I have ported my old project “pNesX” game console emulator to the nucleo.

Dependencies:   SDFileSystem mbed

Intro

I have ported my old project “pNesX” to the STM32 Nucleo. The pNesX is a NES emulator for the PlayStation that I have created 16 years ago!

Emulation part was almost without change, the sound part was newly added.

Parts

STM32 Nucleo F446RE
QVGA 2.2 TFT SPI (with the SD card slot)
Audio jack(TS or TRS)
USB Connector
Register 100k, 10k, 4.7k, 100
Capacitor 0.01uF, 2.2uF
Breadboard
Wires
Computer Speakers
USB GamePad

Wiring diagram

/media/uploads/beaglescout007/nucleo_ex06_emu.png

TFT J2Nucleo
VCC3V3
GNDGND
CSPB_5(D4)
ResetPA_10(D2) Pull Up(100k)
D/CPA_8(D7)
MOSIPA_7(D11)
SCKPA_5(D13)
LEDLED-100ohm-3V3
MISOPA_6(D12)
TFT J4Nucleo
SD_CSPA_9
SD_MOSIPB_15
SD_MISOPB_14
SD_SCKPB_13
AudioNucleo
TIPPA_4(A2)
USB con.Nucleo
GNDGND
+PA_12
-PA_11
5V5V

https://youtu.be/jL24IjT6LnI

Limitations

  • Since the rest of the RAM is about 50kbyte, maximum capacity of the game ROM is about 50kbyte.
  • The length of the file name up to 32 characters.
  • The number of files in the folder is up to 100.

Used Library

Revision:
0:3dac1f1bc9e0
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBHost/USBDeviceConnected.h	Sun Apr 03 07:45:29 2016 +0000
@@ -0,0 +1,134 @@
+/* mbed USBHost Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "USBEndpoint.h"
+#include "USBHostConf.h"
+#include "myvector.h"
+#include "mymap.h"
+
+class USBEndpoint;
+
+struct INTERFACE {
+    INTERFACE(uint8_t _class, uint8_t _subclass, uint8_t _protocol) {
+        intf_class = _class;
+        intf_subclass = _subclass;
+        intf_protocol = _protocol;
+    }
+    uint8_t intf_class;
+    uint8_t intf_subclass;
+    uint8_t intf_protocol;
+    myvector<USBEndpoint*>ep; 
+}; 
+
+/**
+* USBDeviceConnected class
+*/
+class USBDeviceConnected {
+public:
+
+    /**
+    * Constructor
+    */
+    USBDeviceConnected();
+
+    /**
+    * Attach an USBEndpoint to this device
+    *
+    * @param intf_nb interface number
+    * @param ep pointeur on the USBEndpoint which will be attached
+    * @returns true if successful, false otherwise
+    */
+    bool addEndpoint(uint8_t intf_nb, USBEndpoint * ep);
+
+    /**
+    * Retrieve an USBEndpoint by its TYPE and DIRECTION
+    *
+    * @param intf_nb the interface on which to lookup the USBEndpoint
+    * @param type type of the USBEndpoint looked for
+    * @param dir direction of the USBEndpoint looked for
+    * @param index the index of the USBEndpoint whitin the interface
+    * @returns pointer on the USBEndpoint if found, NULL otherwise
+    */
+    USBEndpoint * getEndpoint(uint8_t intf_nb, ENDPOINT_TYPE type, ENDPOINT_DIRECTION dir, uint8_t index = 0);
+
+    /**
+    * Retrieve an USBEndpoint by its index
+    *
+    * @param intf_nb interface number
+    * @param index index of the USBEndpoint
+    * @returns pointer on the USBEndpoint if found, NULL otherwise
+    */
+    USBEndpoint * getEndpoint(uint8_t intf_nb, uint8_t index);
+
+    /**
+    * Add a new interface to this device
+    *
+    * @param intf_nb interface number
+    * @param intf_class interface class
+    * @param intf_subclass interface subclass
+    * @param intf_protocol interface protocol
+    * @returns true if successful, false otherwise
+    */
+    bool addInterface(uint8_t intf_nb, uint8_t intf_class, uint8_t intf_subclass, uint8_t intf_protocol);
+
+    /**
+    * Disconnect the device by calling a callback function registered by a driver
+    */
+    void disconnect();
+
+    void init(USBDeviceConnected* parent, uint8_t _port, bool _lowSpeed);
+    void setAddress(uint8_t addr_) { addr = addr_; };
+    void setVid(uint16_t vid_) { vid = vid_; };
+    void setPid(uint16_t pid_) { pid = pid_; };
+    void setClass(uint8_t device_class_) { device_class = device_class_; }
+    void setSubClass(uint8_t device_subclass_) { device_subclass = device_subclass_; };
+    void setProtocol(uint8_t pr) { proto = pr; };
+    void setEnumerated() { enumerated = true; };
+    void setNbIntf(uint8_t nb_intf) {nb_interf = nb_intf; };
+    void setSpeed(bool _lowSpeed) { lowSpeed = _lowSpeed; }
+    void setName(const char * name_, uint8_t intf_nb) { return; };
+    void setEpCtl(USBEndpoint* ep) { ep_ctl = ep; }
+
+    static int getNewAddress() {
+        static int addr = 1;
+        return addr++;
+    }
+    uint8_t getAddress() { return addr; };
+    uint16_t getVid() { return vid; };
+    uint16_t getPid() { return pid; };
+    uint8_t getClass() { return device_class; };
+    bool getSpeed() { return lowSpeed; }
+    bool isEnumerated() { return enumerated; };
+    USBEndpoint* getEpCtl() { return ep_ctl; }
+
+private:
+    USBDeviceConnected* hub_parent;
+    mymap<int,INTERFACE*>intf;
+    uint8_t port;
+    uint16_t vid;
+    uint16_t pid;
+    uint8_t addr;
+    uint8_t device_class;
+    uint8_t device_subclass;
+    uint8_t proto;
+    bool lowSpeed;
+    bool enumerated;
+    uint8_t nb_interf;
+    USBEndpoint* ep_ctl;
+    void init();
+};
+