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https://github.com/TomHarte/CLK.git
synced 2024-12-23 20:29:42 +00:00
Made an honest attempt at outputting turbo speed data block data. The CPC now at least starts to load.
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@ -177,21 +177,42 @@ void TZX::get_standard_speed_data_block() {
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}
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void TZX::get_turbo_speed_data_block() {
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__unused uint16_t length_of_pilot_pulse = fgetc16le();
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__unused uint16_t length_of_sync_first_pulse = fgetc16le();
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__unused uint16_t length_of_sync_second_pulse = fgetc16le();
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__unused uint16_t length_of_zero_bit_pulse = fgetc16le();
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__unused uint16_t length_of_one_bit_pulse = fgetc16le();
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__unused uint16_t length_of_pilot_tone = fgetc16le();
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__unused uint8_t number_of_bits_in_final_byte = (uint8_t)fgetc(file_);
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__unused uint16_t pause_after_block = fgetc16le();
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uint16_t length_of_pilot_pulse = fgetc16le();
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uint16_t length_of_sync_first_pulse = fgetc16le();
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uint16_t length_of_sync_second_pulse = fgetc16le();
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uint16_t length_of_zero_bit_pulse = fgetc16le();
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uint16_t length_of_one_bit_pulse = fgetc16le();
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uint16_t length_of_pilot_tone = fgetc16le();
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uint8_t number_of_bits_in_final_byte = (uint8_t)fgetc(file_);
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uint16_t pause_after_block = fgetc16le();
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long data_length = fgetc16le();
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data_length |= (long)(fgetc(file_) << 16);
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printf("Skipping %lu bytes of turbo speed data\n", data_length);
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// Output pilot tone.
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while(length_of_pilot_tone--) {
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post_pulse(length_of_pilot_pulse);
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}
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// TODO output as described
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fseek(file_, data_length, SEEK_CUR);
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// Output sync pulses.
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post_pulse(length_of_sync_first_pulse);
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post_pulse(length_of_sync_second_pulse);
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// Output data.
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while(data_length--) {
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uint8_t next_byte = (uint8_t)fgetc(file_);
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int c = data_length ? 8 : number_of_bits_in_final_byte;
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while(c--) {
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uint16_t pulse_length = (next_byte & 0x80) ? length_of_one_bit_pulse : length_of_zero_bit_pulse;
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next_byte <<= 1;
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post_pulse(pulse_length);
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post_pulse(pulse_length);
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}
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}
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// Output gap.
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post_gap(pause_after_block);
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}
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void TZX::get_pure_tone_data_block() {
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