Document GPIO 3
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@ -40,6 +40,7 @@ By manipulating these GPIO signals, the Linux system can reset the FPGA firmware
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| 0 | 54 | out (to FPGA) | Global firmware reset |
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| 1 | 55 | in (from FPGA) | Reset status report |
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| 2 | 56 | out (to FPGA) | ADC clock duty cycle stabilizer |
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| 3 | 57 | out (to FPGA) | ADC sample derandomization |
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### GPIO 0: Global firmware reset
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@ -82,6 +83,19 @@ This GPIO signal is asynchronously routed through the FPGA to the ADC.
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Changing the state of this signal may shift the phase of the ADC data clock.
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It must therefore only be changed while the FPGA firmware is in reset.
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### GPIO 3: ADC sample derandomization
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GPIO 3 controls a sample derandomization function in the FPGA.
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- GPIO 3 is an output from the PS to the FPGA.
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- Driving this signal as `0` disables sample derandomization.
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- Driving this signal as `1` enables sample derandomization.
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This signal is only supported on Red Pitaya boards with 4 input channels.
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On these boards, the ADC can optionally be configured to randomize its output
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by XOR-ing the least significant bit into all other bits.
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The derandomization function in the FPGA recovers the original sample values.
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# SPI signals
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@ -1,502 +0,0 @@
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# Remote access
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Remote access to the acquisition system is supported via TCP connections.
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Three TCP server ports are used:
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- port 5001 is used to transfer analog sample data;
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- port 5002 is used to transfer timetagger data;
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- port 5025 is used for commands.
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## Analog sample data stream
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A client may connect to TCP port 5001 to receive analog sample data.
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At most one client can be connected to this port at any time.
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If a new client connects while another connection is still active,
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the server closes the old connection and uses the new connection instead.
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Data flows through the TCP connection in one direction: from the server
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to the client.
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The client must not send anything back to the server.
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Analog sample data are transferred as a sequence of 64-bit binary messages.
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Each message is sent as a group of 8 bytes with the least significant byte first.
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The message stream corresponds to the output data format of the
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analog acquisition chain as described in the FPGA firmware documentation.
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## Timetagger event stream
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A client may connect to TCP port 5002 to receive timetagger data.
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At most one client can be connected to this port at any time.
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If a new client connects while another connection is still active,
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the server closes the old connection and uses the new connection instead.
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Data flows through the TCP connection in one direction: from the server
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to the client.
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The client must not send anything back to the server.
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Timetagger data are transferred as a sequence of 64-bit binary messages.
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Each message is sent as a group of 8 bytes with the least significant byte first.
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The message stream corresponds to the output data format of the timetagger
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as described in the FPGA firmware documentation.
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## Command protocol
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A client may connect to TCP port 5025 to send commands.
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Multiple clients may be simultaneously connected to this port.
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In that case, it is the responsibility of the clients to make sure
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that they do not interfere with eachother.
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The remote control protocol is based on ASCII strings.
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The protocol is vaguely similar to SCPI, but it is not compatible with SCPI.
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Every interaction is initiated by the client sending a command,
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and completed by the server sending a response.
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Each command and each response consists of an ASCII string terminated by linefeed (ASCII 10).
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Commands are case-insensitive.
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The server ignores empty lines and lines that contain only white space characters.
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In all other cases, the server sends one response for every command received, even if the command is not recognized or not supported.
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The server only sends data in response to a command; it never sends data spontaneously.
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A _query_ is a command that ends with a `?` character.
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The server responds to a query either by sending the requested data,
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or by sending an error message.
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An error message starts with the string `ERROR`, followed by
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a space character, followed by a short description of the error.
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The server responds to a non-query command either by sending the string `OK`
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to indicate that the command was completed successfully,
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or by sending an error message.
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Some commands require one or more _parameters_.
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In the command string, the command and parameters are separated from eachother by space characters.
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The response to some queries may consist of multiple data elements.
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In the response string, such data elements are separated by space characters.
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### Example
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| Client | Server |
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|--------------------------|---------------|
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| `AIN:SRATE?` | |
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| | `1000000.000` |
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| `AIN:SRATE:DIVISOR 1000` | |
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| | `OK` |
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| `AIN:SRATE?` | |
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| | `125000.000` |
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| `AIN:NSAMPLES 0` | |
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| | `ERROR Invalid argument` |
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| `Hello` | |
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| | `ERROR Unknown command` |
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### List of commands and queries
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| Command | Description |
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|---------------------------|-------------|
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| `*IDN?` | Instrument identification. |
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| `RESET` | Restore default settings. |
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| `TIMESTAMP?` | Timestamp counter. |
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| `AIN:CHANNELS:COUNT?` | Number of input channels. |
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| `AIN:CHANNELS:ACTIVE` | Number of active input channels. |
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| `AIN:CHn:RANGE` | Analog input range. |
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| `AIN:CHn:OFFSET` | Offset calibration. |
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| `AIN:CHn:GAIN` | Gain calibration. |
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| `AIN:CAL:SAVE` | Save calibration. |
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| `AIN:CHn:SAMPLE[:RAW]?` | Read ADC sample. |
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| `AIN:CHn:MINMAX[:RAW]?` | Read ADC range monitor. |
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| `AIN:MINMAX:CLEAR` | Reset ADC range monitor. |
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| `AIN:SRATE` | Sample rate. |
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| `AIN:SRATE:DIVISOR` | Downsample factor. |
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| `AIN:SRATE:MODE` | Downsample mode. |
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| `AIN:SRATE:GAIN?` | Downsample gain. |
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| `AIN:NSAMPLES` | Number of samples per trigger. |
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| `AIN:TRIGGER` | Force a trigger event. |
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| `AIN:TRIGGER:MODE` | Select trigger mode. |
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| `AIN:TRIGGER:DELAY` | Trigger delay. |
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| `AIN:TRIGGER:STATUS?` | Trigger status. |
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| `AIN:TRIGGER:EXT:CHANNEL` | External trigger channel. |
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| `AIN:TRIGGER:EXT:EDGE` | External trigger edge. |
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| `AIN:ACQUIRE:ENABLE` | Enable analog acquisition. |
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| `TT:SAMPLE?` | Digital input state. |
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| `TT:EVENT:MASK` | Timetagger event mask. |
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| `TT:MARK` | Emit timetagger marker. |
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| `TEMP:FPGA?` | FPGA temperature. |
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| `IPCFG[:SAVED]` | IP address configuration. |
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| `HALT` | Shut down system. |
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| `REBOOT` | Reboot system. |
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### `*IDN?`
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Query: `*IDN?` <br>
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Response: string with 4 comma-separated fields.
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This query returns the instrument identification string.
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The response consists of 4 comma-separated fields:
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`manufacturer,model,serialnr,version`.
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### `RESET`
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Command: `RESET`
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This command restores most non-persistent settings to power-on defaults.
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It resets all settings, except for the following:
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- saved calibration;
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- active network configuration;
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- saved network configuration.
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The active calibration is restored to match the saved calibration.
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Other settings are restored to fixed power-on defaults.
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Any ongoing analog acquisition is stopped.
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### `TIMESTAMP?`
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Query: `TIMESTAMP?` <br>
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Response: decimal integer, representing the current timestamp in units of 8 ns.
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### `AIN:CHANNELS:COUNT?`
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Query: `AIN:CHANNELS:COUNT?` <br>
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Response: number of supported analog input channels.
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The response is `2` for a standard Red Pitaya, or `4` for a 4-input Red Pitaya.
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### `AIN:CHANNELS:ACTIVE`
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Command: `AIN:CHANNELS:ACTIVE n` <br>
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Parameter _n_: number of active channels, either `2` or `4`.
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This command is only supported on a 4-input Red Pitaya.
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When 2 channels are active, only analog input channels 1 and 2 are included in analog acquisition data.
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Query: `AIN:CHANNELS:ACTIVE?` <br>
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Response: number of active channels, either `2` or `4`.
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### `AIN:CHn:RANGE`
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Command: `AIN:CHn:RANGE range` <br>
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Field _n_: channel number, in range 1 to 4. <br>
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Parameter _range_: input range, either `LO` or `HI`.
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This command specifies which set of calibration coefficients should be used to interpret ADC samples.
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Note that this command does not change the actual input range of the Red Pitaya.
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The input range can only be changed by manually placing a jumper on the board.
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Query: `AIN:CHn:RANGE?` <br>
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Response: currently configured input range, either `LO` or `HI`.
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### `AIN:CHn:OFFSET[:LO|HI]`
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Command: `AIN:CHn:OFFSET offs` <br>
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Field _n_: channel number, in range 1 to 4. <br>
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Parameter _offs_: floating point number specifying the offset calibration.
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The offset calibration specifies the raw ADC code corresponding to analog input level 0 Volt.
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The expected value is in the middle of the ADC code range, i.e. approximately 8192.
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The plain variant of the command configures the offset calibration for the active input range of the channel.
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Command: `AIN:CHn:OFFSET:LO offs` <br>
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Command: `AIN:CHn:OFFSET:HI offs` <br>
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These variants of the command configure the offset calibration for a specific input range.
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Query: `AIN:CHn:OFFSET?` <br>
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Query: `AIN:CHn:OFFSET:LO?` <br>
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Query: `AIN:CHn:OFFSET:HI?` <br>
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Response: floating point number indicating the offset calibration for the active input range or the specified input range.
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### `AIN:CHn:GAIN[:LO|HI]`
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Command: `AIN:CHn:GAIN gain` <br>
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Field _n_: channel number, in range 1 to 4. <br>
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Parameter _gain_: floating point number specifying the gain calibration.
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The gain calibration specifies the difference in raw ADC code corresponding to a 1 Volt difference in analog input level.
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The expected value is negative, because the Red Pitaya uses an inverting input amplifier.
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The plain variant of the command configures the gain calibration for the active input range of the channel.
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Command: `AIN:CHn:GAIN:LO offs` <br>
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Command: `AIN:CHn:GAIN:HI offs` <br>
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These variants of the command configure the gain calibration for a specific input range.
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Query: `AIN:CHn:GAIN?` <br>
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Query: `AIN:CHn:GAIN:LO?` <br>
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Query: `AIN:CHn:GAIN:HI?` <br>
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Response: floating point number indicating the gain calibration for the active input range or the specified input range.
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### `AIN:CAL:SAVE`
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Command: `AIN:CAL:SAVE`
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This command saves the active calibration settings to the SD card, to be used as power-on defaults.
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The following settings are saved: for each analog input channel, its input range, offset calibration for low and high range, and gain calibration for low and high range.
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### `AIN:CHn:SAMPLE[:RAW]?`
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Query: `AIN:CHn:SAMPLE?` <br>
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Field _n_: channel number, in range 1 to 4. <br>
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Response: floating point number representing the most recent ADC sample for the specified input channel in Volt.
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Query: `AIN:CHn:SAMPLE:RAW?` <br>
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Response: decimal integer representing the raw ADC code of the most recent sample for the specified input channel.
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Sample rate settings are not applicable to this command.
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The ADC always samples at 125 MSa/s.
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This command returns the most recent single sample, without downsampling or averaging.
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### `AIN:CHn:MINMAX[:RAW]?`
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Query: `AIN:CHn:MINMAX?` <br>
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Field _n_: channel number, in range 1 to 4. <br>
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Response: two floating point numbers separated by a space character, representing the minimum and maximum input level in Volt.
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Query: `AIN:CHn:MINMAX:RAW?` <br>
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Response: two decimal integers separated by a space character, representing the minimum and maximum raw ADC code.
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The returned values are the minimum and maximum sample values that occurred since the last reset of the range monitor.
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### `AIN:MINMAX:CLEAR`
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Command: `AIN:MINMAX:CLEAR`
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This command resets the input range monitors of all analog input channels.
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### `AIN:SRATE`
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Command: `AIN:SRATE rate` <br>
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Parameter _rate_: floating point number specifying the sample rate in samples per second.
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This command configures the effective sample rate of the acquisition chain.
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Valid sample rates are in range 500 to 125e6 samples per second.
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The specified sample rate will be rounded to the nearest supported rate.
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Query: `AIN:SRATE?` <br>
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Response: floating point number representing the sample rate in samples per second.
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### `AIN:SRATE:DIVISOR`
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Command: `AIN:SRATE:DIVISOR divisor` <br>
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Parameter _divisor_: decimal integer specifying the downsample factor.
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This command configures the downsample factor of the acquisition chain.
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Valid downsample factors are in range 1 to 250000.
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Query: `AIN:SRATE:DIVISOR?` <br>
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Response: decimal integer representing the downsample factor.
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**Note:** Commands `AIN:SRATE` and `AIN:SRATE:DIVISOR` are different methods to control the same internal setting.
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**Note:** When auto-trigger mode is selected, the downsample factor must be at least 2.
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When 4 channels are active, the downsample factor must be at least 2, or 4 if auto-trigger mode is selected.
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### `AIN:SRATE:MODE`
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Command: `AIN:SRATE:MODE mode` <br>
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Parameter _mode_: downsample mode, either `DECIMATE` or `AVERAGE`.
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This command selects downsampling by means of decimation or averaging.
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Downsampling works by collecting groups of consecutive raw ADC samples and translating each group into a single downsampled value.
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The number of raw samples per group is determined by the downsample factor (see `AIN:SRATE:DIVISOR`).
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In mode `DECIMATE`, the first sample of a group is used as downsampled value; the other samples in the group are discarded.
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In mode `AVERAGE`, the sum of all samples in a group is used as downsampled value.
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Query: `AIN:SRATE:MODE?` <br>
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Response: either `DECIMATE` or `AVERAGE`.
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### `AIN:SRATE:GAIN?`
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Query: `AIN:SRATE:GAIN?` <br>
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Response: floating point number representing the effective gain factor due to downsampling.
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The value returned by this query depends on the downsample factor and the downsample mode.
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In downsample mode `DECIMATE`, this query always returns 1.0.
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In downsample mode `AVERAGE`, this query returns a number between 1 and 1024.
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### `AIN:NSAMPLES`
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Command: `AIN:NSAMPLES n` <br>
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Parameter _n_: decimal integer specifying the number of samples per channel per trigger.
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This command configures the number of (downsampled) samples to collect for each trigger.
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Valid values are from 1 to 65536.
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Query: `AIN:NSAMPLES?` <br>
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Response: decimal integer representing the number of samples per trigger.
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### `AIN:TRIGGER`
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Command: `AIN:TRIGGER`
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This command forces a trigger to occur, regardless of the configured trigger mode.
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Note that even a forced trigger may be ignored if the acquisition chain is still processing a previous trigger.
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### `AIN:TRIGGER:MODE`
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Command: `AIN:TRIGGER:MODE mode` <br>
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Parameter _mode_: trigger mode, either `NONE` or `AUTO` or `EXTERNAL` or `EXTERNAL_ONCE`.
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**Note:** When trigger mode `EXTERNAL_ONCE` is selected, the trigger mode automatically changes to `NONE` as soon as a trigger occurs.
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Query: `AIN:TRIGGER:MODE?` <br>
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Response: active trigger mode.
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### `AIN:TRIGGER:DELAY`
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Command: `AIN:TRIGGER:DELAY n` <br>
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Parameter _n_: decimal integer specifying trigger delay as a number of 8 ns cycles.
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This configures a delay between trigger detection and the start of sample collection.
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Valid values are from 0 to 65535.
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Query: `AIN:TRIGGER:DELAY?` <br>
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Response: decimal integer representing the trigger delay as a number of 8 ns cycles.
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### `AIN:TRIGGER:STATUS?`
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Query: `AIN:TRIGGER:STATUS?` <br>
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Response: trigger status, either `BUSY` or `WAITING`.
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This query returns `BUSY` when the acquisition chain is processing a trigger, or `WAITING` if the acquisition chain is waiting for a trigger.
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### `AIN:TRIGGER:EXT:CHANNEL`
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Command: `AIN:TRIGGER:EXT:CHANNEL n` <br>
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Parameter _n_: decimal integer specifying a digital input channel, in range 0 to 3.
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This command selects the digital input channel to use as external trigger.
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Query: `AIN:TRIGGER:EXT:CHANNEL?` <br>
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Response: decimal integer specifying the selected digital input channel.
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### `AIN:TRIGGER:EXT:EDGE`
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Command: `AIN:TRIGGER:EXT:EDGE edge` <br>
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Parameter _edge_: trigger edge, either `RISING` or `FALLING`.
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This command selects rising or falling edges in the external trigger signal.
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Query: `AIN:TRIGGER:EXT:EDGE?` <br>
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Response: either `RISING` or `FALLING`.
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### `AIN:ACQUIRE:ENABLE`
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Command: `AIN:ACQUIRE:ENABLE en` <br>
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Parameter _en_: either `0` or `1`.
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This command enables or disables analog acquisition.
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When enabled, analog samples are acquired according to the configured trigger mode.
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When disabled, all triggers are ignored and any ongoing analog acquisition stops immediately.
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Query: `AIN:ACQUIRE:ENABLE?` <br>
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Response: either `0` or `1`.
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### `TT:SAMPLE?`
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Query: `TT:SAMPLE?` <br>
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Response: array of 4 digits `0` or `1`, separated by space characters.
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This query returns the input state of all digital input channels.
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### `TT:EVENT:MASK`
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Command: `TT:EVENT:MASK mask` <br>
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Parameter _mask_: decimal integer specifying a bit mask of enabled events.
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This command configures the set of enabled timetagger events.
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The integer value of _mask_ represents an 8-bit mask.
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Each bit position denotes an event type, as follows:
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| Bit index | Value | Description |
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|-----------|-------|-------------|
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| 0 | 1 | Rising edge on digital input 0. |
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| 1 | 2 | Falling edge on digital input 0. |
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| 2 | 4 | Rising edge on digital input 1. |
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| 3 | 8 | Falling edge on digital input 1. |
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| 4 | 16 | Rising edge on digital input 2. |
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| 5 | 32 | Falling edge on digital input 2. |
|
||||
| 6 | 64 | Rising edge on digital input 3. |
|
||||
| 7 | 128 | Falling edge on digital input 3. |
|
||||
|
||||
Query: `TT:EVENT:MASK?` <br>
|
||||
Response: decimal integer representing the event mask.
|
||||
|
||||
### `TT:MARK`
|
||||
|
||||
Command: `TT:MARK`
|
||||
|
||||
This command emits a marker record in the timetagger event stream.
|
||||
|
||||
### `TEMP:FPGA?`
|
||||
|
||||
Query: `TEMP:FPGA?` <br>
|
||||
Response: floating point number representing the temperature in Celsius.
|
||||
|
||||
The temperature is measured by the internal temperature sensor of the Zynq FPGA.
|
||||
|
||||
### `IPCFG[:SAVED]`
|
||||
|
||||
Command: `IPCFG DHCP` <br>
|
||||
Command: `IPCFG STATIC ipaddr netmask gateway` <br>
|
||||
Parameter _ipaddr_: IPv4 address in dotted-quad notation. <br>
|
||||
Parameter _netmask_: netmask in dotted-quad notation. <br>
|
||||
Parameter _gateway_: optional gateway address in dotted-quad notation.
|
||||
|
||||
This command configures the IP address of the system.
|
||||
It expects between 1 and 4 parameters, depending on the specific address configuration.
|
||||
|
||||
If address mode `DHCP` is selected, the command expects no further parameters.
|
||||
In this mode, the system attempts to get an IPv4 address from a DHCP server on the local network.
|
||||
|
||||
If address mode `STATIC` is selected, the command expects 2 or 3 additional parameters to specify the address, netmask and optional gateway.
|
||||
IP addresses are specified in _dotted-quad_ notation: 4 decimal integers separated by period characters.
|
||||
The parameter _gateway_ may be omitted or specified as `0.0.0.0` to indicate that no gateway should be used.
|
||||
|
||||
The command `IPCFG` takes effect immediately.
|
||||
This command does not send an `OK` response.
|
||||
Instead, all TCP connections are closed while the system prepares to change its IP address.
|
||||
Changing the IP address typically takes a few seconds.
|
||||
When the new address is active, the client may re-connect to the new IP address.
|
||||
|
||||
**Note:** Configuring an invalid IP address may make the system unreachable.
|
||||
In that case, the saved IP address configuration can be restored by power-cycling the system.
|
||||
|
||||
Command: `IPCFG:SAVED DHCP` <br>
|
||||
Command: `IPCFG:SAVED STATIC ipaddr netmask gateway`
|
||||
|
||||
This variant of the command configures the saved IP address configuration.
|
||||
It uses the same set of parameters as `IPCFG`.
|
||||
This command has no effect on the active IP address.
|
||||
When the command completes, it sends an `OK` response and the system continues to function normally.
|
||||
The saved address configuration takes effect on the next reboot of the system.
|
||||
|
||||
Query: `IPCFG?` <br>
|
||||
Query: `IPCFG:SAVED?` <br>
|
||||
Response: active or saved IP address configuration.
|
||||
|
||||
### `HALT`
|
||||
|
||||
Command: `HALT`
|
||||
|
||||
This command iniates a shutdown of the system.
|
||||
It does not send an `OK` response.
|
||||
Instead, all TCP connections are closed while the system initiates shutdown.
|
||||
|
||||
The halt command causes the system to become unresponsive to further commands.
|
||||
To recover from the halt state, the system must be power-cycled.
|
||||
|
||||
### `REBOOT`
|
||||
|
||||
Command: `REBOOT`
|
||||
|
||||
This command initiates a system reboot.
|
||||
It does not send an `OK` response.
|
||||
Instead, all TCP connections are closed while the system initiates shutdown.
|
||||
|
||||
A reboot involves a complete reset of the FPGA and the embedded ARM processor.
|
||||
The system then proceeds as if just powered on.
|
||||
|
||||
Loading…
Reference in New Issue