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[helper] Make crc8 function more flexible to avoid reimplementation in individual components (#10201)

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This commit is contained in:
Jesse Hills
2025-08-20 14:27:08 +12:00
committed by GitHub
parent 0e31bc1a67
commit 0b50ef227b
19 changed files with 379 additions and 147 deletions
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18
esphome/components/am2315c/am2315c.cpp
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@@ -29,22 +29,6 @@ namespace am2315c {
static const char *const TAG = "am2315c";
uint8_t AM2315C::crc8_(uint8_t *data, uint8_t len) {
uint8_t crc = 0xFF;
while (len--) {
crc ^= *data++;
for (uint8_t i = 0; i < 8; i++) {
if (crc & 0x80) {
crc <<= 1;
crc ^= 0x31;
} else {
crc <<= 1;
}
}
}
return crc;
}
bool AM2315C::reset_register_(uint8_t reg) {
// code based on demo code sent by www.aosong.com
// no further documentation.
@@ -86,7 +70,7 @@ bool AM2315C::convert_(uint8_t *data, float &humidity, float &temperature) {
humidity = raw * 9.5367431640625e-5;
raw = ((data[3] & 0x0F) << 16) | (data[4] << 8) | data[5];
temperature = raw * 1.9073486328125e-4 - 50;
return this->crc8_(data, 6) == data[6];
return crc8(data, 6, 0xFF, 0x31, true) == data[6];
}
void AM2315C::setup() {