Komunikacja RS 232

[Pikczu]

Żeby dobrze odbierało musi być bufor.
W zrozumieniu zagadnienia pomoże Ci przykład z folderu sample-> serial.

Code: [Zaznacz cały] [Rozwiń/Zwiń]

1. '-----------------------------------------------------------------------------------------
2. 'name                     : rs232buffer.bas
3. 'copyright                : (c) 1995-2020, MCS Electronics
4. 'purpose                  : example shows the difference between normal and buffered
5. '                           serial INPUT
6. 'micro                    : Mega48
7. 'suited for demo          : yes
8. 'commercial addon needed  : no
9. '-----------------------------------------------------------------------------------------
10.  
11. $regfile = "m48def.dat"                                     ' specify the used micro
12. $crystal = 8000000                                          ' used crystal frequency
13. $baud = 19200                                               ' use baud rate
14. $hwstack = 32                                               ' default use 32 for the hardware stack
15. $swstack = 10                                               ' default use 10 for the SW stack
16. $framesize = 40                                             ' default use 40 for the frame space
17.  
18. 'first compile and run this program with the line below remarked
19. 'Config Serialin = Buffered , Size = 20
20.  
21.  
22. Dim Nm As String * 1
23.  
24. 'the enabling of interrupts is not needed for the normal serial mode
25. 'So the line below must be remarked to for the first test
26. 'Enable Interrupts
27.  
28. Print "Start"
29. Do
30.    'get a char from the UART
31.  
32.    If Ischarwaiting() = 1 Then                              'was there a char?
33.       Nm = Waitkey()
34.       Print Nm                                              'print it
35.    End If
36.  
37.    Wait 1                                                   'wait 1 second
38. Loop
39.  
40. 'You will see that when you slowly enter characters in the terminal emulator
41. 'they will be received/displayed.
42. 'When you enter them fast you will see that you loose some chars
43.  
44. 'NOW remove the remarks from line 11 and 18
45. 'and compile and program and run again
46. 'This time the chars are received by an interrupt routine and are
47. 'stored in a buffer. This way you will not loose characters providing that
48. 'you empty the buffer
49. 'So when you fast type abcdefg, they will be printed after each other with the
50. '1 second delay
51.  
52. 'Using the CONFIG SERIAL=BUFFERED, SIZE = 10 for example will
53. 'use some SRAM memory
54. 'The following internal variables will be generated :
55. '_Rs_head_ptr0   BYTE , a pointer to the location of the start of the buffer
56. '_Rs_tail_ptr0   BYTE , a pointer to the location of tail of the buffer
57. '_RS232INBUF0 BYTE ARRAY , the actual buffer with the size of SIZE

Jeśli angielski sprawia Ci trudności użyj google translate.
Następny krok to wklej swój cały kod.