spacepaste

Paste details

reply | raw

  1.  
  2. import time
  3. import microcontroller
  4. import digitalio
  6. class SWD:
  7. def __init__(swdio, swclk):
  8. self.swdio = swdio
  9. self.swclk = swclk
  11. def swd_setup(self):
  12. self.swclk = digitalio.DigitalInOut(swclk)
  13. self.swclk.switch_to_output()
  14. self.swclk.value = 1
  15. self.swdio = digitalio.DigitalInOut(swdio)
  16. self.swdio.switch_to_output()
  17. self.swdio.value = 1
  19. def sw_clk_cycle(self):
  20. self.swclk.value = 0
  21. microontroller.delay_us(1)
  22. self.swclk.value = 1
  23. microcontroller.delay_us(1)
  25. def sw_write_bit(self, bit):
  26. self.swdio.switch_to_output()
  27. self.swdio.value = bit
  28. self.swclk.value = 0
  29. microcontroller.delay_us(1)
  30. self.swclk.value = 1
  31. microcontroller.delay_us(1)
  33. def sw_read_bit(self):
  34. self.swclk.value = 0
  35. microcontroller.delay_us(1)
  36. self.swdio.switch_to_input()
  37. bit = swdio.value
  38. self.swclk.value = 1
  39. microcontroller.delay_us(1)
  40. return bit
  42. def swd_transfer(self, request, data):
  43. parity = 0
  44. self.sw_write_bit(1)
  45. bit = request >> 0
  46. self.sw_write_bit(bit)
  47. parity += bit
  48. bit = request >> 1
  49. self.sw_write_bit(bit)
  50. parity += bit
  51. bit = request >> 2
  52. self.sw_write_bit(bit)
  53. parity += bit
  54. bit = request >> 3
  55. self.sw_write_bit(bit)
  56. parity += bit
  57. self.sw_write_bit(parity)
  58. self.sw_write_bit(0)
  59. self.sw_write_bit(1)
  60.  
Powered by spacepaste. Paste removal.