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Draft: Type 55 message for Accelerometer data #16

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Draft: Type 55 message for Accelerometer data #16

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d45b79a
Refactor: combine #define for checksum_length/overhead_bytes
lauralindzey Nov 20, 2025
0325675
First take at type_55 message for accelerometer data
lauralindzey Nov 20, 2025
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2 changes: 1 addition & 1 deletion microSWIFT_V2.2/Core/Components/Inc/iridium.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
* Created on: Oct 28, 2022
* Author: Phil
*/
// clang-format off

#ifndef SRC_IRIDIUM_H_
#define SRC_IRIDIUM_H_
Expand Down Expand Up @@ -46,7 +47,6 @@
#define SBDD_RESPONSE_SIZE 20U
#define SBDIX_WAIT_TIME ONE_SECOND * 13U
#define ERROR_MESSAGE_TYPE 99U
#define IRIDIUM_CHECKSUM_LENGTH sizeof(iridium_checksum_t)
#define IRIDIUM_MAX_RESPONSE_SIZE 64U
#define IRIDIUM_DEFAULT_BAUD_RATE 19200U
#define CHECKSUM_FIRST_BYTE_INDEX 327U
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65 changes: 62 additions & 3 deletions microSWIFT_V2.2/Core/Inc/sbd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
* Created on: Sep 18, 2024
* Author: philbush
*/
// clang-format off

#ifndef INC_SBD_H_
#define INC_SBD_H_
Expand All @@ -12,7 +13,6 @@
#include "NEDWaves/rtwhalf.h"
#define TYPE_99_CHAR_BUF_LEN 320
#define IRIDIUM_SBD_MAX_LENGTH 340
#define IRIDIUM_SBD_OVERHEAD_BYTES 2
#define TELEMETRY_FIELD_ERROR_CODE (0x70E2)

// @formatter:off
Expand All @@ -22,6 +22,7 @@ typedef struct
uint8_t checksum_a;
uint8_t checksum_b;
} iridium_checksum_t;
#define IRIDIUM_CHECKSUM_LENGTH sizeof(iridium_checksum_t)

// Primary message type for wave dynamic measurements
typedef struct __packed
Expand Down Expand Up @@ -64,7 +65,7 @@ typedef struct __packed
uint16_t ambient_avgs[17];
} sbd_message_type_53_element;

#define TURBIDITY_MSGS_PER_SBD ((IRIDIUM_SBD_MAX_LENGTH - IRIDIUM_SBD_OVERHEAD_BYTES) / sizeof(sbd_message_type_53_element))
#define TURBIDITY_MSGS_PER_SBD ((IRIDIUM_SBD_MAX_LENGTH - IRIDIUM_CHECKSUM_LENGTH) / sizeof(sbd_message_type_53_element))

// Definition for the SBD message with multiple sample windows
typedef struct __packed
Expand Down Expand Up @@ -102,7 +103,7 @@ typedef struct __packed
uint16_t avg_nir;
} sbd_message_type_54_element;

#define LIGHT_MSGS_PER_SBD ((IRIDIUM_SBD_MAX_LENGTH - IRIDIUM_SBD_OVERHEAD_BYTES) / sizeof(sbd_message_type_54_element))
#define LIGHT_MSGS_PER_SBD ((IRIDIUM_SBD_MAX_LENGTH - IRIDIUM_CHECKSUM_LENGTH) / sizeof(sbd_message_type_54_element))

// Definition for the SBD message with multiple sample windows
typedef struct __packed
Expand All @@ -115,6 +116,64 @@ typedef struct __packed
iridium_checksum_t checksum;
} sbd_message_type_54;

// Definition for accelerometer waves message; based heavily on type_52 for the
// waves component.
typedef struct __packed
{
char legacy_number_7; // byte 0
uint8_t type; // byte 1

// I'm hoping we can omit this, otherwise will have to find 3 bytes elsewhere
// uint8_t port;
// uint16_t size;

uint32_t timestamp; // byte 2-5

float latitude; // byte 6-9
float longitude; // byte 10-13

// bit 0-1: sensitivity (+/- 2, 4, 8g) == {00, 01, 10}
// bit 2: == 0 for low-rate spectra; == 1 for high-rate
// bit 3: ==0 for background/duty-cycle; == 1 for wake-on-shake
// bit 4-7: threshold for wake-on-shake; TODO: define how this translates to counts
uint8_t config; // byte 14
// bit 0-3: count of wake-on-shake events since last duty cycle
// bit 4-7: TBD
uint8_t status; // byte 15

uint16_t min_x_accel; // byte 16-21
uint16_t max_x_accel;
uint16_t mean_x_accel;

uint16_t min_y_accel; // byte 22-27
uint16_t max_y_accel;
uint16_t mean_y_accel;

uint16_t min_z_accel; // byte 28-33
uint16_t max_z_accel;
uint16_t mean_z_accel;

// at 34 bytes here...

// the Waves component is 204 bytes
real16_T Hs;
real16_T Tp;
real16_T Dp;
real16_T E_array[42];
real16_T f_min;
real16_T f_max;
signed char a1_array[42];
signed char b1_array[42];
signed char a2_array[42];
signed char b2_array[42];
unsigned char cf_array[42];

// 2 bytes for the checksum; this MUST be the final element in the struct,
// since the iridium thread calculates the checksum and calls memcpy on
// payload[sizeof(sbd_message_type_55) - IRIDIUM_CHECKSUM_LENGTH]
iridium_checksum_t checksum;
} sbd_message_type_55;

typedef struct
{
char message_body[TYPE_99_CHAR_BUF_LEN];
Expand Down