Difference between revisions of "SainSmart DDS140"
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== Hardware == | == Hardware == | ||
* '''USB''': [http://www.cypress.com/documentation/datasheets/cy7c68013a-cy7c68014a-cy7c68015a-cy7c68016a-ez-usb-fx2lp-usb Cypress CY7C68013A-100AXC] (FX2LP) ([http://www.cypress.com/file/138911/download datasheet]) | * Main unit: | ||
* '''64-kbyte I²C EEPROM''': [http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010831 Microchip 24LC64I] ([http://ww1.microchip.com/downloads/en/DeviceDoc/21189f.pdf datasheet]) | ** '''USB''': [http://www.cypress.com/documentation/datasheets/cy7c68013a-cy7c68014a-cy7c68015a-cy7c68016a-ez-usb-fx2lp-usb Cypress CY7C68013A-100AXC] (FX2LP) ([http://www.cypress.com/file/138911/download datasheet]) | ||
* '''Dual 8bit, 100MSPS ADC''': [https://translate.google.com/translate?hl=en&sl=zh-CN&tl=en&u=http%3A%2F%2Fwww.mxtronics.com%2Fn107%2Fn124%2Fn181%2Fn184%2Fc692%2Fcontent.html MXTronix MXT2088] ([http://www.mxtronics.com/n107/n124/n181/n184/c692/attr/2630.pdf datasheet]) | ** '''64-kbyte I²C EEPROM''': [http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010831 Microchip 24LC64I] ([http://ww1.microchip.com/downloads/en/DeviceDoc/21189f.pdf datasheet]) | ||
* 5x '''CMOS differential 4-channel analog mux/demux with logic-level conversion''': [http://www.ti.com/product/cd4052b/description Texas Instruments CD4052BM] ([http://www.ti.com/lit/gpn/cd4052b datasheet]) | ** '''Dual 8bit, 100MSPS ADC''': [https://translate.google.com/translate?hl=en&sl=zh-CN&tl=en&u=http%3A%2F%2Fwww.mxtronics.com%2Fn107%2Fn124%2Fn181%2Fn184%2Fc692%2Fcontent.html MXTronix MXT2088] ([http://www.mxtronics.com/n107/n124/n181/n184/c692/attr/2630.pdf datasheet]) | ||
* '''CPLD''': [https://www.altera.com/products/cpld/max-series/max-ii/overview.html Altera MAX II EPM240T100CN] ([https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/hb/max2/max2_mii5v1.pdf datasheet]) | ** 5x '''CMOS differential 4-channel analog mux/demux with logic-level conversion''': [http://www.ti.com/product/cd4052b/description Texas Instruments CD4052BM] ([http://www.ti.com/lit/gpn/cd4052b datasheet]) | ||
* '''64K x 16 CMOS anyc SRAM (8ns)''': [http://www.issi.com/US/product-asynchronous-sram.shtml ISSI IS61LV6416-8TI] ([http://www.issi.com/WW/pdf/61LV6416_L.pdf datasheet]) | ** '''CPLD''': [https://www.altera.com/products/cpld/max-series/max-ii/overview.html Altera MAX II EPM240T100CN] ([https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/hb/max2/max2_mii5v1.pdf datasheet]) | ||
* '''Dual voltage comparator''': [http://www.ti.com/product/LM393 TI LM393] ([http://www.ti.com/lit/gpn/lm393 datasheet]) | ** '''64K x 16 CMOS anyc SRAM (8ns)''': [http://www.issi.com/US/product-asynchronous-sram.shtml ISSI IS61LV6416-8TI] ([http://www.issi.com/WW/pdf/61LV6416_L.pdf datasheet]) | ||
* '''1A low-dropout voltage regulator (3.3V):''' [http://www.advanced-monolithic.com/products/voltreg.html#1117 Advanced Monolithic Systems AMS1117-3.3] ([http://www.advanced-monolithic.com/pdf/ds1117.pdf datasheet]) | ** '''Dual voltage comparator''': [http://www.ti.com/product/LM393 TI LM393] ([http://www.ti.com/lit/gpn/lm393 datasheet]) | ||
* '''Crystal''': 24MHz (for Cypres FX2) | ** '''1A low-dropout voltage regulator (3.3V):''' [http://www.advanced-monolithic.com/products/voltreg.html#1117 Advanced Monolithic Systems AMS1117-3.3] ([http://www.advanced-monolithic.com/pdf/ds1117.pdf datasheet]) | ||
* '''Crystal''': 80MHz (for Altera MAX II) | ** '''Crystal''': 24MHz (for Cypres FX2) | ||
** '''Crystal''': 80MHz (for Altera MAX II) | |||
* Logic analyzer: | |||
** '''Octal translating transceiver''' [https://www.nexperia.com/products/analog-logic-ics/asynchronous-interface-logic/voltage-translators-level-shifters/series/74LVC4245A.html NXP (Nexperia) LVC4245A] ([https://assets.nexperia.com/documents/data-sheet/74LVC4245A.pdf datasheet]) | |||
* Signal generator: | |||
** '''CMOS Single 8-Channel Analog Multiplexer/Demultiplexer''' [https://www.ti.com/product/CD4052B Texas Instruments CD4052B] ([https://www.ti.com/lit/ds/symlink/cd4052b.pdf datasheet]) | |||
** '''90 MHz Variable Gain Amplifier''' [https://www.analog.com/en/products/ad603.html Analog Devices AD603AR] ([https://www.analog.com/media/en/technical-documentation/data-sheets/AD603.pdf datasheet]) | |||
** '''Dual Operational Amplifier''' [https://www.analog.com/en/products/ad826.html Analag Devices AD826] ([https://www.analog.com/media/en/technical-documentation/data-sheets/AD826.pdf datasheet]) | |||
== Photos - Oscillocope (main unit) == | == Photos - Oscillocope (main unit) == | ||
| Line 52: | Line 61: | ||
File:Saintsmart dds140 - signal generator - PCB bottom.jpg|<small>PCB, bottom</small> | File:Saintsmart dds140 - signal generator - PCB bottom.jpg|<small>PCB, bottom</small> | ||
File:Saintsmart dds140 - signal generator - PCB top (closeup).jpg|<small>PCB, top (closer view)</small> | File:Saintsmart dds140 - signal generator - PCB top (closeup).jpg|<small>PCB, top (closer view)</small> | ||
</gallery> | |||
== Photos - Logic analyzer extension == | |||
<gallery> | |||
File:Saintsmart dds140 - logic analyzer - device top.jpg|<small>Device, top</small> | |||
File:Saintsmart dds140 - logic analyzer - PCB top.jpg|<small>PCB, top</small> | |||
File:Saintsmart dds140 - logic analyzer - PCB top (closeup).jpg|<small>PCB, top (closer view)</small> | |||
</gallery> | </gallery> | ||
== Protocol == | == Protocol == | ||
The protocol used by this device is not based on anything else. | |||
It seems to be based on a raw data exchange using a WinUSB pipe. | |||
=== Sending commands === | |||
The DDS140 uses a simple set of command codes (uint8_t, from 0 to 255) that may take arguments. | |||
The host software uses an helper DLL to send theses commands to the device. | |||
In this DLL, two functions act as a wrapper around ''WinUsb_ControlTransfer()'': | |||
* '''USBCtrlTransSimple()''' is used for simple commands, that does not take arguments | |||
* '''USBCtrlTrans()''' is used for more complex commands, i.e that takes arguments | |||
It has to be noted that both functions can return data. | |||
The list of currently reversed command codes is available here: | |||
* https://gitlab.com/SamantazFox/dds140-reverse-engineering/-/blob/master/program/Commands_summary.rst (main) | |||
* https://github.com/SamantazFox/dds140-reverse-engineering/blob/master/program/Commands_summary.rst (mirror) | |||
=== Getting the data back === | |||
the process that gets the data back from the device is not well understood yet. | |||
It seems that the helper DLL contains a wrapper function around '''WinUsb_ReadPipe()''' (for raw buffer read), | |||
plus a lot of pre-processing (via the '''DataPreDisposal()''' function) which is directly dependant of the GUI | |||
settings (graph zoom and position). | |||
This has yet to be reversed. | |||
== Firmware == | == Firmware == | ||
| Line 60: | Line 106: | ||
== Resources == | == Resources == | ||
* [ | * [https://www.sainsmart.com/products/dds140-pc-based-usb-oscilloscope-40mhz-bandwidth-200ms-s-black vendors page] | ||
* [http:// | * [http://s3.amazonaws.com/s3.image.smart/download/101-10-144.rar Vendor software + manuals] | ||
* [http://www.eevblog.com/forum/testgear/sainsmart-dds120-usb-oscilloscope-(buudai-bm102)/ EEVBlog forum thread] | * [http://www.eevblog.com/forum/testgear/sainsmart-dds120-usb-oscilloscope-(buudai-bm102)/ EEVBlog forum thread] | ||
* [https://sourceforge.net/projects/logic140/ SourceForge Logic140 project] | * [https://sourceforge.net/projects/logic140/ SourceForge Logic140 project] | ||
Latest revision as of 22:46, 26 September 2020
The SainSmart DDS140 is a USB-based, 2-channel oscilloscope with an analog bandwidth of 40MS/s and 200MS/s sampling rate.
Optionally, it also supports usage as signal generator or logic analyzer.
See SainSmart DDS140/Info for more details (such as lsusb -v output) about the device.
Hardware
- Main unit:
- USB: Cypress CY7C68013A-100AXC (FX2LP) (datasheet)
- 64-kbyte I²C EEPROM: Microchip 24LC64I (datasheet)
- Dual 8bit, 100MSPS ADC: MXTronix MXT2088 (datasheet)
- 5x CMOS differential 4-channel analog mux/demux with logic-level conversion: Texas Instruments CD4052BM (datasheet)
- CPLD: Altera MAX II EPM240T100CN (datasheet)
- 64K x 16 CMOS anyc SRAM (8ns): ISSI IS61LV6416-8TI (datasheet)
- Dual voltage comparator: TI LM393 (datasheet)
- 1A low-dropout voltage regulator (3.3V): Advanced Monolithic Systems AMS1117-3.3 (datasheet)
- Crystal: 24MHz (for Cypres FX2)
- Crystal: 80MHz (for Altera MAX II)
- Logic analyzer:
- Octal translating transceiver NXP (Nexperia) LVC4245A (datasheet)
- Signal generator:
- CMOS Single 8-Channel Analog Multiplexer/Demultiplexer Texas Instruments CD4052B (datasheet)
- 90 MHz Variable Gain Amplifier Analog Devices AD603AR (datasheet)
- Dual Operational Amplifier Analag Devices AD826 (datasheet)
Photos - Oscillocope (main unit)
Package contents
Sticker
Device, top
Device, bottom
USB
Connectors
2nd connector
PCB, top
PCB, bottom
MXT2088
Cypress FX2
Microchip 24LC64I
Altera MAXII EPM240T100CN
ISSI IS61LV6416-8TI
80MHz crystal
AMS1117-3.3
TI CD4502BM
LM393
?
?
Photos - Signal generator extension
Device, top
PCB, top
PCB, bottom
PCB, top (closer view)
.jpg)
Photos - Logic analyzer extension
Device, top
PCB, top
PCB, top (closer view)
.jpg)
Protocol
The protocol used by this device is not based on anything else. It seems to be based on a raw data exchange using a WinUSB pipe.
Sending commands
The DDS140 uses a simple set of command codes (uint8_t, from 0 to 255) that may take arguments.
The host software uses an helper DLL to send theses commands to the device. In this DLL, two functions act as a wrapper around WinUsb_ControlTransfer():
- USBCtrlTransSimple() is used for simple commands, that does not take arguments
- USBCtrlTrans() is used for more complex commands, i.e that takes arguments
It has to be noted that both functions can return data.
The list of currently reversed command codes is available here:
- https://gitlab.com/SamantazFox/dds140-reverse-engineering/-/blob/master/program/Commands_summary.rst (main)
- https://github.com/SamantazFox/dds140-reverse-engineering/blob/master/program/Commands_summary.rst (mirror)
Getting the data back
the process that gets the data back from the device is not well understood yet. It seems that the helper DLL contains a wrapper function around WinUsb_ReadPipe() (for raw buffer read), plus a lot of pre-processing (via the DataPreDisposal() function) which is directly dependant of the GUI settings (graph zoom and position).
This has yet to be reversed.