{
  "format": "evn-blocks",
  "version": 3,
  "title": "UART: minimal",
  "needs": "a jumper wire from TX to RX on Serial 1 (or a device talking 115200 baud lines there)",
  "description": "Sends a line out of Serial 1 and prints the line that comes back. With a wire from TX to RX on the Serial 1 header the board hears itself; with another device on the header, that device answers.",
  "workspace": {
    "blocks": {
      "languageVersion": 0,
      "blocks": [
        {
          "type": "evn_setup_start",
          "x": 30,
          "y": 30,
          "next": {
            "block": {
              "type": "evn_uart_setup",
              "fields": {
                "PORT": "1",
                "BAUD": "115200"
              }
            }
          }
        },
        {
          "type": "evn_program_start",
          "x": 30,
          "y": 115,
          "next": {
            "block": {
              "type": "evn_uart_send",
              "fields": {
                "PORT": "1",
                "NEWLINE": true
              },
              "inputs": {
                "TEXT": {
                  "shadow": {
                    "type": "text",
                    "fields": {
                      "TEXT": "hello"
                    }
                  }
                }
              },
              "next": {
                "block": {
                  "type": "text_print",
                  "inputs": {
                    "TEXT": {
                      "block": {
                        "type": "text_join",
                        "inputs": {
                          "ADD0": {
                            "shadow": {
                              "type": "text",
                              "fields": {
                                "TEXT": "heard: "
                              }
                            }
                          },
                          "ADD1": {
                            "block": {
                              "type": "evn_uart_line",
                              "fields": {
                                "PORT": "1"
                              },
                              "inputs": {
                                "TIMEOUT": {
                                  "shadow": {
                                    "type": "math_number",
                                    "fields": {
                                      "NUM": 1000
                                    }
                                  }
                                }
                              }
                            }
                          }
                        },
                        "extraState": {
                          "itemCount": 2
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      ]
    }
  }
}