workbench/devs/midi/debugdriver.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: English
   7 */
   8
   9
  10
  11 /*********************************************************************************
  12   Not a very good example at all. But at least it should prove that
  13   AROS is able to use camd-drivers. -Kjetil M.
  14
  15   Compiling it up is easy. Its just like any other AROS-program, showed
  16   by this makefile:
  17
  18 "
  19 debugdriver: debugdriver.o
  20     gcc -nostartfiles -nostdlib -Xlinker -i ../../lib/startup.o debugdriver.o -o debugdriver -L../../lib -larossupport -lamiga -larosc -larosm
  21
  22 debugdriver.o: debugdriver.c makefile
  23     gcc debugdriver.c -c -I../../Include -Wall
  24 "
  25
  26 ***********************************************************************************/
  27
  28
  29 #include <proto/exec.h>
  30 #include <exec/types.h>
  31 #include <midi/camddevices.h>
  32 #include <libcore/compiler.h>
  33
  34 #define NUMPORTS 4
  35
  36 struct ExecBase *SysBase;
  37
  38
  39 int main(void){
  40   /* A camd mididriver is not supposed to be run directly, so we return an error. */
  41   return -1;
  42 }
  43
  44
  45
  46 /*    Prototypes    */
  47
  48 extern void kprintf(char *bla,...);
  49
  50 BOOL ASM Init(REG(a6) APTR sysbase);
  51 void Expunge(void);
  52 SAVEDS ASM struct MidiPortData *OpenPort(
  53                                          REG(a3) struct MidiDeviceData *data,
  54                                          REG(d0) LONG portnum,
  55                                          REG(a0) ULONG (* ASM transmitfunc)(APTR REG(a2) userdata),
  56                                          REG(a1) void (* ASM recievefunc)(UWORD REG(d0) input,APTR REG(a2) userdata),
  57                                          REG(a2) APTR userdata
  58                                          );
  59 ASM void ClosePort(
  60                    REG(a3) struct MidiDeviceData *data,
  61                    REG(d0) LONG portnum
  62                    );
  63
  64 /*   End prototypes  */
  65
  66
  67
  68 /***********************************************************************
  69    The mididevicedata struct.
  70    Note. It doesn't have to be declared with the const qualifier, since
  71    NPorts may be set at Init. You should set the name-field to the
  72    same as the filename, that might be a demand...
  73 ***********************************************************************/
  74 const struct MidiDeviceData mididevicedata={
  75   MDD_Magic,
  76   "debugdriver",
  77   "Debugdriver V41.0 (c) 2001 AROS - The AROS Research OS",
  78   41,
  79   0,
  80   Init,
  81   Expunge,
  82   OpenPort,
  83   ClosePort,
  84   NUMPORTS,
  85   1
  86 };
  87
  88 /****************************************************************
  89    We only store sysbase, thats all we need in this example.
  90    Otherwise, you may want to open libraries, set number of
  91    ports, obtain interrupts, etc.
  92  ***************************************************************/
  93 SAVEDS ASM BOOL Init(REG(a6) APTR sysbase){
  94   SysBase=sysbase;
  95   return TRUE;
  96 }
  97
  98 /****************************************************************
  99    Nothing to do here. Normally, you may want to free memory,
 100    close some libraries, free some interrupts, etc.
 101 *****************************************************************/
 102 void Expunge(void){
 103   return;
 104 }
 105
 106
 107
 108 ULONG (ASM *TransmitFunc)(REG(a2) APTR userdata);
 109 APTR UserData[NUMPORTS];
 110
 111
 112
 113 /****************************************************************
 114    Normally, you may want to start an interrupt, or signal another task,
 115    or send a message to a port, that calls the transmit-function.
 116    But for this small example, sending the signal directly via
 117    kprintf is excactly what we want to do.
 118 ****************************************************************/
 119 SAVEDS ASM void ActivateXmit(REG(a2) APTR userdata,ULONG REG(d0) portnum){
 120   ULONG data;
 121   for(;;){
 122
 123     data=(TransmitFunc)(userdata);
 124
 125     if(data==0x100) return;
 126     kprintf("Debugdriver has received: %lx at port %ld\n",data,portnum);
 127   }
 128 }
 129
 130 struct MidiPortData midiportdata={
 131   ActivateXmit
 132 };
 133
 134
 135 /****************************************************************
 136    This one is called whenever a program that has opened
 137    camd.library wants to use your services.
 138 ****************************************************************/
 139 SAVEDS ASM struct MidiPortData *OpenPort(
 140                                          REG(a3) struct MidiDeviceData *data,
 141                                          REG(d0) LONG portnum,
 142                                          REG(a0) ULONG (* ASM transmitfunc)(APTR REG(a2) userdata),
 143                                          REG(a1) void (* ASM recieverfunc)(UWORD REG(d0) input,APTR REG(a2) userdata),
 144                                          REG(a2) APTR userdata
 145                                          ){
 146   /* We haven't got any receiver function, so we don't bother about storing the receiverfunc variable. */
 147
 148   TransmitFunc=transmitfunc;
 149   UserData[portnum-1]=userdata;
 150   return &midiportdata;
 151 }
 152
 153
 154
 155 /****************************************************************
 156    Nothing to do here. Normally, you may want to free memory,
 157    mark the port not to be in use anymore, delete a task, etc.
 158 *****************************************************************/
 159 ASM void ClosePort(
 160                    REG(a3) struct MidiDeviceData *data,
 161                    REG(d0) LONG portnum
 162                    ){
 163   return;
 164 }
 165