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  1.  
  2. #![feature(used, asm)]
  3. #![no_std]
  4. #![no_main]
  6. extern crate circuit_playground_express as hal;
  7. extern crate panic_abort;
  9. #[macro_use(entry)]
  10. extern crate cortex_m_rt;
  12. use hal::clock::GenericClockController;
  13. use hal::delay::Delay;
  14. use hal::prelude::*;
  15. use hal::{CorePeripherals, Peripherals};
  17. entry!(main);
  19. fn main() -> ! {
  20. let mut peripherals = Peripherals::take().unwrap();
  21. let core = CorePeripherals::take().unwrap();
  22. let mut clocks = GenericClockController::with_internal_32kosc(
  23. peripherals.GCLK,
  24. &mut peripherals.PM,
  25. &mut peripherals.SYSCTRL,
  26. &mut peripherals.NVMCTRL,
  27. );
  28. let mut pins = hal::Pins::new(peripherals.PORT);
  29. let mut neopixel = pins.neopixel.into_open_drain_output(&mut pins.port);
  30. let mut delay = Delay::new(core.SYST, &mut clocks);
  32. let pixels: [u8;3] = [0xff, 0x00, 0x00];
  33. let mut counter: usize = 0;
  34. let mut p: u8 = pixels[counter];
  35. counter += 1;
  36. let mut bitmask: u8 = 0x80;
  38. loop {
  39. neopixel.set_high();
  40. unsafe{
  41. asm!("nop; nop; nop; nop; nop; nop; nop; nop;
  42. nop; nop; nop;");
  43. }
  44. if p & bitmask != 0 {
  45. unsafe{
  46. asm!("nop; nop; nop; nop; nop; nop; nop; nop;
  47. nop; nop; nop; nop; nop; nop; nop; nop;
  48. nop; nop; nop; nop; nop; nop; nop; nop;
  49. nop; nop; nop;");
  50. }
  51. neopixel.set_low();
  52. } else {
  53. neopixel.set_low();
  54. unsafe{
  55. asm!("nop; nop; nop; nop; nop; nop; nop; nop;
  56. nop; nop; nop; nop; nop; nop; nop; nop;
  57. nop; nop; nop; nop; nop; nop; nop; nop;
  58. nop; nop; nop;");
  59. }
  60. }
  61. unsafe {
  62. asm!("nop; nop; nop; nop; nop; nop; nop; nop;
  63. nop; nop; nop; nop; nop; nop; nop; nop;
  64. nop; nop; nop; nop; nop; nop; nop; nop;
  65. nop; nop; nop; nop; nop; nop; nop; nop;");
  66. }
  67. bitmask >>= 1;
  68. if bitmask != 0 {
  69. unsafe {
  70. asm!("nop; nop; nop; nop; nop; nop; nop;");
  71. }
  72. } else {
  73. if counter >= pixels.len() {
  74. break;
  75. }
  76. p = pixels[counter];
  77. counter += 1;
  78. bitmask = 0x80;
  79. }
  80. }
  81. loop {}
  82. }
  83.  
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