> Complete documentation index: [llms.txt](/llms.txt). Markdown versions of all pages are available by appending `.md` to page URLs.

# Bridge 1.1 API - SPI Commands

### Set Voltage

See [#set-bus-voltage](/user-guide/protocols-and-interfaces/bridge-11-api/bridge-11-api-i2c-commands/#set-bus-voltage "mention").

### SPI Initialization

*   **Command Request:**

    ```json
    {
      "transaction_id": "1",
      "command": "spi_init",
      "params": {
        {
          "mode": "<0..3>",
          "clockFrequencyInKHz": "<Unsigned Integer>",
          "bitOrder": "<MSB|LSB>",
          "bitsPerTransfer": "<8|16>",
          "chipSelect": "<0..3>",
          "chipSelectPol": "<0,1>"
        }
      }
    }
    ```
* **Responses:**
  *   Immediate Promise Response:

      ```json
      {
        "transaction_id": "1",
        "status": "success",
        "type": "command_response",
        "is_promise": true,
        "data": {
          "command": "spi_init"
        }
      }
      ```
  *   Final Response:

      ```json
      {
        "transaction_id": "1",
        "status": "success",
        "type": "command_response",
        "is_promise": false,
        "data": {
          "is_response_to": "spi_init",
          "status": "success"
        }
      }
      ```

### SPI Configuration

*   **Command Request:**

    ```json
    {
      "transaction_id": "1",
      "command": "spi_config",
      "params": {
        {
          "mode": "<0..3>",
          "clockFrequencyInKHz": "<Unsigned Integer>",
          "bitOrder": "<MSB|LSB>",
          "bitsPerTransfer": "<8|16>",
          "chipSelect": "<0..3>",
          "chipSelectPol": "<0,1>"
        }
      }
    }
    ```
* **Responses:**
  *   Immediate Promise Response:

      ```json
      {
        "transaction_id": "1",
        "status": "success",
        "type": "command_response",
        "is_promise": true,
        "data": {
          "command": "spi_config"
        }
      }
      ```
  *   Final Response:

      ```json
      {
        "transaction_id": "1",
        "status": "success",
        "type": "command_response",
        "is_promise": false,
        "data": {
          "is_response_to": "spi_config",
          "status": "success"
        }
      }
      ```

### SPI Transfer

*   **Command Request:**

    ```json
    {
      "transaction_id": "1",
      "command": "spi_transfer",
      "params": {
        "bytesToRead": "<Unsigned Integer>",
        "writeBuffer": "<Hex String (e.g. DEADBEEF)>"
        }
      }
    }
    ```
* **Responses:**
  *   Immediate Promise Response:

      ```json
      {
        "transaction_id": "1",
        "status": "success",
        "type": "command_response",
        "is_promise": true,
        "data": {
          "command": "spi_transfer"
        }
      }
      ```
  *   Final Response:

      ```json
      {
        "transaction_id": "1",
        "status": "success",
        "is_promise": false,
        "data": {
          "is_response_to": "spi_transfer",
          "status": "success",
          "payload_length": <Unsigned Integer>,
          "data": <Array of 2-Byte Hex String (e.g. "DE", "AD", "BE", "EF")>}
        }
      }
      ```