lib/gpif.c

   1 /**
   2  * Copyright (C) 2008 Ubixum, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17  **/
  18
  19
  20 #include <fx2regs.h>
  21 #include <fx2macros.h>
  22 #include <delay.h>
  23
  24 #include <gpif.h>
  25
  26 #define SYNCDELAY() SYNCDELAY4
  27
  28 void gpif_init( BYTE* wavedata, BYTE* initdata ) {
  29
  30     BYTE i;
  31
  32   // Registers which require a synchronization delay, see section 15.14
  33   // FIFORESET        FIFOPINPOLAR
  34   // INPKTEND         OUTPKTEND
  35   // EPxBCH:L         REVCTL
  36   // GPIFTCB3         GPIFTCB2
  37   // GPIFTCB1         GPIFTCB0
  38   // EPxFIFOPFH:L     EPxAUTOINLENH:L
  39   // EPxFIFOCFG       EPxGPIFFLGSEL
  40   // PINFLAGSxx       EPxFIFOIRQ
  41   // EPxFIFOIE        GPIFIRQ
  42   // GPIFIE           GPIFADRH:L
  43   // UDMACRCH:L       EPxGPIFTRIG
  44   // GPIFTRIG
  45
  46   // Note: The pre-REVE EPxGPIFTCH/L register are affected, as well...
  47   //      ...these have been replaced by GPIFTC[B3:B0] registers
  48
  49   // 8051 doesn't have access to waveform memories 'til
  50   // the part is in GPIF mode.
  51
  52   // IFCLKSRC=1   , FIFOs executes on internal clk source
  53   // xMHz=1       , 48MHz internal clk rate
  54   // IFCLKOE=0    , Don't drive IFCLK pin signal at 48MHz
  55   // IFCLKPOL=0   , Don't invert IFCLK pin signal from internal clk
  56   // ASYNC=1      , master samples asynchronous
  57   // GSTATE=1     , Drive GPIF states out on PORTE[2:0], debug WF
  58   // IFCFG[1:0]=10, FX2 in GPIF master mode  IFCONFIG
  59   IFCONFIG &= ~0x03; // turn off IFCFG[1:0]
  60   IFCONFIG |= 0x02; // set's IFCFG[1:0] to 10 to put in GPIF master mode.
  61
  62
  63   GPIFABORT = 0xFF;  // abort any waveforms pending
  64
  65   GPIFREADYCFG = initdata[ 0 ];
  66   GPIFCTLCFG = initdata[ 1 ];
  67   GPIFIDLECS = initdata[ 2 ];
  68   GPIFIDLECTL = initdata[ 3 ];
  69   GPIFWFSELECT = initdata[ 5 ];
  70   GPIFREADYSTAT = initdata[ 6 ];
  71
  72   // use dual autopointer feature...
  73   AUTOPTRSETUP = 0x07;          // inc both pointers,
  74                                 // ...warning: this introduces pdata hole(s)
  75                                 // ...at E67B (XAUTODAT1) and E67C (XAUTODAT2)
  76
  77   // source
  78   AUTOPTRH1 = MSB( (WORD)wavedata );
  79   AUTOPTRL1 = LSB( (WORD)wavedata );
  80
  81   // destination
  82   AUTOPTRH2 = 0xE4;
  83   AUTOPTRL2 = 0x00;
  84
  85   // transfer
  86   for ( i = 0x00; i < 128; i++ )
  87   {
  88     EXTAUTODAT2 = EXTAUTODAT1;
  89   }
  90
  91 // Configure GPIF Address pins, output initial value,
  92 // these instructions don't do anything on the
  93 // smaller chips (e.g., 56 pin model only has ports a,b,d)
  94   PORTCCFG = 0xFF;    // [7:0] as alt. func. GPIFADR[7:0]
  95   OEC = 0xFF;         // and as outputs
  96   PORTECFG |= 0x80;   // [8] as alt. func. GPIFADR[8]
  97   OEE |= 0x80;        // and as output
  98
  99 // ...OR... tri-state GPIFADR[8:0] pins
 100 //  PORTCCFG = 0x00;  // [7:0] as port I/O
 101 //  OEC = 0x00;       // and as inputs
 102 //  PORTECFG &= 0x7F; // [8] as port I/O
 103 //  OEE &= 0x7F;      // and as input
 104
 105 // GPIF address pins update when GPIFADRH/L written
 106   SYNCDELAY();                    //
 107   GPIFADRH = 0x00;    // bits[7:1] always 0
 108   SYNCDELAY();                    //
 109   GPIFADRL = 0x00;    // point to PERIPHERAL address 0x0000
 110
 111 // set the initial flowstates to be all 0 in case flow states are not used
 112
 113   FLOWSTATE = 0;
 114   FLOWLOGIC = 0;
 115   FLOWEQ0CTL = 0;
 116   FLOWEQ1CTL = 0;
 117   FLOWHOLDOFF = 0;
 118   FLOWSTB = 0;
 119   FLOWSTBEDGE = 0;
 120   FLOWSTBHPERIOD = 0;
 121 }
 122
 123 void gpif_setflowstate( BYTE* flowstates, BYTE bank) {
 124   BYTE base = 9*bank;
 125   FLOWSTATE = flowstates[ base ];
 126   FLOWLOGIC = flowstates[ base+1 ];
 127   FLOWEQ0CTL = flowstates[ base+2 ];
 128   FLOWEQ1CTL = flowstates[ base+3 ];
 129   FLOWHOLDOFF = flowstates[ base+4 ];
 130   FLOWSTB = flowstates[ base+5 ];
 131   FLOWSTBEDGE = flowstates[ base+6 ];
 132   FLOWSTBHPERIOD = flowstates[ base+7 ];
 133 }
 134
 135 void gpif_set_tc(DWORD tc) {
 136     GPIFTCB3 = MSB(MSW(tc));
 137     SYNCDELAY();
 138     GPIFTCB2 = LSB(MSW(tc));
 139     SYNCDELAY();
 140     GPIFTCB1 = MSB(LSW(tc));
 141     SYNCDELAY();
 142     GPIFTCB0 = LSB(LSW(tc));
 143 }
 144
 145 void gpif_single_read16( WORD* res, WORD len ){
 146     BYTE c;
 147     while (!(GPIFTRIG & 0x80)); // wait done
 148     // dummy read to trigger real read
 149     res[0] = XGPIFSGLDATLX;
 150     for (c=0;c<len;++c) {
 151      while ( !(GPIFTRIG & 0x80) ); // wait done
 152      // real read
 153      // whether or not to do another transfer is controlled by GPIFSGLDATLNOX or ..DATLX
 154      res[c] = MAKEWORD(GPIFSGLDATH, c==len-1 ? GPIFSGLDATLNOX : GPIFSGLDATLX );
 155     }
 156 }
 157
 158 void gpif_single_write16( WORD* dat, WORD len) {
 159    BYTE c;
 160    for (c=0;c<len;++c) {
 161     while (!(GPIFTRIG & 0x80) );
 162     XGPIFSGLDATH = MSB(dat[c]);
 163     XGPIFSGLDATLX = LSB(dat[c]);
 164    }
 165 }
 166
 167 void gpif_fifo_read ( GPIF_EP_NUM ep_num ) {
 168     while ( !(GPIFTRIG & 0x80 ) ); // wait until things are finished
 169     GPIFTRIG = GPIFTRGRD | ep_num;
 170 }
 171
 172 void gpif_fifo_write ( GPIF_EP_NUM ep_num ) {
 173     while ( !(GPIFTRIG & 0x80) ); // wait until things are finished
 174     GPIFTRIG = ep_num; // R/W=0, E[1:0] = ep_num
 175 }