mirror of https://github.com/ArduPilot/ardupilot
125 lines
4.0 KiB
C++
125 lines
4.0 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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Simulator for the RDS02UF rangefinder
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*/
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#include "SIM_RF_RDS02UF.h"
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#include <stdio.h>
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using namespace SITL;
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const uint8_t crc8_table[256] = {
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0x93,0x98,0xE4,0x46,0xEB,0xBA,0x04,0x4C,
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0xFA,0x40,0xB8,0x96,0x0E,0xB2,0xB7,0xC0,
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0x0C,0x32,0x9B,0x80,0xFF,0x30,0x7F,0x9D,
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0xB3,0x81,0x58,0xE7,0xF1,0x19,0x7E,0xB6,
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0xCD,0xF7,0xB4,0xCB,0xBC,0x5C,0xD6,0x09,
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0x20,0x0A,0xE0,0x37,0x51,0x67,0x24,0x95,
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0xE1,0x62,0xF8,0x5E,0x38,0x15,0x54,0x77,
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0x63,0x57,0x6D,0xE9,0x89,0x76,0xBE,0x41,
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0x5D,0xF9,0xB1,0x4D,0x6C,0x53,0x9C,0xA2,
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0x23,0xC4,0x8E,0xC8,0x05,0x42,0x61,0x71,
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0xC5,0x00,0x18,0x6F,0x5F,0xFB,0x7B,0x11,
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0x65,0x2D,0x8C,0xED,0x14,0xAB,0x88,0xD5,
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0xD9,0xC2,0x36,0x34,0x7C,0x5B,0x3C,0xF6,
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0x48,0x0B,0xEE,0x02,0x83,0x79,0x17,0xE6,
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0xA8,0x78,0xF5,0xD3,0x4E,0x50,0x52,0x91,
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0xD8,0xC6,0x22,0xEC,0x3B,0xE5,0x3F,0x86,
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0x06,0xCF,0x2B,0x2F,0x3D,0x59,0x1C,0x87,
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0xEF,0x4F,0x10,0xD2,0x7D,0xDA,0x72,0xA0,
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0x9F,0xDE,0x6B,0x75,0x56,0xBD,0xC7,0xC1,
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0x70,0x1D,0x25,0x92,0xA5,0x31,0xE2,0xD7,
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0xD0,0x9A,0xAF,0xA9,0xC9,0x97,0x08,0x33,
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0x5A,0x99,0xC3,0x16,0x84,0x82,0x8A,0xF3,
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0x4A,0xCE,0xDB,0x29,0x0F,0xAE,0x6E,0xE3,
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0x8B,0x07,0x3A,0x74,0x47,0xB0,0xBB,0xB5,
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0x7A,0xAA,0x2C,0xD4,0x03,0x3E,0x1A,0xA7,
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0x27,0x64,0x06,0xBF,0x55,0x73,0x1E,0xFE,
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0x49,0x01,0x39,0x28,0xF4,0x26,0xDF,0xDD,
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0x44,0x0D,0x21,0xF2,0x85,0xB9,0xEA,0x4B,
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0xDC,0x6A,0xCA,0xAC,0x12,0xFC,0x2E,0x2A,
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0xA3,0xF0,0x66,0xE8,0x60,0x45,0xA1,0x8D,
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0x68,0x35,0xFD,0x8F,0x9E,0x1F,0x13,0xD1,
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0xAD,0x69,0xCC,0xA4,0x94,0x90,0x1B,0x43,
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};
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static uint8_t xcrc8(uint8_t* pbuf, int32_t len)
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{
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uint8_t* data = pbuf;
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uint8_t crc = 0;
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while ( len-- )
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crc = crc8_table[crc^*(data++)];
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return crc;
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}
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uint32_t RF_RDS02UF::packet_for_alt(uint16_t alt_cm, uint8_t *buffer, uint8_t buflen)
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{
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const uint16_t fc_code = 0x3ff; // NFI what this means
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const uint16_t data_fc = 0x70c; // NFI what this means
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// bodgy fixed-length response to keep things simple:
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union response_t {
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struct {
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uint8_t header1;
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uint8_t header2;
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uint8_t address;
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uint8_t error_code;
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uint8_t fc_code_l;
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uint8_t fc_code_h;
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uint8_t length_l;
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uint8_t length_h;
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uint8_t data0; // used
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uint8_t data1; // used
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uint8_t data2;
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uint8_t data3;
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uint8_t data4;
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uint8_t data5; // distance-low
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uint8_t data6; // distance-high
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uint8_t data7;
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uint8_t data8;
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uint8_t data9;
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uint8_t crc8;
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uint8_t footer1;
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uint8_t footer2;
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};
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uint8_t buffer[21];
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} response{};
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response.header1 = 0x55;
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response.header2 = 0x55;
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response.fc_code_l = fc_code & 0xff;
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response.fc_code_h = fc_code >> 8;
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response.length_l = 10;
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response.length_h = 0;
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response.data0 = data_fc & 0xff;
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response.data1 = data_fc >> 8;
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response.data5 = alt_cm & 0xff;
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response.data6 = alt_cm >> 8;
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response.crc8 = xcrc8(&response.buffer[2], 16);
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response.footer1 = 0xAA;
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response.footer2 = 0xAA;
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if (buflen < ARRAY_SIZE(response.buffer)) {
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AP_HAL::panic("Too short a buffer");
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}
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memcpy(buffer, response.buffer, ARRAY_SIZE(response.buffer));
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return ARRAY_SIZE(response.buffer);
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}
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