You can create a GUI to operate Intel FPGA's Avalon bus without Nios II.

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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