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Merge pull request #465 from hharte/fix-northstar-decoder

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northstar: Fix after decoder change.
This commit is contained in:
David Given
2022-02-21 21:42:13 +00:00
committed by GitHub
parent 659b668012 8cbef669b1
commit 0fc5f0ee7d
2 changed files with 5 additions and 13 deletions
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15
arch/northstar/decoder.cc
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@@ -127,9 +127,9 @@ public:
void decodeSectorRecord() override
{
uint64_t id = toBytes(readRawBits(64)).reader().read_be64();
unsigned recordSize, payloadSize, headerSize;
if (id == SECTOR_TYPE_MFM) {
if (id == MFM_ID) {
recordSize = NORTHSTAR_ENCODED_SECTOR_SIZE_DD;
payloadSize = NORTHSTAR_PAYLOAD_SIZE_DD;
headerSize = NORTHSTAR_HEADER_SIZE_DD;
@@ -143,22 +143,18 @@ public:
auto rawbits = readRawBits(recordSize * 16);
auto bytes = decodeFmMfm(rawbits).slice(0, recordSize);
ByteReader br(bytes);
uint8_t sync_char;
_sector->logicalSide = _sector->physicalHead;
_sector->logicalSector = _hardSectorId;
_sector->logicalTrack = _sector->physicalCylinder;
sync_char = br.read_8(); /* Sync char: 0xFB */
if (_sectorType == SECTOR_TYPE_MFM) {
sync_char = br.read_8();/* MFM second Sync char, usually 0xFB */
if (headerSize == NORTHSTAR_HEADER_SIZE_DD) {
br.read_8(); /* MFM second Sync char, usually 0xFB */
}
_sector->data = br.read(payloadSize);
uint8_t wantChecksum = br.read_8();
uint8_t gotChecksum = northstarChecksum(bytes.slice(headerSize, payloadSize));
uint8_t gotChecksum = northstarChecksum(bytes.slice(headerSize - 1, payloadSize));
_sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
}
@@ -170,7 +166,6 @@ public:
private:
const NorthstarDecoderProto& _config;
uint8_t _sectorType = SECTOR_TYPE_MFM;
uint8_t _hardSectorId;
};

3
arch/northstar/northstar.h
View File

@@ -22,9 +22,6 @@
#define NORTHSTAR_ENCODED_SECTOR_SIZE_SD (NORTHSTAR_HEADER_SIZE_SD + NORTHSTAR_PAYLOAD_SIZE_SD + NORTHSTAR_CHECKSUM_SIZE)
#define NORTHSTAR_ENCODED_SECTOR_SIZE_DD (NORTHSTAR_HEADER_SIZE_DD + NORTHSTAR_PAYLOAD_SIZE_DD + NORTHSTAR_CHECKSUM_SIZE)
#define SECTOR_TYPE_MFM (0)
#define SECTOR_TYPE_FM (1)
class AbstractDecoder;
class AbstractEncoder;
class EncoderProto;