About this app

What is the purpose of this application?

You can create a GUI to operate Intel (formerly Altera) FPGA's Avalon bus in a short time. You can operate FPGA from Android without Nios II CPU.
You can place buttons, timers, graphs, etc., and describe the processing in Python.
Likewise, you can write a simple game by describing the placement and processing of 3D objects in Python.


What program should be written to ESP8266 / ESP32?

Arduino sketch　http://rapidnack.com/?p=835
Operation explanation - Display　http://rapidnack.com/?p=918
SPI Bridge Scope　http://rapidnack.com/?p=1831

Please write the above Arduino sketch to ESP.
You can use the following methods to access the Avalon bus in the FPGA.

byte[] WriteBytePacket(UInt32 addr, byte data, int timeoutInSec = 3)
byte[] WriteUInt16Packet(UInt32 addr, UInt16 data, int timeoutInSec = 3)
byte[] WriteUInt32Packet(UInt32 addr, UInt32 data, int timeoutInSec = 3)
byte[] WriteBytePacket(UInt32 addr, byte[] dataBytes, bool isIncremental = false, int timeoutInSec = 3)
byte[] WriteUInt16Packet(UInt32 addr, UInt16[] dataArray, bool isIncremental = false, int timeoutInSec = 3)
byte[] WriteUInt32Packet(UInt32 addr, UInt32[] dataArray, bool isIncremental = false, int timeoutInSec = 3)
byte ReadBytePacket(UInt32 addr, int timeoutInSec = 3)
UInt16 ReadUInt16Packet(UInt32 addr, int timeoutInSec = 3)
UInt32 ReadUInt32Packet(UInt32 addr, int timeoutInSec = 3)
byte[] ReadBytePacket(UInt16 size, UInt32 addr, bool isIncremental = false, int timeoutInSec = 3)
UInt16[] ReadUInt16Packet(UInt16 size, UInt32 addr, bool isIncremental = false, int timeoutInSec = 3)
UInt32[] ReadUInt32Packet(UInt16 size, UInt32 addr, bool isIncremental = false, int timeoutInSec = 3)


The following is a sketch for ESP32.
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#include <SPI.h>
#include <WiFi.h>

const char* ssid     = "your-ssid";
const char* password = "your-password";

WiFiServer server(2002);
WiFiClient client;

#define SPI_BUF_LEN 1024
byte spiBuf[SPI_BUF_LEN];
byte spiReadBuf[SPI_BUF_LEN];

void setup() {
  Serial.begin(57600);

  SPI.begin();
  SPI.setFrequency(24000000);
  SPI.setDataMode(SPI_MODE1);
  SPI.setBitOrder(MSBFIRST);
  pinMode(SS, OUTPUT);
  digitalWrite(SS, HIGH);

  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  //WiFi.mode(WIFI_STA);  // Disable Access Point
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected"); 
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  server.begin();
  Serial.println("Server started");
}

void loop() {
  if (!client.connected()) {
    // try to connect to a new client
    client = server.available();
  } else {
    // read data from the connected client
    int n = client.available();
    if (n > 0) {
      //Serial.print("available: ");
      //Serial.println(n);
      if (n > SPI_BUF_LEN) {
        n = SPI_BUF_LEN;
      }

      // transfer data to/from SPI
      client.readBytes(spiBuf, n);
      digitalWrite(SS, LOW);
      SPI.transferBytes(spiBuf, spiReadBuf, n);
      digitalWrite(SS, HIGH);

      // return data to client
      client.write(spiReadBuf, n);
    }
  }
}
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New features

Panel "SPI Bridge Scope" added

App Permissions

Allows applications to open network sockets.
Allows applications to access information about networks.