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1 #include <stdio.h> |
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2 #include <stdint.h> |
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3 #include <stdlib.h> |
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4 #include <string.h> |
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5 #include <errno.h> |
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6 #include <unistd.h> |
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7 #include <sys/types.h> |
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8 #include <sys/stat.h> |
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9 #include <sys/ioctl.h> |
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10 #include <fcntl.h> |
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11 #include <linux/i2c-dev.h> |
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12 |
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13 #include <epicsExport.h> |
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14 #include <dbAccess.h> |
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15 #include <devSup.h> |
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16 #include <recGbl.h> |
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17 |
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18 #include <aiRecord.h> |
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19 |
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20 // ADCPi definitions |
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21 #define ADC_1 0x68 |
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22 #define ADC_2 0x69 |
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23 #define ADC_CHANNEL1 0x98 |
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24 #define ADC_CHANNEL2 0xB8 |
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25 #define ADC_CHANNEL3 0xD8 |
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26 #define ADC_CHANNEL4 0xF8 |
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27 |
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28 |
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29 static long init_record(aiRecord *pai); |
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30 static long read_ai(aiRecord *pai); |
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31 |
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32 struct adcPiChannel { |
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33 unsigned int channel; |
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34 }; |
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35 |
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36 |
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37 int getadc (int chn){ |
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38 unsigned int fh,dummy, adc, adc_channel; |
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39 // double val; |
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40 __u8 res[4]; |
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41 printf(" Read channel Nr: %d\n", chn); |
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42 switch (chn){ |
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43 case 1: { adc=ADC_1; adc_channel=ADC_CHANNEL1; }; break; |
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44 case 2: { adc=ADC_1; adc_channel=ADC_CHANNEL2; }; break; |
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45 case 3: { adc=ADC_1; adc_channel=ADC_CHANNEL3; }; break; |
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46 case 4: { adc=ADC_1; adc_channel=ADC_CHANNEL4; }; break; |
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47 case 5: { adc=ADC_2; adc_channel=ADC_CHANNEL1; }; break; |
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48 case 6: { adc=ADC_2; adc_channel=ADC_CHANNEL2; }; break; |
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49 case 7: { adc=ADC_2; adc_channel=ADC_CHANNEL3; }; break; |
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50 case 8: { adc=ADC_2; adc_channel=ADC_CHANNEL4; }; break; |
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51 default: { adc=ADC_1; adc_channel=ADC_CHANNEL1; }; break; |
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52 } |
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53 fh = open("/dev/i2c-1", O_RDWR); |
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54 ioctl(fh,I2C_SLAVE,adc); |
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55 i2c_smbus_write_byte (fh, adc_channel); |
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56 usleep (50000); |
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57 i2c_smbus_read_i2c_block_data(fh,adc_channel,4,res); |
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58 usleep(50000); |
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59 close (fh); |
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60 dummy = (res[0]<<8|res[1]); |
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61 if (dummy>=32768) dummy=65536-dummy; |
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62 //val = dummy * 0.000154; |
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63 // printf(" dummy = %d, val = %lf\n", dummy, val); |
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64 //return val; |
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65 return dummy; |
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66 } |
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67 |
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68 static long init_record(aiRecord *pai) |
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69 { |
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70 struct adcPiChannel* priv; |
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71 unsigned long channel; |
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72 |
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73 priv=malloc(sizeof(struct adcPiChannel)); |
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74 if(!priv){ |
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75 recGblRecordError(S_db_noMemory, (void*)pai, |
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76 "devAoTimebase failed to allocate private struct"); |
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77 return S_db_noMemory; |
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78 } |
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79 |
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80 recGblInitConstantLink(&pai->inp,DBF_ULONG,&channel); |
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81 |
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82 priv->channel=channel; |
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83 pai->dpvt=priv; |
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84 |
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85 return 0; |
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86 } |
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87 |
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88 |
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89 static long read_ai(aiRecord *pai) |
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90 { |
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91 struct adcPiChannel* priv=pai->dpvt; |
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92 |
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93 pai->rval = getadc(priv->channel); |
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94 |
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95 return 0; |
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96 } |
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97 |
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98 struct { |
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99 long num; |
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100 DEVSUPFUN report; |
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101 DEVSUPFUN init; |
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102 DEVSUPFUN init_record; |
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103 DEVSUPFUN get_ioint_info; |
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104 DEVSUPFUN read_ai; |
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105 DEVSUPFUN special_linconv; |
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106 } devAiAdcPi = { |
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107 6, /* space for 6 functions */ |
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108 NULL, |
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109 NULL, |
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110 init_record, |
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111 NULL, |
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112 read_ai, |
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113 NULL |
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114 }; |
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115 |
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116 epicsExportAddress(dset,devAiAdcPi); |
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117 |