2023-11-08 20:45:22 -04:00
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#pragma once
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#include "AP_RangeFinder_config.h"
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#if AP_RANGEFINDER_JRE_SERIAL_ENABLED
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#include "AP_RangeFinder.h"
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#include "AP_RangeFinder_Backend_Serial.h"
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/*
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The data received from the radio altimeter is as follows.
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The format of the received data frame varies depending on the mode, and is stored in "read_buff" with a fixed value of 16 bytes, 32 bytes, or 48 bytes.
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[1]
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Measurement mode: 1 data mode
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Packet length: 16 bytes
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Altitude data used: 4,5 bytes
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|----------------------------------------------------------------------------------------------------------------------------------------------------|
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| BYTE | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
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|------|---------------------------------------------------------------------------------------------------------------------------------------------|
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| NAME | header | header | version | frame | altitude | altitude | reserved | FFT value | FFT value | status | status | CRC | CRC |
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| | (H) | (L) | | count | (H) | (L) | | (H) | (L) | (H) | (L) | (L) | (H) |
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|------|---------------------------------------------------------------------------------------------------------------------------------------------|
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| | | | | | | | | BIT 15to8: reserved | |
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| | | | | unsigned | unsigned | | unsigned | BIT 7to4: GAIN detail | CRC result |
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| DATA | 'R' | 'A' | 0 to 255 | 0 to 255 | LSB;0.01 m | N/A | LSB:1 | BIT 3-2: reserved | from BYTE |
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| | | | | | 0 to 65535 | | 0 to 65535 | BIT 1: TRK / NTRK | 0 to 13 |
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| | | | | | | | | BIT 0: GAIN LOW/HIGH | |
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|----------------------------------------------------------------------------------------------------------------------------------------------------|
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[2]
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Measurement mode: 3 data mode
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Packet length: 32 bytes
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Altitude data used: 4,5 bytes
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| BYTE | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14| 15| 16| 17| 18 | 19 | 20 | 21 | 22| 23| 24| 25| 26 | 27 | 28 | 29 | 30 | 31 |
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|------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| NAME | header | header | version | frame | altitude | altitude | reserved | FFT value | FFT value | altitude | altitude | reserved | FFT value | FFT value | altitude | altitude | reserved | FFT value | FFT value | status | status | CRC | CRC |
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| | (H) | (L) | | count | (H) | (L) | | (H) | (L) | (H) | (L) | | (H) | (L) | (H) | (L) | | (H) | (L) | (H) | (L) | (L) | (H) |
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|------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| | | | | | | | | | | | | | | BIT 15to8: reserved | |
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| | | | | unsigned | unsigned | | unsigned | unsigned | | unsigned | unsigned | | unsigned | BIT 7to4: GAIN detail | CRC result |
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| DATA | 'R' | 'B' | 0 to 255 | 0 to 255 | LSB;0.01 m | N/A | LSB:1 | LSB;0.01 m | N/A | LSB:1 | LSB;0.01 m | N/A | LSB:1 | BIT 3-2: reserved | from BYTE |
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| | | | | | 0 to 65535 | | 0 to 65535 | 0 to 65535 | | 0 to 65535 | 0 to 65535 | | 0 to 65535 | BIT 1: TRK / NTRK | 0 to 13 |
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| | | | | | | | | | | | | | | BIT 0: GAIN LOW/HIGH | |
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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[3]
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Measurement mode: 5 data mode
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Packet length: 48 bytes
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Altitude data used: 4,5 bytes
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| BYTE | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14| 15| 16| 17| 18 | 19 | 20 | 21 | 22| 23| 24| 25| 26 | 27 | 28 | 29 | 30| 31| 32| 33| 34 | 35 | 36 | 37 | 38| 39| 40| 41| 42 | 43 | 44 | 45 | 46 | 47 |
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|------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| NAME | header | header | version | frame | altitude | altitude | reserved | FFT value | FFT value | altitude | altitude | reserved | FFT value | FFT value | altitude | altitude | reserved | FFT value | FFT value | altitude | altitude | reserved | FFT value | FFT value | altitude | altitude | reserved | FFT value | FFT value | status | status | CRC | CRC |
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| | (H) | (L) | | count | (H) | (L) | | (H) | (L) | (H) | (L) | | (H) | (L) | (H) | (L) | | (H) | (L) | (H) | (L) | | (H) | (L) | (H) | (L) | | (H) | (L) | (H) | (L) | (L) | (H) |
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|------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| | | | | | | | | | | | | | | | | | | | | BIT 15to8: reserved | |
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| | | | | unsigned | unsigned | | unsigned | unsigned | | unsigned | unsigned | | unsigned | unsigned | | unsigned | unsigned | | unsigned | BIT 7to4: GAIN detail | CRC result |
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| DATA | 'R' | 'C' | 0 to 255 | 0 to 255 | LSB;0.01 m | N/A | LSB:1 | LSB;0.01 m | N/A | LSB:1 | LSB;0.01 m | N/A | LSB:1 | LSB;0.01 m | N/A | LSB:1 | LSB;0.01 m | N/A | LSB:1 | BIT 3-2: reserved | from BYTE |
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| | | | | | 0 to 65535 | | 0 to 65535 | 0 to 65535 | | 0 to 65535 | 0 to 65535 | | 0 to 65535 | 0 to 65535 | | 0 to 65535 | 0 to 65535 | | 0 to 65535 | BIT 1: TRK / NTRK | 0 to 13 |
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| | | | | | | | | | | | | | | | | | | | | BIT 0: GAIN LOW/HIGH | |
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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*/
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class AP_RangeFinder_JRE_Serial : public AP_RangeFinder_Backend_Serial
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{
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public:
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static AP_RangeFinder_Backend_Serial *create(
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RangeFinder::RangeFinder_State &_state,
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AP_RangeFinder_Params &_params)
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{
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return new AP_RangeFinder_JRE_Serial(_state, _params);
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}
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protected:
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using AP_RangeFinder_Backend_Serial::AP_RangeFinder_Backend_Serial;
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MAV_DISTANCE_SENSOR _get_mav_distance_sensor_type() const override
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{
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return MAV_DISTANCE_SENSOR_RADAR;
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}
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bool get_signal_quality_pct(int8_t &quality_pct) const override {
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quality_pct = no_signal ? 0 : 100;
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return true;
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}
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private:
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// get a reading
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bool get_reading(float &reading_m) override;
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2023-11-13 21:46:50 -04:00
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void move_preamble_in_buffer(uint8_t search_start_pos);
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uint8_t data_buff[48 * 3]; // 48 is longest possible packet
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2023-11-14 20:30:11 -04:00
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uint8_t data_buff_ofs; // index where next item will be added in data_buff
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2023-11-08 20:45:22 -04:00
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bool no_signal; // true if the latest read attempt found no valid distances
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};
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#endif // AP_RANGEFINDER_JRE_SERIAL_ENABLED
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