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DACS: Mixer Driver Code, mixdrv.c | 
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Next: Pbus Driver Defines, pbusdefn.h Up: Mixer Unit Previous: Mixer Driver Header, mixdrv.h Contents Mixer Driver Code, mixdrv.cThe following code provides the necessary underlying functionality to access the hardware of the mixer unit.
/*****************************************************************************
* DACS : Distributed Audio Control System
*============================================================================
* File: mixdrv.c
* Author: Stephen S. Richardson
* Date Created: 04.14.97
* Environment: ICC11 v4.0, 68HC11 target
* Build: library, not standalone
*============================================================================
* The code, executables, documentation, firmware images, and all related
* material of DACS are
* Copyright (C) 1997 Stephen S. Richardson - ALL RIGHTS RESERVED
*****************************************************************************
* Source code control:
*
* $Id: mixdrv.c,v 1.1 1997/07/13 01:22:41 prefect Exp prefect $
*
*****************************************************************************/
#include <hc11.h>
#include "pbusdefn.h"
#include "mixdrv.h"
#include "build.h"
#include "lcddefn.h"
#include "stdlcd.h"
#include "serno.h"
#include "romtext.h"
#include "ACIAserial.h"
/*****************************************************************************
* mix_get_system_config
*
* dynamically acquire the system configuration of the mixer unit by polling
* for cards
*
* TODO: make this dynamic and not hardcoded.
*****************************************************************************/
void mix_get_system_config (void)
{
int i;
unit.id=0; /* this needs to be set by the host */
strcpy (unit.serno, UNIT_SERNO);
strcpy (unit.ver, build_info);
unit.mix_brd[0]=MIX_2163x4;
unit.mix_brd[1]=MIX_2163x4;
unit.mix_brd[2]=MIX_2163x4;
unit.mix_brd[3]=MIX_2163x4;
for (i=4;i<MAXMIXBRDS;i++) unit.mix_brd[i]=NO_BRD;
unit.mix_brds=4;
unit.inp_brd[0]=IN_ANALOG8;
unit.inp_brd[1]=IN_ANALOG8;
unit.inp_brd[2]=IN_ANALOG8;
unit.inp_brd[3]=IN_ANALOG8;
unit.inp_brds=4;
unit.out_brd[0]=OUT_ANALOG8;
unit.out_brd[1]=OUT_ANALOG8;
unit.out_brds=2;
unit.opt_brd[0]=OPT_BUSCOMB;
unit.opt_brd[1]=NO_BRD;
unit.opt_brds=1;
}
/*****************************************************************************
* mix_system_init
*
* initialize the mixer hardware
*****************************************************************************/
void mix_system_init (void)
{
int i,d, brd;
int hitachi_init[]=HITACHI40x2_INIT;
unsigned char module,ch;
stdlcd_init(HITACHI40x2, hitachi_init); /* init 40x2 LCD */
stdlcd_out(HITACHI40x2, (char *) lcdmsg_intro); /* put up intro */
ACIA_init(); /* initialize the ACIA subsystem */
pbus_init(); /* initialize pBUS controller */
PBC_PC^=0x08;
mix_get_system_config(); /* poll the hardware and obtain config */
mix_reset_mixers(); /* reset all mixers to max. attenuation */
/* reset option boards */
for (i=0;i<MAXOPTBRDS;i++) {
switch (unit.opt_brd[i]) {
case OPT_BUSCOMB:
mix_reset_buscomb(); /* reset the bus combiner board */
break;
case OPT_VU:
mix_reset_vu(); /* reset digital vu board */
break;
}
}
PBC_PC&=~0x08;
/* wait around, and make the link LED green/black alternating */
for (d=0;d<40000;d++) {
PBC_PC^=0x04;
PBC_PC&=~0x04;
}
stdlcd_clrhome(HITACHI40x2); /* clear/home the LCD */
}
/*****************************************************************************
* mix_reset_mixers
*
* resets all of the mixer chips to maximum attenuation
*****************************************************************************/
void mix_reset_mixers (void)
{
int module, ch, p;
/* turns on all mixer channels to maximum attenuation */
for (module=0;module<4;module++) {
for (ch=0;ch<8;ch++) {
p=0x98+ch;
pbus_mwrite (PBADX_MIX0+module, p, p, p, p, CHIPALL);
pbus_mwrite (PBADX_MIX0+module, 63, 63, 63, 63, CHIPALL);
}
}
}
/*****************************************************************************
* mix_reset_buscomb
*
* resets the bus combiner module
*****************************************************************************/
void mix_reset_buscomb (void)
{
pbus_lwrite (PBADX_BCOMB,0x04+0x08+0x10); /* turn off relays */
}
/*****************************************************************************
* mix_reset_vu
*
* resets digital vu module
*****************************************************************************/
void mix_reset_vu (void)
{
/* not currently implemented in hw */
}
/*****************************************************************************
* pbus_mwrite
*
* writes to a DACS mixer module containing 4 SSM2163 mixer chips.
*
* four separate bytes are blasted in a parallel bitbanged-serial scheme.
*
*****************************************************************************/
void pbus_mwrite (unsigned char addx, unsigned char data0,
unsigned char data1, unsigned char data2,
unsigned char data3, unsigned char mask)
{
unsigned char i;
unsigned char dslice;
unsigned char bitmask_msb[]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
PBC_PA=0xAA; /* mix chips ld-/wr- inact */
PBC_PC|=PB_N_LATCH|PB_N_CLOCK; /* pBUS latch- and clock- inactive */
PBC_PB=addx|PB_N_RD_WR; /* addx on pBUS, write mode */
PBC_PC&=~PB_N_LATCH; /* pBUS latch- active */
for (i=0;i<8;i++) {
dslice = (((data0&bitmask_msb[i])<<i)>>7)|
(((data1&bitmask_msb[i])<<i)>>5)|
(((data2&bitmask_msb[i])<<i)>>3)|
(((data3&bitmask_msb[i])<<i)>>1);
dslice |= mask;
PBC_PC&=~PB_N_CLOCK; /* pBUS clock- active */
PBC_PA=dslice; /* data slice on pBUS */
PBC_PC|=PB_N_CLOCK; /* pBUS clock- inactive */
}
PBC_PA=0xAA; /* mix chips ld-/wr- inact */
PBC_PC|=PB_N_LATCH; /* pBUS latch- inactive */
}
Steve Richardson 2000-07-06 |
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