Dimitri Gruebel
Reaction Wheel Actuated Satellite Dynamics Test Platform
Diploma Thesis in Aerospace Engineering, January 2014
University of Applied Sciences Munich, Faculty 03
Electronics:
- 1x mbed NXP LPC 1768 Microcontroller
- 2x XBee S1 Radios + Sparkfun USB Adapter
- 1x CHR UM6-lt IMU
- 4x Graupner BEC 8 Motor Controllers
- 4x ROXXY 2826/09 Brushless Motors
- 1x Hacker TopFuel LiPo 1300mAh Battery
- 1x big Selfmade BreakOutBoard to connect all components
- 1x small BreakOutBoard to connect IMU
Hardware developed with Catia V5R20
Manufactoring Technology: Rapid Prototyping - EOS Formiga P110
Controlled via text based menu with DockLight
__________________
UM6_config/UM6_config.h
- Committer:
- DimitriGruebel
- Date:
- 2014-07-09
- Revision:
- 0:1447d2f773db
File content as of revision 0:1447d2f773db:
/* ------------------------------------------------------------------------------
File: UM6_config.h
Author: CH Robotics
Version: 1.0
Description: Preprocessor definitions and function declarations for UM6 configuration
------------------------------------------------------------------------------ */
#ifndef __UM6_CONFIG_H
#define __UM6_CONFIG_H
#include "UM6_usart.h"
MODSERIAL um6_uart(p9, p10); // UM6 SERIAL OVER UART Pin 9 & Pin 10
// CONFIG_ARRAY_SIZE and DATA_ARRAY_SIZE specify the number of 32 bit configuration and data registers used by the firmware
// (Note: The term "register" is used loosely here. These "registers" are not actually registers in the same sense of a
// microcontroller register. They are simply index locations into arrays stored in global memory. Data and configuration
// parameters are stored in arrays because it allows a common communication protocol to be used to access all data and
// configuration. The software communicating with the sensor needs only specify the register address, and the communication
// software running on the sensor knows exactly where to find it - it needn't know what the data is. The software communicatin
// with the sensor, on the other hand, needs to know what it is asking for (naturally...)
// This setup makes it easy to make more data immediately available when needed - simply increase the array size, add code in
// the firmware that writes data to the new array location, and then make updates to the firmware definition on the PC side.
#define CONFIG_ARRAY_SIZE 44
#define DATA_ARRAY_SIZE 33
#define COMMAND_COUNT 9
//
#define CONFIG_REG_START_ADDRESS 0
#define DATA_REG_START_ADDRESS 85
#define COMMAND_START_ADDRESS 170
// These preprocessor definitions make it easier to access specific configuration parameters in code
// They specify array locations associated with each register name. Note that in the comments below, many of the values are
// said to be 32-bit IEEE floating point. Obviously this isn't directly the case, since the arrays are actually 32-bit unsigned
// integer arrays. Bit for bit, the data does correspond to the correct floating point value. Since you can't cast ints as floats,
// special conversion has to happen to copy the float data to and from the array.
// Starting with configuration register locations...
// Now for data register locations.
// In the communication protocol, data registers are labeled with number ranging from 128 to 255. The value of 128 will be subtracted from these numbers
// to produce the actual array index labeled below
#define UM6_STATUS DATA_REG_START_ADDRESS // Status register defines error codes with individual bits
#define UM6_GYRO_RAW_XY (DATA_REG_START_ADDRESS + 1) // Raw gyro data is stored in 16-bit signed integers
#define UM6_GYRO_RAW_Z (DATA_REG_START_ADDRESS + 2)
#define UM6_ACCEL_RAW_XY (DATA_REG_START_ADDRESS + 3) // Raw accel data is stored in 16-bit signed integers
#define UM6_ACCEL_RAW_Z (DATA_REG_START_ADDRESS + 4)
#define UM6_MAG_RAW_XY (DATA_REG_START_ADDRESS + 5) // Raw mag data is stored in 16-bit signed integers
#define UM6_MAG_RAW_Z (DATA_REG_START_ADDRESS + 6)
#define UM6_GYRO_PROC_XY (DATA_REG_START_ADDRESS + 7) // Processed gyro data has scale factors applied and alignment correction performed. Data is 16-bit signed integer.
#define UM6_GYRO_PROC_Z (DATA_REG_START_ADDRESS + 8)
#define UM6_ACCEL_PROC_XY (DATA_REG_START_ADDRESS + 9) // Processed accel data has scale factors applied and alignment correction performed. Data is 16-bit signed integer.
#define UM6_ACCEL_PROC_Z (DATA_REG_START_ADDRESS + 10)
#define UM6_MAG_PROC_XY (DATA_REG_START_ADDRESS + 11) // Processed mag data has scale factors applied and alignment correction performed. Data is 16-bit signed integer.
#define UM6_MAG_PROC_Z (DATA_REG_START_ADDRESS + 12)
#define UM6_EULER_PHI_THETA (DATA_REG_START_ADDRESS + 13) // Euler angles are 32-bit IEEE floating point
#define UM6_EULER_PSI (DATA_REG_START_ADDRESS + 14)
#define UM6_QUAT_AB (DATA_REG_START_ADDRESS + 15) // Quaternions are 16-bit signed integers.
#define UM6_QUAT_CD (DATA_REG_START_ADDRESS + 16)
#define UM6_ERROR_COV_00 (DATA_REG_START_ADDRESS + 17) // Error covariance is a 4x4 matrix of 32-bit IEEE floating point values
#define UM6_ERROR_COV_01 (DATA_REG_START_ADDRESS + 18)
#define UM6_ERROR_COV_02 (DATA_REG_START_ADDRESS + 19)
#define UM6_ERROR_COV_03 (DATA_REG_START_ADDRESS + 20)
#define UM6_ERROR_COV_10 (DATA_REG_START_ADDRESS + 21)
#define UM6_ERROR_COV_11 (DATA_REG_START_ADDRESS + 22)
#define UM6_ERROR_COV_12 (DATA_REG_START_ADDRESS + 23)
#define UM6_ERROR_COV_13 (DATA_REG_START_ADDRESS + 24)
#define UM6_ERROR_COV_20 (DATA_REG_START_ADDRESS + 25)
#define UM6_ERROR_COV_21 (DATA_REG_START_ADDRESS + 26)
#define UM6_ERROR_COV_22 (DATA_REG_START_ADDRESS + 27)
#define UM6_ERROR_COV_23 (DATA_REG_START_ADDRESS + 28)
#define UM6_ERROR_COV_30 (DATA_REG_START_ADDRESS + 29)
#define UM6_ERROR_COV_31 (DATA_REG_START_ADDRESS + 30)
#define UM6_ERROR_COV_32 (DATA_REG_START_ADDRESS + 31)
#define UM6_ERROR_COV_33 (DATA_REG_START_ADDRESS + 32)
#define UM6_GET_FW_VERSION COMMAND_START_ADDRESS // Causes the UM6 to report the firmware revision
#define UM6_FLASH_COMMIT (COMMAND_START_ADDRESS + 1) // Causes the UM6 to write all configuration values to FLASH
#define UM6_ZERO_GYROS (COMMAND_START_ADDRESS + 2) // Causes the UM6 to start a zero gyros command
#define UM6_RESET_EKF (COMMAND_START_ADDRESS + 3) // Causes the UM6 to reset the EKF
#define UM6_GET_DATA (COMMAND_START_ADDRESS + 4) // Causes the UM6 to transmit a data packet containing data from all enabled channels
#define UM6_SET_ACCEL_REF (COMMAND_START_ADDRESS + 5) // Causes the UM6 to set the current measured accel data to the reference vector
#define UM6_SET_MAG_REF (COMMAND_START_ADDRESS + 6) // Causes the UM6 to set the current measured magnetometer data to the reference vector
#define UM6_RESET_TO_FACTORY (COMMAND_START_ADDRESS + 7) // Causes the UM6 to load default factory settings
#define UM6_SAVE_FACTORY (COMMAND_START_ADDRESS + 8) // Causes the UM6 to save the current settings to the factory flash location
#define UM6_USE_CONFIG_ADDRESS 0
#define UM6_USE_FACTORY_ADDRESS 1
#define UM6_BAD_CHECKSUM 253 // Sent if the UM6 receives a packet with a bad checksum
#define UM6_UNKNOWN_ADDRESS 254 // Sent if the UM6 receives a packet with an unknown address
#define UM6_INVALID_BATCH_SIZE 255 // Sent if a requested batch read or write operation would go beyond the bounds of the config or data array
/*******************************************************************************
* Function Name : ComputeChecksum
* Input : USARTPacket* new_packet
* Output : None
* Return : uint16_t
* Description : Returns the two byte sum of all the individual bytes in the
given packet.
*******************************************************************************/
uint16_t ComputeChecksum( USARTPacket* new_packet ) {
int32_t index;
uint16_t checksum = 0x73 + 0x6E + 0x70 + new_packet->PT + new_packet->address;
for ( index = 0; index < new_packet->data_length; index++ ) {
checksum += new_packet->packet_data[index];
}
return checksum;
}
static USARTPacket new_packet;
// Flag for storing the current USART state
uint8_t gUSART_State = USART_STATE_WAIT;
struct UM6{
float Gyro_Proc_X;
float Gyro_Proc_Y;
float Gyro_Proc_Z;
float Accel_Proc_X;
float Accel_Proc_Y;
float Accel_Proc_Z;
float Mag_Proc_X;
float Mag_Proc_Y;
float Mag_Proc_Z;
float Roll;
float Pitch;
float Yaw;
};
UM6 data;
void Process_um6_packet() {
int16_t MY_DATA_GYRO_PROC_X;
int16_t MY_DATA_GYRO_PROC_Y;
int16_t MY_DATA_GYRO_PROC_Z;
int16_t MY_DATA_ACCEL_PROC_X;
int16_t MY_DATA_ACCEL_PROC_Y;
int16_t MY_DATA_ACCEL_PROC_Z;
int16_t MY_DATA_MAG_PROC_X;
int16_t MY_DATA_MAG_PROC_Y;
int16_t MY_DATA_MAG_PROC_Z;
int16_t MY_DATA_EULER_PHI;
int16_t MY_DATA_EULER_THETA;
int16_t MY_DATA_EULER_PSI;
static uint8_t data_counter = 0;
// The next action should depend on the USART state.
switch ( gUSART_State ) {
// USART in the WAIT state. In this state, the USART is waiting to see the sequence of bytes
// that signals a new incoming packet.
case USART_STATE_WAIT:
if ( data_counter == 0 ) { // Waiting on 's' character
if ( um6_uart.getc() == 's' ) {
data_counter++;
} else {
data_counter = 0;
}
} else if ( data_counter == 1 ) { // Waiting on 'n' character
if ( um6_uart.getc() == 'n' ) {
data_counter++;
} else {
data_counter = 0;
}
} else if ( data_counter == 2 ) { // Waiting on 'p' character
if ( um6_uart.getc() == 'p' ) {
// The full 'snp' sequence was received. Reset data_counter (it will be used again
// later) and transition to the next state.
data_counter = 0;
gUSART_State = USART_STATE_TYPE;
} else {
data_counter = 0;
}
}
break;
// USART in the TYPE state. In this state, the USART has just received the sequence of bytes that
// indicates a new packet is about to arrive. Now, the USART expects to see the packet type.
case USART_STATE_TYPE:
new_packet.PT = um6_uart.getc();
gUSART_State = USART_STATE_ADDRESS;
break;
// USART in the ADDRESS state. In this state, the USART expects to receive a single byte indicating
// the address that the packet applies to
case USART_STATE_ADDRESS:
new_packet.address = um6_uart.getc();
// For convenience, identify the type of packet this is and copy to the packet structure
// (this will be used by the packet handler later)
if ( (new_packet.address >= CONFIG_REG_START_ADDRESS) && (new_packet.address < DATA_REG_START_ADDRESS) ) {
new_packet.address_type = ADDRESS_TYPE_CONFIG;
} else if ( (new_packet.address >= DATA_REG_START_ADDRESS) && (new_packet.address < COMMAND_START_ADDRESS) ) {
new_packet.address_type = ADDRESS_TYPE_DATA;
} else {
new_packet.address_type = ADDRESS_TYPE_COMMAND;
}
// Identify the type of communication this is (whether reading or writing to a data or configuration register, or sending a command)
// If this is a read operation, jump directly to the USART_STATE_CHECKSUM state - there is no more data in the packet
if ( (new_packet.PT & PACKET_HAS_DATA) == 0 ) {
gUSART_State = USART_STATE_CHECKSUM;
}
// If this is a write operation, go to the USART_STATE_DATA state to read in the relevant data
else {
gUSART_State = USART_STATE_DATA;
// Determine the expected number of bytes in this data packet based on the packet type. A write operation
// consists of 4 bytes unless it is a batch operation, in which case the number of bytes equals 4*batch_size,
// where the batch size is also given in the packet type byte.
if ( new_packet.PT & PACKET_IS_BATCH ) {
new_packet.data_length = 4*((new_packet.PT >> 2) & PACKET_BATCH_LENGTH_MASK);
} else {
new_packet.data_length = 4;
}
}
break;
// USART in the DATA state. In this state, the USART expects to receive new_packet.length bytes of
// data.
case USART_STATE_DATA:
new_packet.packet_data[data_counter] = um6_uart.getc();
data_counter++;
// If the expected number of bytes has been received, transition to the CHECKSUM state.
if ( data_counter == new_packet.data_length ) {
// Reset data_counter, since it will be used in the CHECKSUM state.
data_counter = 0;
gUSART_State = USART_STATE_CHECKSUM;
}
break;
// USART in CHECKSUM state. In this state, the entire packet has been received, with the exception
// of the 16-bit checksum.
case USART_STATE_CHECKSUM:
// Get the highest-order byte
if ( data_counter == 0 ) {
new_packet.checksum = ((uint16_t)um6_uart.getc() << 8);
data_counter++;
} else { // ( data_counter == 1 )
// Get lower-order byte
new_packet.checksum = new_packet.checksum | ((uint16_t)um6_uart.getc() & 0x0FF);
// Both checksum bytes have been received. Make sure that the checksum is valid.
uint16_t checksum = ComputeChecksum( &new_packet );
// If checksum does not match, exit function
if ( checksum != new_packet.checksum ) {
return;
} // end if(checksum check)
else
{
// Packet was received correctly.
//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------
//
// CHECKSUM WAS GOOD SO GET ARE DATA!!!!!!!!!!!!
// IF DATA ADDRESS
if (new_packet.address_type == ADDRESS_TYPE_DATA) {
//------------------------------------------------------------
// UM6_GYRO_PROC_XY (0x5C)
// To convert the register data from 16-bit 2's complement integers to actual angular rates in degrees
// per second, the data should be multiplied by the scale factor 0.0610352 as shown below
// angular_rate = register_data*0.0610352
if (new_packet.address == UM6_GYRO_PROC_XY) {
// GYRO_PROC_X
MY_DATA_GYRO_PROC_X = (int16_t)new_packet.packet_data[0]<<8; //bitshift it
MY_DATA_GYRO_PROC_X |= new_packet.packet_data[1];
data.Gyro_Proc_X = MY_DATA_GYRO_PROC_X*0.0610352;
MY_DATA_GYRO_PROC_Y = (int16_t)new_packet.packet_data[2]<<8; //bitshift it
MY_DATA_GYRO_PROC_Y |= new_packet.packet_data[3];
data.Gyro_Proc_Y = MY_DATA_GYRO_PROC_Y*0.0610352;
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_GYRO_PROC_Z (0x5D)
// To convert the register data from a 16-bit 2's complement integer to the actual angular rate in
// degrees per second, the data should be multiplied by the scale factor 0.0610352 as shown below.
// GYRO_PROC_Z
MY_DATA_GYRO_PROC_Z = (int16_t)new_packet.packet_data[4]<<8; //bitshift it
MY_DATA_GYRO_PROC_Z |= new_packet.packet_data[5];;
data.Gyro_Proc_Z = MY_DATA_GYRO_PROC_Z*0.0610352;
} // end if(MY_DATA_GYRO_PROC)
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_ACCEL_PROC_XY (0x5E)
// To convert the register data from 16-bit 2's complement integers to actual acceleration in gravities,
// the data should be multiplied by the scale factor 0.000183105 as shown below.
// acceleration = register_data* 0.000183105
if (new_packet.address == UM6_ACCEL_PROC_XY) {
// ACCEL_PROC_X
MY_DATA_ACCEL_PROC_X = (int16_t)new_packet.packet_data[0]<<8; //bitshift it
MY_DATA_ACCEL_PROC_X |= new_packet.packet_data[1];
data.Accel_Proc_X = MY_DATA_ACCEL_PROC_X*0.000183105;
// ACCEL_PROC_Y
MY_DATA_ACCEL_PROC_Y = (int16_t)new_packet.packet_data[2]<<8; //bitshift it
MY_DATA_ACCEL_PROC_Y |= new_packet.packet_data[3];
data.Accel_Proc_Y = MY_DATA_ACCEL_PROC_Y*0.000183105;
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_ACCEL_PROC_Z (0x5F)
// To convert the register data from a 16-bit 2's complement integer to the actual acceleration in
// gravities, the data should be multiplied by the scale factor 0.000183105 as shown below.
// ACCEL_PROC_Z
MY_DATA_ACCEL_PROC_Z = (int16_t)new_packet.packet_data[4]<<8; //bitshift it
MY_DATA_ACCEL_PROC_Z |= new_packet.packet_data[5];
data.Accel_Proc_Z = MY_DATA_ACCEL_PROC_Z*0.000183105;
} // end if(MY_DATA_ACCEL_PROC)
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_MAG_PROC_XY (0x60)
// To convert the register data from 16-bit 2's complement integers to a unit-norm (assuming proper
// calibration) magnetic-field vector, the data should be multiplied by the scale factor 0.000305176 as
// shown below.
// magnetic field = register_data* 0.000305176
if (new_packet.address == UM6_MAG_PROC_XY) {
// MAG_PROC_X
MY_DATA_MAG_PROC_X = (int16_t)new_packet.packet_data[0]<<8; //bitshift it
MY_DATA_MAG_PROC_X |= new_packet.packet_data[1];
data.Mag_Proc_X = MY_DATA_MAG_PROC_X*0.000305176;
// MAG_PROC_Y
MY_DATA_MAG_PROC_Y = (int16_t)new_packet.packet_data[2]<<8; //bitshift it
MY_DATA_MAG_PROC_Y |= new_packet.packet_data[3];
data.Mag_Proc_Y = MY_DATA_MAG_PROC_Y*0.000305176;
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_MAG_PROC_Z (0x61)
// To convert the register data from 16-bit 2's complement integers to a unit-norm (assuming proper
// calibration) magnetic-field vector, the data should be multiplied by the scale factor 0.000305176 as
// shown below.
// magnetic field = register_data*0.000305176
// MAG_PROC_Z
MY_DATA_MAG_PROC_Z = (int16_t)new_packet.packet_data[4]<<8; //bitshift it
MY_DATA_MAG_PROC_Z |= new_packet.packet_data[5];
data.Mag_Proc_Z = MY_DATA_MAG_PROC_Z*0.000305176;
} // end if(UM6_MAG_PROC)
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_EULER_PHI_THETA (0x62)
// Stores the most recently computed roll (phi) and pitch (theta) angle estimates. The angle
// estimates are stored as 16-bit 2's complement integers. To obtain the actual angle estimate in
// degrees, the register data should be multiplied by the scale factor 0.0109863 as shown below
// angle estimate = register_data* 0.0109863
if (new_packet.address == UM6_EULER_PHI_THETA) {
// EULER_PHI (ROLL)
MY_DATA_EULER_PHI = (int16_t)new_packet.packet_data[0]<<8; //bitshift it
MY_DATA_EULER_PHI |= new_packet.packet_data[1];
data.Roll = MY_DATA_EULER_PHI*0.0109863;
// EULER_THETA (PITCH)
MY_DATA_EULER_THETA = (int16_t)new_packet.packet_data[2]<<8; //bitshift it
MY_DATA_EULER_THETA |= new_packet.packet_data[3];
data.Pitch = MY_DATA_EULER_THETA*0.0109863;
//------------------------------------------------------------
//------------------------------------------------------------
// UM6_EULER_PSI (0x63) (YAW)
// Stores the most recently computed yaw (psi) angle estimate. The angle estimate is stored as a 16-
// bit 2's complement integer. To obtain the actual angle estimate in degrees, the register data
// should be multiplied by the scale factor 0.0109863 as shown below
MY_DATA_EULER_PSI = (int16_t)new_packet.packet_data[4]<<8; //bitshift it
MY_DATA_EULER_PSI |= new_packet.packet_data[5];
data.Yaw = MY_DATA_EULER_PSI*0.0109863;
} // end if(UM6_EULER_PHI_THETA)
//------------------------------------------------------------
} // end if(ADDRESS_TYPE_DATA)
// A full packet has been received.
// Put the USART back into the WAIT state and reset
// the data_counter variable so that it can be used to receive the next packet.
data_counter = 0;
gUSART_State = USART_STATE_WAIT;
} // end else(GET_DATA)
}
break;
} // end switch ( gUSART_State )
return;
} // end get_gyro_x()
#endif
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Repository details
| Type: | Program |
|---|---|
| Mbed OS support: | Mbed 2 deprecated |
| Created: | 09 Jul 2014 |
| Imports: | 7 |
| Forks: | 0 |
| Commits: | 1 |
| Dependents: | 0 |
| Dependencies: | 1 |
| Followers: | 4 |
