content/hp34970a_3.rst

Tue, 28 Aug 2018 15:05:01 +0200

author
David Douard <david.douard@logilab.fr>
date
Tue, 28 Aug 2018 15:05:01 +0200
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improve hgignore

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

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