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BlueSCSI
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INQUIRY supports small transfer sizes now 

this fixes some Apple II SCSI cards like RAMFast and CMS
This commit is contained in:
Troy 2023-01-28 17:55:48 -05:00 committed by Eric Helgeson
parent 927f8101fa
commit ad4737f384
1 changed files with 34 additions and 1 deletions
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35
src/BlueSCSI.cpp
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@ -871,6 +871,39 @@ inline void writeHandshake(byte d)
while( SCSI_IN(vACK));
}
inline void writeHandshakeLoop(int len, const byte* srcptr)
{
LOG(" DI ");
SCSI_PHASE_CHANGE(SCSI_PHASE_DATAIN);
// Bus settle delay 400ns. Following code was measured at 800ns before REQ asserted. STM32F103.
#ifdef XCVR
TRANSCEIVER_IO_SET(vTR_DBP,TR_OUTPUT)
#endif
SCSI_DB_OUTPUT()
#define REQ_ON() (port_b->BRR = req_bit);
#define FETCH_BSRR_DB() (bsrr_val = bsrr_tbl[*srcptr++])
#define REQ_OFF_DB_SET(BSRR_VAL) port_b->BSRR = BSRR_VAL;
#define WAIT_ACK_ACTIVE() while((*port_a_idr>>(vACK&15)&1))
#define WAIT_ACK_INACTIVE() while(!(*port_a_idr>>(vACK&15)&1))
register const uint32_t *bsrr_tbl = db_bsrr; // Table to convert to BSRR
register uint32_t bsrr_val; // BSRR value to output (DB, DBP, REQ = ACTIVE)
register uint32_t req_bit = BITMASK(vREQ);
register gpio_reg_map *port_b = PBREG;
register volatile uint32_t *port_a_idr = &(GPIOA->regs->IDR);
// Start the first bus cycle.
do{
FETCH_BSRR_DB();
REQ_OFF_DB_SET(bsrr_val);
WAIT_ACK_INACTIVE();
REQ_ON();
WAIT_ACK_ACTIVE();
}while(--len);
GPIOB->regs->BSRR = DBP(0xff); // DB=0xFF , SCSI_OUT(vREQ,inactive)
WAIT_ACK_INACTIVE();
}
#pragma GCC push_options
#pragma GCC optimize ("-Os")
/*
@ -1370,7 +1403,7 @@ static byte onNOP(SCSI_DEVICE *dev, const byte *cdb)
*/
byte onInquiry(SCSI_DEVICE *dev, const byte *cdb)
{
writeDataPhase(cdb[4] < 47 ? cdb[4] : 47, dev->inquiry_block.raw);
writeHandshakeLoop(cdb[4] < 47 ? cdb[4] : 47, dev->inquiry_block.raw);
return SCSI_STATUS_GOOD;
}