Added sources for USB Host shield from https://github.com/felis/USB_H…

…ost_Shield.git

libs/USBHost/Max3421e.cpp

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+/* Copyright 2009-2011 Oleg Mazurov, Circuits At Home, http://www.circuitsathome.com */
+/* MAX3421E USB host controller support */
+
+#include "Max3421e.h"
+// #include "Max3421e_constants.h"
+
+static byte vbusState;
+
+/* Functions    */
+
+/* Constructor */
+MAX3421E::MAX3421E()
+{
+    spi_init();  
+    pinMode( MAX_INT, INPUT);
+    pinMode( MAX_GPX, INPUT );
+    pinMode( MAX_SS, OUTPUT );
+    digitalWrite(MAX_SS,HIGH);   
+    pinMode( MAX_RESET, OUTPUT );
+    digitalWrite( MAX_RESET, HIGH );  //release MAX3421E from reset
+}
+
+byte MAX3421E::getVbusState( void )
+{ 
+    return( vbusState );
+}
+/* initialization */
+//void MAX3421E::init()
+//{
+//    /* setup pins */
+//    pinMode( MAX_INT, INPUT);
+//    pinMode( MAX_GPX, INPUT );
+//    pinMode( MAX_SS, OUTPUT );
+//    //pinMode( BPNT_0, OUTPUT );
+//    //pinMode( BPNT_1, OUTPUT );
+//    //digitalWrite( BPNT_0, LOW );
+//    //digitalWrite( BPNT_1, LOW );
+//    Deselect_MAX3421E;              
+//    pinMode( MAX_RESET, OUTPUT );
+//    digitalWrite( MAX_RESET, HIGH );  //release MAX3421E from reset
+//}
+//byte MAX3421E::getVbusState( void )
+//{
+//    return( vbusState );
+//}
+//void MAX3421E::toggle( byte pin )
+//{
+//    digitalWrite( pin, HIGH );
+//    digitalWrite( pin, LOW );
+//}
+/* Single host register write   */
+void MAX3421E::regWr( byte reg, byte val)
+{
+      digitalWrite(MAX_SS,LOW);
+      SPDR = ( reg | 0x02 );
+      while(!( SPSR & ( 1 << SPIF )));
+      SPDR = val;
+      while(!( SPSR & ( 1 << SPIF )));
+      digitalWrite(MAX_SS,HIGH);
+      return;
+}
+/* multiple-byte write */
+/* returns a pointer to a memory position after last written */
+char * MAX3421E::bytesWr( byte reg, byte nbytes, char * data )
+{
+    digitalWrite(MAX_SS,LOW);
+    SPDR = ( reg | 0x02 );
+    while( nbytes-- ) {
+      while(!( SPSR & ( 1 << SPIF )));  //check if previous byte was sent
+      SPDR = ( *data );               // send next data byte
+      data++;                         // advance data pointer
+    }
+    while(!( SPSR & ( 1 << SPIF )));
+    digitalWrite(MAX_SS,HIGH);
+    return( data );
+}
+/* GPIO write. GPIO byte is split between 2 registers, so two writes are needed to write one byte */
+/* GPOUT bits are in the low nibble. 0-3 in IOPINS1, 4-7 in IOPINS2 */
+/* upper 4 bits of IOPINS1, IOPINS2 are read-only, so no masking is necessary */
+void MAX3421E::gpioWr( byte val )
+{
+    regWr( rIOPINS1, val );
+    val = val >>4;
+    regWr( rIOPINS2, val );
+
+    return;     
+}
+/* Single host register read        */
+byte MAX3421E::regRd( byte reg )    
+{
+  byte tmp;
+    digitalWrite(MAX_SS,LOW);
+    SPDR = reg;
+    while(!( SPSR & ( 1 << SPIF )));
+    SPDR = 0; //send empty byte
+    while(!( SPSR & ( 1 << SPIF )));
+    digitalWrite(MAX_SS,HIGH); 
+    return( SPDR );
+}
+/* multiple-bytes register read                             */
+/* returns a pointer to a memory position after last read   */
+char * MAX3421E::bytesRd ( byte reg, byte nbytes, char  * data )
+{
+    digitalWrite(MAX_SS,LOW);
+    SPDR = reg;      
+    while(!( SPSR & ( 1 << SPIF )));    //wait
+    while( nbytes ) {
+      SPDR = 0; //send empty byte
+      nbytes--;
+      while(!( SPSR & ( 1 << SPIF )));
+      *data = SPDR;
+      data++;
+    }
+    digitalWrite(MAX_SS,HIGH);
+    return( data );   
+}
+/* GPIO read. See gpioWr for explanation */
+/* GPIN pins are in high nibbles of IOPINS1, IOPINS2    */
+byte MAX3421E::gpioRd( void )
+{
+ byte tmpbyte = 0;
+    tmpbyte = regRd( rIOPINS2 );            //pins 4-7
+    tmpbyte &= 0xf0;                        //clean lower nibble
+    tmpbyte |= ( regRd( rIOPINS1 ) >>4 ) ;  //shift low bits and OR with upper from previous operation. Upper nibble zeroes during shift, at least with this compiler
+    return( tmpbyte );
+}
+/* reset MAX3421E using chip reset bit. SPI configuration is not affected   */
+boolean MAX3421E::reset()
+{
+  byte tmp = 0;
+    regWr( rUSBCTL, bmCHIPRES );                        //Chip reset. This stops the oscillator
+    regWr( rUSBCTL, 0x00 );                             //Remove the reset
+    while(!(regRd( rUSBIRQ ) & bmOSCOKIRQ )) {          //wait until the PLL is stable
+        tmp++;                                          //timeout after 256 attempts
+        if( tmp == 0 ) {
+            return( false );
+        }
+    }
+    return( true );
+}
+/* turn USB power on/off                                                */
+/* does nothing, returns TRUE. Left for compatibility with old sketches               */
+/* will be deleted eventually                                           */
+///* ON pin of VBUS switch (MAX4793 or similar) is connected to GPOUT7    */
+///* OVERLOAD pin of Vbus switch is connected to GPIN7                    */
+///* OVERLOAD state low. NO OVERLOAD or VBUS OFF state high.              */
+boolean MAX3421E::vbusPwr ( boolean action )
+{
+//  byte tmp;
+//    tmp = regRd( rIOPINS2 );                //copy of IOPINS2
+//    if( action ) {                          //turn on by setting GPOUT7
+//        tmp |= bmGPOUT7;
+//    }
+//    else {                                  //turn off by clearing GPOUT7
+//        tmp &= ~bmGPOUT7;
+//    }
+//    regWr( rIOPINS2, tmp );                 //send GPOUT7
+//    if( action ) {
+//        delay( 60 );
+//    }
+//    if (( regRd( rIOPINS2 ) & bmGPIN7 ) == 0 ) {     // check if overload is present. MAX4793 /FLAG ( pin 4 ) goes low if overload
+//        return( false );
+//    }                      
+    return( true );                                             // power on/off successful                       
+}
+/* probe bus to determine device presense and speed and switch host to this speed */
+void MAX3421E::busprobe( void )
+{
+ byte bus_sample;
+    bus_sample = regRd( rHRSL );            //Get J,K status
+    bus_sample &= ( bmJSTATUS|bmKSTATUS );      //zero the rest of the byte
+    switch( bus_sample ) {                          //start full-speed or low-speed host 
+        case( bmJSTATUS ):
+            if(( regRd( rMODE ) & bmLOWSPEED ) == 0 ) {
+                regWr( rMODE, MODE_FS_HOST );       //start full-speed host
+                vbusState = FSHOST;
+            }
+            else {
+                regWr( rMODE, MODE_LS_HOST);        //start low-speed host
+                vbusState = LSHOST;
+            }
+            break;
+        case( bmKSTATUS ):
+            if(( regRd( rMODE ) & bmLOWSPEED ) == 0 ) {
+                regWr( rMODE, MODE_LS_HOST );       //start low-speed host
+                vbusState = LSHOST;
+            }
+            else {
+                regWr( rMODE, MODE_FS_HOST );       //start full-speed host
+                vbusState = FSHOST;
+            }
+            break;
+        case( bmSE1 ):              //illegal state
+            vbusState = SE1;
+            break;
+        case( bmSE0 ):              //disconnected state
+            vbusState = SE0;
+            break;
+        }//end switch( bus_sample )
+}
+/* MAX3421E initialization after power-on   */
+void MAX3421E::powerOn()
+{
+    /* Configure full-duplex SPI, interrupt pulse   */
+    regWr( rPINCTL,( bmFDUPSPI + bmINTLEVEL + bmGPXB ));    //Full-duplex SPI, level interrupt, GPX
+    if( reset() == false ) {                                //stop/start the oscillator
+        Serial.println("Error: OSCOKIRQ failed to assert");
+    }
+
+    /* configure host operation */
+    regWr( rMODE, bmDPPULLDN|bmDMPULLDN|bmHOST|bmSEPIRQ );      // set pull-downs, Host, Separate GPIN IRQ on GPX
+    regWr( rHIEN, bmCONDETIE|bmFRAMEIE );                                             //connection detection
+    /* check if device is connected */
+    regWr( rHCTL,bmSAMPLEBUS );                                             // sample USB bus
+    while(!(regRd( rHCTL ) & bmSAMPLEBUS ));                                //wait for sample operation to finish
+    busprobe();                                                             //check if anything is connected
+    regWr( rHIRQ, bmCONDETIRQ );                                            //clear connection detect interrupt                 
+    regWr( rCPUCTL, 0x01 );                                                 //enable interrupt pin
+}
+/* MAX3421 state change task and interrupt handler */
+byte MAX3421E::Task( void )
+{
+ byte rcode = 0;
+ byte pinvalue;
+    //Serial.print("Vbus state: ");
+    //Serial.println( vbusState, HEX );
+    pinvalue = digitalRead( MAX_INT );    
+    if( pinvalue  == LOW ) {
+        rcode = IntHandler();
+    }
+    pinvalue = digitalRead( MAX_GPX );
+    if( pinvalue == LOW ) {
+        GpxHandler();
+    }
+//    usbSM();                                //USB state machine                            
+    return( rcode );   
+}   
+byte MAX3421E::IntHandler()
+{
+ byte HIRQ;
+ byte HIRQ_sendback = 0x00;
+    HIRQ = regRd( rHIRQ );                  //determine interrupt source
+    //if( HIRQ & bmFRAMEIRQ ) {               //->1ms SOF interrupt handler
+    //    HIRQ_sendback |= bmFRAMEIRQ;
+    //}//end FRAMEIRQ handling
+    if( HIRQ & bmCONDETIRQ ) {
+        busprobe();
+        HIRQ_sendback |= bmCONDETIRQ;
+    }
+    /* End HIRQ interrupts handling, clear serviced IRQs    */
+    regWr( rHIRQ, HIRQ_sendback );
+    return( HIRQ_sendback );
+}
+byte MAX3421E::GpxHandler()
+{
+ byte GPINIRQ = regRd( rGPINIRQ );          //read GPIN IRQ register
+//    if( GPINIRQ & bmGPINIRQ7 ) {            //vbus overload
+//        vbusPwr( OFF );                     //attempt powercycle
+//        delay( 1000 );
+//        vbusPwr( ON );
+//        regWr( rGPINIRQ, bmGPINIRQ7 );
+//    }       
+    return( GPINIRQ );
+}
+
+//void MAX3421E::usbSM( void )                //USB state machine
+//{
+//    
+//
+//}

libs/USBHost/Max3421e.h

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+/* Copyright 2009-2011 Oleg Mazurov, Circuits At Home, http://www.circuitsathome.com */
+/* MAX3421E functions */
+#ifndef _MAX3421E_H_
+#define _MAX3421E_H_
+
+
+//#include <Spi.h>
+//#include <WProgram.h>
+#include "WProgram.h"
+#include "Max3421e_constants.h"
+
+class MAX3421E /* : public SPI */ {
+    // byte vbusState;
+    public:
+        MAX3421E( void );
+        byte getVbusState( void );
+//        void toggle( byte pin );
+        static void regWr( byte, byte );
+        char * bytesWr( byte, byte, char * );
+        static void gpioWr( byte );
+        byte regRd( byte );
+        char * bytesRd( byte, byte, char * );
+        byte gpioRd( void );
+        boolean reset();
+        boolean vbusPwr ( boolean );
+        void busprobe( void );
+        void powerOn();
+        byte IntHandler();
+        byte GpxHandler();
+        byte Task();
+    private:
+      static void spi_init() {
+        uint8_t tmp;
+        // initialize SPI pins
+        pinMode(SCK_PIN, OUTPUT);
+        pinMode(MOSI_PIN, OUTPUT);
+        pinMode(MISO_PIN, INPUT);
+        pinMode(SS_PIN, OUTPUT);
+        digitalWrite( SS_PIN, HIGH ); 
+        /* mode 00 (CPOL=0, CPHA=0) master, fclk/2. Mode 11 (CPOL=11, CPHA=11) is also supported by MAX3421E */
+        SPCR = 0x50;
+        SPSR = 0x01;
+        /**/
+        tmp = SPSR;
+        tmp = SPDR;
+    }
+//        void init();
+    friend class Max_LCD;        
+};
+
+
+
+
+#endif //_MAX3421E_H_