paddle.c 1.4 KB

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  1. /*
  2. * Paddle manager - The peTI-NESulator Project
  3. * paddle.c
  4. *
  5. * Created by Manoël Trapier.
  6. * Copyright (c) 2002-2019 986-Studio.
  7. *
  8. */
  9. #include <stdio.h>
  10. #include <os_dependent.h>
  11. #include "paddle.h"
  12. void InitPaddle(Paddle *pdl)
  13. {
  14. pdl->bitPos = 1;
  15. pdl->strobeState = 0;
  16. }
  17. void WritePaddle(Paddle *pdl, uint8_t val)
  18. {
  19. pdl->strobeState = val & 1;
  20. pdl->bitPos = 1;
  21. }
  22. uint8_t ReadPaddle(Paddle *pdl)
  23. {
  24. uint8_t ret = 0x40;
  25. switch (pdl->bitPos)
  26. {
  27. case 1:
  28. if (getKeyStatus('O'))
  29. {
  30. ret = 0x41;
  31. }
  32. break;
  33. case 2:
  34. if (getKeyStatus('P'))
  35. {
  36. ret = 0x41;
  37. }
  38. break;
  39. case 3:
  40. if (getKeyStatus('I'))
  41. {
  42. ret = 0x41;
  43. }
  44. break;
  45. case 4:
  46. if (getKeyStatus('U'))
  47. {
  48. ret = 0x41;
  49. }
  50. break;
  51. case 5:
  52. if (getKeyStatus('W'))
  53. {
  54. ret = 0x41;
  55. }
  56. break;
  57. case 6:
  58. if (getKeyStatus('S'))
  59. {
  60. ret = 0x41;
  61. }
  62. break;
  63. case 7:
  64. if (getKeyStatus('A'))
  65. {
  66. ret = 0x41;
  67. }
  68. break;
  69. case 8:
  70. if (getKeyStatus('D'))
  71. {
  72. ret = 0x41;
  73. }
  74. break;
  75. default:
  76. ret = 0x41;
  77. }
  78. if ((pdl->strobeState == 0) && (pdl->bitPos <= 9))
  79. {
  80. pdl->bitPos++;
  81. }
  82. return ret;
  83. }