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LIGHT2
I2C_AS5510/I2C_AS5510.cpp@262:a9507d8a4674, 22 months ago (annotated)
- Committer:
- Lightvalve
- Date:
- Thu Oct 06 07:18:55 2022 +0000
- Revision:
- 262:a9507d8a4674
- Parent:
- 17:1865016ca2e7
Ready to Move to Buyoun's Keil Studio (Pressure_f_cut_20)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
GiJeongKim | 0:51c43836c1d7 | 1 | #include "mbed.h" |
GiJeongKim | 0:51c43836c1d7 | 2 | #include "setting.h" |
GiJeongKim | 0:51c43836c1d7 | 3 | |
GiJeongKim | 0:51c43836c1d7 | 4 | void look_for_hardware_i2c() |
GiJeongKim | 0:51c43836c1d7 | 5 | { |
Lightvalve | 17:1865016ca2e7 | 6 | //pc.printf("\r\n\n\n"); |
Lightvalve | 17:1865016ca2e7 | 7 | //pc.printf("Note I2C address 0x1C used by FXOS8700CQ 3-axis accelerometer and 3-axis magetometer\r\n"); |
Lightvalve | 17:1865016ca2e7 | 8 | //pc.printf("Start hardware search..... \r\n"); |
GiJeongKim | 0:51c43836c1d7 | 9 | |
GiJeongKim | 0:51c43836c1d7 | 10 | int count = 0; |
GiJeongKim | 0:51c43836c1d7 | 11 | for (int address=12; address<256; address+=2) { |
GiJeongKim | 0:51c43836c1d7 | 12 | if (!i2c.write(address, NULL, 0)) { // 0 returned is OK |
Lightvalve | 17:1865016ca2e7 | 13 | //pc.printf(" - I2C device found at address 0x%02X\n\r", address >>1); |
GiJeongKim | 0:51c43836c1d7 | 14 | count++; |
GiJeongKim | 0:51c43836c1d7 | 15 | } |
GiJeongKim | 0:51c43836c1d7 | 16 | } |
Lightvalve | 17:1865016ca2e7 | 17 | //pc.printf("%d devices found \n\r", count); |
GiJeongKim | 0:51c43836c1d7 | 18 | } |
GiJeongKim | 0:51c43836c1d7 | 19 | |
GiJeongKim | 0:51c43836c1d7 | 20 | void init_as5510(int i2c_address) |
GiJeongKim | 0:51c43836c1d7 | 21 | { |
GiJeongKim | 0:51c43836c1d7 | 22 | int i2c_adrs=0; |
GiJeongKim | 0:51c43836c1d7 | 23 | char idata[2]; |
GiJeongKim | 0:51c43836c1d7 | 24 | int result=0; |
GiJeongKim | 0:51c43836c1d7 | 25 | |
Lightvalve | 17:1865016ca2e7 | 26 | //pc.printf("\r\n"); |
Lightvalve | 17:1865016ca2e7 | 27 | //pc.printf("Start AS5510 init.. \r\n"); |
GiJeongKim | 0:51c43836c1d7 | 28 | |
GiJeongKim | 0:51c43836c1d7 | 29 | i2c_adrs= (i2c_address << 1); // AS5510 Slave address lsb= 0 for write |
GiJeongKim | 0:51c43836c1d7 | 30 | |
GiJeongKim | 0:51c43836c1d7 | 31 | //---------- Magnet selection -------------------------------- |
GiJeongKim | 0:51c43836c1d7 | 32 | //----0x00= <50mT-----------Strong magnet |
GiJeongKim | 0:51c43836c1d7 | 33 | //----0x01= <25mT |
GiJeongKim | 0:51c43836c1d7 | 34 | //----0x02= <18.7mT |
GiJeongKim | 0:51c43836c1d7 | 35 | //----0x03= <12.5mT---------Weak magnet |
GiJeongKim | 0:51c43836c1d7 | 36 | //----------------------------------------------------------- |
GiJeongKim | 0:51c43836c1d7 | 37 | idata[0]=0x0B; // Register for Sensitivity |
GiJeongKim | 0:51c43836c1d7 | 38 | idata[1]=0x00; // Byte |
GiJeongKim | 0:51c43836c1d7 | 39 | result= i2c.write(i2c_adrs, idata, 2, 0); // Now write_sensitivity |
Lightvalve | 17:1865016ca2e7 | 40 | // if (result != 0) pc.printf("No ACK bit! (09)\n\r"); |
GiJeongKim | 0:51c43836c1d7 | 41 | |
GiJeongKim | 0:51c43836c1d7 | 42 | //----------- Operation mode selection------------------------ |
GiJeongKim | 0:51c43836c1d7 | 43 | idata[0]=0x02; // 0x02 address setup register for operation, speed, polarity |
GiJeongKim | 0:51c43836c1d7 | 44 | idata[1]=0x04; // Normal Operation, Slow mode (1), NORMAL Polarity (0), Power Up (0) |
GiJeongKim | 0:51c43836c1d7 | 45 | result= i2c.write(i2c_adrs, idata, 2, 0); // Now write_operation |
Lightvalve | 17:1865016ca2e7 | 46 | // if (result != 0) pc.printf("No ACK bit! (11)\n\r"); |
GiJeongKim | 0:51c43836c1d7 | 47 | |
Lightvalve | 17:1865016ca2e7 | 48 | //pc.printf("AS5510 init done\r\n"); |
GiJeongKim | 0:51c43836c1d7 | 49 | } |
GiJeongKim | 0:51c43836c1d7 | 50 | |
GiJeongKim | 0:51c43836c1d7 | 51 | |
GiJeongKim | 0:51c43836c1d7 | 52 | int offset_comp(int i2c_address) |
GiJeongKim | 0:51c43836c1d7 | 53 | { |
GiJeongKim | 0:51c43836c1d7 | 54 | int adrss=0; |
GiJeongKim | 0:51c43836c1d7 | 55 | int oresult=0; |
GiJeongKim | 0:51c43836c1d7 | 56 | char off_data[2]; |
GiJeongKim | 0:51c43836c1d7 | 57 | int ocf_done=0; |
GiJeongKim | 0:51c43836c1d7 | 58 | |
GiJeongKim | 0:51c43836c1d7 | 59 | // First, now Write pointer to register 0x00---------------------------- |
GiJeongKim | 0:51c43836c1d7 | 60 | adrss= (i2c_address << 1); // AS5510 Slave address lsb= 0 for write |
GiJeongKim | 0:51c43836c1d7 | 61 | oresult= i2c.write(adrss, 0x00, 1, 0); // write one byte |
Lightvalve | 17:1865016ca2e7 | 62 | if (oresult != 0) //pc.printf("No ACK bit! (33)\n\r"); |
GiJeongKim | 0:51c43836c1d7 | 63 | |
GiJeongKim | 0:51c43836c1d7 | 64 | // Second, now Read register 0x00 and 0x01-------------------------------- |
GiJeongKim | 0:51c43836c1d7 | 65 | memset(off_data, 0, sizeof(off_data)); |
GiJeongKim | 0:51c43836c1d7 | 66 | adrss= (i2c_address << 1) | 0x01; // AS5510 address lsb= 1 for read |
GiJeongKim | 0:51c43836c1d7 | 67 | oresult= i2c.read(adrss, off_data, 2, 0); // read two bytes |
GiJeongKim | 0:51c43836c1d7 | 68 | |
GiJeongKim | 0:51c43836c1d7 | 69 | // Now analyse register 0x01 ---------------------------------------------- |
GiJeongKim | 0:51c43836c1d7 | 70 | ocf_done= off_data[1] & 0x08; // mask off bits, 1= done |
GiJeongKim | 0:51c43836c1d7 | 71 | if (ocf_done== 0) return(0); // return(0)= compensation process is pending |
GiJeongKim | 0:51c43836c1d7 | 72 | else return(1); // return(1)= compensation process is completed |
GiJeongKim | 0:51c43836c1d7 | 73 | } |
GiJeongKim | 0:51c43836c1d7 | 74 | |
GiJeongKim | 0:51c43836c1d7 | 75 | |
GiJeongKim | 0:51c43836c1d7 | 76 | void read_field(int i2c_address) |
GiJeongKim | 0:51c43836c1d7 | 77 | { |
GiJeongKim | 0:51c43836c1d7 | 78 | int adr=0; |
GiJeongKim | 0:51c43836c1d7 | 79 | char rx_data[2]; |
GiJeongKim | 0:51c43836c1d7 | 80 | int rresult=0; |
GiJeongKim | 0:51c43836c1d7 | 81 | char lsb, msb; |
GiJeongKim | 0:51c43836c1d7 | 82 | |
GiJeongKim | 0:51c43836c1d7 | 83 | // First, now Write pointer to register 0x00---------------------------- |
GiJeongKim | 0:51c43836c1d7 | 84 | adr= (i2c_address << 1); // AS5510 address lsb= 0 for write |
GiJeongKim | 0:51c43836c1d7 | 85 | rresult= i2c.write(adr, 0x00, 1, 0); // write one byte to register 0x00 for magnetic field strength |
GiJeongKim | 0:51c43836c1d7 | 86 | // if (rresult != 0) pc.printf("No ACK bit! (22)\n\r"); |
GiJeongKim | 0:51c43836c1d7 | 87 | |
GiJeongKim | 0:51c43836c1d7 | 88 | // Second, now Read register 0x00 and 0x01-------------------------------- |
GiJeongKim | 0:51c43836c1d7 | 89 | memset(rx_data, 0, sizeof(rx_data)); |
GiJeongKim | 0:51c43836c1d7 | 90 | adr= (i2c_address << 1) | 0x01; // AS5510 address lsb= 1 for read |
GiJeongKim | 0:51c43836c1d7 | 91 | rresult= i2c.read(adr, rx_data, 2, 0); // read two bytes |
GiJeongKim | 0:51c43836c1d7 | 92 | |
GiJeongKim | 0:51c43836c1d7 | 93 | |
GiJeongKim | 0:51c43836c1d7 | 94 | // Now analyse register 0x01 ---------------------------------------------- |
GiJeongKim | 0:51c43836c1d7 | 95 | lsb= rx_data[0]; // get LSB |
GiJeongKim | 0:51c43836c1d7 | 96 | msb= rx_data[1]&0x03; // need only 2 low bits og MSB |
GiJeongKim | 0:51c43836c1d7 | 97 | value = ((msb & 0x03)<<8) + lsb; |
GiJeongKim | 0:51c43836c1d7 | 98 | // pc.printf("I2C adres= 0x%02X, Magnetic Field => msb= 0x%02X, lsb= 0x%02X, decimal 10-bit value = %u \r\n ", i2c_address, rx_data[0],rx_data[1], value); |
Lightvalve | 17:1865016ca2e7 | 99 | |
GiJeongKim | 0:51c43836c1d7 | 100 | } |