system.c 2.0 KB

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  1. /*
  2. * =====================================================================================
  3. *
  4. * ________ .__ __ ________ ____ ________
  5. * \_____ \ __ __|__| ____ | | __\______ \ _______ _/_ |/ _____/
  6. * / / \ \| | \ |/ ___\| |/ / | | \_/ __ \ \/ /| / __ \
  7. * / \_/. \ | / \ \___| < | ` \ ___/\ / | \ |__\ \
  8. * \_____\ \_/____/|__|\___ >__|_ \/_______ /\___ >\_/ |___|\_____ /
  9. * \__> \/ \/ \/ \/ \/
  10. *
  11. * www.optixx.org
  12. *
  13. *
  14. * Version: 1.0
  15. * Created: 07/21/2009 03:32:16 PM
  16. * Author: david@optixx.org
  17. *
  18. * =====================================================================================
  19. */
  20. #include <stdlib.h>
  21. #include <stdint.h>
  22. #include <avr/io.h>
  23. #include <util/delay.h> /* for _delay_ms() */
  24. #include <avr/interrupt.h>
  25. #include "config.h"
  26. #include "sram.h"
  27. #include "system.h"
  28. #include "uart.h"
  29. #include "debug.h"
  30. #include "info.h"
  31. #include "requests.h"
  32. void system_init(void)
  33. {
  34. snes_reset_hi();
  35. snes_reset_off();
  36. snes_irq_hi();
  37. snes_irq_off();
  38. }
  39. void system_reset()
  40. {
  41. info_P(PSTR("Reset SNES\n"));
  42. cli();
  43. snes_reset_on();
  44. snes_reset_lo();
  45. _delay_ms(2);
  46. snes_reset_hi();
  47. snes_reset_off();
  48. sei();
  49. }
  50. void system_send_irq()
  51. {
  52. snes_irq_on();
  53. snes_irq_lo();
  54. _delay_us(20);
  55. snes_irq_hi();
  56. snes_irq_off();
  57. }
  58. void system_bus_avr()
  59. {
  60. info_P(PSTR("Activate AVR bus\n"));
  61. avr_bus_active();
  62. info_P(PSTR("Disable SNES WR\n"));
  63. snes_wr_disable();
  64. }
  65. void system_bus_snes()
  66. {
  67. snes_wr_disable();
  68. info_P(PSTR("Disable SNES WR\n"));
  69. snes_bus_active();
  70. info_P(PSTR("Activate SNES bus\n"));
  71. irq_stop();
  72. }
  73. void system_rom_mode(usb_transaction_t *usb_trans)
  74. {
  75. if (usb_trans->req_bank_size == 0x8000) {
  76. snes_lorom();
  77. info_P(PSTR("Set SNES lowrom \n"));
  78. } else {
  79. snes_hirom();
  80. info_P(PSTR("Set SNES hirom \n"));
  81. }
  82. }