NOT FINISHED YET!!! My first try to get a self built fully working Quadrocopter based on an mbed, a self built frame and some other more or less cheap parts.
Sensors/I2C_Sensor.cpp@28:ba6ca9f4def4, 2012-12-01 (annotated)
- Committer:
- maetugr
- Date:
- Sat Dec 01 07:13:04 2012 +0000
- Revision:
- 28:ba6ca9f4def4
- Parent:
- 21:c2a2e7cbabdd
bevor eigener PID
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
maetugr | 14:cf260677ecde | 1 | #include "I2C_Sensor.h" |
maetugr | 14:cf260677ecde | 2 | |
maetugr | 14:cf260677ecde | 3 | // calculate the 8-Bit write/read I2C-Address from the 7-Bit adress of the device |
maetugr | 14:cf260677ecde | 4 | #define GET_I2C_WRITE_ADDRESS(ADR) (ADR << 1&0xFE) // ADR & 1111 1110 |
maetugr | 14:cf260677ecde | 5 | #define GET_I2C_READ_ADDRESS(ADR) (ADR << 1|0x01) // ADR | 0000 0001 |
maetugr | 14:cf260677ecde | 6 | |
maetugr | 21:c2a2e7cbabdd | 7 | I2C_Sensor::I2C_Sensor(PinName sda, PinName scl, char i2c_address) : i2c(sda, scl), local("local") |
maetugr | 14:cf260677ecde | 8 | { |
maetugr | 14:cf260677ecde | 9 | I2C_Sensor::i2c_address = i2c_address; |
maetugr | 20:e116e596e540 | 10 | i2c.frequency(400000); // standard speed |
maetugr | 20:e116e596e540 | 11 | //i2c.frequency(1500000); // ultrafast! |
maetugr | 14:cf260677ecde | 12 | } |
maetugr | 14:cf260677ecde | 13 | |
maetugr | 15:753c5d6a63b3 | 14 | void I2C_Sensor::saveCalibrationValues(float values[], int size, char * filename) |
maetugr | 14:cf260677ecde | 15 | { |
maetugr | 14:cf260677ecde | 16 | FILE *fp = fopen(strcat("/local/", filename), "w"); |
maetugr | 14:cf260677ecde | 17 | for(int i = 0; i < size; i++) |
maetugr | 14:cf260677ecde | 18 | fprintf(fp, "%f\r\n", values[i]); |
maetugr | 14:cf260677ecde | 19 | fclose(fp); |
maetugr | 14:cf260677ecde | 20 | } |
maetugr | 14:cf260677ecde | 21 | |
maetugr | 15:753c5d6a63b3 | 22 | void I2C_Sensor::loadCalibrationValues(float values[], int size, char * filename) |
maetugr | 14:cf260677ecde | 23 | { |
maetugr | 14:cf260677ecde | 24 | FILE *fp = fopen(strcat("/local/", filename), "r"); |
maetugr | 14:cf260677ecde | 25 | for(int i = 0; i < size; i++) |
maetugr | 14:cf260677ecde | 26 | fscanf(fp, "%f", &values[i]); |
maetugr | 14:cf260677ecde | 27 | fclose(fp); |
maetugr | 14:cf260677ecde | 28 | } |
maetugr | 14:cf260677ecde | 29 | |
maetugr | 16:74a6531350b5 | 30 | //-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
maetugr | 16:74a6531350b5 | 31 | // ATTENTION!!! the I2C option "repeated" = true is important because otherwise interrupts while bus communications cause crashes (see http://www.i2c-bus.org/repeated-start-condition/) |
maetugr | 16:74a6531350b5 | 32 | //-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
maetugr | 16:74a6531350b5 | 33 | |
maetugr | 15:753c5d6a63b3 | 34 | char I2C_Sensor::readRegister(char reg) |
maetugr | 15:753c5d6a63b3 | 35 | { |
maetugr | 15:753c5d6a63b3 | 36 | char value = 0; |
maetugr | 15:753c5d6a63b3 | 37 | |
maetugr | 19:40c252b4a792 | 38 | i2c.write(i2c_address, ®, 1, true); |
maetugr | 19:40c252b4a792 | 39 | i2c.read(i2c_address, &value, 1, true); |
maetugr | 15:753c5d6a63b3 | 40 | |
maetugr | 15:753c5d6a63b3 | 41 | return value; |
maetugr | 14:cf260677ecde | 42 | } |
maetugr | 14:cf260677ecde | 43 | |
maetugr | 15:753c5d6a63b3 | 44 | void I2C_Sensor::writeRegister(char reg, char data) |
maetugr | 15:753c5d6a63b3 | 45 | { |
maetugr | 16:74a6531350b5 | 46 | char buffer[2] = {reg, data}; |
maetugr | 19:40c252b4a792 | 47 | i2c.write(i2c_address, buffer, 2, true); |
maetugr | 15:753c5d6a63b3 | 48 | } |
maetugr | 15:753c5d6a63b3 | 49 | |
maetugr | 15:753c5d6a63b3 | 50 | void I2C_Sensor::readMultiRegister(char reg, char* output, int size) |
maetugr | 16:74a6531350b5 | 51 | { |
maetugr | 19:40c252b4a792 | 52 | i2c.write (i2c_address, ®, 1, true); // tell register address of the MSB get the sensor to do slave-transmit subaddress updating. |
maetugr | 19:40c252b4a792 | 53 | i2c.read (i2c_address, output, size, true); // tell it where to store the data read |
maetugr | 14:cf260677ecde | 54 | } |