ash_protocol.cpp

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#include "ash_protocol.h"
 
#include "esphome/core/helpers.h"
 
namespace esphome::ezsp_proxy_tap {
 
void ash_build_ack_frame(uint8_t *output, uint8_t ack_num) {
  // ACK control byte: 100nrPPP, where PPP is the next frame number expected
  const uint8_t control = 0x80 | (ack_num & ASH_MAX_SEQUENCE);
  const uint16_t crc = crc16be(&control, 1, ASH_CRC_INIT);
 
  output[0] = ASH_FLAG_BYTE;
  output[1] = control;
  output[2] = crc >> 8;
  output[3] = crc & 0xFF;
  output[4] = ASH_FLAG_BYTE;
}
 
}  // namespace esphome::ezsp_proxy_tap