JEK changes enabling proper recording of IMU/GPS datastrams - 02-APR-2013
Fork of GPS_Incremental by
ADIS16488.h@9:b45feb91ba38, 2013-04-19 (annotated)
- Committer:
- jekain314
- Date:
- Fri Apr 19 16:21:27 2013 +0000
- Revision:
- 9:b45feb91ba38
- Parent:
- 6:2a8486283198
update to allow better imu gps data collection
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dannyman939 | 0:c746ee34feae | 1 | |
dannyman939 | 0:c746ee34feae | 2 | |
dannyman939 | 0:c746ee34feae | 3 | |
dannyman939 | 0:c746ee34feae | 4 | //set up the SPI on pins 5, 6, 7 to read from the ADIS16488 |
dannyman939 | 0:c746ee34feae | 5 | SPI spi(p5, p6, p7); // mosi (DIN), miso (DOUT), sclk (CLK) |
dannyman939 | 0:c746ee34feae | 6 | DigitalOut ADIS_CS(p8); //Chip Select for the ADIS SPI |
dannyman939 | 0:c746ee34feae | 7 | InterruptIn ADIS_DR(p28); //DataReady interrupt connected to DIO2 for ADIS |
dannyman939 | 0:c746ee34feae | 8 | DigitalOut ADIS_RST(p20); //ADIS reset pin |
dannyman939 | 0:c746ee34feae | 9 | |
dannyman939 | 0:c746ee34feae | 10 | bool IMUDataReady = false; |
dannyman939 | 0:c746ee34feae | 11 | int IMURecordCounter = 0; |
dannyman939 | 0:c746ee34feae | 12 | //see Table 9 from page 11 of the ADIS16488 spec |
dannyman939 | 0:c746ee34feae | 13 | //see fig 15 of spec -- note the low byte of the regsiter word is always zero |
dannyman939 | 0:c746ee34feae | 14 | // X_DELTANG_LOW, Y_DELTANG_LOW, X_DETANG_LOW, X_DELTVEL_LOW, Y_DELTVEL_LOW, Z_DELTVEL_LOW |
dannyman939 | 0:c746ee34feae | 15 | unsigned short LOW_REGISTER[] = {0x4000, 0x4400, 0x4800, 0x4C00, 0x5000, 0x5400}; |
dannyman939 | 0:c746ee34feae | 16 | // X_DELTANG_HIGH, Y_DELTANG_HIGH, X_DETANG_HIGH, X_DELTVEL_HIGH, Y_DELTVEL_HIGH, Z_DELTVEL_HIGH |
dannyman939 | 0:c746ee34feae | 17 | unsigned short HIGH_REGISTER[] = {0x4200, 0x4600, 0x4A00, 0x4E00, 0x5200, 0x5600}; |
jekain314 | 9:b45feb91ba38 | 18 | |
jekain314 | 9:b45feb91ba38 | 19 | unsigned long IMUtimeFrom1PPS = 0; |
dannyman939 | 0:c746ee34feae | 20 | |
dannyman939 | 0:c746ee34feae | 21 | union WD { long dataWord; unsigned short pt[2];} wd; |
dannyman939 | 0:c746ee34feae | 22 | |
dannyman939 | 0:c746ee34feae | 23 | #pragma pack(1) |
dannyman939 | 0:c746ee34feae | 24 | struct IMUREC |
dannyman939 | 0:c746ee34feae | 25 | { |
dannyman939 | 0:c746ee34feae | 26 | unsigned long synch; |
jekain314 | 6:2a8486283198 | 27 | unsigned short msgID; |
jekain314 | 6:2a8486283198 | 28 | unsigned long GPSTime; |
dannyman939 | 0:c746ee34feae | 29 | long dataWord[6]; |
jekain314 | 6:2a8486283198 | 30 | // 4 + 2 + 4 + 24 = 34 |
dannyman939 | 0:c746ee34feae | 31 | } imuRec; |
dannyman939 | 0:c746ee34feae | 32 | |
dannyman939 | 0:c746ee34feae | 33 | void IMUDataReadyISR(void) |
dannyman939 | 0:c746ee34feae | 34 | { |
jekain314 | 9:b45feb91ba38 | 35 | //IMUtimeFrom1PPS = timeFromPPS.read_us(); |
jekain314 | 9:b45feb91ba38 | 36 | IMUClockCounter++; |
jekain314 | 4:68268737ff89 | 37 | IMUDataReady = true; |
dannyman939 | 0:c746ee34feae | 38 | return; |
dannyman939 | 0:c746ee34feae | 39 | } |
dannyman939 | 0:c746ee34feae | 40 | |
dannyman939 | 0:c746ee34feae | 41 | void setupADIS(void) |
dannyman939 | 0:c746ee34feae | 42 | { |
dannyman939 | 0:c746ee34feae | 43 | ADIS_DR.mode(PullDown); |
dannyman939 | 0:c746ee34feae | 44 | ADIS_RST = 0; |
dannyman939 | 0:c746ee34feae | 45 | |
dannyman939 | 0:c746ee34feae | 46 | // set the IMU dataReady ISR |
dannyman939 | 0:c746ee34feae | 47 | ADIS_DR.rise(&IMUDataReadyISR); |
dannyman939 | 0:c746ee34feae | 48 | |
dannyman939 | 0:c746ee34feae | 49 | // Setup the mbed SPI for 16 bit data, high steady state clock, |
dannyman939 | 0:c746ee34feae | 50 | // second edge capture, with a 1MHz clock rate |
dannyman939 | 0:c746ee34feae | 51 | spi.format(16,3); |
dannyman939 | 0:c746ee34feae | 52 | spi.frequency(1000000); |
dannyman939 | 0:c746ee34feae | 53 | |
dannyman939 | 0:c746ee34feae | 54 | ADIS_CS = 1; //CS must be set high before it goes low cause the enable is the transition |
dannyman939 | 0:c746ee34feae | 55 | ADIS_RST = 1; |
dannyman939 | 0:c746ee34feae | 56 | wait(0.5); |
dannyman939 | 0:c746ee34feae | 57 | ADIS_CS = 0; //set the Chip select low to enable the IMU SPI access |
dannyman939 | 0:c746ee34feae | 58 | |
dannyman939 | 0:c746ee34feae | 59 | spi.write((int)0x8003); //change to page 3 |
dannyman939 | 0:c746ee34feae | 60 | |
dannyman939 | 0:c746ee34feae | 61 | //change the DECRATE to 98.4 Hz (this is also in page 3) |
dannyman939 | 0:c746ee34feae | 62 | //the 8 sets the high bit to 1 indicating a write to a register |
dannyman939 | 0:c746ee34feae | 63 | // The C abd D designate the registers for the DECRATE of Page 3 |
jekain314 | 9:b45feb91ba38 | 64 | // The 0x17 sets the rate to: 2460/(23+1) = 102.5Hz |
jekain314 | 9:b45feb91ba38 | 65 | // The 0x18 sets the rate to: 2460/(24+1) = 98.4Hz |
dannyman939 | 0:c746ee34feae | 66 | spi.write((int)0x8C17); //write high byte (only page number can be written in a single byte) |
dannyman939 | 0:c746ee34feae | 67 | spi.write((int)0x8D00); //write the low byte of DECRATE |
dannyman939 | 0:c746ee34feae | 68 | |
dannyman939 | 0:c746ee34feae | 69 | //to set the GPS VARF clock as the input synch clock for the IMU |
dannyman939 | 0:c746ee34feae | 70 | //the high byte is CD indicating the synch is enabled on the rising edge of the input clock |
dannyman939 | 0:c746ee34feae | 71 | //spi.write((int)0x86CD); //write high byte to register 0x06 |
dannyman939 | 0:c746ee34feae | 72 | //spi.write((int)0x8700); //write the low byte of 00 to registed 0x07 |
dannyman939 | 0:c746ee34feae | 73 | |
dannyman939 | 0:c746ee34feae | 74 | //change the page to 0 to get the data |
dannyman939 | 0:c746ee34feae | 75 | spi.write((int)0x8000); //change to page 0 |
dannyman939 | 0:c746ee34feae | 76 | |
jekain314 | 6:2a8486283198 | 77 | toPC.printf(" setting the default values\n"); |
jekain314 | 6:2a8486283198 | 78 | |
dannyman939 | 0:c746ee34feae | 79 | //set the IMU synch and message ID |
jekain314 | 6:2a8486283198 | 80 | imuRec.synch = 0x1C1244AA; //same as the GPS synch words |
jekain314 | 6:2a8486283198 | 81 | |
dannyman939 | 0:c746ee34feae | 82 | imuRec.msgID=111; //IMU record ID |
jekain314 | 6:2a8486283198 | 83 | |
jekain314 | 6:2a8486283198 | 84 | toPC.printf(" finished setting the default values\n"); |
jekain314 | 6:2a8486283198 | 85 | |
dannyman939 | 0:c746ee34feae | 86 | } |