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/USBHostHub.cpp	Sun Apr 03 07:45:29 2016 +0000
@@ -0,0 +1,113 @@
+#include "USBHost.h"
+
+#define PORT_CONNECTION   0
+#define PORT_ENABLE       1
+#define PORT_SUSPEND      2
+#define PORT_OVER_CURRENT 3
+#define PORT_RESET        4
+#define PORT_POWER        8
+#define PORT_LOW_SPEED    9
+
+#define C_PORT_CONNECTION   16
+#define C_PORT_ENABLE       17
+#define C_PORT_SUSPEND      18
+#define C_PORT_OVER_CURRENT 19
+#define C_PORT_RESET        20
+
+bool USBHost::Hub(USBDeviceConnected* dev) {
+    USB_INFO("New HUB: VID:%04x PID:%04x [dev: %p]", dev->getVid(), dev->getPid(), dev);
+    HubDescriptor hubdesc;
+    // get HUB descriptor
+    int rc = controlRead(dev, 
+                        USB_DEVICE_TO_HOST | USB_REQUEST_TYPE_CLASS,
+                        GET_DESCRIPTOR,
+                        0x29 << 8, 0, reinterpret_cast<uint8_t*>(&hubdesc), 
+                        sizeof(HubDescriptor));
+    USB_TEST_ASSERT(rc == USB_TYPE_OK);
+    if (rc != USB_TYPE_OK) {
+        return false;
+    }
+    USB_DBG_HEX((uint8_t*)&hubdesc, sizeof(hubdesc));
+
+    uint32_t status;
+    rc = controlRead( dev,
+                      0xa0, 0, 0, 0, reinterpret_cast<uint8_t*>(&status), 4);
+    USB_TEST_ASSERT(rc == USB_TYPE_OK);
+    if (rc != USB_TYPE_OK) {
+        return false;
+    }
+    USB_DBG("HUB STATUS: %08X\n", status);
+
+    for(int i = 1; i <= hubdesc.bNbrPorts; i++) {
+        SetPortPower(dev, i); // power on
+        wait_ms(hubdesc.bPwrOn2PwrGood*2);
+        uint32_t status;
+        GetPortStatus(dev, i, &status);
+        USB_DBG("port: %d status: %08X\n", i, status);
+        if (status & 0x010000) { // Connect Status Change, has changed
+            USB_TEST_ASSERT(status & 0x000001);
+            ClearPortFeature(dev, C_PORT_CONNECTION, i);
+            int lowSpeed = 0;
+            if (status & 0x0200) {
+                lowSpeed = 1;
+            }
+            PortReset(dev, i);
+            if (!addDevice(dev, i, lowSpeed)) {
+                ClearPortPower(dev, i); // power off
+            }
+        } else {
+            ClearPortPower(dev, i); // power off
+        }
+    }
+    return false;
+}
+
+
+int USBHost::SetPortPower(USBDeviceConnected* dev, int port)
+{
+    return SetPortFeature(dev, PORT_POWER, port);
+}
+
+int USBHost::ClearPortPower(USBDeviceConnected* dev, int port)
+{
+    return ClearPortFeature(dev, PORT_POWER, port);
+}
+
+int USBHost::SetPortFeature(USBDeviceConnected* dev, int feature, int index)
+{
+    return controlWrite(dev, 0x23, SET_FEATURE,feature,index,0,0);
+}
+
+int USBHost::ClearPortFeature(USBDeviceConnected* dev, int feature, int index)
+{
+    return controlWrite(dev, 0x23, CLEAR_FEATURE,feature,index,0,0);
+}
+
+int USBHost::SetPortReset(USBDeviceConnected* dev, int port)
+{
+    return SetPortFeature(dev, PORT_RESET, port);
+}
+
+int USBHost::GetPortStatus(USBDeviceConnected* dev, int port, uint32_t* status)
+{
+    return controlRead(dev, 0xa3, GET_STATUS, 0, port, (uint8_t*)status, 4);
+}
+
+int USBHost::PortReset(USBDeviceConnected* dev, int port)
+{
+    USB_DBG("%p port=%d\n", this, port);
+    USB_TEST_ASSERT(port >= 1);
+    SetPortReset(dev, port);
+    // wait reset
+    for(int i = 0; i < 100; i++) {
+        uint32_t status;    
+        GetPortStatus(dev, port, &status);
+        USB_DBG("RESET port: %d status: %08X\n", port, status);
+        if (status & 0x100000) { // Reset change , Reset complete
+            return USB_TYPE_OK;
+        }
+        wait_ms(5);
+     }
+     return USB_TYPE_ERROR;
+}
+