1 | /* repeat.c Demonstration program for WinSystems PCM-MIO Driver */ |
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2 | |
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3 | /* |
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4 | * |
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5 | * $Header$ |
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6 | * |
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7 | * $Id$ |
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8 | * |
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9 | * $Log$ |
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10 | * |
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11 | * Compile with : |
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12 | * |
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13 | * gcc repeat.c kbhit.c mio_io.o -o repeat |
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14 | * |
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15 | * |
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16 | * This program demonstrates the adc_convert_single_repeated function |
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17 | * which allows for a sequence of conversions to be accomplished |
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18 | * with a single call on the same channel. |
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19 | * |
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20 | */ |
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21 | |
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22 | #include "mio_io.h" |
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23 | |
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24 | #include <stdio.h> |
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25 | #include <fcntl.h> /* open */ |
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26 | #include <unistd.h> /* exit */ |
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27 | #include <sys/ioctl.h> /* ioctl */ |
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28 | #include <stdlib.h> |
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29 | #include <pthread.h> |
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30 | |
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31 | // This array will store the results of 2000 conversions |
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32 | |
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33 | unsigned short values[2000]; |
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34 | volatile unsigned long count = 0; |
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35 | |
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36 | void *thread_function(void *arg); |
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37 | void *thread_function2(void *arg); |
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38 | |
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39 | /* Event count, counts the number of events we've handled */ |
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40 | |
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41 | volatile int exit_flag = 0; |
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42 | |
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43 | void init_keyboard(void); |
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44 | void close_keyboard(void); |
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45 | int kbhit(void); |
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46 | int readch(void); |
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47 | |
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48 | |
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49 | int main(int argc, char* argv[]) |
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50 | { |
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51 | int channel = 0; |
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52 | unsigned short result; |
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53 | float min,max,current; |
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54 | int x,c; |
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55 | int res; |
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56 | int res2; |
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57 | pthread_t a_thread; |
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58 | pthread_t b_thread; |
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59 | |
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60 | // We'll keep track of the minimum and maximum voltage values |
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61 | // we see on a channel as well as the count of conversions |
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62 | // completed. |
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63 | |
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64 | max = -10.0; |
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65 | min = 10.0; |
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66 | count = 0; |
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67 | |
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68 | // The default channel is 0 but an alternate channel can be specified |
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69 | // as a command line argument. |
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70 | |
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71 | if(argc > 1) |
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72 | channel = atoi(argv[1]); |
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73 | |
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74 | // Check for a valid channel number. Abort if bad |
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75 | |
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76 | if(channel <0 || channel > 15) |
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77 | { |
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78 | printf("Channel numbers must be between 0 and 15 - Aborting\n"); |
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79 | exit(0); |
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80 | } |
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81 | |
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82 | // This call sets the mode for the specified channel. We are going to |
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83 | // set up for single-ended +/- 10 V range. That way any legal input |
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84 | // can be accomodated. |
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85 | |
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86 | adc_set_channel_mode(channel,ADC_SINGLE_ENDED,ADC_BIPOLAR,ADC_TOP_10V); |
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87 | |
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88 | if(mio_error_code) |
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89 | { |
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90 | printf("\nError occured - %s\n",mio_error_string); |
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91 | exit(1); |
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92 | } |
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93 | |
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94 | /* Enable interrupts on both controllers */ |
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95 | |
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96 | enable_adc_interrupt(0); |
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97 | enable_adc_interrupt(1); |
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98 | |
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99 | if(mio_error_code) |
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100 | { |
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101 | printf("\nError occured - %s\n",mio_error_string); |
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102 | exit(1); |
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103 | } |
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104 | |
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105 | |
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106 | res = pthread_create(&a_thread,NULL,thread_function,NULL); |
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107 | |
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108 | if(res != 0) |
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109 | { |
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110 | perror("Thread 1 creation failed"); |
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111 | exit(EXIT_FAILURE); |
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112 | } |
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113 | |
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114 | |
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115 | res2 = pthread_create(&b_thread,NULL,thread_function2,NULL); |
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116 | |
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117 | if(res != 0) |
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118 | { |
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119 | perror("Thread 2 creation failed"); |
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120 | exit(EXIT_FAILURE); |
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121 | } |
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122 | |
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123 | |
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124 | |
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125 | init_keyboard(); |
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126 | |
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127 | while(1) |
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128 | { |
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129 | // We'll keep running until a recognized key is pressed |
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130 | if(kbhit()) |
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131 | { |
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132 | c = readch(); |
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133 | |
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134 | // The 'C' key clears the min/max and count values |
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135 | |
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136 | if(c== 'c' || c == 'C') |
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137 | { |
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138 | count = 0; |
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139 | min = 10.0; |
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140 | max = -10.0; |
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141 | } |
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142 | |
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143 | // The 'N' key moves to the next channel, wrapping from 15 |
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144 | // back to 0 when appropriate. |
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145 | |
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146 | else if(c == 'n' || c == 'N') |
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147 | { |
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148 | printf("\n"); |
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149 | channel++; |
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150 | if(channel > 15) |
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151 | channel = 0; |
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152 | |
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153 | // When we change channels we need to make sure we set |
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154 | // the channel's mode to a valid range. |
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155 | |
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156 | adc_set_channel_mode(channel,ADC_SINGLE_ENDED,ADC_BIPOLAR,ADC_TOP_10V); |
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157 | if(mio_error_code) |
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158 | { |
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159 | printf("\nError occured - %s\n",mio_error_string); |
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160 | exit(1); |
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161 | } |
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162 | |
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163 | // A new channel also clears the count and min/max values. |
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164 | |
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165 | count = 0; |
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166 | min = 10.0; |
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167 | max = -10.0; |
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168 | } |
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169 | else |
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170 | { |
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171 | disable_adc_interrupt(0); |
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172 | disable_adc_interrupt(1); |
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173 | pthread_cancel(a_thread); |
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174 | exit_flag = 1; |
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175 | close_keyboard(); |
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176 | printf("\n\n"); |
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177 | exit(0); |
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178 | } |
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179 | } |
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180 | |
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181 | // Finally the real thing. This function-call results in 2000 |
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182 | // conversions on the specified channel with the results going into |
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183 | // a buffer called "values". |
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184 | |
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185 | adc_convert_single_repeated(channel,2000,values); |
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186 | |
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187 | if(mio_error_code) |
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188 | { |
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189 | printf("\nError occured - %s\n",mio_error_string); |
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190 | exit(1); |
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191 | } |
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192 | |
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193 | // Bump up the count |
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194 | |
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195 | ; count += 2000; |
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196 | |
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197 | // Now we'll read out the 2000 conversion values. Convert them to |
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198 | // floating point voltages and set the min and max values as appropriate |
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199 | |
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200 | for(x=0; x<2000; x++) |
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201 | { |
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202 | result = values[x]; |
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203 | |
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204 | current = adc_convert_to_volts(channel,result); |
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205 | |
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206 | // Check and load the min/max values as needed |
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207 | |
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208 | if(current < min) |
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209 | min = current; |
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210 | |
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211 | if(current > max) |
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212 | max = current; |
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213 | |
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214 | // Print the values |
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215 | |
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216 | printf("CH %02d %09ld %9.5f Min =%9.5f Max =%9.5f\r",channel,count,current,min,max); |
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217 | } |
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218 | } |
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219 | |
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220 | |
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221 | return 0; |
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222 | } |
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223 | |
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224 | |
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225 | |
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226 | void *thread_function(void *arg) |
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227 | { |
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228 | int c; |
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229 | |
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230 | while(1) |
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231 | { |
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232 | pthread_testcancel(); |
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233 | |
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234 | if(exit_flag) |
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235 | break; |
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236 | |
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237 | /* This call will put THIS process to sleep until either an |
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238 | interrupt occurs or a terminating signal is sent by the |
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239 | parent or the system. |
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240 | */ |
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241 | c = wait_adc_int(0); |
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242 | |
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243 | /* We check to see if it was a real interrupt instead of a |
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244 | termination request. |
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245 | */ |
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246 | if(c == 0) |
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247 | { |
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248 | #ifdef DEBUG |
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249 | printf("Interrupt occured on ADC 0\n"); |
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250 | #endif |
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251 | ++count; |
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252 | |
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253 | } |
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254 | else |
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255 | break; |
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256 | } |
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257 | } |
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258 | |
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259 | |
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260 | |
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261 | void *thread_function2(void *arg) |
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262 | { |
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263 | int c; |
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264 | |
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265 | while(1) |
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266 | { |
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267 | pthread_testcancel(); |
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268 | |
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269 | if(exit_flag) |
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270 | break; |
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271 | |
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272 | /* This call will put THIS process to sleep until either an |
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273 | interrupt occurs or a terminating signal is sent by the |
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274 | parent or the system. |
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275 | */ |
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276 | c = wait_adc_int(1); |
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277 | |
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278 | /* We check to see if it was a real interrupt instead of a |
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279 | termination request. |
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280 | */ |
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281 | if(c == 0) |
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282 | { |
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283 | #ifdef DEBUG |
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284 | printf("Interrupt occured on ADC 1\n"); |
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285 | #endif |
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286 | ++count; |
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287 | |
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288 | } |
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289 | else |
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290 | break; |
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291 | } |
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292 | } |
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293 | |
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