P0.14
  LDR R5, =IO0DIR          ; Address of IO0DIR
  LDR R0, [R5]             ; Read current IO0DIR
  ORR R0, R0, #0x6000      ; Set bits 13 and 14 - for P0.13 and P0.14
  STR R0, [R5]             ; Put back in IO0DIR

  ; Switches and Joystick inputs on ARM board
  ; Assign GPIO on P0.18 and P0.29
  LDR R5, =PINSEL1         ; Address of PINSEL1
  LDR R0, [R5]             ; Read current PINSEL1
  BIC R0, R0, #0x30        ; Clear bits 4..5
  BIC R0, R0, #0x0c000000  ; Clear bits 26..27
  STR R0, [R5]             ; Put back in PINSEL0

  ; Configure input for P0.18 and P0.29
  LDR R5, =IO0DIR          ; Address of IO0DIR
  LDR R0, [R5]             ; Read current IO0DIR
  BIC R0, R0, #0x20000000  ; Clear bits 18 and 29 - for P0.18 and P0.29
  BIC R0, R0, #0x00040000
  STR R0, [R5]             ; Put back in IO0DIR

  ; Assign GPIO on P1.18 and P1.19
  LDR R5, =PINSEL3         ; Address of PINSEL3
  LDR R0, [R5]             ; Read current PINSEL3
  BIC R0, R0, #0xF0        ; Clear bits 4..7
  STR R0, [R5]             ; Put back in PINSEL3

  ; Configure input for P1.18 and P1.19
  LDR R5, =IO1DIR          ; Address of IO1DIR
  LDR R0, [R5]             ; Read current IO1DIR
  BIC R0, R0, #0xc0000     ; Clear bits 18 and 19 - for P1.18 and P1.19
  STR R0, [R5]             ; Put back in IO1DIR

  LDMFD r13!,{r0,r5,r14}   ; Pop r0, r5 and LR
  mov pc, r14              ; Put link register back into PC



  ;=========================================================================
  ; InitialiseApplicationsBoard_IO
  ;
  ; Initialise the interface to the Applications Board, as follows:
  ;
  ; Port4{0..7} GPIO Output to LEDs, Motor and Heater
  ;    bits 0..4:   Temperature error LED indicators
  ;    bit 5:       Heater control
  ;    bits 6..7:   Motor control
  ; Port4(8..15} GPIO Input from ADC
  ;    bits 8..15:  Inputs from Application Board ADC
  ;
  ;=========================================================================
  InitialiseApplicationsBoard_IO

  ; Define data direction for LEDs - the LEDs are connected
  ; to P0.13 and P0.14

  STMFD r13!,{r0,r5,r14}   ; Push r0, r5 and LR

  ; Applications Board Interface via Port4
  ; Set FIO4MASK to allow access to all bits
  LDR R5, =FIO4MASK        ; Address of FIO4DIR
  LDR R0, [R5]             ; Read current IO4DIR
  MOV R0, #0x0             ; Clear all bits of FIO4MASK
  STR R0, [R5]             ; Put back in IO4DIR

  ; Configure output for P4.0 to P4.7
  LDR R5, =FIO4DIR         ; Address of FIO4DIR
  LDR R0, [R5]             ; Read current IO4DIR
  ORR R0, R0, #0xFF        ; Set bits 0..7 - for P4.0 and P4.7
  STR R0, [R5]             ; Put back in IO4DIR

  ; Configure input for P4.8 to P4.15
  LDR R5, =FIO4DIR         ; Address of FIO4DIR
  LDR R0, [R5]             ; Read current IO4DIR
  BIC R0, R0, #0xFF00      ; Clear bits 8..15 - for P4.8 and P4.15
  STR R0, [R5]             ; Put back in IO4DIR

  LDMFD r13!,{r0,r5,r14}   ; Pop r0, r5 and LR
  mov pc, r14              ; Put link register back into PC




  ;=========================================================================
  ; Wait for BUT1 to be pressed
  ;=========================================================================
  WaitBUT1
  STMFD r13!,{r0,r5,r14}   ; Push r0, r5 and LR

  WaitForBUT1Pressed
    ldr r0, = IO0PIN            ; Address of FIO0PIN register 
    ldr r1, [r0]                ; Read FIO0PIN in to r1
    ands r1, r1, # B1_MASK      ; Mask out BUT1
    beq BUT1Pressed             ; Exit LED toggle loop if button is pressed
    B WaitForBUT1Pressed
  BUT1Pressed

  LDMFD r13!,{r0,r5,r14}   ; Pop r0, r5 and LR
  mov pc, r14              ; Put link register back into PC


  ;=========================================================================
  ; Wait for BUT2 to be pressed
  ;=========================================================================
  WaitBUT2
  STMFD r13!,{r0,r5,r14}   ; Push r0, r5 and LR

  WaitForBUT2Pressed
    ldr r0, = IO0PIN            ; Address of FIO0PIN register 
    ldr r1, [r0]                ; Read FIO0PIN in to r1
    ands r1, r1, # B2_MASK      ; Mask out BUT1
    beq BUT2Pressed             ; Exit LED toggle loop if button is pressed
    B WaitForBUT2Pressed
  BUT2Pressed

  LDMFD r13!,{r0,r5,r14}   ; Pop r0, r5 and LR
  mov pc, r14              ; Put link register back into PC


  ;=========================================================================
  ; Turn Fan Motor ON
  ;=========================================================================
  FanOn
  STMFD r13!,{r0,r5,r14}      ; Push r0, r5 and LR
  LDR R5, =FIO4PIN            ; Address of FIO4PIN
  LDR r0, [r5]                ; Read current Port4
  ORR r0, r0, #0x80
  STR r0, [r5]                ; Output
  LDMFD r13!,{r0,r5,r14}      ; Pop r0, r5 and LR
  mov pc, r14                 ; Put link register back into PC

  ;=========================================================================
  ; Turn Fan Motor OFF
  ;=========================================================================
  FanOff
  STMFD r13!,{r0,r5,r14}      ; Push r0, r5 and LR
  LDR R5, =FIO4PIN            ; Address of FIO4PIN
  LDR r0, [r5]                ; Read current Port4
  BIC r0, r0, #0xc0
  STR r0, [r5]                ; Output
  LDMFD r13!,{r0,r5,r14}      ; Pop r0, r5 and LR
  mov pc, r14                 ; Put link register back into PC
  ;==============================================================================
  ; Turn On Error LED
  ;==============================================================================
  errorLedOn
  STMFD r13!,{r0, r5,r14}
  mov r0, # USB_LINK_LED_MASK
  ldr r5, = IO0CLR
  str r0, [r5]
  LDMFD r13!,{r0, r5, r14}
  mov pc, r14
  ;==============================================================================
  ; Turn Off Error LED
  ;==============================================================================
  errorLedOff
  STMFD r13!,{r0, r5,r14}
  mov r0, # USB_LINK_LED_MASK
  ldr r5, = IO0SET
  str r0, [r5]
  LDMFD r13!,{r0, r5, r14}
  mov pc, r14
  ;==============================================================================
  ; Turn On System LED   
  ;==============================================================================    
  systemLedOn
  STMFD r13!,{r0, r5,r14}
  mov r0, # USB_CONNECT_LED_MASK
  ldr r5, = IO0CLR
  str r0, [r5]
  LDMFD r13!,{r0, r5, r14}
  mov pc, r14
  ;==============================================================================
  ; Turn Off System LED
  ;==============================================================================
  systemLedOff
  STMFD r13!,{r0, r5,r14}
  mov r0, # USB_CONNECT_LED_MASK
  ldr r5, = IO0SET
  str r0, [r5]
  LDMFD r13!,{r0, r5, r14}
  mov pc, r14 
  ;==============================================================================
  ; Turn Heater On
  ;==============================================================================
  heaterOn
  STMFD r13!,{r0,r5,r14}      ; Push r0, r5 and LR
  LDR R5, =FIO4PIN            ; Address of FIO4PIN
  LDR r0, [r5]                ; Read current Port4
  ORR r0, r0, #0x20
  STR r0, [r5]                ; Output
  LDMFD r13!,{r0,r5,r14}      ; Pop r0, r5 and LR
  mov pc, r14                 ; Put link register back into PC     
  ;==============================================================================
  ; Turn The Heater Off
  ;==============================================================================
  heaterOff
  STMFD r13!,{r0,r5,r14}      ; Push r0, r5 and LR
  LDR R5, =FIO4PIN            ; Address of FIO4PIN
  LDR r0, [r5]                ; Read current Port4
  AND r0, r0, #0xDF
  STR r0, [r5]                ; Output
  LDMFD r13!,{r0,r5,r14}      ; Pop r0, r5 and LR
  mov pc, r14                 ; Put link register back into PC   
  ;==============================================================================
  ; Read Temperature
  ;============================================================================== 
  readTemp
  STMFD r13!,{r0,r5,r14}      ; Push r0, r5 and LR
  LDR r0, =FIO4PIN
  LDR r1, [r0]
  LSR r1, r1, #8
  AND r1, r1, #0xFF ; r1 now holds the temperature value
  LDMFD r13!,{r0,r5,r14}      ; Pop r0, r5 and LR
  mov pc, r14                 ; Put link register back into PC
  ;==============================================================================
  ; Implement Counter And Read Temperature
  ;==============================================================================
  checkTemp
  STMFD r13!,{r0, r14}     ; Push PC, r0, Lr
  LSR r1, r1, #8
  LDR r0, [r2]               ; Load delay value in r0.
  SUB r0, r0, #0x01         ; Minus 1 from delay.
  BEQ readTemp             ; Branch if timer counted down.

  errorVal
  STMFD r13!,{r0, r14}     ; Push PC, r0, Lr
  SUB r1, r3, r6           ; Subtract set point from temperature, into r6
  mov pc, r14                 ; Put link register back into PC


            END
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1 回答 1

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看起来您已经将 BGT(如果大于则分支)与 BLGT(如果大于则分支和链接)混淆了。在你的主循环中间,你有这个:

  BLT LoopStart ;Branches to label_bar if r7 < 0 (in which case r6 < r4)
  BGT heaterOff
  BGT errorLedOn
  BGT FanOn
  BGT LoopStart

如果条件为“大于”,您的代码将分支到heatOff,然后当该函数返回时,它将完全退出代码。函数errorLedOnFanOn永远无法执行。

于 2012-05-18T19:15:17.327 回答