;;*****************************************************************************
;;*****************************************************************************
;;  FILENAME: CSR_1INT.asm
;;   Version: 1.1, Updated on 2005/10/13 at 09:13:22
;;  Generated by PSoC Designer ver 4.2  b1013 : 02 September, 2004
;;
;;  DESCRIPTION: CSR_1 User Module ISR implementation file for the
;;               21xxx PSoC family of devices.
;;-----------------------------------------------------------------------------
;;  Copyright (c) Cypress MicroSystems 2000-2005. All Rights Reserved.
;;*****************************************************************************
;;*****************************************************************************

include "m8c.inc"
include "memory.inc"
include "CSR_1.inc"


MSB:   equ  0
LSB:   equ  1
;-----------------------------------------------
;  Global Symbols
;-----------------------------------------------

export _CSR_1_SCAN_ISR

;-----------------------------------------------------------------------------
;  FUNCTION NAME: CSR_1_CAPTURE_ISR
;
;  DESCRIPTION:
;  Interrupt Service Routine for the 16 bit counter in the CSR.  If the interrupt 
;  is enabled and the comparator trips or the counter reaches terminal count (as
;  selected by user parameter) the code execution will vector to this ISR.  
;
;-----------------------------------------------------------------------------
;  
;
_CSR_1_SCAN_ISR:

   CSR_1_Stop_CMP_M                                    ; Disable power of comparator
   CSR_1_Stop_M                                        ; Stop PWM, then counter
   push   A
   push   X

   mov   A, [CSR_1_bSwitchNum]                         ; Get Counter Counter value
   asl   A
   mov   X,A

   mov   A, reg[CSR_1_CTR_COUNTER_LSB_REG]             ; Dummy Read
   mov   A, reg[CSR_1_CTR_COMPARE_LSB_REG]             ; Get Counter LSB
   mov   [X+(CSR_1_iaSwResult+LSB)],A

   mov   A, reg[CSR_1_CTR_COUNTER_MSB_REG]             ; Dummy Read
   mov   A, reg[CSR_1_CTR_COMPARE_MSB_REG]             ; Get Counter MSB
   mov   [X+(CSR_1_iaSwResult+MSB)],A

   ; Reset Counter period to 0xFFFF
   mov   reg[CSR_1_CTR_PERIOD_LSB_REG], 0xFF
   mov   reg[CSR_1_CTR_PERIOD_MSB_REG], 0xFF

   ; Subtract result from 0xFFFF
   mov   A,0xFF
   sub   A,[X+(CSR_1_iaSwResult+LSB)]
   mov   [X+(CSR_1_iaSwResult+LSB)],A
   mov   A,0xFF
   sbb   A,[X+(CSR_1_iaSwResult+MSB)]
   mov   [X+(CSR_1_iaSwResult+MSB)],A

   
   ; Disconnect the switch (place in reset state)
   mov   A,[CSR_1_bSwitchNum]
   lcall CSR_1_iGetPortPin                             ; Get switch port and mask
   lcall CSR_1_DisableSwitch                           ; Enable first switch


   ;  Determine if scanning should continue
   ; If still in scan mode select next switch to scan

   inc   [CSR_1_bSwitchNum]                            ; Advance to next switch
   mov   A, [CSR_1_bScanEnd]                           ; Check to see if it is out of range
   cmp   A,[CSR_1_bSwitchNum]                          ; Move new value to A
   jnc   .KeepScanning                                 ; Not end of scan list yet

   ; At end of scan list, determine if this is a one time scan or continuous

   or   [CSR_1_bfStatus],CSR_1_SCAN_SET_COMPLETE       ; Set Scan complete flag
   tst  [CSR_1_bfStatus],CSR_1_SCAN_CONTINUOUS         ; Continuous scan mode?
   jz   .STOP_SCANNING                                   ; Stop scanning
 
.TAKE_IT_FROM_TOP:
   mov   [CSR_1_bSwitchNum],[CSR_1_bScanStart]         ; Reset scan at top of list.

.KeepScanning:
   mov   A, [CSR_1_bPWMPeriod]
   mov   reg[CSR_1_PWM_PERIOD_REG], A                 ; Set PWM period

   CSR_1_Start_M                                       ; Start counter and scan pwm

   mov   A,[CSR_1_bSwitchNum]                          ; Enable the next switch
   lcall CSR_1_iGetPortPin                             ; Get switch port and mask
   lcall CSR_1_EnableSwitch                            ; Enable first switch

   jmp   .END_SCAN_ISR
   
.STOP_SCANNING:
   and  [CSR_1_bfStatus],~(CSR_1_SCAN_ACTIVE|CSR_1_SCAN_CONTINUOUS)   ; Clear scan active flag
   CSR_1_Stop_M                                        ; Disable counter and scan PWM
   CSR_1_Stop_CMP_M                                    ; Disable power of comparator
   CSR_1_DisableInt_M                                  ; Disable scan PWM interrupt

.END_SCAN_ISR:

   pop    X
   pop    A



.SCAN_RETURN:
   ;@PSoC_UserCode_BODY_TERMINAL@ (Do not change this line.)
   ;---------------------------------------------------
   ; Insert your custom code below this banner
   ;---------------------------------------------------
   ;   NOTE: interrupt service routines must preserve
   ;   the values of the A and X CPU registers.

   ;---------------------------------------------------
   ; Insert your custom code above this banner
   ;---------------------------------------------------
   ;@PSoC_UserCode_END@ (Do not change this line.)

   reti
; End of File CSR_1INT.asm