most functionality to splashdwon, find neutral and start mission. short timeouts still in code for testing, will adjust to go directly to sit_idle after splashdown
Dependencies: mbed MODSERIAL FATFileSystem
Diff: IMU/IMU.cpp
- Revision:
- 11:3b241ecb75ed
- Parent:
- 10:085ab7328054
--- a/IMU/IMU.cpp Mon Oct 23 12:50:53 2017 +0000 +++ b/IMU/IMU.cpp Fri Oct 27 00:37:32 2017 +0000 @@ -30,7 +30,7 @@ // this stops an interval timer trigger of the IMU update function void IMU::start() { - interval.attach(this, &IMU::update, 1); //this should be a 1 Hz sample rate + interval.attach(this, &IMU::update, .05); //this should be a 1 Hz sample rate } // this stops the interval timer trigger of the IMU update function @@ -40,6 +40,14 @@ // updated the imu update function with a state machine that doesn't hang if no data is present void IMU::update() { + +// // DEBUGGING an example packet +// Serial pc(USBTX, USBRX); +// //char data[20] = {0x75,0x65,0x80,0x0E,0x0E,0x04,0x3E,0x7A,0x63,0xA0,0xBB,0x8E,0x3B,0x29,0x7F,0xE5,0xBF,0x7F,0x84,0xEE}; // 3d accel +// char data[20] = {0x75,0x65,0x80,0x0E,0x0E,0x0C,0xBA,0xE3,0xED,0x9B,0x3C,0x7D,0x6D,0xDF,0xBF,0x85,0x5C,0xF5,0x41,0xBB}; // euler cf +// for (int j=0; j<20; j++) { + //byte = data[j]; + while (_rs232.readable()) { // read a single byte byte = _rs232.getc(); @@ -48,60 +56,69 @@ switch (state) { case SYNC0 : if (byte == 0x75) { + packet[0] = byte; // save into the packet state = SYNC1; } break; case SYNC1 : if (byte == 0x65) { + packet[1] = byte; // save into the packet state = SET; } - state = SYNC0; + else { + state = SYNC0; + } break; case SET : descriptor = byte; // save descriptor set + packet[2] = byte; // save into the packet state = LEN; break; case LEN : len = byte; // save payload length + packet[3] = byte; // save into the packet state = PAY; - i = 0; // reset payload length counter + i = 0; // reset payload field length counter break; case PAY : - if (i < len) { - payload[i] = byte; // add byte to the payload array + if (i < len) { // keep adding until get all the payload length + packet[4+i] = byte; // add byte to the packet, skipping over the header 4-bytes i++; // increment payload counter } else { state = CRC0; } + if (i >= len) { // not an elseif, since we want to escape when i==len + state = CRC0; + } break; case CRC0 : - crc0 = byte; + crc0 = byte; // save the msb of the checksum state = CRC1; break; case CRC1 : - crc1 = byte; - checksum = crc0<<8 + crc1; // make checksum - if (checksum == calcChecksum(payload, len)) { - processPacket(descriptor, len, payload); // process packet + crc1 = byte; // save the lsb of the checksum + checksum = ((unsigned int)crc0 << 8) + (unsigned int)crc1; // make checksum into a uint16 + if (checksum == calcChecksum(packet, len+4)) { // passed checksum, wahoo! + processPayload(descriptor, packet[4], &packet[4]); // process the payload part of the packet, starting at byte 4 } state = SYNC0; // reset to SYNC0 state break; default : - state = SYNC0; + state = SYNC0; } } return; } -void IMU::processPacket(char descriptor, char length, unsigned char * payload) { +void IMU::processPayload(char descriptor, char length, unsigned char * payload) { if (descriptor == IMU_DATA_SET) { // find an IMU data descriptor set if (length > 2) { // make sure there are at least two bytes to see the field descriptor if (payload[1] == EULER_CF_DESCRIPTOR) { // find an euler CF field descriptor @@ -124,9 +141,9 @@ void IMU::processEulerCfPacket(char length, unsigned char * payload) { if (length >= EULER_CF_LENGTH) { // make sure correct field length if (payload[0] == EULER_CF_LENGTH) { // make sure field length is as expected - euler[0] = floatFromChar(&payload[ROLL_OFFSET])*180/_PI; // roll Euler angle convert in degrees - euler[1] = floatFromChar(&payload[PITCH_OFFSET])*180/_PI; // pitch Euler angle convert in degrees - euler[2] = floatFromChar(&payload[YAW_OFFSET])*180/_PI; // yaw Euler angle convert in degrees + euler[0] = floatFromChar(&payload[ROLL_OFFSET+2])*180/_PI; // roll Euler angle convert in degrees + euler[1] = floatFromChar(&payload[PITCH_OFFSET+2])*180/_PI; // pitch Euler angle convert in degrees + euler[2] = floatFromChar(&payload[YAW_OFFSET+2])*180/_PI; // yaw Euler angle convert in degrees } } } @@ -134,19 +151,19 @@ void IMU::processLatLonAltPacket(char length, unsigned char * payload) { if (length >= LLH_POSITION_LENGTH) { // make sure correct field length if (payload[0] == LLH_POSITION_LENGTH) { // make sure field length is as expected - latLonAlt[0] = doubleFromChar(&payload[LATITUDE_OFFSET]); // latitude in decimal degrees - latLonAlt[1] = doubleFromChar(&payload[LONGITUDE_OFFSET]); // longitude in decimal degrees - latLonAlt[2] = doubleFromChar(&payload[HEIGHT_MSL_OFFSET]); // altitude above mean sea level in meters + latLonAlt[0] = doubleFromChar(&payload[LATITUDE_OFFSET+2]); // latitude in decimal degrees + latLonAlt[1] = doubleFromChar(&payload[LONGITUDE_OFFSET+2]); // longitude in decimal degrees + latLonAlt[2] = doubleFromChar(&payload[HEIGHT_MSL_OFFSET+2]); // altitude above mean sea level in meters } } } -void IMU::processGnssFixInformation(char length, unsigned char * data) { +void IMU::processGnssFixInformation(char length, unsigned char * payload) { if (length >= GNSS_FIX_INFO_LENGTH) { // make sure field length is as expected if (payload[0] == GNSS_FIX_INFO_LENGTH) { // make sure field length is as expected - is2dFixValid = char(payload[FIX_TYPE_OFFSET]) & 0x01; // bitand on LSB to see 2d fix flag - is3dFixValid = char(payload[FIX_TYPE_OFFSET]) & 0x02; // bitand on LSB to see 3d fix flag - numSV = char(payload[NUM_SV_OFFSET]); // number of GNSS satellite vehicles + is2dFixValid = char(payload[FIX_TYPE_OFFSET+2]) & 0x01; // bitand on LSB to see 2d fix flag + is3dFixValid = char(payload[FIX_TYPE_OFFSET+2]) & 0x02; // bitand on LSB to see 3d fix flag + numSV = char(payload[NUM_SV_OFFSET+2]); // number of GNSS satellite vehicles } } } @@ -212,11 +229,12 @@ unsigned int IMU::calcChecksum(unsigned char * mip_packet, char checksum_range) { unsigned char checksum_byte1 = 0; unsigned char checksum_byte2 = 0; + unsigned int myChecksum = 0; for (int i=0; i<checksum_range; i++) { checksum_byte1 += mip_packet[i]; checksum_byte2 += checksum_byte1; } - checksum = ((unsigned int)checksum_byte1 << 8) + (unsigned int)checksum_byte2; - return checksum; + myChecksum = ((unsigned int)checksum_byte1 << 8) + (unsigned int)checksum_byte2; + return myChecksum; } \ No newline at end of file