dali/bacnet_stack
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Use shifts and masking to place the length in the MSTP header. Add comments for the length and for the CRC16 to make the byte order clear.

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kingdl802
2009-08-19 14:17:23 +00:00
parent 17b532c339
commit fae41b3524
1 changed files with 4 additions and 4 deletions
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bacnet-stack/src/mstp.c
+4 -4
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@@ -218,9 +218,9 @@ uint16_t MSTP_Create_Frame(
crc8 = CRC_Calc_Header(buffer[3], crc8);
buffer[4] = source;
crc8 = CRC_Calc_Header(buffer[4], crc8);
buffer[5] = data_len / 256;
buffer[5] = data_len >> 8; /* MSB first */
crc8 = CRC_Calc_Header(buffer[5], crc8);
buffer[6] = data_len % 256;
buffer[6] = data_len & 0xFF;
crc8 = CRC_Calc_Header(buffer[6], crc8);
buffer[7] = ~crc8;
@@ -236,9 +236,9 @@ uint16_t MSTP_Create_Frame(
if (index > 8) {
if ((index + 2) <= buffer_len) {
crc16 = ~crc16;
buffer[index] = (crc16 & 0x00FF);
buffer[index] = crc16 & 0xFF; /* LSB first */
index++;
buffer[index] = ((crc16 & 0xFF00) >> 8);
buffer[index] = crc16 >> 8;
index++;
} else
return 0;