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Annotation of nono/vm/printer.cpp, revision 1.1.1.9

1.1       root        1: //
                      2: // nono
1.1.1.2   root        3: // Copyright (C) 2020 nono project
                      4: // Licensed under nono-license.txt
1.1       root        5: //
                      6: 
1.1.1.6   root        7: //
                      8: // プリンタポート
                      9: //
                     10: 
1.1       root       11: #include "printer.h"
1.1.1.3   root       12: #include "mpu.h"
1.1       root       13: 
1.1.1.9 ! root       14: // InsideOut p.135
        !            15: static const busdata wait = busdata::Wait(7 * 40_nsec);
        !            16: 
1.1.1.6   root       17: // コンストラクタ
1.1       root       18: PrinterDevice::PrinterDevice()
1.1.1.8   root       19:        : inherited(OBJ_PRINTER)
1.1       root       20: {
                     21: }
                     22: 
1.1.1.6   root       23: // デストラクタ
1.1       root       24: PrinterDevice::~PrinterDevice()
                     25: {
                     26: }
                     27: 
1.1.1.9 ! root       28: busdata
1.1       root       29: PrinterDevice::Read8(uint32 addr)
                     30: {
                     31:        // 書き込み専用
1.1.1.9 ! root       32:        busdata data = busdata::BusErr;
        !            33:        data |= wait;
        !            34:        return data;
1.1       root       35: }
                     36: 
1.1.1.9 ! root       37: busdata
1.1       root       38: PrinterDevice::Read16(uint32 addr)
                     39: {
                     40:        // 書き込み専用
1.1.1.9 ! root       41:        busdata data = busdata::BusErr;
        !            42:        data |= wait;
        !            43:        return data;
1.1       root       44: }
                     45: 
1.1.1.9 ! root       46: busdata
1.1       root       47: PrinterDevice::Write8(uint32 addr, uint32 data)
                     48: {
                     49:        uint32 offset = addr - baseaddr;
1.1.1.9 ! root       50:        busdata r;
        !            51: 
1.1       root       52:        switch (offset) {
                     53:         case 0:
1.1.1.7   root       54:                // データ書き込み
                     55:                putlog(0, "Write Data (NOT IMPLEMENTED)");
1.1.1.9 ! root       56:                r.SetBusErr();
1.1       root       57:                break;
                     58:         case 3:
1.1.1.7   root       59:                // ストローブ書き込み
                     60:                putlog(0, "Write Strobe (NOT IMPLEMENTED)");
1.1.1.9 ! root       61:                r = 0;
        !            62:                break;
1.1       root       63:         default:
                     64:                break;
                     65:        }
1.1.1.9 ! root       66: 
        !            67:        r |= wait;
        !            68:        return r;
1.1       root       69: }
                     70: 
1.1.1.9 ! root       71: busdata
1.1       root       72: PrinterDevice::Write16(uint32 addr, uint32 data)
                     73: {
                     74:        return Write8(addr + 1, data);
                     75: }
                     76: 
1.1.1.9 ! root       77: busdata
1.1       root       78: PrinterDevice::Peek8(uint32 addr)
                     79: {
                     80:        // XXX
                     81:        return 0xff;
                     82: }

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