content/hp34970a_3.rst

Tue, 28 Aug 2018 15:12:24 +0200

author
David Douard <david.douard@logilab.fr>
date
Tue, 28 Aug 2018 15:12:24 +0200
changeset 109
96e9f64b86ed
parent 66
70aad9a1272b
child 115
6b6e13653348
permissions
-rw-r--r--

[prologix] minor improvments

63
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
1 ==========================================
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
2 HP 34970A Data Acquisition Unit - part 3
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
3 ==========================================
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
4
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
5 :Author: David Douard
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
6 :Category: Electronics
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
7 :Tags: HP, 34970A, DMM, repair, test equipment
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
8 :series: HP 34970A repair
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
9 :series_index: 3
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
10
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
11
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
12 As explained in `the previous post in this series <{filename}/hp34970a_2.rst>`_,
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
13 I've started to sniff the serial protocol between the main board and
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
14 the display panel so I can replace the failed VFD by an OLED or TFT
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
15 display managed by an arduino or similar.
63
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
16
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
17 Protocol
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
18 ========
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
19
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
20 The serial communication takes place at a rather unusual speed: 187.5
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
21 kbits/s, otherwise, a standard 8N1 scheme.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
22
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
23 The protocol consist in a transmission frame with a start of
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
24 transmission handcheck, some commands with arguments, and an end of
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
25 transmission packet.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
26
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
27 Each transmitted character is acknowledged by the receiver, either by
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
28 a ``<0x99>`` (for the initial handcheck) or by a ``<0x00>`` for the
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
29 other ones..
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
30
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
31 I've only probed the CPU->DP communications. I don't really care the
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
32 other way fr now since I plan to keep the original 80C51 so it manages
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
33 this protocol and handle the keyboard.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
34
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
35 In the direction CPU->DP, we can find:
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
36
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
37 - ``<0x66>``: start of transmission, must be acknowledged by a
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
38 ``<0x99>`` by the receiver; this start of transmission is then followed by a "command":
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
39
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
40 - ``<CMD> <NCHAR> <CHAR1> ... <CHARN>``: the command byte is followed
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
41 by the numer of characters sent as argument, then the characters
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
42 themselves.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
43
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
44 - ``<0x55>``: end of transmission.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
45
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
46
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
47 I've only identified 3 commands for now, but these are the most
63
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
48 important ones:
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
49
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
50 - ``0x00``: send the chars to the main display
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
51 - ``0x0C``: send the chars to the secondary channel display
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
52 - ``0x0A``: set the display indicators
63
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
53
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
54
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
55 Main display
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
56 ------------
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
57
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
58 Characters are simply sent to the display. However, to specify that a
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
59 part of the string to display should be less bright (usually, the
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
60 selected option is bright and the other ones are dim), the CPU insert
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
61 a special character (need to check which hexadecimal value it is) at
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
62 the beginning and the end of the dim part of the string.
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
63
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
65 Channel display
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
66 ---------------
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
67
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
68 Seems there is nothing special there. The frame payload always consist
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
69 in 3 characters (the 3 digits).
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
70
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
71
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
72 Indicator flags
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
73 ---------------
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
74
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
75 The indicator flags are always sent as 4 bytes, each bit controlling
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
76 one indicator.
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
77
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
78 The indicator flags I've been able to identify so far
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
79 are below.
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
80
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
81 Let's say the frame is: ``<0x0A> <0x04> <F1> <F2> <F3> <F4>``, then:
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
82
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
83
66
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
84 - F1.8 =
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
85 - F1.7 = HI
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
86 - F1.6 = Alarm
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
87 - F1.5 = LO
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
88 - F1.4 = Channels
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
89 - F1.3 = Channels box
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
90 - F1.2 = Mx+B enabled
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
91 - F1.1 = Alarm enabled (or the alarm frame)
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
92
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
93 - F2.5 = 4W
66
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
94 - F2.4 = Alarm 1 ?
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
95 - F2.3 = Alarm 3
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
96 - F2.2 = Alarm 4
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
97 - F2.1 = Alarm 2
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
98
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
99 - F3.6 =
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
100 - F3.5 =
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
101
66
70aad9a1272b [hp34970a] part 4
David Douard <david.douard@logilab.fr>
parents: 64
diff changeset
102 - F4.8 =
64
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
103 - F4.7 = CONFIG (not sure)
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
104 - F4.6 =
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
105 - F4.5 = MON
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
106 - F4.4 = VIEW
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
107 - F4.3 =
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
108 - F4.2 =
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
109 - F4.1 =
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
110
dcb6f3fcbd1e [hp34970a] add some stuff on the flags decoding
David Douard <david.douard@logilab.fr>
parents: 63
diff changeset
111
63
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
112
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
113 Quick prototype
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
114 ===============
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
115
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
116 With this very incomplete reverse ingeeniring of the communication, I
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
117 have enough meat to try a quick prototype.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
118
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
119 I've used an Arduino Uno and a cheap 3.2" TFT color display. As I
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
120 wanted to have my serial protocol to debug the code for the beginning,
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
121 I've used the SoftwareSerial_ library for this prototype.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
122
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
123 The result is this beautiful clean setup:
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
124
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
125 .. image:: {filename}/images/hp34970a/poc_display.jpg
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
126 :alt: A very quick proof of concept of an arduino based display replacement for the HP34970A.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
127
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
128
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
129 As you can see, it works: I have the main content od the VFD display
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
130 on my TFT module!
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
131
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
132 .. image:: {filename}/images/hp34970a/poc_display_mux_off.jpg
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
133 :alt: The FTF display showing the main area and the current channel area.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
134
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
135 .. image:: {filename}/images/hp34970a/poc_display_vdc.jpg
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
136 :alt: The same with the channel 209 configured as VDC, 6.5digits.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
137
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
138
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
139 The job is far from finished however: I still have to figure out how
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
140 the "annotation" flags are encoded and display them, and most
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
141 importantly, I have it make it work with the hardwre USART of the
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
142 mega328. This seems to mbe necessary because I have glitches
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
143 sometimes. But I'm very happy it worked almost at my first try. I was
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
144 quite surprised since the baudrate is above the maximum officially
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
145 supported one (115200).
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
146
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
147 I'll release the code of the prototype any time soon.
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
148
64a7d3e2b2a8 [hp34970a] poc of an arduino display
David Douard <david.douard@logilab.fr>
parents:
diff changeset
149 .. _SoftwareSerial: https://www.arduino.cc/en/Reference/SoftwareSerial

mercurial