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sdp3x_airspeed: fix shadowing warning for crc

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This commit is contained in:
Beat Küng
2017-06-14 19:53:07 +02:00
committed by Lorenz Meier
parent ba3d66abba
commit 19cdbcfd4f
1 changed files with 6 additions and 6 deletions
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src/drivers/sdp3x_airspeed/SDP3X.cpp
+6 -6
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@@ -187,22 +187,22 @@ SDP3X::cycle()
bool SDP3X::crc(const uint8_t data[], unsigned size, uint8_t checksum) bool SDP3X::crc(const uint8_t data[], unsigned size, uint8_t checksum)
{ {
uint8_t crc = 0xff; uint8_t crc_value = 0xff;
// calculate 8-bit checksum with polynomial 0x31 (x^8 + x^5 + x^4 + 1) // calculate 8-bit checksum with polynomial 0x31 (x^8 + x^5 + x^4 + 1)
for (unsigned i = 0; i < size; i++) { for (unsigned i = 0; i < size; i++) {
crc ^= (data[i]); crc_value ^= (data[i]);
for (int bit = 8; bit > 0; --bit) { for (int bit = 8; bit > 0; --bit) {
if (crc & 0x80) { if (crc_value & 0x80) {
crc = (crc << 1) ^ 0x31; crc_value = (crc_value << 1) ^ 0x31;
} else { } else {
crc = (crc << 1); crc_value = (crc_value << 1);
} }
} }
} }
// verify checksum // verify checksum
return (crc == checksum); return (crc_value == checksum);
} }