22 lines
471 B
C
22 lines
471 B
C
#ifndef __crc_h
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#define __crc_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <Arduino.h>
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//modbus crc calculation borrowed from:
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//https://github.com/yaacov/ArduinoModbusSlave
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#define MODBUS_CRC_LENGTH 2
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#define readUInt16(arr, index) (arr[index]<<8 | arr[index + 1])
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#define readCRC(arr, length) (arr[(length - MODBUS_CRC_LENGTH) + 1] << 8 | arr[length - MODBUS_CRC_LENGTH])
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uint16_t calculateCRC(uint8_t *buffer, int length);
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#ifdef __cplusplus
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}
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#endif
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#endif |