64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
#include "global.h"
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#define BLOCKSIZE 32
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s32 __osPfsLastChannel = -1;
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s32 __osContRamRead(OSMesgQueue* ctrlrqueue, s32 channel, u16 addr, u8* data) {
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s32 ret;
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s32 i;
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u8* bufptr;
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s32 retryCount = 2;
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__osSiGetAccess();
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do {
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bufptr = (u8*)&gPifMempakBuf;
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if ((__osContLastPoll != 2) || (__osPfsLastChannel != channel)) {
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__osContLastPoll = 2;
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__osPfsLastChannel = channel;
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// clang-format off
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for (i = 0; i < channel; i++) { *bufptr++ = 0; }
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// clang-format on
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gPifMempakBuf.status = 1;
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((__OSContRamHeader*)bufptr)->unk_00 = 0xFF;
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((__OSContRamHeader*)bufptr)->txsize = 3;
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((__OSContRamHeader*)bufptr)->rxsize = 0x21;
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((__OSContRamHeader*)bufptr)->poll = CONT_CMD_READ_MEMPACK; // read mempak; send byte 0
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((__OSContRamHeader*)bufptr)->datacrc = 0xFF; // read mempak; send byte 0
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// Received bytes are 6-26 inclusive
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bufptr[sizeof(__OSContRamHeader)] = CONT_CMD_END; // End of commands
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} else {
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bufptr += channel;
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}
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((__OSContRamHeader*)bufptr)->hi = addr >> 3; // send byte 1
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((__OSContRamHeader*)bufptr)->lo = (s8)(__osContAddressCrc(addr) | (addr << 5)); // send byte 2
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__osSiRawStartDma(OS_WRITE, &gPifMempakBuf);
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osRecvMesg(ctrlrqueue, NULL, OS_MESG_BLOCK);
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__osSiRawStartDma(OS_READ, &gPifMempakBuf);
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osRecvMesg(ctrlrqueue, NULL, OS_MESG_BLOCK);
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ret = (((__OSContRamHeader*)bufptr)->rxsize & 0xC0) >> 4;
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if (!ret) {
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if (((__OSContRamHeader*)bufptr)->datacrc != __osContDataCrc(bufptr + 6)) {
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ret = __osPfsGetStatus(ctrlrqueue, channel);
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if (ret) {
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break;
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}
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ret = 4; // Retry
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} else {
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bcopy(bufptr + 6, data, BLOCKSIZE);
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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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}
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} while (0 <= retryCount--);
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__osSiRelAccess();
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return ret;
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}
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