1 | >ME:
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2 | can you provide a code example in programming language C, which showcases following scenario:
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3 |
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4 | The state of eight digital Input pins of a microcontroller are read in and afterwards in functions it is detected, if a pin had a rising or falling edge. Each pin is represented by a struct name "Digital_Input". Instances of that struct are hold in an array of type "Digital_Input".
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5 |
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6 | There is a function with the signature "bool PinHasRisingEdge(Digital_Input* pinArr, uint8_t pinSel )"
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7 | As input argutment it gets the reference to the arry of digital inputs and a numeric value selecting the one to operate the functions logic on.
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8 | The locig detects if there is a rising edge. If there is a rising edge the return value is true, else it is false.
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9 |
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10 | There is a function with the signature "bool PinHasFallingEdge(Digital_Input* pinArr, uint8_t pinSel )"
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11 | As input argutment it gets the reference to the arry of digital inputs and a numeric value selecting the one to operate the functions logic on.
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12 | The locig detects if there is a falling edge. If there is a rising edge the return value is true, else it is false.
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13 |
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14 | >>ChatGPT:
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15 | Certainly! Here's an example in C that demonstrates the scenario you described:
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16 |
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17 | #include <stdbool.h>
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18 | #include <stdint.h>
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19 |
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20 | // Define the struct for digital inputs
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21 | typedef struct {
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22 | bool state;
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23 | bool lastState;
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24 | } Digital_Input;
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25 |
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26 | // Function to check if a pin has a rising edge
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27 | bool PinHasRisingEdge(Digital_Input* pinArr, uint8_t pinSel) {
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28 | // Check if the current state is HIGH and the last state was LOW
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29 | if (pinArr[pinSel].state && !pinArr[pinSel].lastState) {
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30 | return true; // Rising edge detected
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31 | } else {
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32 | return false; // No rising edge
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33 | }
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34 | }
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35 |
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36 | // Function to check if a pin has a falling edge
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37 | bool PinHasFallingEdge(Digital_Input* pinArr, uint8_t pinSel) {
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38 | // Check if the current state is LOW and the last state was HIGH
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39 | if (!pinArr[pinSel].state && pinArr[pinSel].lastState) {
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40 | return true; // Falling edge detected
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41 | } else {
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42 | return false; // No falling edge
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43 | }
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44 | }
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45 |
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46 | int main() {
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47 | // Example usage
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48 | Digital_Input inputArray[8]; // Assuming 8 digital inputs
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49 |
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50 | // Simulating a change in state for a specific pin
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51 | uint8_t pinToTest = 3;
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52 | inputArray[pinToTest].state = true;
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53 | inputArray[pinToTest].lastState = false;
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54 |
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55 | // Check for rising edge
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56 | if (PinHasRisingEdge(inputArray, pinToTest)) {
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57 | // Rising edge detected
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58 | // Do something here
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59 | }
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60 |
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61 | // Check for falling edge
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62 | if (PinHasFallingEdge(inputArray, pinToTest)) {
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63 | // Falling edge detected
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64 | // Do something here
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65 | }
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66 |
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67 | return 0;
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68 | }
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69 | This example assumes that you have an array of Digital_Input structures representing the state of each digital input. The PinHasRisingEdge and PinHasFallingEdge functions take the array and the selected pin as parameters and return true if the specified condition is met, otherwise false.
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70 |
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71 | >>Me:
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72 | Great, can you modify the main() function to have it an infinite loop, which reads in a generic 8 bit port, dispatch each bit of the read byte to one element in "Digital_Input", then runs the functions PinHasRisingEdge and PinHasFallingEdge. For each of the functions exists a byte which holds in a bitstuffed fashion the results of the itterative function calls
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73 |
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74 |
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75 | >>ChatGPT:
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76 | Certainly! I've modified the main() function to read in a generic 8-bit port in an infinite loop, dispatch each bit to one element in the Digital_Input array, and then run the PinHasRisingEdge and PinHasFallingEdge functions. I've also added two result bytes to hold the results of the function calls in a bit-stuffed fashion:
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77 |
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78 |
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79 | #include <stdbool.h>
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80 | #include <stdint.h>
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81 | #include <stdio.h>
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82 |
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83 | // Define the struct for digital inputs
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84 | typedef struct {
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85 | bool state;
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86 | bool lastState;
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87 | } Digital_Input;
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88 |
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89 | // Function to check if a pin has a rising edge
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90 | bool PinHasRisingEdge(Digital_Input* pinArr, uint8_t pinSel) {
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91 | // Check if the current state is HIGH and the last state was LOW
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92 | if (pinArr[pinSel].state && !pinArr[pinSel].lastState) {
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93 | return true; // Rising edge detected
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94 | } else {
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95 | return false; // No rising edge
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96 | }
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97 | }
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98 |
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99 | // Function to check if a pin has a falling edge
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100 | bool PinHasFallingEdge(Digital_Input* pinArr, uint8_t pinSel) {
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101 | // Check if the current state is LOW and the last state was HIGH
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102 | if (!pinArr[pinSel].state && pinArr[pinSel].lastState) {
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103 | return true; // Falling edge detected
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104 | } else {
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105 | return false; // No falling edge
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106 | }
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107 | }
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108 |
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109 | int main() {
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110 | Digital_Input inputArray[8]; // Assuming 8 digital inputs
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111 |
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112 | // Result bytes for rising and falling edges
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113 | uint8_t risingEdgeResults = 0;
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114 | uint8_t fallingEdgeResults = 0;
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115 |
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116 | while (1) {
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117 | // Simulate reading from a generic 8-bit port
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118 | uint8_t inputData = 0b11001100;
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119 |
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120 | // Dispatch each bit to one element in Digital_Input
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121 | for (int i = 0; i < 8; ++i) {
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122 | inputArray[i].lastState = inputArray[i].state;
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123 | inputArray[i].state = (inputData >> i) & 0x01;
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124 | }
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125 |
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126 | // Run PinHasRisingEdge and PinHasFallingEdge for each pin
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127 | for (int i = 0; i < 8; ++i) {
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128 | // Update result bytes with the results in a bit-stuffed fashion
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129 | risingEdgeResults |= (PinHasRisingEdge(inputArray, i) ? 1 : 0) << i;
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130 | fallingEdgeResults |= (PinHasFallingEdge(inputArray, i) ? 1 : 0) << i;
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131 | }
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132 |
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133 | // Example: Print the results
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134 | printf("Rising Edge Results: 0x%X\n", risingEdgeResults);
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135 | printf("Falling Edge Results: 0x%X\n", fallingEdgeResults);
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136 | }
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137 |
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138 | return 0;
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139 | }
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140 | This example continuously simulates reading from a generic 8-bit port, updates the state of the Digital_Input array, and runs the edge detection functions for each pin, updating the result bytes accordingly. The results are then printed in a bit-stuffed fashion.
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141 |
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142 | >>Me:
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143 | Can you replace the line "uint8_t inputData = 0b11001100;" with "uint8_t inputData = PORTA;" ?
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144 |
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145 | >>ChatGPT:
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146 | Certainly! If you want to read from a specific 8-bit port, you can replace the line "uint8_t inputData = 0b11001100;" with "uint8_t inputData = PORTA;". Note that "PORTA" should be replaced with the actual port you are using. Here's the modified code:
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147 |
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148 | #include <stdbool.h>
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149 | #include <stdint.h>
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150 | #include <stdio.h>
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151 |
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152 | // Define the struct for digital inputs
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153 | typedef struct {
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154 | bool state;
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155 | bool lastState;
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156 | } Digital_Input;
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157 |
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158 | // Function to check if a pin has a rising edge
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159 | bool PinHasRisingEdge(Digital_Input* pinArr, uint8_t pinSel) {
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160 | // Check if the current state is HIGH and the last state was LOW
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161 | if (pinArr[pinSel].state && !pinArr[pinSel].lastState) {
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162 | return true; // Rising edge detected
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163 | } else {
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164 | return false; // No rising edge
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165 | }
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166 | }
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167 |
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168 | // Function to check if a pin has a falling edge
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169 | bool PinHasFallingEdge(Digital_Input* pinArr, uint8_t pinSel) {
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170 | // Check if the current state is LOW and the last state was HIGH
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171 | if (!pinArr[pinSel].state && pinArr[pinSel].lastState) {
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172 | return true; // Falling edge detected
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173 | } else {
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174 | return false; // No falling edge
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175 | }
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176 | }
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177 |
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178 | int main() {
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179 | Digital_Input inputArray[8]; // Assuming 8 digital inputs
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180 |
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181 | // Result bytes for rising and falling edges
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182 | uint8_t risingEdgeResults = 0;
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183 | uint8_t fallingEdgeResults = 0;
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184 |
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185 | while (1) {
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186 | // Read from the specific 8-bit port (replace PORTA with your actual port)
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187 | uint8_t inputData = PORTA;
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188 |
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189 | // Dispatch each bit to one element in Digital_Input
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190 | for (int i = 0; i < 8; ++i) {
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191 | inputArray[i].lastState = inputArray[i].state;
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192 | inputArray[i].state = (inputData >> i) & 0x01;
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193 | }
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194 |
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195 | // Run PinHasRisingEdge and PinHasFallingEdge for each pin
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196 | for (int i = 0; i < 8; ++i) {
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197 | // Update result bytes with the results in a bit-stuffed fashion
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198 | risingEdgeResults |= (PinHasRisingEdge(inputArray, i) ? 1 : 0) << i;
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199 | fallingEdgeResults |= (PinHasFallingEdge(inputArray, i) ? 1 : 0) << i;
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200 | }
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201 |
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202 | // Example: Print the results
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203 | printf("Rising Edge Results: 0x%X\n", risingEdgeResults);
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204 | printf("Falling Edge Results: 0x%X\n", fallingEdgeResults);
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205 | }
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206 |
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207 | return 0;
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208 | }
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209 | Make sure to replace "PORTA" with the actual port you are using in your microcontroller environment.
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