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58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
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#include <ultra64.h>
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#include <global.h>
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#include <ultra64/controller.h>
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s32 osReadMempak(OSMesgQueue* ctrlrqueue, s32 ctrlridx, u16 addr, PIF_mempak_data_t* data) {
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s32 ret;
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s32 i;
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u8* bufptr;
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s32 read_try_count = 2;
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__osSiGetAccess();
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do {
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if ((_osCont_lastPollType != 2) || (ctrlridx != D_80134D20)) {
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bufptr = &pifMempakBuf.bytes[0];
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_osCont_lastPollType = 2;
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D_80134D20 = ctrlridx;
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// clang-format off
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// NOLINTNEXTLINE
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for (i = 0; i < ctrlridx; i++) *bufptr++ = 0;
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// clang-format on
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pifMempakBuf.status_control = 1;
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((PIF_header_t*)bufptr)->slot_type = 0xff;
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((PIF_header_t*)bufptr)->bytes_send = 3;
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((PIF_header_t*)bufptr)->status_hi_bytes_rec_lo = 0x21;
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((PIF_header_t*)bufptr)->command = 2; // read mempak; send byte 0
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// Received bytes are 6-26 inclusive
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bufptr[0x26] = 0xff; // last byte of receive
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bufptr[0x27] = 0xfe; // End of commands
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} else {
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bufptr = &pifMempakBuf.bytes[ctrlridx];
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}
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bufptr[4] = addr >> 3; // send byte 1
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bufptr[5] = (s8)(osMempakAddrCRC(addr) | (addr << 5)); // send byte 2
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__osSiRawStartDma(1, &pifMempakBuf);
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osRecvMesg(ctrlrqueue, 0, 1);
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__osSiRawStartDma(0, &pifMempakBuf);
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osRecvMesg(ctrlrqueue, 0, 1);
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ret = (((PIF_header_t*)bufptr)->status_hi_bytes_rec_lo & 0xc0) >> 4;
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if (!ret) {
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if (bufptr[0x26] != osMempakDataCRC(bufptr + 6)) {
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ret = func_80101910(ctrlrqueue, ctrlridx);
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if (ret)
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break;
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ret = 4; // Retry
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} else {
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bcopy(bufptr + 6, data, 0x20);
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}
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} else {
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ret = 1; // Error
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}
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if (ret != 4)
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break;
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} while (0 <= read_try_count--);
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__osSiRelAccess();
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return ret;
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}
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