Update 'USB protocol'
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1e2b0e2774
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eb6b66af0f
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@ -73,7 +73,7 @@ The device operates in two (or three, depending on how you count) operting modes
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In bootloader mode, you first have to send a magic number for the device (stored in the FT240X' EEPROM) to enable some functionality: when authenticated, in bootloader mode, you can access the Spartan-3AN's internal SPI flash, as well as maybe a few extra bits.
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You can switch to application mode (and back to bootloader mode) at any time, however, allegedly (this is the behavior of the [ScanaPLUS](https://sigrok.org/wiki/IKALOGIC_ScanaPLUS) device, which has a similar setup) capturing samples (in application mode) will not work when not authenticated in bootloader mode. (TODO: does switching to bootloader mode from application mode bring you into authenticated mode when already authenticated before switching to application mode?)
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You can switch to application mode (and back to bootloader mode) at any time, however, allegedly (this is the behavior of the [ScanaPLUS](https://sigrok.org/wiki/IKALOGIC_ScanaPLUS) device, which has a similar setup) capturing samples (in application mode) will not work when not authenticated in bootloader mode.
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A log of libftd2xx function calls from ScanaStudio, in various scenarios, is available [here](https://cloud.lain.faith/s/RpcBp89MA2LDqqY).
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@ -157,6 +157,8 @@ This blob is 24 bytes in size.
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* **`0x16`**: Capture mode flag. `0x01` in capture and mixed mode, `0x00` in generate mode.
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* **`0x17`**: Generate mode flag. `0x01` in generate and mixed mode, `0x00` in capture mode.
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"Passive settings" (used in the "Example transfers" section) means settings that retain frequency, voltage, ..., settings, but disable triggers and reset capture/generate bytes.
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__**Memory settings**__: These three fields are each 3-byte little-endian values:
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1. `MS1` denotes the memory size used for storing captured signal data.
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@ -222,7 +224,93 @@ field: |LVL|0 | pw_max ' |OVRL|0 | ' pw_min |IGN
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### Example transfers
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#### Spartan-3AN internal SPI flash read ID and status
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Below is what the ScanaStudio software does.
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Abbreviations/terms used:
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* `APP`: application mode variant of a command
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* `BL` bootloader mode variant of a command
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* `passive`: see "Settings blob".
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* `SC/WFT`: signal capture/wait-for-trigger
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* While a status response is technically the same byte repeated 4 byte, the byte is only listed once below.
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#### Device init/reset
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1. Send settings (`0xf1` APP) (passive) (probably spurious)
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1. Cancel ongoing SC/WFT (`0xf0 0x00`)
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1. Get status (`0xfd 0x00 0x01 0x02 0xfe`)
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* Should return either `0x09` (device just started up) or `0x22` (already inited).
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1. Switch to bootloader mode (`0x94`)
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1. Read 3 magic auth bytes from FT240X EEPROM at (little-endian) word addresses 0x12 and 0x13.
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1. Send the above magic auth bytes (`0xf1` BL)
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1. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x01`.
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1. Switch to application mode (`0x93`)
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1. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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1. Send settings (`0xf1` APP) (passive)
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#### Capture a signal
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1. Cancel ongoing SC/WFT (`0xf0 0x00`)
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2. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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3. Send settings (`0xf1`) (passive) (spurious?)
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4. Send settings (`0xf1')
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5. Send trigger steps (`0xf4`) (optional)
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6. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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7. Cancel ongoing SC/WFT (`0xf0 0x00`)
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8. Start SC/WFT (`0xf0 0x01`)
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9. Read 4-byte response (trigger position, result)
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10. Cancel ongoing SC/WFT (`0xf0 0x00`)
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11. Start capture data download (`0xf0 0x06`)
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12. Read capture data bytes (`MS1*2` bytes)
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13. Cancel ongoing SC/WFT (`0xf0 0x00`)
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14. Send settings (`0xf1`) (passive)
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15. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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#### Generate a signal
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1. Cancel ongoing SC/WFT (`0xf0 0x00`)
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2. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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3. Send settings (`0xf1`) (passive, but generator mode enabled)
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4. Start generator upload pattern (`0xf0 0x05 0xf3`)
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5. Send generator pattern bytes (`MS2*2` bytes)
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6. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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7. Cancel ongoing SC/WFT (`0xf0 0x00`)
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8. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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9. Start pattern generation, indefinitely (`0xf0 0x02`) or once (`0xf0 0x07`)
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10. Send settings (`0xf1`)
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11. (wait...)
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12. Stop pattern generation: Cancel ongoing SC/WFT (`0xf0 0x00`)
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13. Send settings (`0xf1`) (passive, but generator mode enabled)
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14. Send settings (`0xf1`) (passive)
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15. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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#### Perform a mixed-mode transaction
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1. Cancel ongoing SC/WFT (`0xf0 0x00`)
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2. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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3. Send settings (`0xf1`) (passive, but capture and generator modes enabled)
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4. Start generator upload pattern (`0xf0 0x05 0xf3`)
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5. Send generator pattern bytes (`(MS2-MS1)*2` bytes)
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6. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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7. Cancel ongoing SC/WFT (`0xf0 0x00`)
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8. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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9. Send settings (`0xf1`)
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10. Send trigger steps (`0xf4`) (optional) (?)
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11. Cancel ongoing SC/WFT (`0xf0 0x00`)
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12. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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13. Send settings (`0xf1`)
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14. Send settings (`0xf1`) (spurious?)
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15. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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16. Cancel ongoing SC/WFT (`0xf0 0x00`)
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17. Start mixed-mode action (`0xf0 0x03`)
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18. Read 4-byte response (trigger position, result)
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19. Cancel ongoing SC/WFT (`0xf0 0x00`)
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20. Start capture data download (`0xf0 0x06`)
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21. Read capture data bytes (`MS1*2` bytes)
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22. Cancel ongoing SC/WFT (`0xf0 0x00`)
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23. Send settings (`0xf1`) (passive)
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24. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
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#### Spartan-3AN internal SPI flash: read ID and status
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```
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Flash ID:
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@ -238,7 +326,7 @@ Status:
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Send 0x91,0x00, no read data
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```
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#### Spartan-3AN internal SPI flash dump
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#### Spartan-3AN internal SPI flash: dump
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```
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Send 0x90,0x00, no read data
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