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File List  |  1992-04-28  |  4KB  |  133 lines
  1. Motorola DSP56000 Macro Cross Assembler  Version 2.03  89-08-04  15:58:57  loopevb.asm  Page 1
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  6. 2                        ;************************************************************
  7. 3                        ; file:loopevb.asm                                          *
  8. 4                        ;                                                           *
  9. 5                        ; Simple read ADC write DAC loop...                         *
  10. 6                        ; reads DSP56ADC16 data and writes to PCM-56                  *
  11. 7                        ;                                                           *
  12. 8                        ;************************************************************
  13. 9                        ; Written by Charlie Thompson 10/19/88 -- Rev 1.0 11/1/88
  14. 10     
  15. 11                                 opt     nomd,nocex,nocm,nomex
  16. 12     
  17. 13                                 page    132
  18. 14     
  19. 15                       ; Program start address
  20. 16     
  21. 17        P:0040                   org     p:$40
  22. 18     
  23. 19                       ; Set up ADS board in case of force break instead of force reset
  24. 20     
  25. 21        P:0040 08F4BE            movep             #0,x:$FFFE              ;set bcr to zero
  26.                  000000
  27. 22        P:0042 0500BB            movec             #0,sp                   ;init stack pointer
  28. 23        P:0043 0500B9            movec             #0,sr                   ;clear loop flag
  29. 24     
  30. 25                       ; Set up the SSI for operation with the DSP56ADC16EVB
  31. 26                       ; The following code sets port C to function as SCI/SSI
  32. 27     
  33. 28        P:0044 280000            move              #$0,a0                  ;zero PCC to cycle it
  34. 29        P:0045 08C821            movep             a0,x:$FFE1
  35. 30     
  36. 31        P:0046 50F400            move              #$0001ff,a0
  37.                  0001FF
  38. 32        P:0048 08C821            movep             a0,x:$FFE1              ;write PCC
  39. 33     
  40. 34                       ; The following code sets the SSI CRA and CRB control registers for external
  41. 35                       ; continuous clock, synchronous, normal mode.
  42. 36     
  43. 37        P:0049 50F400            move              #$004000,a0             ;CRA pattern for word length=16 bits
  44.                  004000
  45. 38        P:004B 08C82C            movep             a0,x:$FFEC
  46. 39     
  47. 40        P:004C 50F400            move              #$003200,a0             ;CRB pattern for continous ck,sych,normal mode
  48.                  003200
  49. 41        P:004E 08C82D            movep             a0,x:$FFED              ;word long frame sync: FSL=0;ext ck/fs 
  50. 42     
  51. 43     
  52. 44     
  53. 45                       ;************************************************************************
  54. 46                       ; Actual read A/D and write D/A -- insert application code as indicated *
  55. 47                       ;************************************************************************
  56. 48     
  57. 49                       ; The following code polls the RDF flag in the SSI-SR and waits for RDF=1
  58. 50                       ; and then reads the RX register to retrieve the data from the A/D converter.
  59. 51                       ; Sample rate is controlled by DSP56ADC16 board.   
  60. 52     
  61. 53     
  62. 54     
  63. 55     
  64. 56        P:004F 0AAE87  poll      jclr    #7,x:$FFEE,poll                   ;loop until RDF bit = 1
  65.                  00004F
  66. 57        P:0051 084E2F            movep             x:$FFEF,a               ;get A/D converter data
  67. Motorola DSP56000 Macro Cross Assembler  Version 2.03  89-08-04  15:58:57  loopevb.asm  Page 2
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  71. 58     
  72. 59     
  73. 60                       ; Write DSP56ADC16 A/D converter data to the PCM-56
  74. 61     
  75. 62        P:0052 567000            move              a,x:$FFEF               ;write the PCM-56 D/A via SSI xmt reg.
  76.                  00FFEF
  77. 63        P:0054 0C004F            jmp     poll                              ;loop indefinitely
  78. 64     
  79. 65                                 end
  80. 0    Errors
  81. 0    Warnings
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