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Fix dataflash read by only using serialWriteBuf in mspSerialEncode

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This commit is contained in:
Martin Budden 2016-11-23 18:02:32 +00:00
parent 4040a1dd7a
commit 83472a6989
1 changed files with 9 additions and 8 deletions
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17
src/main/msp/msp_serial.c
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@ -125,20 +125,21 @@ static int mspSerialEncode(mspPort_t *msp, mspPacket_t *packet)
serialBeginWrite(msp->port);
const int len = sbufBytesRemaining(&packet->buf);
const int mspLen = len < JUMBO_FRAME_SIZE_LIMIT ? len : JUMBO_FRAME_SIZE_LIMIT;
const uint8_t hdr[5] = {'$', 'M', packet->result == MSP_RESULT_ERROR ? '!' : '>', mspLen, packet->cmd};
serialWriteBuf(msp->port, hdr, sizeof(hdr));
uint8_t checksum = mspSerialChecksumBuf(0, hdr + 3, 2); // checksum starts from len field
uint8_t hdr[8] = {'$', 'M', packet->result == MSP_RESULT_ERROR ? '!' : '>', mspLen, packet->cmd};
int hdrLen = 5;
#define CHECKSUM_STARTPOS 3 // checksum starts from mspLen field
if (len >= JUMBO_FRAME_SIZE_LIMIT) {
serialWrite(msp->port, len & 0xff);
checksum ^= len & 0xff;
serialWrite(msp->port, (len >> 8) & 0xff);
checksum ^= (len >> 8) & 0xff;
hdrLen += 2;
hdr[5] = len & 0xff;
hdr[6] = (len >> 8) & 0xff;
}
serialWriteBuf(msp->port, hdr, hdrLen);
uint8_t checksum = mspSerialChecksumBuf(0, hdr + CHECKSUM_STARTPOS, hdrLen - CHECKSUM_STARTPOS);
if (len > 0) {
serialWriteBuf(msp->port, sbufPtr(&packet->buf), len);
checksum = mspSerialChecksumBuf(checksum, sbufPtr(&packet->buf), len);
}
serialWrite(msp->port, checksum);
serialWriteBuf(msp->port, &checksum, 1);
serialEndWrite(msp->port);
return sizeof(hdr) + len + 1; // header, data, and checksum
}