annotate include/I2c.h @ 45:579c86316008
newapi
Major API overhaul. Moved to a single data structure for handling render functions. Functionally, generally similar except for scheduling within PRU loop function, which now uses interrupts from the PRU rather than polling. This requires an updated kernel.
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andrewm |
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Thu, 28 May 2015 14:35:55 -0400 |
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8a575ba3ab52 |
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line source |
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1 /*
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2 * I2c.h
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3 *
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4 * Created on: Oct 14, 2013
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5 * Author: Victor Zappi
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6 */
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7
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8 #ifndef I2C_H_
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9 #define I2C_H_
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10
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11 #include <iostream>
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12 #include <iomanip>
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13 #include <string>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <unistd.h>
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17 #include <fcntl.h>
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18 #include <linux/i2c.h>
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19 #include <linux/i2c-dev.h>
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20 #include <sys/ioctl.h>
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21 #include <stropts.h>
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22
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23 #define MAX_BUF_NAME 64
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24
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25 using namespace std;
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26
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27
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28 class I2c
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29 {
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30
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31 protected:
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32 int i2C_bus;
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33 int i2C_address;
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34 int i2C_file;
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35
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36 public:
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37 int initI2C_RW(int bus, int address, int file);
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38 virtual int readI2C() = 0;
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39 int closeI2C();
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40
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41 virtual ~I2c();
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42
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43 };
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44
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45
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46 inline int I2c::initI2C_RW(int bus, int address, int fileHnd)
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47 {
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48 i2C_bus = bus;
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49 i2C_address = address;
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50 i2C_file = fileHnd;
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51
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52 // open I2C device as a file
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53 char namebuf[MAX_BUF_NAME];
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54 snprintf(namebuf, sizeof(namebuf), "/dev/i2c-%d", i2C_bus);
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55
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56 if ((i2C_file = open(namebuf, O_RDWR)) < 0)
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57 {
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58 cout << "Failed to open " << namebuf << " I2C Bus" << endl;
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59 return(1);
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60 }
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61
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62 // target device as slave
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63 if (ioctl(i2C_file, I2C_SLAVE, i2C_address) < 0){
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64 cout << "I2C_SLAVE address " << i2C_address << " failed..." << endl;
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65 return(2);
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66 }
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67
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68 return 0;
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69 }
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70
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71
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72
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73 inline int I2c::closeI2C()
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74 {
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75 if(close(i2C_file)>0)
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76 {
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77 cout << "Failed to close file "<< i2C_file << endl;
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78 return 1;
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79 }
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80 return 0;
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81 }
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82
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83
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84 inline I2c::~I2c(){}
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85
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86
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87 #endif /* I2C_H_ */
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