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SWIM3: implement disk reading.

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This commit is contained in:
Maxim Poliakovski 2022-02-15 15:55:16 +01:00
parent 579a56f749
commit 2ce2cae48c
2 changed files with 30 additions and 3 deletions
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32
devices/floppy/swim3.cpp
View File

@ -262,12 +262,18 @@ void Swim3Ctrl::start_disk_access()
} }
this->mode_reg |= SWIM3_GO; this->mode_reg |= SWIM3_GO;
LOG_F(INFO, "SWIM3: disk access started!"); LOG_F(9, "SWIM3: disk access started!");
if (this->first_sec == 0xFF) { if (this->first_sec == 0xFF) {
// $FF means no sector to match -> // $FF means no sector to match ->
// generate ID_read interrups as long as the GO bit is set // generate ID_read interrups as long as the GO bit is set
this->int_drive->init_track_search(-1); // start at random sector this->int_drive->init_track_search(-1); // start at random sector
} else {
this->cur_sector = this->first_sec;
}
// HACK: figure out from bits in int_mask register which kind of disk access is requested
if (this->int_mask & INT_ID_READ) { // read address header
this->access_timer_id = TimerManager::get_instance()->add_cyclic_timer( this->access_timer_id = TimerManager::get_instance()->add_cyclic_timer(
static_cast<uint64_t>(this->int_drive->get_sector_delay() * NS_PER_SEC + 0.5f), static_cast<uint64_t>(this->int_drive->get_sector_delay() * NS_PER_SEC + 0.5f),
[this]() { [this]() {
@ -282,8 +288,28 @@ void Swim3Ctrl::start_disk_access()
update_irq(); update_irq();
} }
); );
} else { } else { // otherwise, read sector data
LOG_F(ERROR, "SWIM3: unsupported first_sec value 0x%X", this->first_sec); this->access_timer_id = TimerManager::get_instance()->add_cyclic_timer(
static_cast<uint64_t>(this->int_drive->get_sector_delay() * NS_PER_SEC + 0.5f),
[this]() {
// transfer sector data over DMA
this->dma_ch->push_data(this->int_drive->get_sector_data_ptr(this->cur_sector), 512);
// get next address field
MacSuperdrive::SectorHdr addr = this->int_drive->next_sector_header();
// set up the corresponding SWIM3 registers
this->cur_track = ((addr.side & 1) << 7) | (addr.track & 0x7F);
this->cur_sector = 0x80 /* CRC/checksum valid */ | (addr.sector & 0x7F);
this->format = addr.format;
if (--this->xfer_cnt == 0) {
this->stop_disk_access();
// generate sector_done interrupt
this->int_flags |= INT_SECT_DONE;
update_irq();
}
}
);
} }
} }

1
devices/floppy/swim3.h
View File

@ -66,6 +66,7 @@ enum {
enum { enum {
INT_STEP_DONE = 0x02, INT_STEP_DONE = 0x02,
INT_ID_READ = 0x04, INT_ID_READ = 0x04,
INT_SECT_DONE = 0x08,
}; };
class Swim3Ctrl : public HWComponent { class Swim3Ctrl : public HWComponent {