contramread OK (#577)

* contramread OK * Review
2026-06-19 01:20:08 -07:00 · 2022-01-30 15:52:19 -03:00
parent e4010be70c
commit 7879b49785
4 changed files with 63 additions and 4 deletions
@@ -1,3 +1,63 @@
 #include "global.h"

-#pragma GLOBAL_ASM("asm/non_matchings/boot/contramread/__osContRamRead.s")
+#define BLOCKSIZE 32
+
+s32 __osPfsLastChannel = -1;
+
+s32 __osContRamRead(OSMesgQueue* ctrlrqueue, s32 channel, u16 addr, u8* buffer) {
+    s32 ret;
+    s32 i;
+    u8* bufptr;
+    s32 retryCount = 2;
+
+    __osSiGetAccess();
+    do {
+        bufptr = (u8*)&__osPfsPifRam;
+
+        if ((__osContLastPoll != 2) || (__osPfsLastChannel != channel)) {
+            __osContLastPoll = 2;
+            __osPfsLastChannel = channel;
+            // clang-format off
+            for (i = 0; i < channel; i++) { *bufptr++ = 0; }
+            // clang-format on
+            __osPfsPifRam.status = 1;
+            ((__OSContRamReadFormat*)bufptr)->dummy = 0xFF;
+            ((__OSContRamReadFormat*)bufptr)->txsize = 3;
+            ((__OSContRamReadFormat*)bufptr)->rxsize = 0x21;
+            ((__OSContRamReadFormat*)bufptr)->cmd = CONT_CMD_READ_MEMPACK; // read mempak; send byte 0
+            ((__OSContRamReadFormat*)bufptr)->datacrc = 0xFF;              // read mempak; send byte 0
+            // Received bytes are 6-26 inclusive
+            bufptr[sizeof(__OSContRamReadFormat)] = CONT_CMD_END; // End of commands
+        } else {
+            bufptr += channel;
+        }
+
+        ((__OSContRamReadFormat*)bufptr)->hi = addr >> 3;                                    // send byte 1
+        ((__OSContRamReadFormat*)bufptr)->lo = (s8)(__osContAddressCrc(addr) | (addr << 5)); // send byte 2
+        __osSiRawStartDma(OS_WRITE, &__osPfsPifRam);
+        osRecvMesg(ctrlrqueue, NULL, OS_MESG_BLOCK);
+        __osSiRawStartDma(OS_READ, &__osPfsPifRam);
+        osRecvMesg(ctrlrqueue, NULL, OS_MESG_BLOCK);
+
+        ret = (((__OSContRamReadFormat*)bufptr)->rxsize & 0xC0) >> 4;
+        if (!ret) {
+            if (((__OSContRamReadFormat*)bufptr)->datacrc != __osContDataCrc(bufptr + 6)) {
+                ret = __osPfsGetStatus(ctrlrqueue, channel);
+                if (ret) {
+                    break;
+                }
+                ret = 4; // Retry
+            } else {
+                bcopy(bufptr + 6, buffer, BLOCKSIZE);
+            }
+        } else {
+            ret = 1; // Error
+        }
+        if (ret != 4) {
+            break;
+        }
+    } while (0 <= retryCount--);
+    __osSiRelAccess();
+
+    return ret;
+}