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Protocol Documentation.md

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RunCam Device Protocol

Header Command ID Action ID crc8
0xCC 0x01 Please refer to the 'Action' section for specific values Check code

Action

Action Value Description
RCDEVICE_PROTOCOL_SIMULATE_WIFI_BTN 0x00 Simulation Click the Wi-Fi button
RCDEVICE_PROTOCOL_SIMULATE_POWER_BTN 0x01 Simulation Click the Power button
RCDEVICE_PROTOCOL_CHANGE_MODE 0x02 Switch the camera mode
RCDEVICE_PROTOCOL_CHANGE_START_RECORDING 0x03 Control the camera to start recording
RCDEVICE_PROTOCOL_CHANGE_STOP_RECORDING 0x04 Control the camera to stop recording

CRC-8 calculatation

uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a)
{
    crc ^= a;
    for (int ii = 0; ii < 8; ++ii) {
        if (crc & 0x80) {
            crc = (crc << 1) ^ 0xD5;
        } else {
            crc = crc << 1;
        }
    }

    return crc;
}

to calculate the CRC8_dvb_S2 you call the funtion n times, once for each byte in the array.

eg.:

#include <stdio.h>
#include <stdint.h>

uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a);

unsigned char data[] = {0x00, 0x01, 0x00};

int main()
{
    
    int len = sizeof(data) / sizeof(data[0]);
    uint8_t crc = 0x00;
    for (int i = 0; i < len; i++) {
        crc = crc8_dvb_s2(crc, data[i]);
    }
    printf("CRC-8: 0x%02X\n", crc);
    
    return 0;
}