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https://github.com/TomHarte/CLK.git
synced 2024-07-09 21:29:53 +00:00
Factored out the dull and repetitious stuff of writing n bytes of the same value.
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d7bed958b3
commit
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@ -428,19 +428,11 @@ void i8272::posit_event(int event_type) {
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begin_writing();
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begin_writing();
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if(get_is_double_density()) {
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if(get_is_double_density()) {
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for(int c = 0; c < 50; c++) {
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write_n_bytes(50, 0x4e);
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write_byte(0x4e);
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write_n_bytes(12, 0x00);
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}
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for(int c = 0; c < 12; c++) {
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write_byte(0x00);
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}
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} else {
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} else {
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for(int c = 0; c < 11; c++) {
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write_n_bytes(11, 0xff);
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write_byte(0xff);
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write_n_bytes(6, 0x00);
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}
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for(int c = 0; c < 6; c++) {
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write_byte(0x00);
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}
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}
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}
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WAIT_FOR_EVENT(Event::DataWritten);
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WAIT_FOR_EVENT(Event::DataWritten);
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@ -572,28 +564,28 @@ void i8272::posit_event(int event_type) {
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// Write start-of-track.
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// Write start-of-track.
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if(get_is_double_density()) {
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if(get_is_double_density()) {
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for(int c = 0; c < 80; c++) write_byte(0x4e);
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write_n_bytes(80, 0x4e);
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for(int c = 0; c < 12; c++) write_byte(0x00);
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write_n_bytes(12, 0x00);
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for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMIndexSync);
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for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMIndexSync);
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write_byte(Storage::Encodings::MFM::IndexAddressByte);
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write_byte(Storage::Encodings::MFM::IndexAddressByte);
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for(int c = 0; c < 50; c++) write_byte(0x4e);
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write_n_bytes(50, 0x4e);
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} else {
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} else {
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for(int c = 0; c < 40; c++) write_byte(0xff);
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write_n_bytes(40, 0xff);
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for(int c = 0; c < 6; c++) write_byte(0x00);
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write_n_bytes(6, 0x00);
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write_raw_short(Storage::Encodings::MFM::FMIndexAddressMark);
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write_raw_short(Storage::Encodings::MFM::FMIndexAddressMark);
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for(int c = 0; c < 26; c++) write_byte(0xff);
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write_n_bytes(26, 0xff);
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}
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}
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WAIT_FOR_EVENT(Event::DataWritten);
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WAIT_FOR_EVENT(Event::DataWritten);
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sector_ = 0;
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sector_ = 0;
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format_track_write_sector:
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format_track_write_sector:
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if(get_is_double_density()) {
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if(get_is_double_density()) {
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for(int c = 0; c < 12; c++) write_byte(0x00);
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write_n_bytes(12, 0x00);
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for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
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for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
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get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
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get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
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write_byte(Storage::Encodings::MFM::IDAddressByte);
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write_byte(Storage::Encodings::MFM::IDAddressByte);
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} else {
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} else {
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for(int c = 0; c < 6; c++) write_byte(0x00);
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write_n_bytes(6, 0x00);
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get_crc_generator().reset();
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get_crc_generator().reset();
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write_raw_short(Storage::Encodings::MFM::FMIDAddressMark);
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write_raw_short(Storage::Encodings::MFM::FMIDAddressMark);
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}
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}
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@ -619,28 +611,22 @@ void i8272::posit_event(int event_type) {
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// Write the sector body.
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// Write the sector body.
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if(get_is_double_density()) {
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if(get_is_double_density()) {
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for(int c = 0; c < 22; c++) write_byte(0x4e);
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write_n_bytes(22, 0x4e);
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for(int c = 0; c < 12; c++) write_byte(0x00);
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write_n_bytes(12, 0x00);
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for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
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for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
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get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
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get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
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write_byte(Storage::Encodings::MFM::DataAddressByte);
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write_byte(Storage::Encodings::MFM::DataAddressByte);
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} else {
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} else {
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for(int c = 0; c < 11; c++) write_byte(0xff);
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write_n_bytes(11, 0xff);
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for(int c = 0; c < 6; c++) write_byte(0x00);
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write_n_bytes(6, 0x00);
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get_crc_generator().reset();
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get_crc_generator().reset();
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write_raw_short(Storage::Encodings::MFM::FMDataAddressMark);
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write_raw_short(Storage::Encodings::MFM::FMDataAddressMark);
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}
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}
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for(int c = 0; c < (128 << command_[2]); c++) {
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write_n_bytes(128 << command_[2], command_[5]);
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write_byte(command_[5]);
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}
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write_crc();
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write_crc();
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// Write the prescribed gap.
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// Write the prescribed gap.
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if(get_is_double_density()) {
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write_n_bytes(command_[4], get_is_double_density() ? 0x4e : 0xff);
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for(int c = 0; c < command_[4]; c++) write_byte(0x4e);
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} else {
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for(int c = 0; c < command_[4]; c++) write_byte(0xff);
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}
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// Consider repeating.
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// Consider repeating.
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sector_++;
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sector_++;
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@ -181,3 +181,7 @@ void MFMController::write_crc() {
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write_byte(crc >> 8);
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write_byte(crc >> 8);
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write_byte(crc & 0xff);
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write_byte(crc & 0xff);
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}
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}
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void MFMController::write_n_bytes(int quantity, uint8_t value) {
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while(quantity--) write_byte(value);
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}
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@ -113,6 +113,11 @@ class MFMController: public Controller {
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*/
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*/
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void write_crc();
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void write_crc();
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/*!
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Calls @c write_byte with @c value, @c quantity times.
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*/
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void write_n_bytes(int quantity, uint8_t value);
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private:
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private:
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// Storage::Disk::Controller
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// Storage::Disk::Controller
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virtual void process_input_bit(int value, unsigned int cycles_since_index_hole);
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virtual void process_input_bit(int value, unsigned int cycles_since_index_hole);
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