content/hp34970a_6.rst

Thu, 10 Nov 2022 15:31:51 +0100

author
David Douard <david.douard@sdf3.org>
date
Thu, 10 Nov 2022 15:31:51 +0100
changeset 140
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Update pygpibtoolkit project url

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1 ==========================================
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2 HP 34970A Data Acquisition Unit - part 6
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3 ==========================================
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4
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5
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6 :Author: David Douard
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7 :Category: Electronics
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8 :Tags: HP, 34970A, HP34970A, DMM, repair, test equipment
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9 :series: HP 34970A repair
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10 :series_index: 6
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11
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12
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13 Quick follow up; I recently got back on this project to try to complete it and fix
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14 remaining problems.
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15
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16 The source code for the firmware is available here:
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17
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18 https://hg.sdfa3.org/hp34970-firmware
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19
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20 The Kicad project is available here:
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21
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22 https://hg.sdfa3.org/hp34970-pcb
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23
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24
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25 Making the USBDevice work
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26 =========================
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27
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28 As described in the `previous episode <{filename}/hp34970a_5.rst>`_, I could not make
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29 the USBDevice of the STM32F303RD work with `mbed-os <https://os.mbed.com/>`_ framework I
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30 use to write the firmware.
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31
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32 The `STM32F303RD
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33 <https://www.st.com/en/microcontrollers-microprocessors/stm32f303rd.html>`_ is not yet
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34 officially supported by mbed-os (mainl because there is no `NUCLEO
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35 <https://www.st.com/en/evaluation-tools/stm32-nucleo-boards.html>`_ board with
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36 this CPU.
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37
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38 However the STM32F303RE is supported, at least partially. For example, the USBDevice is
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39 not working at all in the latest version of mbed-os (6.15.0). But some `work has been
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40 done recently <https://github.com/ARMmbed/mbed-os/pull/15116>`_ to enable USB_DEVICE on
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41 CPUs of the STM32F3 family. But this last PR was not enoght to make the USB device work;
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42 I have submitted a `PR <https://github.com/ARMmbed/mbed-os/pull/15132>`_ that needs to
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43 be merged to make the USB device actually work.
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44
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45 Also, the difference between the 2 being (as far as I know) only the size of the flash size
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46 (384KB vs. 512 KB).
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47
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48 So I had 3 problems to solve:
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49
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50 - compile the code for a custom board using the mbed framework in platformio,
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51 - use a custom CPU decription,
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52 - use a patched version of the latest version of mbed-os in platformio (while the
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53 officially supported version at this moment is only the 6.9.0).
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54
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55
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56 Custom version of mbed in platformio
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57 ------------------------------------
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58
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59 Using a custom version of a framework (here mbed) in platformio is not properly
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60 documented. But thanks to `the response
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61 <https://community.platformio.org/t/support-for-mbed-os-6-stable-and-mature-apis-cloud-services-support-enhancements-to-the-bare-metal-profile/15079/9>`_
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62 to my question on the `platformio forum <https://community.platformio.org/>`_, I could
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63 make it work. Obviously, I submitted `a PR
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64 <https://github.com/platformio/platformio-docs/pull/214>`_ to `platformio-docs
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65 <https://github.com/platformio/platformio-docs>`_.
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66
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67 So now I have my (more or less) `up to date repository
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68 <https://github.com/douardda/platformio-framework-mbed>`_ usable as `platform_packages`
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69 config argument.
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70
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71 Custom board and CPU description
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72 --------------------------------
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73
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74 This part I am not completely sure how it should be done. There are actually 2 parts:
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75 - tell mbed about the CPU description,
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76 - tell platformio about is and use it.
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77
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78 The platformio part is `documented here
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79 <https://docs.platformio.org/en/latest/platforms/creating_board.html>`_
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80
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81 It mostly consists in creating a json file in the `boards/` directory of the platformio
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82 project directory.
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83
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84 For this project, I used the description of the NUCLEO_F303RE as starting point. The
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85 file is `boards/hp34970_fp_f303rd.json
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86 <https://hg.sdfa3.org/hp34970-firmware/file/tip/boards/hp34970_fp_f303rd.json>`_ in the
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87 `firmware source code repository <https://hg.sdfa3.org/hp34970-firmware/>`_.
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88
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89 Once the board is described, it can be used in the `platformio.ini` file:
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90
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91 .. code-block:: bash
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92
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93 ~/e/hp34970-firmware$ pio boards | grep hp34
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94 hp34970_fp_f303rd STM32F303RDT7 72MHz 384KB 64KB HP34970 Replace Front Panel Board (STM32F303RD, 64k RAM, 384k Flash)
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95
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96
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97
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98 Then we need to tell mbed about this board. This is `documented there
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99 <https://os.mbed.com/docs/mbed-os/v6.15/porting/porting-custom-boards.html>`_
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100
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101 It is a matter of creating a `custom_targets.json` file with the board description.
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102 Again, I used the existing NUCLEO_F303RE as starting point, then added/removed what I
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103 needed for this project:
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104
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105 .. code-block:: json
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106
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107 {
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108 "HP34970_FP_F303RD": {
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109 "inherits": [
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110 "MCU_STM32F303xE"
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111 ],
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112 "overrides": {
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113 "clock_source": "USE_PLL_HSE_XTAL"
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114 },
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115 "device_has_add": [
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116 "USBDEVICE"
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117 ],
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118 "mbed_rom_size": "0x60000",
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119 "bootloader_supported": true,
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120 "device_name": "STM32F303RE"
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121 }
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122 }
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123
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124 Then the actual description (pins, memory config, etc.) are C files put in a
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125 `TARGET_HP34970_FP_F303RD` directory. Here again, started from files copied from the
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126 `STM32F303xE target
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127 <https://github.com/ARMmbed/mbed-os/tree/master/targets/TARGET_STM/TARGET_STM32F3/TARGET_STM32F303xE>`_.
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128
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129
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130 End result
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131 ==========
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132
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133 It took me some time, but in the end, I finally got a firmware that works OK, including
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134 a working USB serial port. For now, this serial connection is still used only for
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135 debugging purpose (and firmware upload in DFU mode), but it may be improved in the
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136 future, if needs be.
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137
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138 So I could put the HP34970A back together (at last). I drilled a couple of small holes
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139 for the Reset and DFU buttons and a (not so) square hole for the USB plug in the blue
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140 glass.
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141
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142 The result looks very decent to me:
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143
f3070bd842cd HP34970A - part 6
David Douard <david.douard@sdfa3.org>
parents:
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144 .. image:: {static}/images/hp34970a/finished.jpg
f3070bd842cd HP34970A - part 6
David Douard <david.douard@sdfa3.org>
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145 :alt: finished look of the device with the replacement front panel
f3070bd842cd HP34970A - part 6
David Douard <david.douard@sdfa3.org>
parents:
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146 :class: image-process-large-photo
f3070bd842cd HP34970A - part 6
David Douard <david.douard@sdfa3.org>
parents:
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147
f3070bd842cd HP34970A - part 6
David Douard <david.douard@sdfa3.org>
parents:
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148 .. peertube:: 14d0e7e2-74d5-44fe-90e9-d6b102ae01a1

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