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Code Issues Releases Wiki Activity

Move crc16 to helpers (#3780)

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This commit is contained in:
Jesse Hills
2022-09-06 12:57:21 +12:00
committed by GitHub
parent 614eb81ad7
commit c317422ed7
7 changed files with 23 additions and 58 deletions
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24
esphome/components/am2320/am2320.cpp
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@@ -4,33 +4,15 @@
// - Arduino - AM2320: https://github.com/EngDial/AM2320/blob/master/src/AM2320.cpp
#include "am2320.h"
#include "esphome/core/log.h"
#include "esphome/core/hal.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
namespace esphome {
namespace am2320 {
static const char *const TAG = "am2320";
// ---=== Calc CRC16 ===---
uint16_t crc_16(uint8_t *ptr, uint8_t length) {
uint16_t crc = 0xFFFF;
uint8_t i;
//------------------------------
while (length--) {
crc ^= *ptr++;
for (i = 0; i < 8; i++) {
if ((crc & 0x01) != 0) {
crc >>= 1;
crc ^= 0xA001;
} else {
crc >>= 1;
}
}
}
return crc;
}
void AM2320Component::update() {
uint8_t data[8];
data[0] = 0;
@@ -98,7 +80,7 @@ bool AM2320Component::read_data_(uint8_t *data) {
checksum = data[7] << 8;
checksum += data[6];
if (crc_16(data, 6) != checksum) {
if (crc16(data, 6) != checksum) {
ESP_LOGW(TAG, "AM2320 Checksum invalid!");
return false;
}