Tue, 28 Aug 2018 15:12:24 +0200
[prologix] minor improvments
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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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4 | |
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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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10 | |
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11 | |
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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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16 | |
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17 | Protocol |
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18 | ======== |
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19 | |
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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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22 | |
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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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26 | |
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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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30 | |
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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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34 | |
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35 | In the direction CPU->DP, we can find: |
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36 | |
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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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43 | |
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44 | - ``<0x55>``: end of transmission. |
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45 | |
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46 | |
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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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53 | |
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54 | |
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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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63 | |
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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 | |
66 | 84 | - F1.8 = |
85 | - F1.7 = HI | |
86 | - F1.6 = Alarm | |
87 | - F1.5 = LO | |
88 | - F1.4 = Channels | |
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 |
66 | 94 | - F2.4 = Alarm 1 ? |
95 | - F2.3 = Alarm 3 | |
96 | - F2.2 = Alarm 4 | |
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 | |
66 | 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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112 | |
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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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129 | As you can see, it works: I have the main content od the VFD display |
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130 | on my TFT module! |
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131 | |
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132 | .. image:: {filename}/images/hp34970a/poc_display_mux_off.jpg |
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133 | :alt: The FTF display showing the main area and the current channel area. |
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134 | |
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135 | .. image:: {filename}/images/hp34970a/poc_display_vdc.jpg |
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136 | :alt: The same with the channel 209 configured as VDC, 6.5digits. |
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137 | |
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138 | |
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139 | The job is far from finished however: I still have to figure out how |
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140 | the "annotation" flags are encoded and display them, and most |
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141 | importantly, I have it make it work with the hardwre USART of the |
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142 | mega328. This seems to mbe necessary because I have glitches |
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143 | sometimes. But I'm very happy it worked almost at my first try. I was |
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144 | quite surprised since the baudrate is above the maximum officially |
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145 | supported one (115200). |
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146 | |
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147 | I'll release the code of the prototype any time soon. |
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148 | |
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149 | .. _SoftwareSerial: https://www.arduino.cc/en/Reference/SoftwareSerial |